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Linux/arch/sh/mm/kmap.c

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  1 /*
  2  * arch/sh/mm/kmap.c
  3  *
  4  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
  5  * Copyright (C) 2002 - 2009  Paul Mundt
  6  *
  7  * Released under the terms of the GNU GPL v2.0.
  8  */
  9 #include <linux/mm.h>
 10 #include <linux/init.h>
 11 #include <linux/mutex.h>
 12 #include <linux/fs.h>
 13 #include <linux/highmem.h>
 14 #include <linux/module.h>
 15 #include <asm/mmu_context.h>
 16 #include <asm/cacheflush.h>
 17 
 18 #define kmap_get_fixmap_pte(vaddr)                                     \
 19         pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
 20 
 21 static pte_t *kmap_coherent_pte;
 22 
 23 void __init kmap_coherent_init(void)
 24 {
 25         unsigned long vaddr;
 26 
 27         /* cache the first coherent kmap pte */
 28         vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
 29         kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
 30 }
 31 
 32 void *kmap_coherent(struct page *page, unsigned long addr)
 33 {
 34         enum fixed_addresses idx;
 35         unsigned long vaddr;
 36 
 37         BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
 38 
 39         pagefault_disable();
 40 
 41         idx = FIX_CMAP_END -
 42                 (((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
 43                  (FIX_N_COLOURS * smp_processor_id()));
 44 
 45         vaddr = __fix_to_virt(idx);
 46 
 47         BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
 48         set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
 49 
 50         return (void *)vaddr;
 51 }
 52 
 53 void kunmap_coherent(void *kvaddr)
 54 {
 55         if (kvaddr >= (void *)FIXADDR_START) {
 56                 unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
 57                 enum fixed_addresses idx = __virt_to_fix(vaddr);
 58 
 59                 /* XXX.. Kill this later, here for sanity at the moment.. */
 60                 __flush_purge_region((void *)vaddr, PAGE_SIZE);
 61 
 62                 pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
 63                 local_flush_tlb_one(get_asid(), vaddr);
 64         }
 65 
 66         pagefault_enable();
 67 }
 68 

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