[Qemu-devel] [PATCH 27/33] target-arm: Convert cp15 cache ID registers

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

Convert the cp15 cache ID registers to the new scheme.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target-arm/cpu.c    |    2 -
 target-arm/cpu.h    |    2 -
 target-arm/helper.c |   61 +++++++++++++++++++++++++++-----------------------
 3 files changed, 33 insertions(+), 32 deletions(-)

diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index f9b3046..f4c9116 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -77,8 +77,6 @@ static void arm_cpu_reset(CPUState *s)
     env->vfp.xregs[ARM_VFP_MVFR0] = cpu->mvfr0;
     env->vfp.xregs[ARM_VFP_MVFR1] = cpu->mvfr1;
     env->cp15.c0_cachetype = cpu->ctr;
-    env->cp15.c0_clid = cpu->clidr;
-    memcpy(env->cp15.c0_ccsid, cpu->ccsidr, ARRAY_SIZE(cpu->ccsidr));
 
     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
         env->iwmmxt.cregs[ARM_IWMMXT_wCID] = 0x69051000 | 'Q';
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 0953543..0b984d8 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -108,8 +108,6 @@ typedef struct CPUARMState {
     struct {
         uint32_t c0_cpuid;
         uint32_t c0_cachetype;
-        uint32_t c0_ccsid[16]; /* Cache size.  */
-        uint32_t c0_clid; /* Cache level.  */
         uint32_t c0_cssel; /* Cache size selection.  */
         uint32_t c1_sys; /* System control register.  */
         uint32_t c1_coproc; /* Coprocessor access register.  */
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 11b2ad9..269740d 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -193,6 +193,9 @@ static const ARMCPRegInfo not_v7_cp_reginfo[] = {
     { .name = "ILOCKDOWN", .cp = 15, .crn = 9, .crm = 0, .opc1 = 0, .opc2 = 1,
       .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.c9_insn),
       .resetvalue = 0 },
+    /* v6 doesn't have the cache ID registers but Linux reads them anyway */
+    { .name = "DUMMY", .cp = 15, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = CP_ANY,
+      .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
     REGINFO_SENTINEL
 };
 
@@ -322,6 +325,21 @@ static int pmintenclr_write(CPUARMState *env, const ARMCPRegInfo *ri,
     return 0;
 }
 
+static int ccsidr_read(CPUARMState *env, const ARMCPRegInfo *ri,
+                       uint64_t *value)
+{
+    ARMCPU *cpu = arm_env_get_cpu(env);
+    *value = cpu->ccsidr[env->cp15.c0_cssel];
+    return 0;
+}
+
+static int csselr_write(CPUARMState *env, const ARMCPRegInfo *ri,
+                        uint64_t value)
+{
+    env->cp15.c0_cssel = value & 0xf;
+    return 0;
+}
+
 static const ARMCPRegInfo v7_cp_reginfo[] = {
     /* DBGDRAR, DBGDSAR: always RAZ since we don't implement memory mapped
      * debug components
@@ -392,6 +410,16 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
     { .name = "SCR", .cp = 15, .crn = 1, .crm = 1, .opc1 = 0, .opc2 = 0,
       .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.c1_scr),
       .resetvalue = 0, },
+    { .name = "CCSIDR", .cp = 15, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = 0,
+      .access = PL1_R, .readfn = ccsidr_read },
+    { .name = "CSSELR", .cp = 15, .crn = 0, .crm = 0, .opc1 = 2, .opc2 = 0,
+      .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.c0_cssel),
+      .writefn = csselr_write, .resetvalue = 0 },
+    /* Auxiliary ID register: this actually has an IMPDEF value but for now
+     * just RAZ for all cores:
+     */
+    { .name = "AIDR", .cp = 15, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = 7,
+      .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
     REGINFO_SENTINEL
 };
 
@@ -896,7 +924,12 @@ void register_cp_regs_for_features(ARMCPU *cpu)
             .fieldoffset = offsetof(CPUARMState, cp15.c9_pmcr),
             .readfn = pmreg_read, .writefn = pmcr_write
         };
+        ARMCPRegInfo clidr = {
+            .name = "CLIDR", .cp = 15, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = 1,
+            .access = PL1_R, .type = ARM_CP_CONST, .resetvalue = cpu->clidr
+        };
         define_one_arm_cp_reg(cpu, &pmcr);
+        define_one_arm_cp_reg(cpu, &clidr);
         define_arm_cp_regs(cpu, v7_cp_reginfo);
     } else {
         define_arm_cp_regs(cpu, not_v7_cp_reginfo);
@@ -2051,11 +2084,6 @@ void HELPER(set_cp15)(CPUARMState *env, uint32_t insn, uint32_t val)
             break;
         if (arm_feature(env, ARM_FEATURE_OMAPCP))
             break;
-        if (arm_feature(env, ARM_FEATURE_V7)
-                && op1 == 2 && crm == 0 && op2 == 0) {
-            env->cp15.c0_cssel = val & 0xf;
-            break;
-        }
         goto bad_reg;
     case 4: /* Reserved.  */
         goto bad_reg;
@@ -2123,29 +2151,6 @@ uint32_t HELPER(get_cp15)(CPUARMState *env, uint32_t insn)
             default:
                 goto bad_reg;
             }
-        case 1:
-            /* These registers aren't documented on arm11 cores.  However
-               Linux looks at them anyway.  */
-            if (!arm_feature(env, ARM_FEATURE_V6))
-                goto bad_reg;
-            if (crm != 0)
-                goto bad_reg;
-            if (!arm_feature(env, ARM_FEATURE_V7))
-                return 0;
-
-            switch (op2) {
-            case 0:
-                return env->cp15.c0_ccsid[env->cp15.c0_cssel];
-            case 1:
-                return env->cp15.c0_clid;
-            case 7:
-                return 0;
-            }
-            goto bad_reg;
-        case 2:
-            if (op2 != 0 || crm != 0)
-                goto bad_reg;
-            return env->cp15.c0_cssel;
         default:
             goto bad_reg;
         }
-- 
1.7.1