diff options
Diffstat (limited to 'lib/aarch64/misc_helpers.S')
| -rw-r--r-- | lib/aarch64/misc_helpers.S | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/lib/aarch64/misc_helpers.S b/lib/aarch64/misc_helpers.S index f605bf4..672d269 100644 --- a/lib/aarch64/misc_helpers.S +++ b/lib/aarch64/misc_helpers.S @@ -45,6 +45,7 @@ #if SUPPORT_VFP .globl enable_vfp + .globl disable_fp_traps #endif func get_afflvl_shift @@ -67,7 +68,6 @@ func mpidr_mask_lower_afflvls func eret eret - func smc smc #0 @@ -169,4 +169,22 @@ func enable_vfp msr cptr_el3, x0 isb ret + +func disable_fp_traps + JUMP_EL1_OR_EL2 x0, _disable_fp_traps_el1, _disable_fp_traps_el2 +_disable_fp_traps_el1: + /* Read EL1 Coprocessor Access Control Register (CPACR) */ + mrs x0, cpacr_el1 + /* Disable trapping of instructions accessing FP regs */ + orr x0, x0, #CPACR_EL1_FPEN(3) + /* Write back EL1 Coprocessor Access Control Register (CPACR) */ + msr cpacr_el1, x0 + ret +_disable_fp_traps_el2: + mrs x0, cptr_el2 + mov x1, #TFP_BIT + bic x0, x0, x1 + msr cptr_el2, x0 + ret + #endif |