[PATCH 4/6] target/arm: Implement ID_DFR1

[Peter Maydell]

In Armv8.6, a new AArch32 ID register ID_DFR1 is defined; implement
it. We don't have any CPUs with features that they need to advertise
here yet, but plumbing in the ID register gives it the right name
when debugging and will help in future when we do add a CPU that
has non-zero ID_DFR1 fields.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/cpu.h    | 1 +
 target/arm/helper.c | 4 ++--
 target/arm/kvm64.c  | 2 ++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index fcc5927587e..fa24ce9f96b 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -983,6 +983,7 @@ struct ArchCPU {
         uint32_t mvfr1;
         uint32_t mvfr2;
         uint32_t id_dfr0;
+        uint32_t id_dfr1;
         uint32_t dbgdidr;
         uint32_t dbgdevid;
         uint32_t dbgdevid1;
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 07378519259..7ff03f1a4ba 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -7581,11 +7581,11 @@ void register_cp_regs_for_features(ARMCPU *cpu)
               .access = PL1_R, .type = ARM_CP_CONST,
               .accessfn = access_aa64_tid3,
               .resetvalue = cpu->isar.id_pfr2 },
-            { .name = "RES_0_C0_C3_5", .state = ARM_CP_STATE_BOTH,
+            { .name = "ID_DFR1", .state = ARM_CP_STATE_BOTH,
               .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 3, .opc2 = 5,
               .access = PL1_R, .type = ARM_CP_CONST,
               .accessfn = access_aa64_tid3,
-              .resetvalue = 0 },
+              .resetvalue = cpu->isar.id_dfr1 },
             { .name = "ID_MMFR5", .state = ARM_CP_STATE_BOTH,
               .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 3, .opc2 = 6,
               .access = PL1_R, .type = ARM_CP_CONST,
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index 2d737c443eb..1197253d12f 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -643,6 +643,8 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
                               ARM64_SYS_REG(3, 0, 0, 3, 2));
         err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_pfr2,
                               ARM64_SYS_REG(3, 0, 0, 3, 4));
+        err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_dfr1,
+                              ARM64_SYS_REG(3, 0, 0, 3, 5));
         err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr5,
                               ARM64_SYS_REG(3, 0, 0, 3, 6));
 
-- 
2.25.1