In ARMv8 the 32 bit coprocessor ID register space is tidied up to
remove the wildcarded aliases of the MIDR and the RAZ behaviour
for the unassigned space where crm = 3..7. Make sure we don't
expose thes wildcards for v8 cores. This means we need to have
a specific implementation for REVIDR, an IMPDEF register which
may be the same as the MIDR (and which we always implement as such).
Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
---
target-arm/helper.c | 60 +++++++++++++++++++++++++++++++++++++----------------
1 file changed, 42 insertions(+), 18 deletions(-)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 398c8f5..20952c3 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2258,8 +2258,9 @@ void register_cp_regs_for_features(ARMCPU *cpu)
* be read-only (ie write causes UNDEF exception).
*/
{
- ARMCPRegInfo id_cp_reginfo[] = {
- /* Note that the MIDR isn't a simple constant register because
+ ARMCPRegInfo id_old_midr_cp_reginfo[] = {
+ /* Pre-v8 MIDR space.
+ * Note that the MIDR isn't a simple constant register because
* of the TI925 behaviour where writes to another register can
* cause the MIDR value to change.
*
@@ -2273,22 +2274,6 @@ 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 },
- { .name = "CTR_EL0", .state = ARM_CP_STATE_AA64,
- .opc0 = 3, .opc1 = 3, .opc2 = 1, .crn = 0, .crm = 0,
- .access = PL0_R, .accessfn = ctr_el0_access,
- .type = ARM_CP_CONST, .resetvalue = cpu->ctr },
- { .name = "TCMTR",
- .cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 2,
- .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
- { .name = "TLBTR",
- .cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 3,
- .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
/* crn = 0 op1 = 0 crm = 3..7 : currently unassigned; we RAZ. */
{ .name = "DUMMY",
.cp = 15, .crn = 0, .crm = 3, .opc1 = 0, .opc2 = CP_ANY,
@@ -2307,6 +2292,37 @@ void register_cp_regs_for_features(ARMCPU *cpu)
.access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
REGINFO_SENTINEL
};
+ ARMCPRegInfo id_v8_midr_cp_reginfo[] = {
+ /* v8 MIDR -- the wildcard isn't necessary, and nor is the
+ * variable-MIDR TI925 behaviour. Instead we have a single
+ * (strictly speaking IMPDEF) alias of the MIDR, REVIDR.
+ */
+ { .name = "MIDR_EL1", .state = ARM_CP_STATE_BOTH,
+ .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 0, .opc2 = 0,
+ .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->midr },
+ { .name = "REVIDR_EL1", .state = ARM_CP_STATE_BOTH,
+ .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 0, .opc2 = 6,
+ .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->midr },
+ REGINFO_SENTINEL
+ };
+ ARMCPRegInfo id_cp_reginfo[] = {
+ /* These are common to v8 and pre-v8 */
+ { .name = "CTR",
+ .cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 1,
+ .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->ctr },
+ { .name = "CTR_EL0", .state = ARM_CP_STATE_AA64,
+ .opc0 = 3, .opc1 = 3, .opc2 = 1, .crn = 0, .crm = 0,
+ .access = PL0_R, .accessfn = ctr_el0_access,
+ .type = ARM_CP_CONST, .resetvalue = cpu->ctr },
+ /* TCMTR and TLBTR exist in v8 but have no 64-bit versions */
+ { .name = "TCMTR",
+ .cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 2,
+ .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
+ { .name = "TLBTR",
+ .cp = 15, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 3,
+ .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
+ REGINFO_SENTINEL
+ };
ARMCPRegInfo crn0_wi_reginfo = {
.name = "CRN0_WI", .cp = 15, .crn = 0, .crm = CP_ANY,
.opc1 = CP_ANY, .opc2 = CP_ANY, .access = PL1_W,
@@ -2321,10 +2337,18 @@ void register_cp_regs_for_features(ARMCPU *cpu)
* UNDEF.
*/
define_one_arm_cp_reg(cpu, &crn0_wi_reginfo);
+ for (r = id_old_midr_cp_reginfo; r->type != ARM_CP_SENTINEL; r++) {
+ r->access = PL1_RW;
+ }
for (r = id_cp_reginfo; r->type != ARM_CP_SENTINEL; r++) {
r->access = PL1_RW;
}
}
+ if (arm_feature(env, ARM_FEATURE_V8)) {
+ define_arm_cp_regs(cpu, id_v8_midr_cp_reginfo);
+ } else {
+ define_arm_cp_regs(cpu, id_old_midr_cp_reginfo);
+ }
define_arm_cp_regs(cpu, id_cp_reginfo);
}
--
1.9.1
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