arch/mips/mm/cache.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
   7  * Copyright (C) 2007 MIPS Technologies, Inc.
   8  */
   9 #include <linux/fs.h>
  10 #include <linux/fcntl.h>
  11 #include <linux/kernel.h>
  12 #include <linux/linkage.h>
  13 #include <linux/export.h>
  14 #include <linux/sched.h>
  15 #include <linux/syscalls.h>
  16 #include <linux/mm.h>
  17
  18 #include <asm/cacheflush.h>
  19 #include <asm/highmem.h>
  20 #include <asm/processor.h>
  21 #include <asm/cpu.h>
  22 #include <asm/cpu-features.h>
  23 #include <asm/setup.h>
  24
  25 /* Cache operations. */
  26 void (*flush_cache_all)(void);
  27 void (*__flush_cache_all)(void);
  28 EXPORT_SYMBOL_GPL(__flush_cache_all);
  29 void (*flush_cache_mm)(struct mm_struct *mm);
  30 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
  31         unsigned long end);
  32 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
  33         unsigned long pfn);
  34 void (*flush_icache_range)(unsigned long start, unsigned long end);
  35 EXPORT_SYMBOL_GPL(flush_icache_range);
  36 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
  37 EXPORT_SYMBOL_GPL(local_flush_icache_range);
  38 void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
  39 EXPORT_SYMBOL_GPL(__flush_icache_user_range);
  40 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
  41 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
  42
  43 void (*__flush_cache_vmap)(void);
  44 void (*__flush_cache_vunmap)(void);
  45
  46 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
  47 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
  48
  49 /* MIPS specific cache operations */
  50 void (*local_flush_data_cache_page)(void * addr);
  51 void (*flush_data_cache_page)(unsigned long addr);
  52 void (*flush_icache_all)(void);
  53
  54 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
  55 EXPORT_SYMBOL(flush_data_cache_page);
  56 EXPORT_SYMBOL(flush_icache_all);
  57
  58 #ifdef CONFIG_DMA_NONCOHERENT
  59
  60 /* DMA cache operations. */
  61 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
  62 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
  63 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
  64
  65 EXPORT_SYMBOL(_dma_cache_wback_inv);
  66
  67 #endif /* CONFIG_DMA_NONCOHERENT */
  68
  69 /*
  70  * We could optimize the case where the cache argument is not BCACHE but
  71  * that seems very atypical use ...
  72  */
  73 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
  74         unsigned int, cache)
  75 {
  76         if (bytes == 0)
  77                 return 0;
  78         if (!access_ok((void __user *) addr, bytes))
  79                 return -EFAULT;
  80
  81         __flush_icache_user_range(addr, addr + bytes);
  82
  83         return 0;
  84 }
  85
  86 void __flush_dcache_page(struct page *page)
  87 {
  88         struct address_space *mapping = page_mapping_file(page);
  89         unsigned long addr;
  90
  91         if (mapping && !mapping_mapped(mapping)) {
  92                 SetPageDcacheDirty(page);
  93                 return;
  94         }
  95
  96         /*
  97          * We could delay the flush for the !page_mapping case too.  But that
  98          * case is for exec env/arg pages and those are %99 certainly going to
  99          * get faulted into the tlb (and thus flushed) anyways.
 100          */
 101         if (PageHighMem(page))
 102                 addr = (unsigned long)kmap_atomic(page);
 103         else
 104                 addr = (unsigned long)page_address(page);
 105
 106         flush_data_cache_page(addr);
 107
 108         if (PageHighMem(page))
 109                 __kunmap_atomic((void *)addr);
 110 }
 111
 112 EXPORT_SYMBOL(__flush_dcache_page);
 113
 114 void __flush_anon_page(struct page *page, unsigned long vmaddr)
 115 {
 116         unsigned long addr = (unsigned long) page_address(page);
 117
 118         if (pages_do_alias(addr, vmaddr)) {
 119                 if (page_mapcount(page) && !Page_dcache_dirty(page)) {
 120                         void *kaddr;
 121
 122                         kaddr = kmap_coherent(page, vmaddr);
 123                         flush_data_cache_page((unsigned long)kaddr);
 124                         kunmap_coherent();
 125                 } else
 126                         flush_data_cache_page(addr);
 127         }
 128 }
 129
 130 EXPORT_SYMBOL(__flush_anon_page);
 131
 132 void __update_cache(unsigned long address, pte_t pte)
 133 {
 134         struct page *page;
 135         unsigned long pfn, addr;
 136         int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
 137
 138         pfn = pte_pfn(pte);
 139         if (unlikely(!pfn_valid(pfn)))
 140                 return;
 141         page = pfn_to_page(pfn);
 142         if (Page_dcache_dirty(page)) {
 143                 if (PageHighMem(page))
 144                         addr = (unsigned long)kmap_atomic(page);
 145                 else
 146                         addr = (unsigned long)page_address(page);
 147
 148                 if (exec || pages_do_alias(addr, address & PAGE_MASK))
 149                         flush_data_cache_page(addr);
 150
 151                 if (PageHighMem(page))
 152                         __kunmap_atomic((void *)addr);
 153
 154                 ClearPageDcacheDirty(page);
 155         }
 156 }
 157
 158 unsigned long _page_cachable_default;
 159 EXPORT_SYMBOL(_page_cachable_default);
 160
 161 static inline void setup_protection_map(void)
 162 {
 163         if (cpu_has_rixi) {
 164                 protection_map[0]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
 165                 protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
 166                 protection_map[2]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
 167                 protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
 168                 protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 169                 protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 170                 protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 171                 protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 172
 173                 protection_map[8]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
 174                 protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
 175                 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
 176                 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
 177                 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 178                 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 179                 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
 180                 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
 181
 182         } else {
 183                 protection_map[0] = PAGE_NONE;
 184                 protection_map[1] = PAGE_READONLY;
 185                 protection_map[2] = PAGE_COPY;
 186                 protection_map[3] = PAGE_COPY;
 187                 protection_map[4] = PAGE_READONLY;
 188                 protection_map[5] = PAGE_READONLY;
 189                 protection_map[6] = PAGE_COPY;
 190                 protection_map[7] = PAGE_COPY;
 191                 protection_map[8] = PAGE_NONE;
 192                 protection_map[9] = PAGE_READONLY;
 193                 protection_map[10] = PAGE_SHARED;
 194                 protection_map[11] = PAGE_SHARED;
 195                 protection_map[12] = PAGE_READONLY;
 196                 protection_map[13] = PAGE_READONLY;
 197                 protection_map[14] = PAGE_SHARED;
 198                 protection_map[15] = PAGE_SHARED;
 199         }
 200 }
 201
 202 void cpu_cache_init(void)
 203 {
 204         if (cpu_has_3k_cache) {
 205                 extern void __weak r3k_cache_init(void);
 206
 207                 r3k_cache_init();
 208         }
 209         if (cpu_has_6k_cache) {
 210                 extern void __weak r6k_cache_init(void);
 211
 212                 r6k_cache_init();
 213         }
 214         if (cpu_has_4k_cache) {
 215                 extern void __weak r4k_cache_init(void);
 216
 217                 r4k_cache_init();
 218         }
 219         if (cpu_has_8k_cache) {
 220                 extern void __weak r8k_cache_init(void);
 221
 222                 r8k_cache_init();
 223         }
 224         if (cpu_has_tx39_cache) {
 225                 extern void __weak tx39_cache_init(void);
 226
 227                 tx39_cache_init();
 228         }
 229
 230         if (cpu_has_octeon_cache) {
 231                 extern void __weak octeon_cache_init(void);
 232
 233                 octeon_cache_init();
 234         }
 235
 236         setup_protection_map();
 237 }
 238
 239 int __weak __uncached_access(struct file *file, unsigned long addr)
 240 {
 241         if (file->f_flags & O_DSYNC)
 242                 return 1;
 243
 244         return addr >= __pa(high_memory);
 245 }