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 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 b4779d91eff5..f776f8239699 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 a9a039364aa1..3c45f3fa7f98 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -762,6 +762,19 @@ 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)