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