diff options
| -rw-r--r-- | arch/arm/cpu/mmu-early.c | 7 | ||||
| -rw-r--r-- | arch/arm/cpu/mmu.c | 7 | ||||
| -rw-r--r-- | arch/arm/cpu/mmu.h | 1 |
3 files changed, 13 insertions, 2 deletions
diff --git a/arch/arm/cpu/mmu-early.c b/arch/arm/cpu/mmu-early.c index 2f5876fc46..7c30526b94 100644 --- a/arch/arm/cpu/mmu-early.c +++ b/arch/arm/cpu/mmu-early.c @@ -29,7 +29,12 @@ void mmu_early_enable(unsigned long membase, unsigned long memsize, arm_set_cache_functions(); set_ttbr(ttb); - set_domain(DOMAIN_MANAGER); + + /* For the XN bit to take effect, we can't be using DOMAIN_MANAGER. */ + if (cpu_architecture() >= CPU_ARCH_ARMv7) + set_domain(DOMAIN_CLIENT); + else + set_domain(DOMAIN_MANAGER); /* * This marks the whole address space as uncachable as well as diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c index efe4620d84..158b130b57 100644 --- a/arch/arm/cpu/mmu.c +++ b/arch/arm/cpu/mmu.c @@ -446,7 +446,12 @@ void __mmu_init(bool mmu_on) ttb = xmemalign(ARM_TTB_SIZE, ARM_TTB_SIZE); set_ttbr(ttb); - set_domain(DOMAIN_MANAGER); + + /* For the XN bit to take effect, we can't be using DOMAIN_MANAGER. */ + if (cpu_architecture() >= CPU_ARCH_ARMv7) + set_domain(DOMAIN_CLIENT); + else + set_domain(DOMAIN_MANAGER); create_flat_mapping(ttb); __mmu_cache_flush(); diff --git a/arch/arm/cpu/mmu.h b/arch/arm/cpu/mmu.h index c911ee209f..6e7a4c0350 100644 --- a/arch/arm/cpu/mmu.h +++ b/arch/arm/cpu/mmu.h @@ -36,6 +36,7 @@ static inline void set_ttbr(void *ttb) asm volatile ("mcr p15,0,%0,c2,c0,0" : : "r"(ttb) /*:*/); } +#define DOMAIN_CLIENT 1 #define DOMAIN_MANAGER 3 static inline void set_domain(unsigned val) |