If we want to emulate ID registers, we need to initialize ID registers firstly. This commit is to add a helper function to traverse arm64_ftr_regs so that we can initialize ID registers from arm64_ftr_regs.
Signed-off-by: zhanghailiang <[email protected]> Signed-off-by: Peng Liang <[email protected]> --- arch/arm64/include/asm/cpufeature.h | 2 ++ arch/arm64/kernel/cpufeature.c | 13 +++++++++++++ 2 files changed, 15 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 89b4f0142c28..2ba7c4f11d8a 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -79,6 +79,8 @@ struct arm64_ftr_reg { extern struct arm64_ftr_reg arm64_ftr_reg_ctrel0; +int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp); + /* * CPU capabilities: * diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index a389b999482e..eb4c78b85a35 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1112,6 +1112,19 @@ u64 read_sanitised_ftr_reg(u32 id) return regp->sys_val; } +int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp) +{ + int i, ret; + + for (i = 0; i < ARRAY_SIZE(arm64_ftr_regs); i++) { + ret = (*op)(arm64_ftr_regs[i].sys_id, + arm64_ftr_regs[i].reg->sys_val, argp); + if (ret < 0) + return ret; + } + return 0; +} + #define read_sysreg_case(r) \ case r: return read_sysreg_s(r) -- 2.18.4 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
