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