From: Peng Liang <liangpeng10@huawei.com> hulk inclusion category: feature bugzilla: NA CVE: NA 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 <zhang.zhanghailiang@huawei.com> Signed-off-by: Peng Liang <liangpeng10@huawei.com> Acked-by: Hanjun Guo <guohanjun@huawei.com> Reviewed-by: Xiangyou Xie <xiexiangyou@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- 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 b4779d91eff59..f776f82396990 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -89,6 +89,8 @@ 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 beea9be91cd1a..9bc92d8deb773 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -763,6 +763,19 @@ 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) -- 2.25.1