diff options
Diffstat (limited to 'src/arch/arm64/armv8/mmu.c')
| -rw-r--r-- | src/arch/arm64/armv8/mmu.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/arch/arm64/armv8/mmu.c b/src/arch/arm64/armv8/mmu.c index a24e7c6fdd..48f77ace83 100644 --- a/src/arch/arm64/armv8/mmu.c +++ b/src/arch/arm64/armv8/mmu.c @@ -274,6 +274,40 @@ void mmu_init(void) TCR_TBI_USED); } +/* Func : mmu_save_context + * Desc : Save mmu context (registers and ttbr base). + */ +void mmu_save_context(struct mmu_context *mmu_context) +{ + assert(mmu_context); + + /* Back-up MAIR_ATTRIBUTES */ + mmu_context->mair = raw_read_mair_el3(); + + /* Back-up TCR value */ + mmu_context->tcr = raw_read_tcr_el3(); +} + +/* Func : mmu_restore_context + * Desc : Restore mmu context using input backed-up context + */ +void mmu_restore_context(const struct mmu_context *mmu_context) +{ + assert(mmu_context); + + /* Restore TTBR */ + raw_write_ttbr0_el3((uintptr_t)_ttb); + + /* Restore MAIR indices */ + raw_write_mair_el3(mmu_context->mair); + + /* Restore TCR flags */ + raw_write_tcr_el3(mmu_context->tcr); + + /* invalidate tlb since ttbr is updated. */ + tlb_invalidate_all(); +} + void mmu_enable(void) { if (((get_pte(_ttb) >> BLOCK_INDEX_SHIFT) & BLOCK_INDEX_MASK) |