diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-09-21 12:51:27 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-09-21 12:51:42 +0200 |
commit | ae82bfd61ca7e57cc2d914add9ab0873e260f2f5 (patch) | |
tree | a7f862ad8b0ae4f2e8953e6aa613eb702b484ecf /arch/sh/mm/kmap.c | |
parent | cd74c86bdf705f824d494a2bbda393d1d562b40a (diff) | |
parent | ebc79c4f8da0f92efa968e0328f32334a2ce80cf (diff) |
Merge branch 'linus' into perfcounters/rename
Merge reason: pull in all the latest code before doing the rename.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/sh/mm/kmap.c')
-rw-r--r-- | arch/sh/mm/kmap.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c new file mode 100644 index 00000000000..16e01b5fed0 --- /dev/null +++ b/arch/sh/mm/kmap.c @@ -0,0 +1,65 @@ +/* + * arch/sh/mm/kmap.c + * + * Copyright (C) 1999, 2000, 2002 Niibe Yutaka + * Copyright (C) 2002 - 2009 Paul Mundt + * + * Released under the terms of the GNU GPL v2.0. + */ +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/fs.h> +#include <linux/highmem.h> +#include <linux/module.h> +#include <asm/mmu_context.h> +#include <asm/cacheflush.h> + +#define kmap_get_fixmap_pte(vaddr) \ + pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) + +static pte_t *kmap_coherent_pte; + +void __init kmap_coherent_init(void) +{ + unsigned long vaddr; + + /* cache the first coherent kmap pte */ + vaddr = __fix_to_virt(FIX_CMAP_BEGIN); + kmap_coherent_pte = kmap_get_fixmap_pte(vaddr); +} + +void *kmap_coherent(struct page *page, unsigned long addr) +{ + enum fixed_addresses idx; + unsigned long vaddr; + + BUG_ON(test_bit(PG_dcache_dirty, &page->flags)); + + pagefault_disable(); + + idx = FIX_CMAP_END - + ((addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT); + vaddr = __fix_to_virt(idx); + + BUG_ON(!pte_none(*(kmap_coherent_pte - idx))); + set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL)); + + return (void *)vaddr; +} + +void kunmap_coherent(void *kvaddr) +{ + if (kvaddr >= (void *)FIXADDR_START) { + unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK; + enum fixed_addresses idx = __virt_to_fix(vaddr); + + /* XXX.. Kill this later, here for sanity at the moment.. */ + __flush_purge_region((void *)vaddr, PAGE_SIZE); + + pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx); + local_flush_tlb_one(get_asid(), vaddr); + } + + pagefault_enable(); +} |