diff options
-rw-r--r-- | arch/arm64/mm/mmu.c | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 328638548871..e57c170a91f3 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -45,80 +45,6 @@ struct page *empty_zero_page; EXPORT_SYMBOL(empty_zero_page); -struct cachepolicy { - const char policy[16]; - u64 mair; - u64 tcr; -}; - -static struct cachepolicy cache_policies[] __initdata = { - { - .policy = "uncached", - .mair = 0x44, /* inner, outer non-cacheable */ - .tcr = TCR_IRGN_NC | TCR_ORGN_NC, - }, { - .policy = "writethrough", - .mair = 0xaa, /* inner, outer write-through, read-allocate */ - .tcr = TCR_IRGN_WT | TCR_ORGN_WT, - }, { - .policy = "writeback", - .mair = 0xee, /* inner, outer write-back, read-allocate */ - .tcr = TCR_IRGN_WBnWA | TCR_ORGN_WBnWA, - } -}; - -/* - * These are useful for identifying cache coherency problems by allowing the - * cache or the cache and writebuffer to be turned off. It changes the Normal - * memory caching attributes in the MAIR_EL1 register. - */ -static int __init early_cachepolicy(char *p) -{ - int i; - u64 tmp; - - for (i = 0; i < ARRAY_SIZE(cache_policies); i++) { - int len = strlen(cache_policies[i].policy); - - if (memcmp(p, cache_policies[i].policy, len) == 0) - break; - } - if (i == ARRAY_SIZE(cache_policies)) { - pr_err("ERROR: unknown or unsupported cache policy: %s\n", p); - return 0; - } - - flush_cache_all(); - - /* - * Modify MT_NORMAL attributes in MAIR_EL1. - */ - asm volatile( - " mrs %0, mair_el1\n" - " bfi %0, %1, %2, #8\n" - " msr mair_el1, %0\n" - " isb\n" - : "=&r" (tmp) - : "r" (cache_policies[i].mair), "i" (MT_NORMAL * 8)); - - /* - * Modify TCR PTW cacheability attributes. - */ - asm volatile( - " mrs %0, tcr_el1\n" - " bic %0, %0, %2\n" - " orr %0, %0, %1\n" - " msr tcr_el1, %0\n" - " isb\n" - : "=&r" (tmp) - : "r" (cache_policies[i].tcr), "r" (TCR_IRGN_MASK | TCR_ORGN_MASK)); - - flush_cache_all(); - - return 0; -} -early_param("cachepolicy", early_cachepolicy); - pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot) { |