diff options
Diffstat (limited to 'bl1/aarch32/bl1_entrypoint.S')
| -rw-r--r-- | bl1/aarch32/bl1_entrypoint.S | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/bl1/aarch32/bl1_entrypoint.S b/bl1/aarch32/bl1_entrypoint.S index e3d915fb..39ebcf73 100644 --- a/bl1/aarch32/bl1_entrypoint.S +++ b/bl1/aarch32/bl1_entrypoint.S @@ -71,9 +71,21 @@ func bl1_entrypoint */ /* - * MMU needs to be disabled because both BL1 and BL2 execute + * Get the smc_context for next BL image, + * program the gp/system registers and save it in `r4`. + */ + bl smc_get_next_ctx + mov r4, r0 + + /* Only turn-off MMU if going to secure world */ + ldr r5, [r4, #SMC_CTX_SCR] + tst r5, #SCR_NS_BIT + bne skip_mmu_off + + /* + * MMU needs to be disabled because both BL1 and BL2/BL2U execute * in PL1, and therefore share the same address space. - * BL2 will initialize the address space according to its + * BL2/BL2U will initialize the address space according to its * own requirement. */ bl disable_mmu_icache_secure @@ -81,11 +93,8 @@ func bl1_entrypoint dsb sy isb - /* - * Get the smc_context for next BL image, - * program the gp/system registers and exit - * secure monitor mode - */ - bl smc_get_next_ctx +skip_mmu_off: + /* Restore smc_context from `r4` and exit secure monitor mode. */ + mov r0, r4 monitor_exit endfunc bl1_entrypoint |