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 (*flush_cache_sigtramp)(unsigned long addr);
  51 void (*local_flush_data_cache_page)(void * addr);
  52 void (*flush_data_cache_page)(unsigned long addr);
  53 void (*flush_icache_all)(void);
  54
  55 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
  56 EXPORT_SYMBOL(flush_data_cache_page);
  57 EXPORT_SYMBOL(flush_icache_all);
  58
  59 #if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
  60
  61 /* DMA cache operations. */
  62 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
  63 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
  64 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
  65
  66 EXPORT_SYMBOL(_dma_cache_wback_inv);
  67
  68 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
  69
  70 /*
  71  * We could optimize the case where the cache argument is not BCACHE but
  72  * that seems very atypical use ...
  73  */
  74 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
  75         unsigned int, cache)
  76 {
  77         if (bytes == 0)
  78                 return 0;
  79         if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
  80                 return -EFAULT;
  81
  82         __flush_icache_user_range(addr, addr + bytes);
  83
  84         return 0;
  85 }
  86
  87 void __flush_dcache_page(struct page *page)
  88 {
  89         struct address_space *mapping = page_mapping(page);
  90         unsigned long addr;
  91
  92         if (mapping && !mapping_mapped(mapping)) {
  93                 SetPageDcacheDirty(page);
  94                 return;
  95         }
  96
  97         /*
  98          * We could delay the flush for the !page_mapping case too.  But that
  99          * case is for exec env/arg pages and those are %99 certainly going to
 100          * get faulted into the tlb (and thus flushed) anyways.
 101          */
 102         if (PageHighMem(page))
 103                 addr = (unsigned long)kmap_atomic(page);
 104         else
 105                 addr = (unsigned long)page_address(page);
 106
 107         flush_data_cache_page(addr);
 108
 109         if (PageHighMem(page))
 110                 __kunmap_atomic((void *)addr);
 111 }
 112
 113 EXPORT_SYMBOL(__flush_dcache_page);
 114
 115 void __flush_anon_page(struct page *page, unsigned long vmaddr)
 116 {
 117         unsigned long addr = (unsigned long) page_address(page);
 118
 119         if (pages_do_alias(addr, vmaddr)) {
 120                 if (page_mapcount(page) && !Page_dcache_dirty(page)) {
 121                         void *kaddr;
 122
 123                         kaddr = kmap_coherent(page, vmaddr);
 124                         flush_data_cache_page((unsigned long)kaddr);
 125                         kunmap_coherent();
 126                 } else
 127                         flush_data_cache_page(addr);
 128         }
 129 }
 130
 131 EXPORT_SYMBOL(__flush_anon_page);
 132
 133 void __update_cache(unsigned long address, pte_t pte)
 134 {
 135         struct page *page;
 136         unsigned long pfn, addr;
 137         int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
 138
 139         pfn = pte_pfn(pte);
 140         if (unlikely(!pfn_valid(pfn)))
 141                 return;
 142         page = pfn_to_page(pfn);
 143         if (Page_dcache_dirty(page)) {
 144                 if (PageHighMem(page))
 145                         addr = (unsigned long)kmap_atomic(page);
 146                 else
 147                         addr = (unsigned long)page_address(page);
 148
 149                 if (exec || pages_do_alias(addr, address & PAGE_MASK))
 150                         flush_data_cache_page(addr);
 151
 152                 if (PageHighMem(page))
 153                         __kunmap_atomic((void *)addr);
 154
 155                 ClearPageDcacheDirty(page);
 156         }
 157 }
 158
 159 unsigned long _page_cachable_default;
 160 EXPORT_SYMBOL(_page_cachable_default);
 161
 162 static inline void setup_protection_map(void)
 163 {
 164         if (cpu_has_rixi) {
 165                 protection_map[0]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
 166                 protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
 167                 protection_map[2]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
 168                 protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
 169                 protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 170                 protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 171                 protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 172                 protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 173
 174                 protection_map[8]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
 175                 protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
 176                 protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
 177                 protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
 178                 protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 179                 protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
 180                 protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
 181                 protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
 182
 183         } else {
 184                 protection_map[0] = PAGE_NONE;
 185                 protection_map[1] = PAGE_READONLY;
 186                 protection_map[2] = PAGE_COPY;
 187                 protection_map[3] = PAGE_COPY;
 188                 protection_map[4] = PAGE_READONLY;
 189                 protection_map[5] = PAGE_READONLY;
 190                 protection_map[6] = PAGE_COPY;
 191                 protection_map[7] = PAGE_COPY;
 192                 protection_map[8] = PAGE_NONE;
 193                 protection_map[9] = PAGE_READONLY;
 194                 protection_map[10] = PAGE_SHARED;
 195                 protection_map[11] = PAGE_SHARED;
 196                 protection_map[12] = PAGE_READONLY;
 197                 protection_map[13] = PAGE_READONLY;
 198                 protection_map[14] = PAGE_SHARED;
 199                 protection_map[15] = PAGE_SHARED;
 200         }
 201 }
 202
 203 void cpu_cache_init(void)
 204 {
 205         if (cpu_has_3k_cache) {
 206                 extern void __weak r3k_cache_init(void);
 207
 208                 r3k_cache_init();
 209         }
 210         if (cpu_has_6k_cache) {
 211                 extern void __weak r6k_cache_init(void);
 212
 213                 r6k_cache_init();
 214         }
 215         if (cpu_has_4k_cache) {
 216                 extern void __weak r4k_cache_init(void);
 217
 218                 r4k_cache_init();
 219         }
 220         if (cpu_has_8k_cache) {
 221                 extern void __weak r8k_cache_init(void);
 222
 223                 r8k_cache_init();
 224         }
 225         if (cpu_has_tx39_cache) {
 226                 extern void __weak tx39_cache_init(void);
 227
 228                 tx39_cache_init();
 229         }
 230
 231         if (cpu_has_octeon_cache) {
 232                 extern void __weak octeon_cache_init(void);
 233
 234                 octeon_cache_init();
 235         }
 236
 237         setup_protection_map();
 238 }
 239
 240 int __weak __uncached_access(struct file *file, unsigned long addr)
 241 {
 242         if (file->f_flags & O_DSYNC)
 243                 return 1;
 244
 245         return addr >= __pa(high_memory);
 246 }