arch/arm/mm/cache-v4.S

   1 /*
   2  *  linux/arch/arm/mm/cache-v4.S
   3  *
   4  *  Copyright (C) 1997-2002 Russell king
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/linkage.h>
  11 #include <linux/init.h>
  12 #include <asm/page.h>
  13 #include "proc-macros.S"
  14
  15 /*
  16  *      flush_icache_all()
  17  *
  18  *      Unconditionally clean and invalidate the entire icache.
  19  */
  20 ENTRY(v4_flush_icache_all)
  21         mov     pc, lr
  22 ENDPROC(v4_flush_icache_all)
  23
  24 /*
  25  *      flush_user_cache_all()
  26  *
  27  *      Invalidate all cache entries in a particular address
  28  *      space.
  29  *
  30  *      - mm    - mm_struct describing address space
  31  */
  32 ENTRY(v4_flush_user_cache_all)
  33         /* FALLTHROUGH */
  34 /*
  35  *      flush_kern_cache_all()
  36  *
  37  *      Clean and invalidate the entire cache.
  38  */
  39 ENTRY(v4_flush_kern_cache_all)
  40 #ifdef CONFIG_CPU_CP15
  41         mov     r0, #0
  42         mcr     p15, 0, r0, c7, c7, 0           @ flush ID cache
  43         mov     pc, lr
  44 #else
  45         /* FALLTHROUGH */
  46 #endif
  47
  48 /*
  49  *      flush_user_cache_range(start, end, flags)
  50  *
  51  *      Invalidate a range of cache entries in the specified
  52  *      address space.
  53  *
  54  *      - start - start address (may not be aligned)
  55  *      - end   - end address (exclusive, may not be aligned)
  56  *      - flags - vma_area_struct flags describing address space
  57  */
  58 ENTRY(v4_flush_user_cache_range)
  59 #ifdef CONFIG_CPU_CP15
  60         mov     ip, #0
  61         mcr     p15, 0, ip, c7, c7, 0           @ flush ID cache
  62         mov     pc, lr
  63 #else
  64         /* FALLTHROUGH */
  65 #endif
  66
  67 /*
  68  *      coherent_kern_range(start, end)
  69  *
  70  *      Ensure coherency between the Icache and the Dcache in the
  71  *      region described by start.  If you have non-snooping
  72  *      Harvard caches, you need to implement this function.
  73  *
  74  *      - start  - virtual start address
  75  *      - end    - virtual end address
  76  */
  77 ENTRY(v4_coherent_kern_range)
  78         /* FALLTHROUGH */
  79
  80 /*
  81  *      coherent_user_range(start, end)
  82  *
  83  *      Ensure coherency between the Icache and the Dcache in the
  84  *      region described by start.  If you have non-snooping
  85  *      Harvard caches, you need to implement this function.
  86  *
  87  *      - start  - virtual start address
  88  *      - end    - virtual end address
  89  */
  90 ENTRY(v4_coherent_user_range)
  91         mov     r0, #0
  92         mov     pc, lr
  93
  94 /*
  95  *      flush_kern_dcache_area(void *addr, size_t size)
  96  *
  97  *      Ensure no D cache aliasing occurs, either with itself or
  98  *      the I cache
  99  *
 100  *      - addr  - kernel address
 101  *      - size  - region size
 102  */
 103 ENTRY(v4_flush_kern_dcache_area)
 104         /* FALLTHROUGH */
 105
 106 /*
 107  *      dma_flush_range(start, end)
 108  *
 109  *      Clean and invalidate the specified virtual address range.
 110  *
 111  *      - start  - virtual start address
 112  *      - end    - virtual end address
 113  */
 114 ENTRY(v4_dma_flush_range)
 115 #ifdef CONFIG_CPU_CP15
 116         mov     r0, #0
 117         mcr     p15, 0, r0, c7, c7, 0           @ flush ID cache
 118 #endif
 119         mov     pc, lr
 120
 121 /*
 122  *      dma_unmap_area(start, size, dir)
 123  *      - start - kernel virtual start address
 124  *      - size  - size of region
 125  *      - dir   - DMA direction
 126  */
 127 ENTRY(v4_dma_unmap_area)
 128         teq     r2, #DMA_TO_DEVICE
 129         bne     v4_dma_flush_range
 130         /* FALLTHROUGH */
 131
 132 /*
 133  *      dma_map_area(start, size, dir)
 134  *      - start - kernel virtual start address
 135  *      - size  - size of region
 136  *      - dir   - DMA direction
 137  */
 138 ENTRY(v4_dma_map_area)
 139         mov     pc, lr
 140 ENDPROC(v4_dma_unmap_area)
 141 ENDPROC(v4_dma_map_area)
 142
 143         .globl  v4_flush_kern_cache_louis
 144         .equ    v4_flush_kern_cache_louis, v4_flush_kern_cache_all
 145
 146         __INITDATA
 147
 148         @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
 149         define_cache_functions v4