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@xxxxxxxxxx>
Signed-off-by: Peng Liang <liangpeng10@xxxxxxxxxx>
---
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 f7e7144af174..8ea2c4307708 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 dcc165b3fc04..6e31d3fbd791 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2855,3 +2855,16 @@ ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr,
return sprintf(buf, "Vulnerable\n");
}
+
+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;
+}
--
2.26.2
