lkml.org 
[lkml]   [2013]   [Jan]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 09/44] metag: Boot
Date
Add boot code for metag. Due to the multi-threaded nature of Meta it is
not uncommon for an RTOS or bare metal application to be started on
other hardware threads by the bootloader. Since there is a single MMU
switch which affects all threads, the MMU is traditionally configured by
the bootloader prior to starting Linux. The bootloader passes a
structure to Linux which among other things contains information about
memory regions which have been mapped. Linux then assumes control of the
local heap memory region.

A kernel arguments string pointer or a flattened device tree pointer can
be provided in the third argument.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
---
arch/metag/boot/.gitignore | 4 +
arch/metag/include/asm/mach/arch.h | 82 ++++++
arch/metag/include/asm/setup.h | 8 +
arch/metag/kernel/head.S | 45 +++
arch/metag/kernel/machines.c | 20 ++
arch/metag/kernel/setup.c | 556 ++++++++++++++++++++++++++++++++++++
6 files changed, 715 insertions(+), 0 deletions(-)
create mode 100644 arch/metag/boot/.gitignore
create mode 100644 arch/metag/include/asm/mach/arch.h
create mode 100644 arch/metag/include/asm/setup.h
create mode 100644 arch/metag/kernel/head.S
create mode 100644 arch/metag/kernel/machines.c
create mode 100644 arch/metag/kernel/setup.c

diff --git a/arch/metag/boot/.gitignore b/arch/metag/boot/.gitignore
new file mode 100644
index 0000000..a021da2
--- /dev/null
+++ b/arch/metag/boot/.gitignore
@@ -0,0 +1,4 @@
+vmlinux*
+uImage*
+ramdisk.*
+*.dtb
diff --git a/arch/metag/include/asm/mach/arch.h b/arch/metag/include/asm/mach/arch.h
new file mode 100644
index 0000000..6845d80
--- /dev/null
+++ b/arch/metag/include/asm/mach/arch.h
@@ -0,0 +1,82 @@
+/*
+ * arch/metag/include/asm/mach/arch.h
+ *
+ * Copyright (C) 2012 Imagination Technologies Ltd.
+ *
+ * based on the ARM version:
+ * Copyright (C) 2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _METAG_MACH_ARCH_H_
+#define _METAG_MACH_ARCH_H_
+
+#include <linux/stddef.h>
+
+/**
+ * struct machine_desc - Describes a board controlled by a Meta.
+ * @name: Board/SoC name.
+ * @dt_compat: Array of device tree 'compatible' strings.
+ *
+ * @nr_irqs: Maximum number of IRQs.
+ * If 0, defaults to NR_IRQS in asm-generic/irq.h.
+ *
+ * @init_early: Early init callback.
+ * @init_irq: IRQ init callback for setting up IRQ controllers.
+ * @init_machine: Arch init callback for setting up devices.
+ * @init_late: Late init callback.
+ *
+ * This structure is provided by each board which can be controlled by a Meta.
+ * It is chosen by matching the compatible strings in the device tree provided
+ * by the bootloader with the strings in @dt_compat, and sets up any aspects of
+ * the machine that aren't configured with device tree (yet).
+ */
+struct machine_desc {
+ const char *name;
+ const char **dt_compat;
+
+ unsigned int nr_irqs;
+
+ void (*init_early)(void);
+ void (*init_irq)(void);
+ void (*init_machine)(void);
+ void (*init_late)(void);
+};
+
+/*
+ * Current machine - only accessible during boot.
+ */
+extern struct machine_desc *machine_desc;
+
+/*
+ * Machine type table - also only accessible during boot
+ */
+extern struct machine_desc __arch_info_begin[], __arch_info_end[];
+#define for_each_machine_desc(p) \
+ for (p = __arch_info_begin; p < __arch_info_end; p++)
+
+static inline struct machine_desc *default_machine_desc(void)
+{
+ /* the default machine is the last one linked in */
+ if (__arch_info_end - 1 < __arch_info_begin)
+ return NULL;
+ return __arch_info_end - 1;
+}
+
+/*
+ * Set of macros to define architecture features. This is built into
+ * a table by the linker.
+ */
+#define MACHINE_START(_type, _name) \
+static const struct machine_desc __mach_desc_##_type \
+__used \
+__attribute__((__section__(".arch.info.init"))) = { \
+ .name = _name,
+
+#define MACHINE_END \
+};
+
+#endif /* _METAG_MACH_ARCH_H_ */
diff --git a/arch/metag/include/asm/setup.h b/arch/metag/include/asm/setup.h
new file mode 100644
index 0000000..e13083b
--- /dev/null
+++ b/arch/metag/include/asm/setup.h
@@ -0,0 +1,8 @@
+#ifndef _ASM_METAG_SETUP_H
+#define _ASM_METAG_SETUP_H
+
+#include <uapi/asm/setup.h>
+
+void per_cpu_trap_init(unsigned long);
+extern void __init dump_machine_table(void);
+#endif /* _ASM_METAG_SETUP_H */
diff --git a/arch/metag/kernel/head.S b/arch/metag/kernel/head.S
new file mode 100644
index 0000000..8b13886
--- /dev/null
+++ b/arch/metag/kernel/head.S
@@ -0,0 +1,45 @@
+ ! Copyright 2005,2006,2007,2009 Imagination Technologies
+
+#include <linux/init.h>
+#include <generated/asm-offsets.h>
+#undef __exit
+
+ __HEAD
+ ! Setup the stack and get going into _metag_start_kernel
+ .global __start
+ .type __start,function
+__start:
+ ! D1Ar1 contains pTBI (ISTAT)
+ ! D0Ar2 contains pTBI
+ ! D1Ar3 contains __pTBISegs
+ ! D0Ar4 contains kernel arglist pointer
+
+ MOVT D0Re0,#HI(___pTBIs)
+ ADD D0Re0,D0Re0,#LO(___pTBIs)
+ SETL [D0Re0],D0Ar2,D1Ar1
+ MOVT D0Re0,#HI(___pTBISegs)
+ ADD D0Re0,D0Re0,#LO(___pTBISegs)
+ SETD [D0Re0],D1Ar3
+ MOV A0FrP,#0
+ MOV D0Re0,#0
+ MOV D1Re0,#0
+ MOV D1Ar3,#0
+ MOV D1Ar1,D0Ar4 !Store kernel boot params
+ MOV D1Ar5,#0
+ MOV D0Ar6,#0
+#ifdef CONFIG_METAG_DSP
+ MOV D0.8,#0
+#endif
+ MOVT A0StP,#HI(_init_thread_union)
+ ADD A0StP,A0StP,#LO(_init_thread_union)
+ ADD A0StP,A0StP,#THREAD_INFO_SIZE
+ MOVT D1RtP,#HI(_metag_start_kernel)
+ CALL D1RtP,#LO(_metag_start_kernel)
+ .size __start,.-__start
+
+ !! Needed by TBX
+ .global __exit
+ .type __exit,function
+__exit:
+ XOR TXENABLE,D0Re0,D0Re0
+ .size __exit,.-__exit
diff --git a/arch/metag/kernel/machines.c b/arch/metag/kernel/machines.c
new file mode 100644
index 0000000..1edf6ba
--- /dev/null
+++ b/arch/metag/kernel/machines.c
@@ -0,0 +1,20 @@
+/*
+ * arch/metag/kernel/machines.c
+ *
+ * Copyright (C) 2012 Imagination Technologies Ltd.
+ *
+ * Generic Meta Boards.
+ */
+
+#include <linux/init.h>
+#include <asm/irq.h>
+#include <asm/mach/arch.h>
+
+static const char *meta_boards_compat[] __initdata = {
+ "img,meta",
+ NULL,
+};
+
+MACHINE_START(META, "Generic Meta")
+ .dt_compat = meta_boards_compat,
+MACHINE_END
diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c
new file mode 100644
index 0000000..139b109
--- /dev/null
+++ b/arch/metag/kernel/setup.c
@@ -0,0 +1,556 @@
+/*
+ * Copyright (C) 2005-2012 Imagination Technologies Ltd.
+ *
+ * This file contains the architecture-dependant parts of system setup.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/console.h>
+#include <linux/genhd.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/root_dev.h>
+#include <linux/initrd.h>
+#include <linux/seq_file.h>
+#include <linux/pfn.h>
+#include <linux/start_kernel.h>
+#include <linux/cpu.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+
+#include <asm/cachepart.h>
+#include <asm/clock.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/processor.h>
+#include <asm/traps.h>
+#include <asm/mmu.h>
+#include <asm/cpu.h>
+#include <asm/hwthread.h>
+#include <asm/mmzone.h>
+#include <asm/l2cache.h>
+#include <asm/prom.h>
+#include <asm/mach/arch.h>
+#include <asm/core_reg.h>
+#include <asm/highmem.h>
+
+/* PRIV protect as many registers as possible. */
+#define DEFAULT_PRIV 0xff0f7f00
+
+/* Enable unaligned access checking. */
+#define UNALIGNED_PRIV 0x00000010
+
+#ifdef CONFIG_METAG_UNALIGNED
+#define PRIV_BITS (DEFAULT_PRIV | UNALIGNED_PRIV)
+#else
+#define PRIV_BITS DEFAULT_PRIV
+#endif
+
+extern char _heap_start[];
+
+#ifdef CONFIG_METAG_BUILTIN_DTB
+extern u32 __dtb_start[];
+#endif
+
+struct machine_desc *machine_desc __initdata;
+
+/*
+ * Map a Linux CPU number to a hardware thread ID
+ * In SMP this will be setup with the correct mapping at startup; in UP this
+ * will map to the HW thread on which we are running.
+ */
+u8 cpu_2_hwthread_id[NR_CPUS] __read_mostly = {
+ [0 ... NR_CPUS-1] = BAD_HWTHREAD_ID
+};
+
+/*
+ * Map a hardware thread ID to a Linux CPU number
+ * In SMP this will be fleshed out with the correct CPU ID for a particular
+ * hardware thread. In UP this will be initialised with the boot CPU ID.
+ */
+u8 hwthread_id_2_cpu[4] __read_mostly = {
+ [0 ... 3] = BAD_CPU_ID
+};
+
+/* The relative offset of the MMU mapped memory (from ldlk or bootloader)
+ * to the real physical memory. This is needed as we have to use the
+ * physical addresses in the MMU tables (pte entries), and not the virtual
+ * addresses.
+ * This variable is used in the __pa() and __va() macros, and should
+ * probably only be used via them.
+ */
+unsigned int meta_memoffset;
+
+static char __initdata *original_cmd_line;
+
+DEFINE_PER_CPU(PTBI, pTBI);
+
+/*
+ * Mapping are specified as "CPU_ID:HWTHREAD_ID", e.g.
+ *
+ * "hwthread_map=0:1,1:2,2:3,3:0"
+ *
+ * Linux CPU ID HWTHREAD_ID
+ * ---------------------------
+ * 0 1
+ * 1 2
+ * 2 3
+ * 3 0
+ */
+static int __init parse_hwthread_map(char *p)
+{
+ int cpu;
+
+ while (*p) {
+ cpu = (*p++) - '0';
+ if (cpu < 0 || cpu > 9)
+ goto err_cpu;
+
+ p++; /* skip semi-colon */
+ cpu_2_hwthread_id[cpu] = (*p++) - '0';
+ if (cpu_2_hwthread_id[cpu] >= 4)
+ goto err_thread;
+ hwthread_id_2_cpu[cpu_2_hwthread_id[cpu]] = cpu;
+
+ if (*p == ',')
+ p++; /* skip comma */
+ }
+
+ return 0;
+err_cpu:
+ pr_err("%s: hwthread_map cpu argument out of range\n", __func__);
+ return -EINVAL;
+err_thread:
+ pr_err("%s: hwthread_map thread argument out of range\n", __func__);
+ return -EINVAL;
+}
+early_param("hwthread_map", parse_hwthread_map);
+
+void __init dump_machine_table(void)
+{
+ struct machine_desc *p;
+ const char **compat;
+
+ pr_info("Available machine support:\n\tNAME\t\tCOMPATIBLE LIST\n");
+ for_each_machine_desc(p) {
+ pr_info("\t%s\t[", p->name);
+ for (compat = p->dt_compat; compat && *compat; ++compat)
+ printk(" '%s'", *compat);
+ printk(" ]\n");
+ }
+
+ pr_info("\nPlease check your kernel config and/or bootloader.\n");
+
+ hard_processor_halt(HALT_PANIC);
+}
+
+#ifdef CONFIG_METAG_HALT_ON_PANIC
+static int metag_panic_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ hard_processor_halt(HALT_PANIC);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block metag_panic_block = {
+ metag_panic_event,
+ NULL,
+ 0
+};
+#endif
+
+void __init setup_arch(char **cmdline_p)
+{
+ unsigned long start_pfn;
+ unsigned long text_start = (unsigned long)(&_stext);
+ unsigned long cpu = smp_processor_id();
+ unsigned long heap_start, heap_end;
+ unsigned long start_pte;
+ PTBI _pTBI;
+ PTBISEG p_heap;
+ int heap_id, i;
+
+ metag_cache_probe();
+
+ /* try interpreting the argument as a device tree */
+ machine_desc = setup_machine_fdt(original_cmd_line);
+ /* if it doesn't look like a device tree it must be a command line */
+ if (!machine_desc) {
+#ifdef CONFIG_METAG_BUILTIN_DTB
+ /* try the embedded device tree */
+ machine_desc = setup_machine_fdt(__dtb_start);
+ if (!machine_desc)
+ panic("Invalid embedded device tree.");
+#else
+ /* use the default machine description */
+ machine_desc = default_machine_desc();
+#endif
+#ifndef CONFIG_CMDLINE_FORCE
+ /* append the bootloader cmdline to any builtin fdt cmdline */
+ if (boot_command_line[0] && original_cmd_line[0])
+ strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
+ strlcat(boot_command_line, original_cmd_line,
+ COMMAND_LINE_SIZE);
+#endif
+ }
+ setup_meta_clocks(machine_desc->clocks);
+
+ *cmdline_p = boot_command_line;
+ parse_early_param();
+
+ /*
+ * Make sure we don't alias in dcache or icache
+ */
+ check_for_cache_aliasing(cpu);
+
+
+#ifdef CONFIG_METAG_HALT_ON_PANIC
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &metag_panic_block);
+#endif
+
+#ifdef CONFIG_DUMMY_CONSOLE
+ conswitchp = &dummy_con;
+#endif
+
+ if (!(__core_reg_get(TXSTATUS) & TXSTATUS_PSTAT_BIT))
+ panic("Privilege must be enabled for this thread.");
+
+ _pTBI = __TBI(TBID_ISTAT_BIT);
+
+ per_cpu(pTBI, cpu) = _pTBI;
+
+ if (!per_cpu(pTBI, cpu))
+ panic("No TBI found!");
+
+ /*
+ * Initialize all interrupt vectors to our copy of __TBIUnExpXXX,
+ * rather than the version from the bootloader. This makes call
+ * stacks easier to understand and may allow us to unmap the
+ * bootloader at some point.
+ *
+ * We need to keep the LWK handler that TBI installed in order to
+ * be able to do inter-thread comms.
+ */
+ for (i = 0; i <= TBID_SIGNUM_MAX; i++)
+ if (i != TBID_SIGNUM_LWK)
+ _pTBI->fnSigs[i] = __TBIUnExpXXX;
+
+ /* A Meta requirement is that the kernel is loaded (virtually)
+ * at the PAGE_OFFSET.
+ */
+ if (PAGE_OFFSET != text_start)
+ panic("Kernel not loaded at PAGE_OFFSET (%#x) but at %#lx.",
+ PAGE_OFFSET, text_start);
+
+ start_pte = mmu_read_second_level_page(text_start);
+
+ /*
+ * Kernel pages should have the PRIV bit set by the bootloader.
+ */
+ if (!(start_pte & _PAGE_KERNEL))
+ panic("kernel pte does not have PRIV set");
+
+ /*
+ * See __pa and __va in include/asm/page.h.
+ * This value is negative when running in local space but the
+ * calculations work anyway.
+ */
+ meta_memoffset = text_start - (start_pte & PAGE_MASK);
+
+ /* Now lets look at the heap space */
+ heap_id = (__TBIThreadId() & TBID_THREAD_BITS)
+ + TBID_SEG(0, TBID_SEGSCOPE_LOCAL, TBID_SEGTYPE_HEAP);
+
+ p_heap = __TBIFindSeg(NULL, heap_id);
+
+ if (!p_heap)
+ panic("Could not find heap from TBI!");
+
+ /* The heap begins at the first full page after the kernel data. */
+ heap_start = (unsigned long) &_heap_start;
+
+ /* The heap ends at the end of the heap segment specified with
+ * ldlk.
+ */
+ if (is_global_space(text_start)) {
+ pr_debug("WARNING: running in global space!\n");
+ heap_end = (unsigned long)p_heap->pGAddr + p_heap->Bytes;
+ } else {
+ heap_end = (unsigned long)p_heap->pLAddr + p_heap->Bytes;
+ }
+
+ ROOT_DEV = Root_RAM0;
+
+ /* init_mm is the mm struct used for the first task. It is then
+ * cloned for all other tasks spawned from that task.
+ *
+ * Note - we are using the virtual addresses here.
+ */
+ init_mm.start_code = (unsigned long)(&_stext);
+ init_mm.end_code = (unsigned long)(&_etext);
+ init_mm.end_data = (unsigned long)(&_edata);
+ init_mm.brk = (unsigned long)heap_start;
+
+ min_low_pfn = PFN_UP(__pa(text_start));
+ max_low_pfn = PFN_DOWN(__pa(heap_end));
+
+ pfn_base = min_low_pfn;
+
+ /* Round max_pfn up to a 4Mb boundary. The free_bootmem_node()
+ * call later makes sure to keep the rounded up pages marked reserved.
+ */
+ max_pfn = max_low_pfn + ((1 << MAX_ORDER) - 1);
+ max_pfn &= ~((1 << MAX_ORDER) - 1);
+
+ start_pfn = PFN_UP(__pa(heap_start));
+
+ if (min_low_pfn & ((1 << MAX_ORDER) - 1)) {
+ /* Theoretically, we could expand the space that the
+ * bootmem allocator covers - much as we do for the
+ * 'high' address, and then tell the bootmem system
+ * that the lowest chunk is 'not available'. Right
+ * now it is just much easier to constrain the
+ * user to always MAX_ORDER align their kernel space.
+ */
+
+ panic("Kernel must be %d byte aligned, currently at %#lx.",
+ 1 << (MAX_ORDER + PAGE_SHIFT),
+ min_low_pfn << PAGE_SHIFT);
+ }
+
+#ifdef CONFIG_HIGHMEM
+ highstart_pfn = highend_pfn = max_pfn;
+ high_memory = (void *) __va(PFN_PHYS(highstart_pfn));
+#else
+ high_memory = (void *)__va(PFN_PHYS(max_pfn));
+#endif
+
+ paging_init(heap_end);
+
+ setup_txprivext();
+
+ /* Setup the boot cpu's mapping. The rest will be setup below. */
+ cpu_2_hwthread_id[smp_processor_id()] = hard_processor_id();
+ hwthread_id_2_cpu[hard_processor_id()] = smp_processor_id();
+
+ unflatten_device_tree();
+
+#ifdef CONFIG_SMP
+ smp_init_cpus();
+#endif
+
+ if (machine_desc->init_early)
+ machine_desc->init_early();
+}
+
+static int __init customize_machine(void)
+{
+ /* customizes platform devices, or adds new ones */
+ if (machine_desc->init_machine)
+ machine_desc->init_machine();
+ return 0;
+}
+arch_initcall(customize_machine);
+
+static int __init init_machine_late(void)
+{
+ if (machine_desc->init_late)
+ machine_desc->init_late();
+ return 0;
+}
+late_initcall(init_machine_late);
+
+static const char *get_cpu_capabilities(unsigned int txenable)
+{
+#ifdef CONFIG_METAG_META21
+ /* See CORE_ID in META HTP.GP TRM - Architecture Overview 2.1.238 */
+ int coreid = metag_in32(METAC_CORE_ID);
+ unsigned int dsp_type = (coreid >> 3) & 7;
+ unsigned int fpu_type = (coreid >> 7) & 3;
+
+ switch (dsp_type | fpu_type << 3) {
+ case (0x00): return "EDSP";
+ case (0x01): return "DSP";
+ case (0x08): return "EDSP+LFPU";
+ case (0x09): return "DSP+LFPU";
+ case (0x10): return "EDSP+FPU";
+ case (0x11): return "DSP+FPU";
+ }
+ return "UNKNOWN";
+
+#else
+ if (!(txenable & TXENABLE_CLASS_BITS))
+ return "DSP";
+ else
+ return "";
+#endif
+}
+
+/*
+ * Get CPU information for use by the procfs.
+ */
+#ifdef CONFIG_PROC_FS
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ const char *cpu;
+ unsigned int txenable, thread_id, major, minor;
+ unsigned long clockfreq = get_coreclock();
+#ifdef CONFIG_SMP
+ int i;
+ unsigned long lpj;
+#endif
+
+ cpu = "META";
+
+ asm volatile ("MOV %0,TXENABLE\n" : "=r" (txenable));
+ major = (txenable & TXENABLE_MAJOR_REV_BITS) >> TXENABLE_MAJOR_REV_S;
+ minor = (txenable & TXENABLE_MINOR_REV_BITS) >> TXENABLE_MINOR_REV_S;
+ thread_id = (txenable >> 8) & 0x3;
+
+#ifdef CONFIG_SMP
+ for_each_online_cpu(i) {
+ lpj = per_cpu(cpu_data, i).loops_per_jiffy;
+ txenable = core_reg_read(TXUCT_ID, TXENABLE_REGNUM,
+ cpu_2_hwthread_id[i]);
+
+ seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n"
+ "Clocking:\t%lu.%1luMHz\n"
+ "BogoMips:\t%lu.%02lu\n"
+ "Calibration:\t%lu loops\n"
+ "Capabilities:\t%s\n\n",
+ cpu, major, minor, i,
+ clockfreq / 1000000, (clockfreq / 100000) % 10,
+ lpj / (500000 / HZ), (lpj / (5000 / HZ)) % 100,
+ lpj,
+ get_cpu_capabilities(txenable));
+ }
+#else
+ seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n"
+ "Clocking:\t%lu.%1luMHz\n"
+ "BogoMips:\t%lu.%02lu\n"
+ "Calibration:\t%lu loops\n"
+ "Capabilities:\t%s\n",
+ cpu, major, minor, thread_id,
+ clockfreq / 1000000, (clockfreq / 100000) % 10,
+ loops_per_jiffy / (500000 / HZ),
+ (loops_per_jiffy / (5000 / HZ)) % 100,
+ loops_per_jiffy,
+ get_cpu_capabilities(txenable));
+#endif /* CONFIG_SMP */
+
+#ifdef CONFIG_METAG_L2C
+ if (meta_l2c_is_present()) {
+ seq_printf(m, "L2 cache:\t%s\n"
+ "L2 cache size:\t%d KB\n",
+ meta_l2c_is_enabled() ? "enabled" : "disabled",
+ meta_l2c_size() >> 10);
+ }
+#endif
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return (void *)(*pos == 0);
+}
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ return NULL;
+}
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+const struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_cpuinfo,
+};
+#endif /* CONFIG_PROC_FS */
+
+void __init metag_start_kernel(char *args)
+{
+ /* Zero the timer register so timestamps are from the point at
+ * which the kernel started running.
+ */
+ __core_reg_set(TXTIMER, 0);
+
+ /* Clear the bss. */
+ memset(__bss_start, 0,
+ (unsigned long)__bss_stop - (unsigned long)__bss_start);
+
+ /* Remember where these are for use in setup_arch */
+ original_cmd_line = args;
+
+ current_thread_info()->cpu = hard_processor_id();
+
+ start_kernel();
+}
+
+/*
+ * Setup TXPRIVEXT register to be prevent userland from touching our
+ * precious registers.
+ */
+void setup_txprivext(void)
+{
+ __core_reg_set(TXPRIVEXT, PRIV_BITS);
+}
+
+PTBI pTBI_get(unsigned int cpu)
+{
+ return per_cpu(pTBI, cpu);
+}
+
+#if defined(CONFIG_METAG_DSP) && defined(CONFIG_METAG_FPU)
+char capabilites[] = "dsp fpu";
+#elif defined(CONFIG_METAG_DSP)
+char capabilites[] = "dsp";
+#elif defined(CONFIG_METAG_FPU)
+char capabilites[] = "fpu";
+#else
+char capabilites[] = "";
+#endif
+
+static struct ctl_table caps_kern_table[] = {
+ {
+ .procname = "capabilities",
+ .data = capabilites,
+ .maxlen = sizeof(capabilites),
+ .mode = 0444,
+ .proc_handler = proc_dostring,
+ },
+ {}
+};
+
+static struct ctl_table caps_root_table[] = {
+ {
+ .procname = "kernel",
+ .mode = 0555,
+ .child = caps_kern_table,
+ },
+ {}
+};
+
+static int __init capabilities_register_sysctl(void)
+{
+ struct ctl_table_header *caps_table_header;
+
+ caps_table_header = register_sysctl_table(caps_root_table);
+ if (!caps_table_header) {
+ pr_err("Unable to register CAPABILITIES sysctl\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+core_initcall(capabilities_register_sysctl);
--
1.7.7.6



\
 
 \ /
  Last update: 2013-01-10 17:42    [W:0.241 / U:3.664 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site