diff options
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 6db48d90ad63..7e2ec64aa414 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -537,6 +537,27 @@ static inline void arm64_set_ssbd_mitigation(bool state) {} #endif extern int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt); + +static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange) +{ + switch (parange) { + case 0: return 32; + case 1: return 36; + case 2: return 40; + case 3: return 42; + case 4: return 44; + case 5: return 48; + case 6: return 52; + /* + * A future PE could use a value unknown to the kernel. + * However, by the "D10.1.4 Principles of the ID scheme + * for fields in ID registers", ARM DDI 0487C.a, any new + * value is guaranteed to be higher than what we know already. + * As a safe limit, we return the limit supported by the kernel. + */ + default: return CONFIG_ARM64_PA_BITS; + } +} #endif /* __ASSEMBLY__ */ #endif |