[Qemu-devel] [PATCH v6 21/32] target-arm: make CSSELR banked

[Greg Bellows <greg.bellows@linaro.org>]

From: Fabian Aggeler <aggelerf@ethz.ch>

Rename CSSELR (cache size selection register) and add secure
instance (AArch32).

Signed-off-by: Fabian Aggeler <aggelerf@ethz.ch>
Signed-off-by: Greg Bellows <greg.bellows@linaro.org>

==========

v5 -> v6
- Changed _el field variants to be array based
- Switch to use distinct CPREG secure flags.
- Merged CSSELR and CSSELR_EL1 reginfo entries

v4 -> v5
- Changed to use the CCSIDR cpreg bank flag to select the csselr bank instead
  of the  A32_BANKED macro.  This more accurately uses the secure state bank
  matching the CCSIDR.
---
 target-arm/cpu.h    | 10 +++++++++-
 target-arm/helper.c | 16 ++++++++++++----
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 5cf58f4..a8c299c 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -177,7 +177,15 @@ typedef struct CPUARMState {
     /* System control coprocessor (cp15) */
     struct {
         uint32_t c0_cpuid;
-        uint64_t c0_cssel; /* Cache size selection.  */
+        union { /* Cache size selection */
+            struct {
+                uint64_t _unused_csselr0;
+                uint64_t csselr_ns;
+                uint64_t _unused_csselr1;
+                uint64_t csselr_s;
+            };
+            uint64_t csselr_el[4];
+        };
         union { /* System control register. */
             struct {
                 uint64_t _unused_sctlr;
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 25d4240..55d961e 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -789,7 +789,14 @@ static void scr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
 static uint64_t ccsidr_read(CPUARMState *env, const ARMCPRegInfo *ri)
 {
     ARMCPU *cpu = arm_env_get_cpu(env);
-    return cpu->ccsidr[env->cp15.c0_cssel];
+
+    /* Acquire the CSSELR index from the bank corresponding to the CCSIDR
+     * bank
+     */
+    uint32_t index = A32_BANKED_REG_GET(env, csselr,
+                                 ARM_CP_SECSTATE_TEST(ri, ARM_CP_SECSTATE_S));
+
+    return cpu->ccsidr[index];
 }
 
 static void csselr_write(CPUARMState *env, const ARMCPRegInfo *ri,
@@ -915,9 +922,10 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
       .opc0 = 3, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = 0,
       .access = PL1_R, .readfn = ccsidr_read, .type = ARM_CP_NO_MIGRATE },
     { .name = "CSSELR", .state = ARM_CP_STATE_BOTH,
-      .opc0 = 3, .crn = 0, .crm = 0, .opc1 = 2, .opc2 = 0,
-      .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.c0_cssel),
-      .writefn = csselr_write, .resetvalue = 0 },
+      .cp = 15, .crn = 0, .crm = 0, .opc1 = 2, .opc2 = 0,
+      .access = PL1_RW, .writefn = csselr_write, .resetvalue = 0,
+      .bank_fieldoffsets = { offsetof(CPUARMState, cp15.csselr_s),
+                             offsetof(CPUARMState, cp15.csselr_ns) } },
     /* Auxiliary ID register: this actually has an IMPDEF value but for now
      * just RAZ for all cores:
      */
-- 
1.8.3.2