[Qemu-devel] [PATCH v6 32/37] target-arm: Implement RVBAR register

[Peter Maydell <peter.maydell@linaro.org>]

Implement the AArch64 RVBAR register, which indicates the reset
address. Since the reset address is implementation defined and
usually configurable by setting config signals in hardware, we
also provide a QOM property so it can be set at board level if
necessary.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
---
 target-arm/cpu-qom.h | 1 +
 target-arm/cpu.c     | 9 +++++++++
 target-arm/helper.c  | 6 ++++++
 3 files changed, 16 insertions(+)

diff --git a/target-arm/cpu-qom.h b/target-arm/cpu-qom.h
index 2b6b370..743985e 100644
--- a/target-arm/cpu-qom.h
+++ b/target-arm/cpu-qom.h
@@ -153,6 +153,7 @@ typedef struct ARMCPU {
     bool reset_hivecs;
     /* DCZ blocksize, in log_2(words), ie low 4 bits of DCZID_EL0 */
     uint32_t dcz_blocksize;
+    uint64_t rvbar;
 } ARMCPU;
 
 #define TYPE_AARCH64_CPU "aarch64-cpu"
diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index a78a36b..783fc73 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -105,6 +105,7 @@ static void arm_cpu_reset(CPUState *s)
         env->cp15.c1_coproc = deposit64(env->cp15.c1_coproc, 20, 2, 3);
 #else
         env->pstate = PSTATE_MODE_EL1h;
+        env->pc = cpu->rvbar;
 #endif
     } else {
 #if defined(CONFIG_USER_ONLY)
@@ -266,6 +267,9 @@ static Property arm_cpu_reset_cbar_property =
 static Property arm_cpu_reset_hivecs_property =
             DEFINE_PROP_BOOL("reset-hivecs", ARMCPU, reset_hivecs, false);
 
+static Property arm_cpu_rvbar_property =
+            DEFINE_PROP_UINT64("rvbar", ARMCPU, rvbar, 0);
+
 static void arm_cpu_post_init(Object *obj)
 {
     ARMCPU *cpu = ARM_CPU(obj);
@@ -279,6 +283,11 @@ static void arm_cpu_post_init(Object *obj)
         qdev_property_add_static(DEVICE(obj), &arm_cpu_reset_hivecs_property,
                                  &error_abort);
     }
+
+    if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
+        qdev_property_add_static(DEVICE(obj), &arm_cpu_rvbar_property,
+                                 &error_abort);
+    }
 }
 
 static void arm_cpu_finalizefn(Object *obj)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 34b0277..4a74249 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2295,6 +2295,12 @@ void register_cp_regs_for_features(ARMCPU *cpu)
               .resetvalue = cpu->mvfr2 },
             REGINFO_SENTINEL
         };
+        ARMCPRegInfo rvbar = {
+            .name = "RVBAR_EL1", .state = ARM_CP_STATE_AA64,
+            .opc0 = 3, .opc1 = 0, .crn = 12, .crm = 0, .opc2 = 2,
+            .type = ARM_CP_CONST, .access = PL1_R, .resetvalue = cpu->rvbar
+        };
+        define_one_arm_cp_reg(cpu, &rvbar);
         define_arm_cp_regs(cpu, v8_idregs);
         define_arm_cp_regs(cpu, v8_cp_reginfo);
         define_aarch64_debug_regs(cpu);
-- 
1.9.1