diff options
Diffstat (limited to 'arch/arm/mm/mmu.c')
| -rw-r--r-- | arch/arm/mm/mmu.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index d028dc74a9d5..b590a4c92462 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -52,6 +52,8 @@ EXPORT_SYMBOL(empty_zero_page); */ pmd_t *top_pmd; +pmdval_t user_pmd_table = _PAGE_USER_TABLE; + #define CPOLICY_UNCACHED 0 #define CPOLICY_BUFFERED 1 #define CPOLICY_WRITETHROUGH 2 @@ -528,14 +530,23 @@ static void __init build_mem_type_table(void) hyp_device_pgprot = mem_types[MT_DEVICE].prot_pte; s2_device_pgprot = mem_types[MT_DEVICE].prot_pte_s2; +#ifndef CONFIG_ARM_LPAE /* * We don't use domains on ARMv6 (since this causes problems with * v6/v7 kernels), so we must use a separate memory type for user * r/o, kernel r/w to map the vectors page. */ -#ifndef CONFIG_ARM_LPAE if (cpu_arch == CPU_ARCH_ARMv6) vecs_pgprot |= L_PTE_MT_VECTORS; + + /* + * Check is it with support for the PXN bit + * in the Short-descriptor translation table format descriptors. + */ + if (cpu_arch == CPU_ARCH_ARMv7 && + (read_cpuid_ext(CPUID_EXT_MMFR0) & 0xF) == 4) { + user_pmd_table |= PMD_PXNTABLE; + } #endif /* @@ -605,6 +616,11 @@ static void __init build_mem_type_table(void) } kern_pgprot |= PTE_EXT_AF; vecs_pgprot |= PTE_EXT_AF; + + /* + * Set PXN for user mappings + */ + user_pgprot |= PTE_EXT_PXN; #endif for (i = 0; i < 16; i++) { |