diff options
Diffstat (limited to 'payloads')
| -rw-r--r-- | payloads/libpayload/include/arm64/arch/lib_helpers.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/payloads/libpayload/include/arm64/arch/lib_helpers.h b/payloads/libpayload/include/arm64/arch/lib_helpers.h index 3adba81c88..d98d6f7d6b 100644 --- a/payloads/libpayload/include/arm64/arch/lib_helpers.h +++ b/payloads/libpayload/include/arm64/arch/lib_helpers.h @@ -33,6 +33,61 @@ #ifndef __ARCH_LIB_HELPERS_H__ #define __ARCH_LIB_HELPERS_H__ +#ifdef __ASSEMBLY__ + +/* Macro to switch to label based on current el */ +.macro switch_el xreg label1 label2 label3 + mrs \xreg, CurrentEL + /* Currently at EL1 */ + cmp \xreg, 0x4 + b.eq \label1 + /* Currently at EL2 */ + cmp \xreg, 0x8 + b.eq \label2 + /* Currently at EL3 */ + cmp \xreg, 0xc + b.eq \label3 +.endm + +/* Macro to read sysreg at current EL + xreg - reg in which read value needs to be stored + sysreg - system reg that is to be read +*/ +.macro read_current xreg sysreg + switch_el \xreg, 101f, 102f, 103f +101: + mrs \xreg, \sysreg\()_el1 + b 104f +102: + mrs \xreg, \sysreg\()_el2 + b 104f +103: + mrs \xreg, \sysreg\()_el3 + b 104f +104: +.endm + +/* Macro to write sysreg at current EL + xreg - reg from which value needs to be written + sysreg - system reg that is to be written + temp - temp reg that can be used to read current EL +*/ +.macro write_current sysreg xreg temp + switch_el \temp, 101f, 102f, 103f +101: + msr \sysreg\()_el1, \xreg + b 104f +102: + msr \sysreg\()_el2, \xreg + b 104f +103: + msr \sysreg\()_el3, \xreg + b 104f +104: +.endm + +#else + #define EL0 0 #define EL1 1 #define EL2 2 @@ -318,4 +373,6 @@ void tlbivaa_el1(uint64_t va); /* Clock */ void set_cntfrq(uint32_t freq); +#endif // __ASSEMBLY__ + #endif //__ARCH_LIB_HELPERS_H__ |