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    SubjectRe: sparc32 sunrpc.o
    >    From: Tomas Szepe <szepe@pinerecords.com>
    > Date: Sat, 28 Sep 2002 18:13:16 +0200
    >
    > > Ok, DaveM, could you have a look at this patch?
    >
    > Please disregard, highmem.c unreasonably included linux/highmem.h.
    > I'll be looking into this some more.
    >
    > Let us know when new working patch is available :-)

    Right. :)
    This took a bit longer cos I had to leave for the night.

    Patch against 2.4.20-pre8.

    T.


    diff -urN 2.4.20-pre8.vanilla/arch/sparc/kernel/sparc_ksyms.c linux-2.4.20-pre8/arch/sparc/kernel/sparc_ksyms.c
    --- 2.4.20-pre8.vanilla/arch/sparc/kernel/sparc_ksyms.c 2002-08-03 06:12:08.000000000 +0200
    +++ linux-2.4.20-pre8/arch/sparc/kernel/sparc_ksyms.c 2002-09-29 11:45:33.000000000 +0200
    @@ -46,6 +46,9 @@
    #include <asm/sbus.h>
    #include <asm/dma.h>
    #endif
    +#ifdef CONFIG_HIGHMEM
    +#include <asm/highmem.h>
    +#endif
    #include <asm/a.out.h>
    #include <asm/io-unit.h>

    @@ -204,6 +207,12 @@
    EXPORT_SYMBOL(pci_dma_sync_single);
    #endif

    +/* in arch/sparc/mm/highmem.c */
    +#ifdef CONFIG_HIGHMEM
    +EXPORT_SYMBOL(kmap_atomic);
    +EXPORT_SYMBOL(kunmap_atomic);
    +#endif
    +
    /* Solaris/SunOS binary compatibility */
    EXPORT_SYMBOL(svr4_setcontext);
    EXPORT_SYMBOL(svr4_getcontext);
    diff -urN 2.4.20-pre8.vanilla/arch/sparc/mm/Makefile linux-2.4.20-pre8/arch/sparc/mm/Makefile
    --- 2.4.20-pre8.vanilla/arch/sparc/mm/Makefile 2000-12-29 23:07:21.000000000 +0100
    +++ linux-2.4.20-pre8/arch/sparc/mm/Makefile 2002-09-29 11:45:33.000000000 +0200
    @@ -11,7 +11,7 @@
    $(CC) $(AFLAGS) -ansi -c -o $*.o $<

    O_TARGET := mm.o
    -obj-y := fault.o init.o loadmmu.o generic.o extable.o btfixup.o
    +obj-y := fault.o init.o loadmmu.o generic.o extable.o highmem.o btfixup.o

    ifeq ($(CONFIG_SUN4),y)
    obj-y += nosrmmu.o
    diff -urN 2.4.20-pre8.vanilla/arch/sparc/mm/highmem.c linux-2.4.20-pre8/arch/sparc/mm/highmem.c
    --- 2.4.20-pre8.vanilla/arch/sparc/mm/highmem.c 1970-01-01 01:00:00.000000000 +0100
    +++ linux-2.4.20-pre8/arch/sparc/mm/highmem.c 2002-09-29 11:46:38.000000000 +0200
    @@ -0,0 +1,84 @@
    +/*
    + * highmem.c: virtual kernel memory mappings for high memory
    + *
    + * Provides kernel-static versions of atomic kmap functions originally
    + * found as inlines in include/asm-sparc/highmem.h. These became
    + * needed as kmap_atomic() and kunmap_atomic() started getting
    + * called from within modules.
    + * -- Tomas Szepe <szepe@pinerecords.com>, September 2002
    + */
    +
    +#include <linux/mm.h>
    +#include <asm/highmem.h>
    +#include <asm/pgalloc.h>
    +
    +/*
    + * The use of kmap_atomic/kunmap_atomic is discouraged -- kmap()/kunmap()
    + * gives a more generic (and caching) interface. But kmap_atomic() can
    + * be used in IRQ contexts, so in some (very limited) cases we need it.
    + */
    +void *kmap_atomic(struct page *page, enum km_type type)
    +{
    + unsigned long idx;
    + unsigned long vaddr;
    +
    + if (page < highmem_start_page)
    + return page_address(page);
    +
    + idx = type + KM_TYPE_NR * smp_processor_id();
    + vaddr = fix_kmap_begin + idx * PAGE_SIZE;
    +
    +/* XXX Fix - Anton */
    +#if 0
    + __flush_cache_one(vaddr);
    +#else
    + flush_cache_all();
    +#endif
    +
    +#if HIGHMEM_DEBUG
    + if (!pte_none(*(kmap_pte + idx)))
    + BUG();
    +#endif
    + set_pte(kmap_pte + idx, mk_pte(page, kmap_prot));
    +/* XXX Fix - Anton */
    +#if 0
    + __flush_tlb_one(vaddr);
    +#else
    + flush_tlb_all();
    +#endif
    +
    + return (void *) vaddr;
    +}
    +
    +void kunmap_atomic(void *kvaddr, enum km_type type)
    +{
    + unsigned long vaddr = (unsigned long) kvaddr;
    + unsigned long idx = type + KM_TYPE_NR * smp_processor_id();
    +
    + if (vaddr < fix_kmap_begin) /* FIXME */
    + return;
    +
    + if (vaddr != fix_kmap_begin + idx * PAGE_SIZE)
    + BUG();
    +
    +/* XXX Fix - Anton */
    +#if 0
    + __flush_cache_one(vaddr);
    +#else
    + flush_cache_all();
    +#endif
    +
    +#ifdef HIGHMEM_DEBUG
    + /*
    + * Force other mappings to oops if they try to access
    + * this pte without first remapping it.
    + */
    + pte_clear(kmap_pte + idx);
    +/* XXX Fix - Anton */
    +#if 0
    + __flush_tlb_one(vaddr);
    +#else
    + flush_tlb_all();
    +#endif
    +#endif
    +}
    diff -urN 2.4.20-pre8.vanilla/include/asm-sparc/highmem.h linux-2.4.20-pre8/include/asm-sparc/highmem.h
    --- 2.4.20-pre8.vanilla/include/asm-sparc/highmem.h 2002-09-29 11:36:45.000000000 +0200
    +++ linux-2.4.20-pre8/include/asm-sparc/highmem.h 2002-09-29 11:48:13.000000000 +0200
    @@ -29,6 +29,13 @@
    /* undef for production */
    #define HIGHMEM_DEBUG 1

    +/* in mm/highmem.c */
    +extern void *kmap_high(struct page *page);
    +extern void kunmap_high(struct page *page);
    +
    +/* in mm/memory.c */
    +extern struct page *highmem_start_page;
    +
    /* declarations for highmem.c */
    extern unsigned long highstart_pfn, highend_pfn;

    @@ -51,12 +58,13 @@
    */
    #define LAST_PKMAP 1024

    -#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
    -#define PKMAP_NR(virt) ((virt - pkmap_base) >> PAGE_SHIFT)
    -#define PKMAP_ADDR(nr) (pkmap_base + ((nr) << PAGE_SHIFT))
    -
    -extern void *kmap_high(struct page *page);
    -extern void kunmap_high(struct page *page);
    +#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
    +#define PKMAP_NR(virt) ((virt - pkmap_base) >> PAGE_SHIFT)
    +#define PKMAP_ADDR(nr) (pkmap_base + ((nr) << PAGE_SHIFT))
    +
    +/* in arch/sparc/mm/highmem.c */
    +void *kmap_atomic(struct page *page, enum km_type type);
    +void kunmap_atomic(void *kvaddr, enum km_type type);

    static inline void *kmap(struct page *page)
    {
    @@ -76,78 +84,6 @@
    kunmap_high(page);
    }

    -/*
    - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
    - * gives a more generic (and caching) interface. But kmap_atomic can
    - * be used in IRQ contexts, so in some (very limited) cases we need
    - * it.
    - */
    -static inline void *kmap_atomic(struct page *page, enum km_type type)
    -{
    - unsigned long idx;
    - unsigned long vaddr;
    -
    - if (page < highmem_start_page)
    - return page_address(page);
    -
    - idx = type + KM_TYPE_NR*smp_processor_id();
    - vaddr = fix_kmap_begin + idx * PAGE_SIZE;
    -
    -/* XXX Fix - Anton */
    -#if 0
    - __flush_cache_one(vaddr);
    -#else
    - flush_cache_all();
    -#endif
    -
    -#if HIGHMEM_DEBUG
    - if (!pte_none(*(kmap_pte+idx)))
    - BUG();
    -#endif
    - set_pte(kmap_pte+idx, mk_pte(page, kmap_prot));
    -/* XXX Fix - Anton */
    -#if 0
    - __flush_tlb_one(vaddr);
    -#else
    - flush_tlb_all();
    -#endif
    -
    - return (void*) vaddr;
    -}
    -
    -static inline void kunmap_atomic(void *kvaddr, enum km_type type)
    -{
    - unsigned long vaddr = (unsigned long) kvaddr;
    - unsigned long idx = type + KM_TYPE_NR*smp_processor_id();
    -
    - if (vaddr < fix_kmap_begin) // FIXME
    - return;
    -
    - if (vaddr != fix_kmap_begin + idx * PAGE_SIZE)
    - BUG();
    -
    -/* XXX Fix - Anton */
    -#if 0
    - __flush_cache_one(vaddr);
    -#else
    - flush_cache_all();
    -#endif
    -
    -#ifdef HIGHMEM_DEBUG
    - /*
    - * force other mappings to Oops if they'll try to access
    - * this pte without first remap it
    - */
    - pte_clear(kmap_pte+idx);
    -/* XXX Fix - Anton */
    -#if 0
    - __flush_tlb_one(vaddr);
    -#else
    - flush_tlb_all();
    -#endif
    -#endif
    -}
    -
    #endif /* __KERNEL__ */

    #endif /* _ASM_HIGHMEM_H */
    -
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