target-arm: Implement AArch64 MIDR_EL1

Implement the AArch64 view of the MIDR system register
(for AArch64 it is a simple constant, unlike the complicated
mess that TI925 imposes on the 32-bit view).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

diff --git a/target-arm/helper.c b/target-arm/helper.c
index ff1ed7d5517ca45182d9989abe56e6fe67d3985d..e5575338ffed118e59b894b7436a448dd85a237a 100644 (file)
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1720,6 +1720,9 @@ void register_cp_regs_for_features(ARMCPU *cpu)
               .writefn = arm_cp_write_ignore, .raw_writefn = raw_write,
               .fieldoffset = offsetof(CPUARMState, cp15.c0_cpuid),
               .type = ARM_CP_OVERRIDE },
+            { .name = "MIDR_EL1", .state = ARM_CP_STATE_AA64,
+              .opc0 = 3, .opc1 = 0, .opc2 = 0, .crn = 0, .crm = 0,
+              .access = PL1_R, .resetvalue = cpu->midr, .type = ARM_CP_CONST },
             { .name = "CTR",
               .cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 1,
               .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->ctr },