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