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    Subject[PATCH 03/19] OpenRISC: Memory management
    Date

    Signed-off-by: Jonas Bonn <jonas@southpole.se>
    ---
    arch/openrisc/include/asm/cache.h | 29 ++
    arch/openrisc/include/asm/fixmap.h | 113 ++++++++
    arch/openrisc/include/asm/memblock.h | 24 ++
    arch/openrisc/include/asm/mmu.h | 26 ++
    arch/openrisc/include/asm/mmu_context.h | 43 +++
    arch/openrisc/include/asm/page.h | 112 ++++++++
    arch/openrisc/include/asm/pgalloc.h | 142 ++++++++++
    arch/openrisc/include/asm/pgtable.h | 449 +++++++++++++++++++++++++++++++
    arch/openrisc/include/asm/tlb.h | 34 +++
    arch/openrisc/include/asm/tlbflush.h | 72 +++++
    arch/openrisc/include/asm/uaccess.h | 385 ++++++++++++++++++++++++++
    arch/openrisc/mm/fault.c | 338 +++++++++++++++++++++++
    arch/openrisc/mm/init.c | 329 ++++++++++++++++++++++
    arch/openrisc/mm/ioremap.c | 112 ++++++++
    arch/openrisc/mm/tlb.c | 198 ++++++++++++++
    15 files changed, 2406 insertions(+), 0 deletions(-)
    create mode 100644 arch/openrisc/include/asm/cache.h
    create mode 100644 arch/openrisc/include/asm/fixmap.h
    create mode 100644 arch/openrisc/include/asm/memblock.h
    create mode 100644 arch/openrisc/include/asm/mmu.h
    create mode 100644 arch/openrisc/include/asm/mmu_context.h
    create mode 100644 arch/openrisc/include/asm/page.h
    create mode 100644 arch/openrisc/include/asm/pgalloc.h
    create mode 100644 arch/openrisc/include/asm/pgtable.h
    create mode 100644 arch/openrisc/include/asm/tlb.h
    create mode 100644 arch/openrisc/include/asm/tlbflush.h
    create mode 100644 arch/openrisc/include/asm/uaccess.h
    create mode 100644 arch/openrisc/mm/fault.c
    create mode 100644 arch/openrisc/mm/init.c
    create mode 100644 arch/openrisc/mm/ioremap.c
    create mode 100644 arch/openrisc/mm/tlb.c

    diff --git a/arch/openrisc/include/asm/cache.h b/arch/openrisc/include/asm/cache.h
    new file mode 100644
    index 0000000..4ce7a01
    --- /dev/null
    +++ b/arch/openrisc/include/asm/cache.h
    @@ -0,0 +1,29 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_CACHE_H
    +#define __ASM_OPENRISC_CACHE_H
    +
    +/* FIXME: How can we replace these with values from the CPU...
    + * they shouldn't be hard-coded!
    + */
    +
    +#define L1_CACHE_BYTES 16
    +#define L1_CACHE_SHIFT 4
    +
    +#endif /* __ASM_OPENRISC_CACHE_H */
    diff --git a/arch/openrisc/include/asm/fixmap.h b/arch/openrisc/include/asm/fixmap.h
    new file mode 100644
    index 0000000..328fc12
    --- /dev/null
    +++ b/arch/openrisc/include/asm/fixmap.h
    @@ -0,0 +1,113 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_FIXMAP_H
    +#define __ASM_OPENRISC_FIXMAP_H
    +
    +/* Why exactly do we need 2 empty pages between the top of the fixed
    + * addresses and the top of virtual memory? Something is using that
    + * memory space but not sure what right now... If you find it, leave
    + * a comment here.
    + */
    +#define FIXADDR_TOP ((unsigned long) (-2*PAGE_SIZE))
    +
    +#include <linux/kernel.h>
    +#include <linux/threads.h>
    +#include <asm/page.h>
    +
    +/*
    + * Here we define all the compile-time 'special' virtual
    + * addresses. The point is to have a constant address at
    + * compile time, but to set the physical address only
    + * in the boot process. We allocate these special addresses
    + * from the end of virtual memory (0xffffb000) backwards.
    + *
    + * Also this would let us do fail-safe vmalloc(), we
    + * can guarantee that these special addresses and
    + * vmalloc()-ed addresses never overlap. We don't actually
    + * do this on OpenRISC though (nor do most other arch's).
    + *
    + * these 'compile-time allocated' memory buffers are
    + * fixed-size (PAGE_SIZE) pages. (or larger if used with an increment
    + * highger than 1) use fixmap_set(idx,phys) to associate
    + * physical memory with fixmap indices.
    + *
    + * TLB entries of such buffers will not be flushed across
    + * task switches.
    + */
    +enum fixed_addresses {
    + /*
    + * FIX_IOREMAP entries are useful for mapping physical address
    + * space before ioremap() is useable, e.g. really early in boot
    + * before kmalloc() is working.
    + */
    +#define FIX_N_IOREMAPS 32
    + FIX_IOREMAP_BEGIN,
    + FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1,
    + __end_of_fixed_addresses
    +};
    +
    +extern void __set_fixmap(enum fixed_addresses idx,
    + unsigned long phys, pgprot_t flags);
    +
    +#define set_fixmap(idx, phys) \
    + __set_fixmap(idx, phys, PAGE_KERNEL)
    +/*
    + * Some hardware wants to get fixmapped without caching.
    + */
    +#define set_fixmap_nocache(idx, phys) \
    + __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
    +
    +#define clear_fixmap(idx) \
    + __set_fixmap(idx, 0, __pgprot(0))
    +
    +#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
    +#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
    +
    +#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
    +#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
    +
    +/*
    + * 'index to address' translation. If anyone tries to use the idx
    + * directly without tranlation, we catch the bug with a NULL-deference
    + * kernel oops. Illegal ranges of incoming indices are caught too.
    + */
    +static __always_inline unsigned long fix_to_virt(const unsigned int idx)
    +{
    + /*
    + * this branch gets completely eliminated after inlining,
    + * except when someone tries to use fixaddr indices in an
    + * illegal way. (such as mixing up address types or using
    + * out-of-range indices).
    + *
    + * If it doesn't get removed, the linker will complain
    + * loudly with a reasonably clear error message..
    + */
    + if (idx >= __end_of_fixed_addresses)
    + BUG();
    +
    + return __fix_to_virt(idx);
    +}
    +
    +static inline unsigned long virt_to_fix(const unsigned long vaddr)
    +{
    + BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
    + return __virt_to_fix(vaddr);
    +}
    +
    +#endif
    diff --git a/arch/openrisc/include/asm/memblock.h b/arch/openrisc/include/asm/memblock.h
    new file mode 100644
    index 0000000..bbe5a1c
    --- /dev/null
    +++ b/arch/openrisc/include/asm/memblock.h
    @@ -0,0 +1,24 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_MEMBLOCK_H
    +#define __ASM_OPENRISC_MEMBLOCK_H
    +
    +/* empty */
    +
    +#endif /* __ASM_OPENRISC_MEMBLOCK_H */
    diff --git a/arch/openrisc/include/asm/mmu.h b/arch/openrisc/include/asm/mmu.h
    new file mode 100644
    index 0000000..d069bc2
    --- /dev/null
    +++ b/arch/openrisc/include/asm/mmu.h
    @@ -0,0 +1,26 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_MMU_H
    +#define __ASM_OPENRISC_MMU_H
    +
    +#ifndef __ASSEMBLY__
    +typedef unsigned long mm_context_t;
    +#endif
    +
    +#endif
    diff --git a/arch/openrisc/include/asm/mmu_context.h b/arch/openrisc/include/asm/mmu_context.h
    new file mode 100644
    index 0000000..a823716
    --- /dev/null
    +++ b/arch/openrisc/include/asm/mmu_context.h
    @@ -0,0 +1,43 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_MMU_CONTEXT_H
    +#define __ASM_OPENRISC_MMU_CONTEXT_H
    +
    +#include <asm-generic/mm_hooks.h>
    +
    +extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
    +extern void destroy_context(struct mm_struct *mm);
    +extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
    + struct task_struct *tsk);
    +
    +#define deactivate_mm(tsk,mm) do { } while (0)
    +
    +#define activate_mm(prev,next) switch_mm((prev),(next),NULL)
    +
    +/* current active pgd - this is similar to other processors pgd
    + * registers like cr3 on the i386
    + */
    +
    +extern volatile pgd_t *current_pgd; /* defined in arch/openrisc/mm/fault.c */
    +
    +static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
    +{
    +}
    +
    +#endif
    diff --git a/arch/openrisc/include/asm/page.h b/arch/openrisc/include/asm/page.h
    new file mode 100644
    index 0000000..037b844
    --- /dev/null
    +++ b/arch/openrisc/include/asm/page.h
    @@ -0,0 +1,112 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_PAGE_H
    +#define __ASM_OPENRISC_PAGE_H
    +
    +
    +/* PAGE_SHIFT determines the page size */
    +
    +#define PAGE_SHIFT 13
    +#ifdef __ASSEMBLY__
    +#define PAGE_SIZE (1 << PAGE_SHIFT)
    +#else
    +#define PAGE_SIZE (1UL << PAGE_SHIFT)
    +#endif
    +#define PAGE_MASK (~(PAGE_SIZE-1))
    +
    +#define PAGE_OFFSET 0xc0000000
    +#define KERNELBASE PAGE_OFFSET
    +
    +/* #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) */
    +
    +/* This is not necessarily the right place for this, but it's needed by
    + * drivers/of/fdt.c
    + */
    +#include <asm/setup.h>
    +
    +#ifndef __ASSEMBLY__
    +
    +#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
    +#define free_user_page(page, addr) free_page(addr)
    +
    +#define clear_page(page) memset((page), 0, PAGE_SIZE)
    +#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
    +
    +#define clear_user_page(page, vaddr, pg) clear_page(page)
    +#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
    +
    +/*
    + * These are used to make use of C type-checking..
    + */
    +typedef struct {
    + unsigned long pte;
    +} pte_t;
    +typedef struct {
    + unsigned long pgd;
    +} pgd_t;
    +typedef struct {
    + unsigned long pgprot;
    +} pgprot_t;
    +typedef struct page *pgtable_t;
    +
    +#define pte_val(x) ((x).pte)
    +#define pgd_val(x) ((x).pgd)
    +#define pgprot_val(x) ((x).pgprot)
    +
    +#define __pte(x) ((pte_t) { (x) } )
    +#define __pgd(x) ((pgd_t) { (x) } )
    +#define __pgprot(x) ((pgprot_t) { (x) } )
    +
    +extern unsigned long memory_start;
    +extern unsigned long memory_end;
    +
    +#endif /* !__ASSEMBLY__ */
    +
    +
    +#ifndef __ASSEMBLY__
    +
    +/* from linker script */
    +
    +#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
    +#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
    +
    +#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
    +#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
    +
    +#define virt_to_page(addr) (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
    +#define page_to_virt(page) ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
    +
    +#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
    +
    +#define pfn_valid(pfn) ((pfn) < max_mapnr)
    +
    +#define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
    + ((void *)(kaddr) < (void *)memory_end))
    +
    +#endif /* __ASSEMBLY__ */
    +
    +
    +#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
    + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
    +
    +
    +#include <asm-generic/memory_model.h>
    +#include <asm-generic/getorder.h>
    +
    +#endif /* __ASM_OPENRISC_PAGE_H */
    diff --git a/arch/openrisc/include/asm/pgalloc.h b/arch/openrisc/include/asm/pgalloc.h
    new file mode 100644
    index 0000000..339bb52
    --- /dev/null
    +++ b/arch/openrisc/include/asm/pgalloc.h
    @@ -0,0 +1,142 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_PGALLOC_H
    +#define __ASM_OPENRISC_PGALLOC_H
    +
    +#include <asm/page.h>
    +#include <linux/threads.h>
    +#include <linux/mm.h>
    +#include <linux/memblock.h>
    +#include <linux/bootmem.h>
    +
    +extern int mem_init_done;
    +
    +#if 1
    +#define pmd_populate_kernel(mm, pmd, pte) \
    + set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
    +
    +static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
    +{
    + set_pmd(pmd, __pmd(_KERNPG_TABLE +
    + ((unsigned long)page_to_pfn(pte) <<
    + (unsigned long) PAGE_SHIFT)));
    +}
    +#endif
    +
    +#if 0
    +#define pmd_populate_kernel(mm, pmd, pte) \
    + set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
    +#define pmd_populate(mm, pmd, pte) \
    + set_pmd(pmd, __pmd(__pa(pte)))
    +
    +#endif
    +
    +#if 0
    +/* __PHX__ check */
    +#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, pte)
    +#define pmd_populate(mm, pmd, pte) pmd_set(pmd, page_address(pte))
    +#endif
    +
    +
    +#if 1
    +/*
    + * Allocate and free page tables.
    + */
    +
    +static inline pgd_t *pgd_alloc(struct mm_struct *mm)
    +{
    + pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
    +
    + if (ret) {
    + memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
    + memcpy(ret + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,
    + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
    +
    + }
    + return ret;
    +}
    +#endif
    +
    +#if 0
    +/* __PHX__ check, this is supposed to be 2.6 style, but
    + * we use current_pgd (from mm->pgd) to load kernel pages
    + * so we need it initialized.
    + */
    +extern inline pgd_t *pgd_alloc (struct mm_struct *mm)
    +{
    + return (pgd_t *)get_zeroed_page(GFP_KERNEL);
    +}
    +#endif
    +
    +static inline void pgd_free (struct mm_struct *mm, pgd_t *pgd)
    +{
    + free_page((unsigned long)pgd);
    +}
    +
    +/**
    + * OK, this one's a bit tricky... ioremap can get called before memory is
    + * initialized (early serial console does this) and will want to alloc a page
    + * for its mapping. No userspace pages will ever get allocated before memory
    + * is initialized so this applies only to kernel pages. In the event that
    + * this is called before memory is initialized we allocate the page using
    + * the memblock infrastructure.
    + */
    +
    +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
    +{
    + pte_t* pte;
    +
    + if (likely(mem_init_done)) {
    + pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
    + } else {
    + pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
    +// pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
    + }
    +
    + if (pte)
    + clear_page(pte);
    + return pte;
    +}
    +
    +static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
    +{
    + struct page *pte;
    + pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
    + if (pte)
    + clear_page(page_address(pte));
    + return pte;
    +}
    +
    +static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
    +{
    + free_page((unsigned long)pte);
    +}
    +
    +static inline void pte_free(struct mm_struct *mm, struct page *pte)
    +{
    + __free_page(pte);
    +}
    +
    +
    +#define __pte_free_tlb(tlb,pte,addr) tlb_remove_page((tlb),(pte))
    +#define pmd_pgtable(pmd) pmd_page(pmd)
    +
    +#define check_pgt_cache() do { } while (0)
    +
    +#endif
    diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
    new file mode 100644
    index 0000000..3d5792a
    --- /dev/null
    +++ b/arch/openrisc/include/asm/pgtable.h
    @@ -0,0 +1,449 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +/* or32 pgtable.h - macros and functions to manipulate page tables
    + *
    + * Based on:
    + * include/asm-cris/pgtable.h
    + */
    +
    +#ifndef __ASM_OPENRISC_PGTABLE_H
    +#define __ASM_OPENRISC_PGTABLE_H
    +
    +//#include <asm-generic/4level-fixup.h>
    +#include <asm-generic/pgtable-nopmd.h>
    +
    +#ifndef __ASSEMBLY__
    +#include <asm/mmu.h>
    +#include <asm/fixmap.h>
    +
    +/*
    + * The Linux memory management assumes a three-level page table setup. On
    + * or32, we use that, but "fold" the mid level into the top-level page
    + * table. Since the MMU TLB is software loaded through an interrupt, it
    + * supports any page table structure, so we could have used a three-level
    + * setup, but for the amounts of memory we normally use, a two-level is
    + * probably more efficient.
    + *
    + * This file contains the functions and defines necessary to modify and use
    + * the or32 page table tree.
    + */
    +
    +extern void paging_init(void);
    +
    +/* Certain architectures need to do special things when pte's
    + * within a page table are directly modified. Thus, the following
    + * hook is made available.
    + */
    +#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
    +#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
    +/*
    + * (pmds are folded into pgds so this doesn't get actually called,
    + * but the define is needed for a generic inline function.)
    + */
    +#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
    +
    +#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-2))
    +#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
    +#define PGDIR_MASK (~(PGDIR_SIZE-1))
    +
    +/*
    + * entries per page directory level: we use a two-level, so
    + * we don't really have any PMD directory physically.
    + * pointers are 4 bytes so we can use the page size and
    + * divide it by 4 (shift by 2).
    + */
    +#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-2))
    +
    +#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-2))
    +
    +/* calculate how many PGD entries a user-level program can use
    + * the first mappable virtual address is 0
    + * (TASK_SIZE is the maximum virtual address space)
    + */
    +
    +#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
    +#define FIRST_USER_ADDRESS 0
    +
    +/*
    + * Kernels own virtual memory area.
    + */
    +
    +/*
    + * The size and location of the vmalloc area are chosen so that modules
    + * placed in this area aren't more than a 28-bit signed offset from any
    + * kernel functions that they may need. This greatly simplifies handling
    + * of the relocations for l.j and l.jal instructions as we don't need to
    + * introduce any trampolines for reaching "distant" code.
    + *
    + * 64 MB of vmalloc area is comparable to what's available on other arches.
    + */
    +
    +#define VMALLOC_START (PAGE_OFFSET-0x04000000)
    +#define VMALLOC_END (PAGE_OFFSET)
    +#define VMALLOC_VMADDR(x) ((unsigned long)(x))
    +
    +/* Define some higher level generic page attributes.
    + *
    + * If you change _PAGE_CI definition be sure to change it in
    + * io.h for ioremap_nocache() too.
    + */
    +
    +/*
    + * An OR32 PTE looks like this:
    + *
    + * | 31 ... 10 | 9 | 8 ... 6 | 5 | 4 | 3 | 2 | 1 | 0 |
    + * Phys pg.num L PP Index D A WOM WBC CI CC
    + *
    + * L : link
    + * PPI: Page protection index
    + * D : Dirty
    + * A : Accessed
    + * WOM: Weakly ordered memory
    + * WBC: Write-back cache
    + * CI : Cache inhibit
    + * CC : Cache coherent
    + *
    + * The protection bits below should correspond to the layout of the actual
    + * PTE as per above
    + */
    +
    +#define _PAGE_CC 0x001 /* software: pte contains a translation */
    +#define _PAGE_CI 0x002 /* cache inhibit */
    +#define _PAGE_WBC 0x004 /* write back cache */
    +#define _PAGE_FILE 0x004 /* set: pagecache, unset: swap (when !PRESENT) */
    +#define _PAGE_WOM 0x008 /* weakly ordered memory */
    +
    +#define _PAGE_A 0x010 /* accessed */
    +#define _PAGE_D 0x020 /* dirty */
    +#define _PAGE_URE 0x040 /* user read enable */
    +#define _PAGE_UWE 0x080 /* user write enable */
    +
    +#define _PAGE_SRE 0x100 /* superuser read enable */
    +#define _PAGE_SWE 0x200 /* superuser write enable */
    +#define _PAGE_EXEC 0x400 /* software: page is executable */
    +#define _PAGE_U_SHARED 0x800 /* software: page is shared in user space */
    +
    +/* 0x001 is cache coherency bit, which should always be set to
    + * 1 - for SMP (when we support it)
    + * 0 - otherwise
    + *
    + * we just reuse this bit in software for _PAGE_PRESENT and
    + * force it to 0 when loading it into TLB.
    + */
    +#define _PAGE_PRESENT _PAGE_CC
    +#define _PAGE_USER _PAGE_URE
    +#define _PAGE_WRITE (_PAGE_UWE | _PAGE_SWE)
    +#define _PAGE_DIRTY _PAGE_D
    +#define _PAGE_ACCESSED _PAGE_A
    +#define _PAGE_NO_CACHE _PAGE_CI
    +#define _PAGE_SHARED _PAGE_U_SHARED
    +#define _PAGE_READ (_PAGE_URE | _PAGE_SRE)
    +
    +#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
    +#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
    +#define _PAGE_ALL (_PAGE_PRESENT | _PAGE_ACCESSED)
    +#define _KERNPG_TABLE (_PAGE_BASE | _PAGE_SRE | _PAGE_SWE | _PAGE_ACCESSED | _PAGE_DIRTY)
    +
    +#define PAGE_NONE __pgprot(_PAGE_ALL)
    +#define PAGE_READONLY __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE )
    +#define PAGE_READONLY_X __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_EXEC)
    +#define PAGE_SHARED __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_UWE | _PAGE_SWE | _PAGE_SHARED)
    +#define PAGE_SHARED_X __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_UWE | _PAGE_SWE | _PAGE_SHARED | _PAGE_EXEC)
    +#define PAGE_COPY __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE )
    +#define PAGE_COPY_X __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_EXEC)
    +
    +#define PAGE_KERNEL __pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE | _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC)
    +#define PAGE_KERNEL_RO __pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC)
    +#define PAGE_KERNEL_NOCACHE __pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE | _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC | _PAGE_CI)
    +
    +#define __P000 PAGE_NONE
    +#define __P001 PAGE_READONLY_X
    +#define __P010 PAGE_COPY
    +#define __P011 PAGE_COPY_X
    +#define __P100 PAGE_READONLY
    +#define __P101 PAGE_READONLY_X
    +#define __P110 PAGE_COPY
    +#define __P111 PAGE_COPY_X
    +
    +#define __S000 PAGE_NONE
    +#define __S001 PAGE_READONLY_X
    +#define __S010 PAGE_SHARED
    +#define __S011 PAGE_SHARED_X
    +#define __S100 PAGE_READONLY
    +#define __S101 PAGE_READONLY_X
    +#define __S110 PAGE_SHARED
    +#define __S111 PAGE_SHARED_X
    +
    +/* zero page used for uninitialized stuff */
    +extern unsigned long empty_zero_page[2048];
    +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
    +
    +/* number of bits that fit into a memory pointer */
    +#define BITS_PER_PTR (8*sizeof(unsigned long))
    +
    +/* to align the pointer to a pointer address */
    +#define PTR_MASK (~(sizeof(void*)-1))
    +
    +/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
    +/* 64-bit machines, beware! SRB. */
    +#define SIZEOF_PTR_LOG2 2
    +
    +/* to find an entry in a page-table */
    +#define PAGE_PTR(address) \
    +((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
    +
    +/* to set the page-dir */
    +#define SET_PAGE_DIR(tsk,pgdir)
    +
    +#define pte_none(x) (!pte_val(x))
    +#define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
    +#define pte_clear(mm,addr,xp) do { pte_val(*(xp)) = 0; } while (0)
    +
    +#define pmd_none(x) (!pmd_val(x))
    +#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK)) != _KERNPG_TABLE)
    +#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
    +#define pmd_clear(xp) do { pmd_val(*(xp)) = 0; } while (0)
    +
    +/*
    + * The following only work if pte_present() is true.
    + * Undefined behaviour if not..
    + */
    +
    +static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
    +static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
    +static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; }
    +static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
    +static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
    +static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
    +static inline int pte_special(pte_t pte) { return 0; }
    +static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
    +
    +static inline pte_t pte_wrprotect(pte_t pte)
    +{
    + pte_val(pte) &= ~(_PAGE_WRITE);
    + return pte;
    +}
    +
    +static inline pte_t pte_rdprotect(pte_t pte)
    +{
    + pte_val(pte) &= ~(_PAGE_READ);
    + return pte;
    +}
    +
    +static inline pte_t pte_exprotect(pte_t pte)
    +{
    + pte_val(pte) &= ~(_PAGE_EXEC);
    + return pte;
    +}
    +
    +static inline pte_t pte_mkclean(pte_t pte)
    +{
    + pte_val(pte) &= ~(_PAGE_DIRTY);
    + return pte;
    +}
    +
    +static inline pte_t pte_mkold(pte_t pte)
    +{
    + pte_val(pte) &= ~(_PAGE_ACCESSED);
    + return pte;
    +}
    +
    +static inline pte_t pte_mkwrite(pte_t pte)
    +{
    + pte_val(pte) |= _PAGE_WRITE;
    + return pte;
    +}
    +
    +static inline pte_t pte_mkread(pte_t pte)
    +{
    + pte_val(pte) |= _PAGE_READ;
    + return pte;
    +}
    +
    +static inline pte_t pte_mkexec(pte_t pte)
    +{
    + pte_val(pte) |= _PAGE_EXEC;
    + return pte;
    +}
    +
    +static inline pte_t pte_mkdirty(pte_t pte)
    +{
    + pte_val(pte) |= _PAGE_DIRTY;
    + return pte;
    +}
    +
    +static inline pte_t pte_mkyoung(pte_t pte)
    +{
    + pte_val(pte) |= _PAGE_ACCESSED;
    + return pte;
    +}
    +
    +/*
    + * Conversion functions: convert a page and protection to a page entry,
    + * and a page entry and page directory to the page they refer to.
    + */
    +
    +/* What actually goes as arguments to the various functions is less than
    + * obvious, but a rule of thumb is that struct page's goes as struct page *,
    + * really physical DRAM addresses are unsigned long's, and DRAM "virtual"
    + * addresses (the 0xc0xxxxxx's) goes as void *'s.
    + */
    +
    +static inline pte_t __mk_pte(void * page, pgprot_t pgprot)
    +{
    + pte_t pte;
    + /* the PTE needs a physical address */
    + pte_val(pte) = __pa(page) | pgprot_val(pgprot);
    + return pte;
    +}
    +
    +#define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
    +
    +#define mk_pte_phys(physpage, pgprot) \
    +({ \
    + pte_t __pte; \
    + \
    + pte_val(__pte) = (physpage) + pgprot_val(pgprot); \
    + __pte; \
    +})
    +
    +static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
    +{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
    +
    +
    +/* pte_val refers to a page in the 0x0xxxxxxx physical DRAM interval
    + * __pte_page(pte_val) refers to the "virtual" DRAM interval
    + * pte_pagenr refers to the page-number counted starting from the virtual DRAM start
    + */
    +
    +static inline unsigned long __pte_page(pte_t pte)
    +{
    + /* the PTE contains a physical address */
    + return (unsigned long)__va(pte_val(pte) & PAGE_MASK);
    +}
    +
    +#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
    +
    +/* permanent address of a page */
    +
    +#define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
    +#define pte_page(pte) (mem_map+pte_pagenr(pte))
    +
    +/* only the pte's themselves need to point to physical DRAM (see above)
    + * the pagetable links are purely handled within the kernel SW and thus
    + * don't need the __pa and __va transformations.
    + */
    +
    +extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
    +{ pmd_val(*pmdp) = _KERNPG_TABLE | (unsigned long) ptep; }
    +
    +#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
    +#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
    +
    +/* to find an entry in a page-table-directory. */
    +#define pgd_index(address) ((address >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
    +
    +#define __pgd_offset(address) pgd_index(address)
    +
    +#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
    +
    +/* to find an entry in a kernel page-table-directory */
    +#define pgd_offset_k(address) pgd_offset(&init_mm, address)
    +
    +#define __pmd_offset(address) \
    + (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
    +
    +/*
    + * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
    + *
    + * this macro returns the index of the entry in the pte page which would
    + * control the given virtual address
    + */
    +#define __pte_offset(address) \
    + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
    +#define pte_offset_kernel(dir, address) \
    + ((pte_t *) pmd_page_kernel(*(dir)) + __pte_offset(address))
    +#define pte_offset_map(dir, address) \
    + ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
    +#define pte_offset_map_nested(dir, address) \
    + pte_offset_map(dir, address)
    +
    +#define pte_unmap(pte) do { } while (0)
    +#define pte_unmap_nested(pte) do { } while (0)
    +#define pte_pfn(x) ((unsigned long)(((x).pte)) >> PAGE_SHIFT)
    +#define pfn_pte(pfn, prot) __pte((((pfn) << PAGE_SHIFT)) | pgprot_val(prot))
    +
    +#define pte_ERROR(e) \
    + printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
    +#define pgd_ERROR(e) \
    + printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
    +
    +extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* defined in head.S */
    +
    +/*
    + * or32 doesn't have any external MMU info: the kernel page
    + * tables contain all the necessary information.
    + *
    + * Actually I am not sure on what this could be used for.
    + */
    +static inline void update_mmu_cache(struct vm_area_struct * vma,
    + unsigned long address, pte_t * pte)
    +{
    +}
    +
    +/* __PHX__ FIXME, SWAP, this probably doesn't work */
    +
    +/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
    +/* Since the PAGE_PRESENT bit is bit 4, we can use the bits above */
    +
    +#define __swp_type(x) (((x).val >> 5) & 0x7f)
    +#define __swp_offset(x) ((x).val >> 12)
    +#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 5) | ((offset) << 12) })
    +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
    +#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
    +
    +/* Encode and decode a nonlinear file mapping entry */
    +
    +#define PTE_FILE_MAX_BITS 26
    +#define pte_to_pgoff(x) (pte_val(x) >> 6)
    +#define pgoff_to_pte(x) __pte(((x) << 6) | _PAGE_FILE)
    +
    +#define kern_addr_valid(addr) (1)
    +
    +#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
    + remap_pfn_range(vma, vaddr, pfn, size, prot)
    +
    +#include <asm-generic/pgtable.h>
    +
    +void *consistent_alloc(int gfp, size_t size, dma_addr_t *dma_handle);
    +void consistent_free(void *vaddr);
    +void consistent_sync(void *vaddr, size_t size, int direction);
    +void consistent_sync_page(struct page *page, unsigned long offset,
    + size_t size, int direction);
    +
    +/*
    + * No page table caches to initialise
    + */
    +#define pgtable_cache_init() do { } while (0)
    +#define io_remap_page_range remap_page_range
    +
    +typedef pte_t *pte_addr_t;
    +
    +#endif /* __ASSEMBLY__ */
    +#endif /* __ASM_OPENRISC_PGTABLE_H */
    diff --git a/arch/openrisc/include/asm/tlb.h b/arch/openrisc/include/asm/tlb.h
    new file mode 100644
    index 0000000..fa4376a
    --- /dev/null
    +++ b/arch/openrisc/include/asm/tlb.h
    @@ -0,0 +1,34 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_TLB_H__
    +#define __ASM_OPENRISC_TLB_H__
    +
    +/*
    + * or32 doesn't need any special per-pte or
    + * per-vma handling..
    + */
    +#define tlb_start_vma(tlb, vma) do { } while (0)
    +#define tlb_end_vma(tlb, vma) do { } while (0)
    +#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
    +
    +#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
    +#include <linux/pagemap.h>
    +#include <asm-generic/tlb.h>
    +
    +#endif /* __ASM_OPENRISC_TLB_H__ */
    diff --git a/arch/openrisc/include/asm/tlbflush.h b/arch/openrisc/include/asm/tlbflush.h
    new file mode 100644
    index 0000000..91adaf9
    --- /dev/null
    +++ b/arch/openrisc/include/asm/tlbflush.h
    @@ -0,0 +1,72 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_TLBFLUSH_H
    +#define __ASM_OPENRISC_TLBFLUSH_H
    +
    +#include <linux/mm.h>
    +#include <asm/processor.h>
    +#include <asm/pgtable.h>
    +#include <asm/pgalloc.h>
    +#include <asm/current.h>
    +/*#include <asm/spr_defs.h>*/
    +#include <linux/sched.h>
    +
    +/*
    + * TLB flushing (implemented in arch/or32/mm/tlb.c):
    + *
    + * - flush_tlb() flushes the current mm struct TLBs
    + * - flush_tlb_all() flushes all processes TLBs
    + * - flush_tlb_mm(mm) flushes the specified mm context TLB's
    + * - flush_tlb_page(vma, vmaddr) flushes one page
    + * - flush_tlb_range(mm, start, end) flushes a range of pages
    + *
    + */
    +
    +void flush_tlb_all(void);
    +void flush_tlb_mm(struct mm_struct* mm);
    +void flush_tlb_page(struct vm_area_struct* vma, unsigned long addr);
    +void flush_tlb_range(struct vm_area_struct* vma,
    + unsigned long start,
    + unsigned long end);
    +
    +
    +#if 0
    +static inline void flush_tlb_pgtables(struct mm_struct *mm,
    + unsigned long start, unsigned long end)
    +{
    + /* OR32 does not keep any page table caches in TLB */
    +}
    +
    +#endif
    +
    +static inline void flush_tlb(void)
    +{
    + flush_tlb_mm(current->mm);
    +}
    +
    +static inline void flush_tlb_kernel_range(unsigned long start,
    + unsigned long end)
    +{
    + flush_tlb_range(NULL, start, end);
    +}
    +
    +
    +
    +
    +#endif /* __ASM_OPENRISC_TLBFLUSH_H */
    diff --git a/arch/openrisc/include/asm/uaccess.h b/arch/openrisc/include/asm/uaccess.h
    new file mode 100644
    index 0000000..a163341
    --- /dev/null
    +++ b/arch/openrisc/include/asm/uaccess.h
    @@ -0,0 +1,385 @@
    +/*
    + * OpenRISC Linux
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * OpenRISC implementation:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + * et al.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#ifndef __ASM_OPENRISC_UACCESS_H
    +#define __ASM_OPENRISC_UACCESS_H
    +
    +/*
    + * User space memory access functions
    + */
    +#include <linux/errno.h>
    +#include <linux/thread_info.h>
    +#include <linux/prefetch.h>
    +#include <linux/string.h>
    +#include <asm/page.h>
    +#include <asm/thread_info.h>
    +
    +#define VERIFY_READ 0
    +#define VERIFY_WRITE 1
    +
    +/*
    + * The fs value determines whether argument validity checking should be
    + * performed or not. If get_fs() == USER_DS, checking is performed, with
    + * get_fs() == KERNEL_DS, checking is bypassed.
    + *
    + * For historical reasons, these macros are grossly misnamed.
    + */
    +
    +//#define MAKE_MM_SEG(s) ((mm_segment_t) s)
    +
    +/* addr_limit is the maximum accessible address for the task. we misuse
    + * the KERNEL_DS and USER_DS values to both assign and compare the
    + * addr_limit values through the equally misnamed get/set_fs macros.
    + * (see above)
    + */
    +
    +#define KERNEL_DS (~0UL)
    +#define get_ds() (KERNEL_DS)
    +
    +#define USER_DS (TASK_SIZE)
    +#define get_fs() (current_thread_info()->addr_limit)
    +#define set_fs(x) (current_thread_info()->addr_limit = (x))
    +
    +#define segment_eq(a,b) ((a) == (b))
    +
    +#if 0
    +
    +#define __kernel_ok (segment_eq(get_fs(), KERNEL_DS))
    +#define __user_ok(addr,size) (((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
    +#endif
    +
    +/* Ensure that the range from addr to addr+size is all within the process'
    + * address space
    + */
    +//#define __range_ok(addr,size) (size <= TASK_SIZE && addr <= (TASK_SIZE-size))
    +#define __range_ok(addr,size) (size <= get_fs() && addr <= (get_fs()-size))
    +
    +/* Ensure that addr is below task's addr_limit */
    +#define __addr_ok(addr) ((unsigned long) addr < get_fs())
    +
    +//#define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size)))
    +//#define __access_ok(addr,size) (__range_ok(addr,size))
    +//#define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size))
    +#define access_ok(type,addr,size) __range_ok((unsigned long)addr,(unsigned long)size)
    +
    +
    +/*
    + * The exception table consists of pairs of addresses: the first is the
    + * address of an instruction that is allowed to fault, and the second is
    + * the address at which the program should continue. No registers are
    + * modified, so it is entirely up to the continuation code to figure out
    + * what to do.
    + *
    + * All the routines below use bits of fixup code that are out of line
    + * with the main instruction path. This means when everything is well,
    + * we don't even have to jump over them. Further, they do not intrude
    + * on our cache or tlb entries.
    + */
    +
    +struct exception_table_entry
    +{
    + unsigned long insn, fixup;
    +};
    +
    +/* Returns 0 if exception not found and fixup otherwise. */
    +extern unsigned long search_exception_table(unsigned long);
    +extern void sort_exception_table(void);
    +
    +/*
    + * These are the main single-value transfer routines. They automatically
    + * use the right size if we just have the right pointer type.
    + *
    + * This gets kind of ugly. We want to return _two_ values in "get_user()"
    + * and yet we don't want to do any pointers, because that is too much
    + * of a performance impact. Thus we have a few rather ugly macros here,
    + * and hide all the uglyness from the user.
    + *
    + * The "__xxx" versions of the user access functions are versions that
    + * do not verify the address space, that must have been done previously
    + * with a separate "access_ok()" call (this is used when we do multiple
    + * accesses to the same area of user memory).
    + *
    + * As we use the same address space for kernel and user data on the
    + * PowerPC, we can just do these as direct assignments. (Of course, the
    + * exception handling means that it's no longer "just"...)
    + */
    +#define get_user(x,ptr) \
    + __get_user_check((x),(ptr),sizeof(*(ptr)))
    +#define put_user(x,ptr) \
    + __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
    +
    +#define __get_user(x,ptr) \
    + __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
    +#define __put_user(x,ptr) \
    + __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
    +
    +extern long __put_user_bad(void);
    +
    +#define __put_user_nocheck(x,ptr,size) \
    +({ \
    + long __pu_err; \
    + __put_user_size((x),(ptr),(size),__pu_err); \
    + __pu_err; \
    +})
    +
    +#define __put_user_check(x,ptr,size) \
    +({ \
    + long __pu_err = -EFAULT; \
    + __typeof__(*(ptr)) *__pu_addr = (ptr); \
    + if (access_ok(VERIFY_WRITE,__pu_addr,size)) \
    + __put_user_size((x),__pu_addr,(size),__pu_err); \
    + __pu_err; \
    +})
    +
    +#define __put_user_size(x,ptr,size,retval) \
    +do { \
    + retval = 0; \
    + switch (size) { \
    + case 1: __put_user_asm(x,ptr,retval,"l.sb"); break; \
    + case 2: __put_user_asm(x,ptr,retval,"l.sh"); break; \
    + case 4: __put_user_asm(x,ptr,retval,"l.sw"); break; \
    + case 8: __put_user_asm2(x,ptr,retval); break; \
    + default: __put_user_bad(); \
    + } \
    +} while (0)
    +
    +struct __large_struct { unsigned long buf[100]; };
    +#define __m(x) (*(struct __large_struct *)(x))
    +
    +/*
    + * We don't tell gcc that we are accessing memory, but this is OK
    + * because we do not write to any memory gcc knows about, so there
    + * are no aliasing issues.
    + */
    +#define __put_user_asm(x, addr, err, op) \
    + __asm__ __volatile__( \
    + "1: "op" 0(%2),%1\n" \
    + "2:\n" \
    + ".section .fixup,\"ax\"\n" \
    + "3: l.addi %0,r0,%3\n" \
    + " l.j 2b\n" \
    + " l.nop \n" \
    + ".previous\n" \
    + ".section __ex_table,\"a\"\n" \
    + " .align 2\n" \
    + " .long 1b,3b\n" \
    + ".previous" \
    + : "=r"(err) \
    + : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
    +
    +#define __put_user_asm2(x, addr, err) \
    + __asm__ __volatile__( \
    + "1: l.sw 0(%2),%1\n" \
    + "2: l.sw 4(%2),%H1\n" \
    + "3:\n" \
    + ".section .fixup,\"ax\"\n" \
    + "4: l.addi %0,r0,%3\n" \
    + " l.j 3b\n" \
    + " l.nop \n" \
    + ".previous\n" \
    + ".section __ex_table,\"a\"\n" \
    + " .align 2\n" \
    + " .long 1b,4b\n" \
    + " .long 2b,4b\n" \
    + ".previous" \
    + : "=r"(err) \
    + : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
    +
    +#define __get_user_nocheck(x,ptr,size) \
    +({ \
    + long __gu_err, __gu_val; \
    + __get_user_size(__gu_val,(ptr),(size),__gu_err); \
    + (x) = (__typeof__(*(ptr)))__gu_val; \
    + __gu_err; \
    +})
    +
    +#define __get_user_check(x,ptr,size) \
    +({ \
    + long __gu_err = -EFAULT, __gu_val = 0; \
    + const __typeof__(*(ptr)) *__gu_addr = (ptr); \
    + if (access_ok(VERIFY_READ,__gu_addr,size)) \
    + __get_user_size(__gu_val,__gu_addr,(size),__gu_err); \
    + (x) = (__typeof__(*(ptr)))__gu_val; \
    + __gu_err; \
    +})
    +
    +extern long __get_user_bad(void);
    +
    +#define __get_user_size(x,ptr,size,retval) \
    +do { \
    + retval = 0; \
    + switch (size) { \
    + case 1: __get_user_asm(x,ptr,retval,"l.lbz"); break; \
    + case 2: __get_user_asm(x,ptr,retval,"l.lhz"); break; \
    + case 4: __get_user_asm(x,ptr,retval,"l.lwz"); break; \
    + case 8: __get_user_asm2(x, ptr, retval); \
    + default: (x) = __get_user_bad(); \
    + } \
    +} while (0)
    +
    +#define __get_user_asm(x, addr, err, op) \
    + __asm__ __volatile__( \
    + "1: "op" %1,0(%2)\n" \
    + "2:\n" \
    + ".section .fixup,\"ax\"\n" \
    + "3: l.addi %0,r0,%3\n" \
    + " l.addi %1,r0,0\n" \
    + " l.j 2b\n" \
    + " l.nop \n" \
    + ".previous\n" \
    + ".section __ex_table,\"a\"\n" \
    + " .align 2\n" \
    + " .long 1b,3b\n" \
    + ".previous" \
    + : "=r"(err), "=r"(x) \
    + : "r"(addr), "i"(-EFAULT), "0"(err))
    +
    +#define __get_user_asm2(x, addr, err) \
    + __asm__ __volatile__( \
    + "1: l.lwz %1,0(%2)\n" \
    + "2: l.lwz %H1,4(%2)\n" \
    + "3:\n" \
    + ".section .fixup,\"ax\"\n" \
    + "4: l.addi %0,r0,%3\n" \
    + " l.addi %1,r0,0\n" \
    + " l.addi %H1,r0,0\n" \
    + " l.j 3b\n" \
    + " l.nop \n" \
    + ".previous\n" \
    + ".section __ex_table,\"a\"\n" \
    + " .align 2\n" \
    + " .long 1b,4b\n" \
    + " .long 2b,4b\n" \
    + ".previous" \
    + : "=r"(err), "=&r"(x) \
    + : "r"(addr), "i"(-EFAULT), "0"(err))
    +
    +/* more complex routines */
    +
    +extern unsigned long __must_check
    +__copy_tofrom_user(void *to, const void *from, unsigned long size);
    +
    +
    +
    +
    +
    +
    +
    +
    +
    +
    +
    +
    +
    +
    +
    +#define __copy_from_user(to, from, size) \
    + __copy_tofrom_user(to, from, size)
    +#define __copy_to_user(to, from, size) \
    + __copy_tofrom_user(to, from, size)
    +
    +#define __copy_to_user_inatomic __copy_to_user
    +#define __copy_from_user_inatomic __copy_from_user
    +
    +static inline unsigned long
    +copy_from_user(void *to, const void *from, unsigned long n)
    +{
    + unsigned long over;
    +
    + if (access_ok(VERIFY_READ, from, n))
    + return __copy_tofrom_user(to, from, n);
    + if ((unsigned long)from < TASK_SIZE) {
    + over = (unsigned long)from + n - TASK_SIZE;
    + return __copy_tofrom_user(to, from, n - over) + over;
    + }
    + return n;
    +}
    +
    +static inline unsigned long
    +copy_to_user(void *to, const void *from, unsigned long n)
    +{
    + unsigned long over;
    +
    + if (access_ok(VERIFY_WRITE, to, n))
    + return __copy_tofrom_user(to, from, n);
    + if ((unsigned long)to < TASK_SIZE) {
    + over = (unsigned long)to + n - TASK_SIZE;
    + return __copy_tofrom_user(to, from, n - over) + over;
    + }
    + return n;
    +}
    +
    +
    +extern unsigned long __clear_user(void *addr, unsigned long size);
    +
    +static inline __must_check unsigned long
    +clear_user(void *addr, unsigned long size)
    +{
    +
    + if (access_ok(VERIFY_WRITE, addr, size))
    + return __clear_user(addr, size);
    + if ((unsigned long)addr < TASK_SIZE) {
    + unsigned long over = (unsigned long)addr + size - TASK_SIZE;
    + return __clear_user(addr, size - over) + over;
    + }
    + return size;
    +}
    +
    +extern int __strncpy_from_user(char *dst, const char *src, long count);
    +
    +static inline long
    +strncpy_from_user(char *dst, const char *src, long count)
    +{
    + if (access_ok(VERIFY_READ, src, 1))
    + return __strncpy_from_user(dst, src, count);
    + return -EFAULT;
    +}
    +
    +/*
    + * Return the size of a string (including the ending 0)
    + *
    + * Return 0 for error
    + */
    +
    +extern int __strnlen_user(const char *str, long len, unsigned long top);
    +
    +/*
    + * Returns the length of the string at str (including the null byte),
    + * or 0 if we hit a page we can't access,
    + * or something > len if we didn't find a null byte.
    + *
    + * The `top' parameter to __strnlen_user is to make sure that
    + * we can never overflow from the user area into kernel space.
    + */
    +static inline long strnlen_user(const char __user *str, long len)
    +{
    +// unsigned long top = __kernel_ok? ~0UL: TASK_SIZE - 1;
    +
    + unsigned long top = (unsigned long) get_fs();
    + unsigned long res = 0;
    +
    + if (__addr_ok(str))
    + res = __strnlen_user(str, len, top);
    +
    + return res;
    +}
    +
    +//#define strlen_user(str) strnlen_user(str, 0x7ffffffe)
    +#define strlen_user(str) strnlen_user(str, TASK_SIZE-1)
    +
    +#endif /* __ASM_OPENRISC_UACCESS_H */
    diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c
    new file mode 100644
    index 0000000..a5dce82
    --- /dev/null
    +++ b/arch/openrisc/mm/fault.c
    @@ -0,0 +1,338 @@
    +/*
    + * OpenRISC fault.c
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * Modifications for the OpenRISC architecture:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * as published by the Free Software Foundation; either version
    + * 2 of the License, or (at your option) any later version.
    + */
    +
    +#include <linux/mm.h>
    +#include <linux/interrupt.h>
    +#include <linux/module.h>
    +#include <linux/sched.h>
    +
    +#include <asm/uaccess.h>
    +#include <asm/siginfo.h>
    +#include <asm/signal.h>
    +
    +#define NUM_TLB_ENTRIES 64
    +#define TLB_OFFSET(add) (((add) >> PAGE_SHIFT) & (NUM_TLB_ENTRIES-1))
    +
    +unsigned long pte_misses; /* updated by do_page_fault() */
    +unsigned long pte_errors; /* updated by do_page_fault() */
    +
    +/* __PHX__ :: - check the vmalloc_fault in do_page_fault()
    + * - also look into include/asm-or32/mmu_context.h
    + */
    +volatile pgd_t *current_pgd;
    +
    +extern void die(char *, struct pt_regs *, long);
    +
    +/*
    + * This routine handles page faults. It determines the address,
    + * and the problem, and then passes it off to one of the appropriate
    + * routines.
    + *
    + * If this routine detects a bad access, it returns 1, otherwise it
    + * returns 0.
    + */
    +
    +asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
    + unsigned long vector, int write_acc)
    +{
    + struct task_struct *tsk;
    + struct mm_struct *mm;
    + struct vm_area_struct *vma;
    + siginfo_t info;
    + int fault;
    +
    + tsk = current;
    +
    + /*
    + * We fault-in kernel-space virtual memory on-demand. The
    + * 'reference' page table is init_mm.pgd.
    + *
    + * NOTE! We MUST NOT take any locks for this case. We may
    + * be in an interrupt or a critical region, and should
    + * only copy the information from the master page table,
    + * nothing more.
    + *
    + * NOTE2: This is done so that, when updating the vmalloc
    + * mappings we don't have to walk all processes pgdirs and
    + * add the high mappings all at once. Instead we do it as they
    + * are used. However vmalloc'ed page entries have the PAGE_GLOBAL
    + * bit set so sometimes the TLB can use a lingering entry.
    + *
    + * This verifies that the fault happens in kernel space
    + * and that the fault was not a protection error.
    + */
    +
    + if (address >= VMALLOC_START &&
    + (vector != 0x300 && vector != 0x400) &&
    + !user_mode(regs))
    + goto vmalloc_fault;
    +
    + /* If exceptions were enabled, we can reenable them here */
    + if (user_mode(regs)) {
    + /* Exception was in userspace: reenable interrupts */
    + local_irq_enable();
    + } else {
    + /* If exception was in a syscall, then IRQ's may have
    + * been enabled or disabled. If they were enabled,
    + * reenable them.
    + */
    + if (regs->sr && (SPR_SR_IEE | SPR_SR_TEE))
    + local_irq_enable();
    + }
    +
    + mm = tsk->mm;
    + info.si_code = SEGV_MAPERR;
    +
    + /*
    + * If we're in an interrupt or have no user
    + * context, we must not take the fault..
    + */
    +
    + if (in_interrupt() || !mm)
    + goto no_context;
    +
    + down_read(&mm->mmap_sem);
    + vma = find_vma(mm, address);
    +
    + if (!vma)
    + goto bad_area;
    +
    + if (vma->vm_start <= address)
    + goto good_area;
    +
    + if (!(vma->vm_flags & VM_GROWSDOWN))
    + goto bad_area;
    +
    + if (user_mode(regs)) {
    + /*
    + * accessing the stack below usp is always a bug.
    + * we get page-aligned addresses so we can only check
    + * if we're within a page from usp, but that might be
    + * enough to catch brutal errors at least.
    + */
    + if (address + PAGE_SIZE < regs->sp)
    + goto bad_area;
    + }
    + if (expand_stack(vma, address))
    + goto bad_area;
    +
    + /*
    + * Ok, we have a good vm_area for this memory access, so
    + * we can handle it..
    + */
    +
    +good_area:
    + info.si_code = SEGV_ACCERR;
    +
    + /* first do some preliminary protection checks */
    +
    + if (write_acc) {
    + if (!(vma->vm_flags & VM_WRITE))
    + goto bad_area;
    + } else {
    + /* not present */
    + if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
    + goto bad_area;
    + }
    +
    + /* are we trying to execute nonexecutable area */
    + if ((vector == 0x400) && !(vma->vm_page_prot.pgprot & _PAGE_EXEC))
    + goto bad_area;
    +
    + /*
    + * If for any reason at all we couldn't handle the fault,
    + * make sure we exit gracefully rather than endlessly redo
    + * the fault.
    + */
    +
    + fault = handle_mm_fault(mm, vma, address, write_acc);
    + if (unlikely(fault & VM_FAULT_ERROR)) {
    + if (fault & VM_FAULT_OOM)
    + goto out_of_memory;
    + else if (fault & VM_FAULT_SIGBUS)
    + goto do_sigbus;
    + BUG();
    + }
    + /*RGD modeled on Cris */
    + if (fault & VM_FAULT_MAJOR)
    + tsk->maj_flt++;
    + else
    + tsk->min_flt++;
    +
    + up_read(&mm->mmap_sem);
    + return;
    +
    + /*
    + * Something tried to access memory that isn't in our memory map..
    + * Fix it, but check if it's kernel or user first..
    + */
    +
    +bad_area:
    + up_read(&mm->mmap_sem);
    +
    +bad_area_nosemaphore:
    +
    + /* User mode accesses just cause a SIGSEGV */
    +
    + if (user_mode(regs)) {
    + info.si_signo = SIGSEGV;
    + info.si_errno = 0;
    + /* info.si_code has been set above */
    + info.si_addr = (void *)address;
    + force_sig_info(SIGSEGV, &info, tsk);
    + return;
    + }
    +
    +no_context:
    +
    + /* Are we prepared to handle this kernel fault?
    + *
    + * (The kernel has valid exception-points in the source
    + * when it acesses user-memory. When it fails in one
    + * of those points, we find it in a table and do a jump
    + * to some fixup code that loads an appropriate error
    + * code)
    + */
    +
    + {
    + const struct exception_table_entry *entry;
    +
    + __asm__ __volatile__("l.nop 42");
    +
    + if ((entry = search_exception_tables(regs->pc)) != NULL) {
    + /* Adjust the instruction pointer in the stackframe */
    + regs->pc = entry->fixup;
    + return;
    + }
    + }
    +
    + /*
    + * Oops. The kernel tried to access some bad page. We'll have to
    + * terminate things with extreme prejudice.
    + */
    +
    + if ((unsigned long)(address) < PAGE_SIZE)
    + printk(KERN_ALERT
    + "Unable to handle kernel NULL pointer dereference");
    + else
    + printk(KERN_ALERT "Unable to handle kernel access");
    + printk(" at virtual address 0x%08lx\n", address);
    +
    + die("Oops", regs, write_acc);
    +
    + do_exit(SIGKILL);
    +
    + /*
    + * We ran out of memory, or some other thing happened to us that made
    + * us unable to handle the page fault gracefully.
    + */
    +
    +out_of_memory:
    + __asm__ __volatile__("l.nop 42");
    + __asm__ __volatile__("l.nop 1");
    +
    + up_read(&mm->mmap_sem);
    + printk("VM: killing process %s\n", tsk->comm);
    + if (user_mode(regs))
    + do_exit(SIGKILL);
    + goto no_context;
    +
    +do_sigbus:
    + up_read(&mm->mmap_sem);
    +
    + /*
    + * Send a sigbus, regardless of whether we were in kernel
    + * or user mode.
    + */
    + info.si_signo = SIGBUS;
    + info.si_errno = 0;
    + info.si_code = BUS_ADRERR;
    + info.si_addr = (void *)address;
    + force_sig_info(SIGBUS, &info, tsk);
    +
    + /* Kernel mode? Handle exceptions or die */
    + if (!user_mode(regs))
    + goto no_context;
    + return;
    +
    +vmalloc_fault:
    + {
    + /*
    + * Synchronize this task's top level page-table
    + * with the 'reference' page table.
    + *
    + * Use current_pgd instead of tsk->active_mm->pgd
    + * since the latter might be unavailable if this
    + * code is executed in a misfortunately run irq
    + * (like inside schedule() between switch_mm and
    + * switch_to...).
    + */
    +
    + int offset = pgd_index(address);
    + pgd_t *pgd, *pgd_k;
    + pud_t *pud, *pud_k;
    + pmd_t *pmd, *pmd_k;
    + pte_t *pte_k;
    +
    +/*
    + phx_warn("do_page_fault(): vmalloc_fault will not work, "
    + "since current_pgd assign a proper value somewhere\n"
    + "anyhow we don't need this at the moment\n");
    +
    + phx_mmu("vmalloc_fault");
    +*/
    + pgd = (pgd_t *)current_pgd + offset;
    + pgd_k = init_mm.pgd + offset;
    +
    + /* Since we're two-level, we don't need to do both
    + * set_pgd and set_pmd (they do the same thing). If
    + * we go three-level at some point, do the right thing
    + * with pgd_present and set_pgd here.
    + *
    + * Also, since the vmalloc area is global, we don't
    + * need to copy individual PTE's, it is enough to
    + * copy the pgd pointer into the pte page of the
    + * root task. If that is there, we'll find our pte if
    + * it exists.
    + */
    +
    + pud = pud_offset(pgd, address);
    + pud_k = pud_offset(pgd_k, address);
    + if (!pud_present(*pud_k))
    + goto no_context;
    +
    + pmd = pmd_offset(pud, address);
    + pmd_k = pmd_offset(pud_k, address);
    +
    + if (!pmd_present(*pmd_k))
    + goto bad_area_nosemaphore;
    +
    + set_pmd(pmd, *pmd_k);
    +
    + /* Make sure the actual PTE exists as well to
    + * catch kernel vmalloc-area accesses to non-mapped
    + * addresses. If we don't do this, this will just
    + * silently loop forever.
    + */
    +
    + pte_k = pte_offset_kernel(pmd_k, address);
    + if (!pte_present(*pte_k))
    + goto no_context;
    +
    + return;
    + }
    +}
    diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
    new file mode 100644
    index 0000000..428f66f
    --- /dev/null
    +++ b/arch/openrisc/mm/init.c
    @@ -0,0 +1,329 @@
    +/*
    + * OpenRISC idle.c
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * Modifications for the OpenRISC architecture:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * as published by the Free Software Foundation; either version
    + * 2 of the License, or (at your option) any later version.
    + */
    +
    +#include <linux/signal.h>
    +#include <linux/sched.h>
    +#include <linux/kernel.h>
    +#include <linux/errno.h>
    +#include <linux/string.h>
    +#include <linux/types.h>
    +#include <linux/ptrace.h>
    +#include <linux/mman.h>
    +#include <linux/mm.h>
    +#include <linux/swap.h>
    +#include <linux/smp.h>
    +#include <linux/bootmem.h>
    +#include <linux/init.h>
    +#include <linux/delay.h>
    +#include <linux/blkdev.h> /* for initrd_* */
    +#include <linux/pagemap.h>
    +#include <linux/memblock.h>
    +
    +#include <asm/system.h>
    +#include <asm/segment.h>
    +#include <asm/pgalloc.h>
    +#include <asm/pgtable.h>
    +#include <asm/dma.h>
    +#include <asm/io.h>
    +#include <asm/tlb.h>
    +#include <asm/mmu_context.h>
    +#include <asm/kmap_types.h>
    +#include <asm/fixmap.h>
    +#include <asm/tlbflush.h>
    +
    +int mem_init_done = 0;
    +
    +DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
    +
    +static void __init zone_sizes_init(void)
    +{
    + unsigned long zones_size[MAX_NR_ZONES];
    +
    + /* Clear the zone sizes */
    + memset(zones_size, 0, sizeof(zones_size));
    +
    + /*
    + * We use only ZONE_NORMAL
    + */
    + zones_size[ZONE_NORMAL] = max_low_pfn;
    +
    + free_area_init(zones_size);
    +}
    +
    +extern const char _s_kernel_ro[], _e_kernel_ro[];
    +
    +/*
    + * Map all physical memory into kernel's address space.
    + *
    + * This is explicitly coded for two-level page tables, so if you need
    + * something else then this needs to change.
    + */
    +static void __init map_ram(void)
    +{
    + unsigned long v, p, e;
    + pgprot_t prot;
    + pgd_t *pge;
    + pud_t *pue;
    + pmd_t *pme;
    + pte_t *pte;
    + /* These mark extents of read-only kernel pages...
    + * ...from vmlinux.lds.S
    + */
    + struct memblock_region* region;
    +
    + v = PAGE_OFFSET;
    +
    + for_each_memblock(memory, region) {
    + p = (u32) region->base & PAGE_MASK;
    + e = p + (u32) region->size;
    +
    + v = (u32) __va(p);
    + pge = pgd_offset_k(v);
    +
    + while (p < e) {
    + int j;
    + pue = pud_offset(pge,v);
    + pme = pmd_offset(pue,v);
    +
    + if ((u32)pue != (u32)pge || (u32)pme != (u32)pge) {
    + panic("%s: OR1K kernel hardcoded for two-level page tables", __func__);
    + }
    +
    + /* Alloc one page for holding PTE's... */
    + pte = (pte_t*) alloc_bootmem_low_pages(PAGE_SIZE);
    + set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
    +
    + /* Fill the newly allocated page with PTE'S */
    + for (j = 0; p < e && j < PTRS_PER_PGD;
    + v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
    + if (v >= (u32) _e_kernel_ro ||
    + v < (u32) _s_kernel_ro)
    + prot = PAGE_KERNEL;
    + else
    + prot = PAGE_KERNEL_RO;
    +
    + set_pte(pte, mk_pte_phys(p, prot));
    + }
    +
    + pge++;
    + }
    +
    + printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
    + region->base,
    + region->base + region->size);
    + }
    +}
    +
    +
    +void __init paging_init(void)
    +{
    + extern void tlb_init(void);
    +
    + unsigned long end;
    + int i;
    +
    + printk("Setting up paging and PTEs.\n");
    +
    + /* clear out the init_mm.pgd that will contain the kernel's mappings */
    +
    + for(i = 0; i < PTRS_PER_PGD; i++)
    + swapper_pg_dir[i] = __pgd(0);
    +
    + /* make sure the current pgd table points to something sane
    + * (even if it is most probably not used until the next
    + * switch_mm)
    + */
    + current_pgd = init_mm.pgd;
    +
    + end = (unsigned long)__va(max_low_pfn*PAGE_SIZE);
    +
    + map_ram();
    +
    + zone_sizes_init();
    +
    + /* self modifying code ;) */
    + /* Since the old TLB miss handler has been running up until now,
    + * the kernel pages are still all RW, so we can still modify the
    + * text directly... after this change and a TLB flush, the kernel
    + * pages will become RO.
    + */
    + {
    + extern unsigned long dtlb_miss_handler;
    + extern unsigned long itlb_miss_handler;
    +
    + unsigned long *dtlb_vector = __va(0x900);
    + unsigned long *itlb_vector = __va(0xa00);
    +
    + printk("dtlb_miss_handler %p\n", &dtlb_miss_handler);
    + *dtlb_vector = ((unsigned long)&dtlb_miss_handler -
    + (unsigned long)dtlb_vector) >> 2;
    +
    + printk("itlb_miss_handler %p\n", &itlb_miss_handler);
    + *itlb_vector = ((unsigned long)&itlb_miss_handler -
    + (unsigned long)itlb_vector) >> 2;
    + }
    +
    + /* Invalidate instruction caches after code modification */
    + mtspr(SPR_ICBIR, 0x900);
    + mtspr(SPR_ICBIR, 0xa00);
    +
    + /* New TLB miss handlers and kernel page tables are in now place.
    + * Make sure that page flags get updated for all pages in TLB by
    + * flushing the TLB and forcing all TLB entries to be recreated
    + * from their page table flags.
    + */
    + flush_tlb_all();
    +}
    +
    +
    +/* References to section boundaries */
    +
    +extern char _stext, _etext, _edata, __bss_start, _end;
    +extern char __init_begin, __init_end;
    +
    +static int __init free_pages_init(void)
    +{
    + int reservedpages, pfn;
    +
    + /* this will put all low memory onto the freelists */
    + totalram_pages = free_all_bootmem();
    +
    + reservedpages = 0;
    + for (pfn = 0; pfn < max_low_pfn; pfn++) {
    + /*
    + * Only count reserved RAM pages
    + */
    + if (PageReserved(mem_map+pfn))
    + reservedpages++;
    + }
    +
    + return reservedpages;
    +}
    +
    +static void __init set_max_mapnr_init(void)
    +{
    + max_mapnr = num_physpages = max_low_pfn;
    +}
    +
    +void __init mem_init(void)
    +{
    + int codesize, reservedpages, datasize, initsize;
    +
    + if (!mem_map)
    + BUG();
    +
    + set_max_mapnr_init();
    +
    + high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
    +
    + /* clear the zero-page */
    + memset((void*)empty_zero_page, 0, PAGE_SIZE);
    +
    + reservedpages = free_pages_init();
    +
    + codesize = (unsigned long) &_etext - (unsigned long) &_stext;
    + datasize = (unsigned long) &_edata - (unsigned long) &_etext;
    + initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
    +
    + printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
    + (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
    + max_mapnr << (PAGE_SHIFT-10),
    + codesize >> 10,
    + reservedpages << (PAGE_SHIFT-10),
    + datasize >> 10,
    + initsize >> 10,
    + (unsigned long) (0 << (PAGE_SHIFT-10))
    + );
    +
    + printk("mem_init_done ...........................................\n");
    + mem_init_done = 1;
    + return;
    +}
    +
    +#ifdef CONFIG_BLK_DEV_INITRD
    +void free_initrd_mem(unsigned long start, unsigned long end)
    +{
    + printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
    +
    + for (; start < end; start += PAGE_SIZE) {
    + ClearPageReserved(virt_to_page(start));
    + init_page_count(virt_to_page(start));
    + free_page(start);
    + totalram_pages++;
    + }
    +}
    +#endif
    +
    +void free_initmem(void)
    +{
    + unsigned long addr;
    +
    + addr = (unsigned long)(&__init_begin);
    + for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
    + ClearPageReserved(virt_to_page(addr));
    + init_page_count(virt_to_page(addr));
    + free_page(addr);
    + totalram_pages++;
    + }
    + printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
    + ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
    +}
    +
    +#if 1
    +/*
    + * Associate a virtual page frame with a given physical page frame
    + * and protection flags for that frame.
    + */
    +static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
    +{
    + pgd_t *pgd;
    + pud_t *pud;
    + pmd_t *pmd;
    + pte_t *pte;
    +
    + pgd = swapper_pg_dir + pgd_index(vaddr);
    + if (pgd_none(*pgd)) {
    + BUG();
    + return;
    + }
    + pud = pud_offset(pgd, vaddr);
    + if (pud_none(*pud)) {
    + BUG();
    + return;
    + }
    + pmd = pmd_offset(pud, vaddr);
    + if (pmd_none(*pmd)) {
    + BUG();
    + return;
    + }
    + pte = pte_offset_kernel(pmd, vaddr);
    + /* <pfn,flags> stored as-is, to permit clearing entries */
    + set_pte(pte, pfn_pte(pfn, flags));
    +}
    +
    +void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
    +{
    + unsigned long address = __fix_to_virt(idx);
    +
    + if (idx >= __end_of_fixed_addresses) {
    + BUG();
    + return;
    + }
    + set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
    + flush_tlb_all();
    +}
    +#endif
    diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
    new file mode 100644
    index 0000000..c5ded5a
    --- /dev/null
    +++ b/arch/openrisc/mm/ioremap.c
    @@ -0,0 +1,112 @@
    +/*
    + * OpenRISC ioremap.c
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * Modifications for the OpenRISC architecture:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * as published by the Free Software Foundation; either version
    + * 2 of the License, or (at your option) any later version.
    + */
    +
    +#include <linux/vmalloc.h>
    +#include <linux/io.h>
    +#include <asm/pgalloc.h>
    +#include <asm/kmap_types.h>
    +#include <asm/fixmap.h>
    +#include <asm/bug.h>
    +#include <asm/pgtable.h>
    +#include <linux/sched.h>
    +
    +extern int mem_init_done;
    +
    +static unsigned int fixmaps_used __initdata = 0;
    +
    +/*
    + * Remap an arbitrary physical address space into the kernel virtual
    + * address space. Needed when the kernel wants to access high addresses
    + * directly.
    + *
    + * NOTE! We need to allow non-page-aligned mappings too: we will obviously
    + * have to convert them into an offset in a page-aligned mapping, but the
    + * caller shouldn't need to know that small detail.
    + */
    +void __iomem* __init_refok
    +__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
    +{
    + phys_addr_t p;
    + unsigned long v;
    + unsigned long offset, last_addr;
    + struct vm_struct *area = NULL;
    + pgprot_t prot;
    +
    + /* Don't allow wraparound or zero size */
    + last_addr = addr + size - 1;
    + if (!size || last_addr < addr)
    + return NULL;
    +
    + /*
    + * Mappings have to be page-aligned
    + */
    + offset = addr & ~PAGE_MASK;
    + p = addr & PAGE_MASK;
    + size = PAGE_ALIGN(last_addr+1) - p;
    +
    + if (likely(mem_init_done)) {
    + area = get_vm_area(size, VM_IOREMAP);
    + if (!area)
    + return NULL;
    + v = (unsigned long) area->addr;
    + } else {
    + if ((fixmaps_used + (size >> PAGE_SHIFT)) > FIX_N_IOREMAPS)
    + return NULL;
    + v = fix_to_virt(FIX_IOREMAP_BEGIN+fixmaps_used);
    + fixmaps_used += (size >> PAGE_SHIFT);
    + }
    +
    + prot = __pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE |
    + _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC | flags);
    +
    + if (ioremap_page_range(v, v + size, p, prot)) {
    + if (likely(mem_init_done))
    + vfree(area->addr);
    + else
    + fixmaps_used -= (size >> PAGE_SHIFT);
    + return NULL;
    + }
    +
    +
    + return (void __iomem *) (offset + (char *)v);
    +}
    +
    +void iounmap(void *addr)
    +{
    + /* If the page is from the fixmap pool then we just clear out
    + * the fixmap mapping.
    + */
    + if (unlikely((unsigned long)addr > FIXADDR_START)) {
    + clear_fixmap(virt_to_fix((unsigned long) addr));
    + return;
    + }
    +
    + return vfree((void *) (PAGE_MASK & (unsigned long) addr));
    +}
    +
    +/*
    + * OR1K has no port-mapped IO, only MMIO
    + */
    +void __iomem *ioport_map(unsigned long port, unsigned int len)
    +{
    + BUG();
    +}
    +
    +void ioport_unmap(void __iomem *addr)
    +{
    + BUG();
    +}
    diff --git a/arch/openrisc/mm/tlb.c b/arch/openrisc/mm/tlb.c
    new file mode 100644
    index 0000000..a2fb83e
    --- /dev/null
    +++ b/arch/openrisc/mm/tlb.c
    @@ -0,0 +1,198 @@
    +/*
    + * OpenRISC tlb.c
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * Modifications for the OpenRISC architecture:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Julius Baxter <julius.baxter@orsoc.se>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * as published by the Free Software Foundation; either version
    + * 2 of the License, or (at your option) any later version.
    + */
    +
    +#include <linux/sched.h>
    +#include <linux/kernel.h>
    +#include <linux/errno.h>
    +#include <linux/string.h>
    +#include <linux/types.h>
    +#include <linux/ptrace.h>
    +#include <linux/mman.h>
    +#include <linux/mm.h>
    +#include <linux/init.h>
    +
    +#include <asm/system.h>
    +#include <asm/segment.h>
    +#include <asm/tlbflush.h>
    +#include <asm/pgtable.h>
    +#include <asm/mmu_context.h>
    +#include <asm/spr_defs.h>
    +
    +#define NO_CONTEXT -1
    +
    +#define NUM_DTLB_SETS (1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> \
    + SPR_DMMUCFGR_NTS_OFF))
    +#define NUM_ITLB_SETS (1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> \
    + SPR_IMMUCFGR_NTS_OFF))
    +#define DTLB_OFFSET(addr) (((addr) >> PAGE_SHIFT) & (NUM_DTLB_SETS-1))
    +#define ITLB_OFFSET(addr) (((addr) >> PAGE_SHIFT) & (NUM_ITLB_SETS-1))
    +/*
    + * Invalidate all TLB entries.
    + *
    + * This comes down to setting the 'valid' bit for all xTLBMR registers to 0.
    + * Easiest way to accomplish this is to just zero out the xTLBMR register
    + * completely.
    + *
    + */
    +
    +void flush_tlb_all(void)
    +{
    + int i;
    + unsigned long num_tlb_sets;
    +
    + /* Determine number of sets for IMMU. */
    + /* FIXME: Assumption is I & D nsets equal. */
    + num_tlb_sets = NUM_ITLB_SETS;
    +
    + for(i = 0; i < num_tlb_sets; i++) {
    + mtspr_off(SPR_DTLBMR_BASE(0), i, 0);
    + mtspr_off(SPR_ITLBMR_BASE(0), i, 0);
    + }
    +}
    +
    +
    +#define have_dtlbeir (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_TEIRI)
    +#define have_itlbeir (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_TEIRI)
    +
    +/*
    + * Invalidate a single page. This is what the xTLBEIR register is for.
    + *
    + * There's no point in checking the vma for PAGE_EXEC to determine whether it's
    + * the data or instruction TLB that should be flushed... that would take more
    + * than the few instructions that the following compiles down to!
    + *
    + * The case where we don't have the xTLBEIR register really only works for
    + * MMU's with a single way and is hard-coded that way.
    + */
    +
    +#define flush_dtlb_page_eir(addr) mtspr(SPR_DTLBEIR, addr)
    +#define flush_dtlb_page_no_eir(addr) mtspr_off(SPR_DTLBMR_BASE(0), DTLB_OFFSET(addr), 0);
    +
    +#define flush_itlb_page_eir(addr) mtspr(SPR_ITLBEIR, addr)
    +#define flush_itlb_page_no_eir(addr) mtspr_off(SPR_ITLBMR_BASE(0), ITLB_OFFSET(addr), 0);
    +
    +void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
    +{
    + if (have_dtlbeir) {
    + flush_dtlb_page_eir(addr);
    + } else {
    + flush_dtlb_page_no_eir(addr);
    + }
    +
    + if (have_itlbeir) {
    + flush_itlb_page_eir(addr);
    + } else {
    + flush_itlb_page_no_eir(addr);
    + }
    +}
    +
    +void flush_tlb_range(struct vm_area_struct *vma,
    + unsigned long start,
    + unsigned long end)
    +{
    + int addr;
    + bool dtlbeir;
    + bool itlbeir;
    +
    + dtlbeir = have_dtlbeir;
    + itlbeir = have_itlbeir;
    +
    + for (addr = start; addr < end; addr += PAGE_SIZE) {
    + if (dtlbeir)
    + flush_dtlb_page_eir(addr);
    + else
    + flush_dtlb_page_no_eir(addr);
    +
    + if (itlbeir)
    + flush_itlb_page_eir(addr);
    + else
    + flush_itlb_page_no_eir(addr);
    + }
    +}
    +
    +/*
    + * Invalidate the selected mm context only.
    + *
    + * FIXME: Due to some bug here, we're flushing everything for now.
    + * This should be changed to loop over over mm and call flush_tlb_range.
    + */
    +
    +void flush_tlb_mm(struct mm_struct *mm)
    +{
    +
    + /* Was seeing bugs with the mm struct passed to us. Scrapped most of
    + this function. */
    + /* Several architctures do this */
    + flush_tlb_all();
    +}
    +
    +
    +
    +
    +/* called in schedule() just before actually doing the switch_to */
    +
    +void switch_mm(struct mm_struct *prev, struct mm_struct *next,
    + struct task_struct *next_tsk)
    +{
    + /* remember the pgd for the fault handlers
    + * this is similar to the pgd register in some other CPU's.
    + * we need our own copy of it because current and active_mm
    + * might be invalid at points where we still need to derefer
    + * the pgd.
    + */
    + current_pgd = next->pgd;
    +
    + /* We don't have context support implemented, so flush all
    + * entries belonging to previous map
    + */
    +
    + if (prev != next)
    + flush_tlb_mm(prev);
    +
    +}
    +
    +/*
    + * Initialize the context related info for a new mm_struct
    + * instance.
    + */
    +
    +int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
    +{
    + mm->context = NO_CONTEXT;
    + return 0;
    +}
    +
    +/* called by __exit_mm to destroy the used MMU context if any before
    + * destroying the mm itself. this is only called when the last user of the mm
    + * drops it.
    + */
    +
    +void destroy_context(struct mm_struct *mm)
    +{
    + flush_tlb_mm(mm);
    +
    +}
    +
    +/* called once during VM initialization, from init.c */
    +
    +void __init tlb_init(void)
    +{
    + /* Do nothing... */
    + /* invalidate the entire TLB */
    +// flush_tlb_all();
    +}
    --
    1.7.4.1


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