diff options
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/macro.h | 18 | ||||
| -rw-r--r-- | arch/arm/include/asm/system.h | 6 |
2 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/include/asm/macro.h b/arch/arm/include/asm/macro.h index bb33b4bc892..485310d6608 100644 --- a/arch/arm/include/asm/macro.h +++ b/arch/arm/include/asm/macro.h @@ -78,6 +78,24 @@ lr .req x30 .endm /* + * Branch if we are not in the highest exception level + */ +.macro branch_if_not_highest_el, xreg, label + switch_el \xreg, 3f, 2f, 1f + +2: mrs \xreg, ID_AA64PFR0_EL1 + and \xreg, \xreg, #(ID_AA64PFR0_EL1_EL3) + cbnz \xreg, \label + b 3f + +1: mrs \xreg, ID_AA64PFR0_EL1 + and \xreg, \xreg, #(ID_AA64PFR0_EL1_EL3 | ID_AA64PFR0_EL1_EL2) + cbnz \xreg, \label + +3: +.endm + +/* * Branch if current processor is a Cortex-A57 core. */ .macro branch_if_a57_core, xreg, a57_label diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 11fceec4d2f..8b3a54e64c8 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -80,6 +80,12 @@ #define HCR_EL2_HCD_DIS (1 << 29) /* Hypervisor Call disabled */ /* + * ID_AA64PFR0_EL1 bits definitions + */ +#define ID_AA64PFR0_EL1_EL3 (0xF << 12) /* EL3 implemented */ +#define ID_AA64PFR0_EL1_EL2 (0xF << 8) /* EL2 implemented */ + +/* * CPACR_EL1 bits definitions */ #define CPACR_EL1_FPEN_EN (3 << 20) /* SIMD and FP instruction enabled */ |