1 files changed, 21 insertions, 0 deletions
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index c92c097b44..7c31e5a2d1 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -2464,6 +2464,27 @@ static inline void define_one_arm_cp_reg(ARMCPU *cpu, const ARMCPRegInfo *regs)
 }
 const ARMCPRegInfo *get_arm_cp_reginfo(GHashTable *cpregs, uint32_t encoded_cp);
 
+/*
+ * Definition of an ARM co-processor register as viewed from
+ * userspace. This is used for presenting sanitised versions of
+ * registers to userspace when emulating the Linux AArch64 CPU
+ * ID/feature ABI (advertised as HWCAP_CPUID).
+ */
+typedef struct ARMCPRegUserSpaceInfo {
+    /* Name of register */
+    const char *name;
+
+    /* Only some bits are exported to user space */
+    uint64_t exported_bits;
+
+    /* Fixed bits are applied after the mask */
+    uint64_t fixed_bits;
+} ARMCPRegUserSpaceInfo;
+
+#define REGUSERINFO_SENTINEL { .name = NULL }
+
+void modify_arm_cp_regs(ARMCPRegInfo *regs, const ARMCPRegUserSpaceInfo *mods);
+
 /* CPWriteFn that can be used to implement writes-ignored behaviour */
 void arm_cp_write_ignore(CPUARMState *env, const ARMCPRegInfo *ri,
                          uint64_t value);