arch/arm/mm/cache-v3.S

   1 /*
   2  *  linux/arch/arm/mm/cache-v3.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(v3_flush_icache_all)
  21         mov     pc, lr
  22 ENDPROC(v3_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(v3_flush_user_cache_all)
  33         /* FALLTHROUGH */
  34 /*
  35  *      flush_kern_cache_all()
  36  *
  37  *      Clean and invalidate the entire cache.
  38  */
  39 ENTRY(v3_flush_kern_cache_all)
  40         /* FALLTHROUGH */
  41
  42 /*
  43  *      flush_user_cache_range(start, end, flags)
  44  *
  45  *      Invalidate a range of cache entries in the specified
  46  *      address space.
  47  *
  48  *      - start - start address (may not be aligned)
  49  *      - end   - end address (exclusive, may not be aligned)
  50  *      - flags - vma_area_struct flags describing address space
  51  */
  52 ENTRY(v3_flush_user_cache_range)
  53         mov     ip, #0
  54         mcreq   p15, 0, ip, c7, c0, 0           @ flush ID cache
  55         mov     pc, lr
  56
  57 /*
  58  *      coherent_kern_range(start, end)
  59  *
  60  *      Ensure coherency between the Icache and the Dcache in the
  61  *      region described by start.  If you have non-snooping
  62  *      Harvard caches, you need to implement this function.
  63  *
  64  *      - start  - virtual start address
  65  *      - end    - virtual end address
  66  */
  67 ENTRY(v3_coherent_kern_range)
  68         /* FALLTHROUGH */
  69
  70 /*
  71  *      coherent_user_range(start, end)
  72  *
  73  *      Ensure coherency between the Icache and the Dcache in the
  74  *      region described by start.  If you have non-snooping
  75  *      Harvard caches, you need to implement this function.
  76  *
  77  *      - start  - virtual start address
  78  *      - end    - virtual end address
  79  */
  80 ENTRY(v3_coherent_user_range)
  81         mov     r0, #0
  82         mov     pc, lr
  83
  84 /*
  85  *      flush_kern_dcache_area(void *page, size_t size)
  86  *
  87  *      Ensure no D cache aliasing occurs, either with itself or
  88  *      the I cache
  89  *
  90  *      - addr  - kernel address
  91  *      - size  - region size
  92  */
  93 ENTRY(v3_flush_kern_dcache_area)
  94         /* FALLTHROUGH */
  95
  96 /*
  97  *      dma_flush_range(start, end)
  98  *
  99  *      Clean and invalidate the specified virtual address range.
 100  *
 101  *      - start  - virtual start address
 102  *      - end    - virtual end address
 103  */
 104 ENTRY(v3_dma_flush_range)
 105         mov     r0, #0
 106         mcr     p15, 0, r0, c7, c0, 0           @ flush ID cache
 107         mov     pc, lr
 108
 109 /*
 110  *      dma_unmap_area(start, size, dir)
 111  *      - start - kernel virtual start address
 112  *      - size  - size of region
 113  *      - dir   - DMA direction
 114  */
 115 ENTRY(v3_dma_unmap_area)
 116         teq     r2, #DMA_TO_DEVICE
 117         bne     v3_dma_flush_range
 118         /* FALLTHROUGH */
 119
 120 /*
 121  *      dma_map_area(start, size, dir)
 122  *      - start - kernel virtual start address
 123  *      - size  - size of region
 124  *      - dir   - DMA direction
 125  */
 126 ENTRY(v3_dma_map_area)
 127         mov     pc, lr
 128 ENDPROC(v3_dma_unmap_area)
 129 ENDPROC(v3_dma_map_area)
 130
 131         .globl  v3_flush_kern_cache_louis
 132         .equ    v3_flush_kern_cache_louis, v3_flush_kern_cache_all
 133
 134         __INITDATA
 135
 136         @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
 137         define_cache_functions v3