[Qemu-devel] [PULL 5/7] target/arm: Move PMSAv7 reset into arm_cpu_reset() so M profile MPUs get reset

[Peter Maydell]

When the PMSAv7 implementation was originally added it was for R profile
CPUs only, and reset was handled using the cpreg .resetfn hooks.
Unfortunately for M profile cores this doesn't work, because they do
not register any cpregs. Move the reset handling into arm_cpu_reset(),
where it will work for both R profile and M profile cores.

Signed-off-by: Peter Maydell <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Message-id: address@hidden
---
 target/arm/cpu.c    | 14 ++++++++++++++
 target/arm/helper.c | 28 ++++++++++++----------------
 2 files changed, 26 insertions(+), 16 deletions(-)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 96d1f84..05c038b 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -232,6 +232,20 @@ static void arm_cpu_reset(CPUState *s)
 
     env->vfp.xregs[ARM_VFP_FPEXC] = 0;
 #endif
+
+    if (arm_feature(env, ARM_FEATURE_PMSA) &&
+        arm_feature(env, ARM_FEATURE_V7)) {
+        if (cpu->pmsav7_dregion > 0) {
+            memset(env->pmsav7.drbar, 0,
+                   sizeof(*env->pmsav7.drbar) * cpu->pmsav7_dregion);
+            memset(env->pmsav7.drsr, 0,
+                   sizeof(*env->pmsav7.drsr) * cpu->pmsav7_dregion);
+            memset(env->pmsav7.dracr, 0,
+                   sizeof(*env->pmsav7.dracr) * cpu->pmsav7_dregion);
+        }
+        env->pmsav7.rnr = 0;
+    }
+
     set_flush_to_zero(1, &env->vfp.standard_fp_status);
     set_flush_inputs_to_zero(1, &env->vfp.standard_fp_status);
     set_default_nan_mode(1, &env->vfp.standard_fp_status);
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 0f79b25..fa60040 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -2404,18 +2404,6 @@ static void pmsav7_write(CPUARMState *env, const 
ARMCPRegInfo *ri,
     *u32p = value;
 }
 
-static void pmsav7_reset(CPUARMState *env, const ARMCPRegInfo *ri)
-{
-    ARMCPU *cpu = arm_env_get_cpu(env);
-    uint32_t *u32p = *(uint32_t **)raw_ptr(env, ri);
-
-    if (!u32p) {
-        return;
-    }
-
-    memset(u32p, 0, sizeof(*u32p) * cpu->pmsav7_dregion);
-}
-
 static void pmsav7_rgnr_write(CPUARMState *env, const ARMCPRegInfo *ri,
                               uint64_t value)
 {
@@ -2433,22 +2421,30 @@ static void pmsav7_rgnr_write(CPUARMState *env, const 
ARMCPRegInfo *ri,
 }
 
 static const ARMCPRegInfo pmsav7_cp_reginfo[] = {
+    /* Reset for all these registers is handled in arm_cpu_reset(),
+     * because the PMSAv7 is also used by M-profile CPUs, which do
+     * not register cpregs but still need the state to be reset.
+     */
     { .name = "DRBAR", .cp = 15, .crn = 6, .opc1 = 0, .crm = 1, .opc2 = 0,
       .access = PL1_RW, .type = ARM_CP_NO_RAW,
       .fieldoffset = offsetof(CPUARMState, pmsav7.drbar),
-      .readfn = pmsav7_read, .writefn = pmsav7_write, .resetfn = pmsav7_reset 
},
+      .readfn = pmsav7_read, .writefn = pmsav7_write,
+      .resetfn = arm_cp_reset_ignore },
     { .name = "DRSR", .cp = 15, .crn = 6, .opc1 = 0, .crm = 1, .opc2 = 2,
       .access = PL1_RW, .type = ARM_CP_NO_RAW,
       .fieldoffset = offsetof(CPUARMState, pmsav7.drsr),
-      .readfn = pmsav7_read, .writefn = pmsav7_write, .resetfn = pmsav7_reset 
},
+      .readfn = pmsav7_read, .writefn = pmsav7_write,
+      .resetfn = arm_cp_reset_ignore },
     { .name = "DRACR", .cp = 15, .crn = 6, .opc1 = 0, .crm = 1, .opc2 = 4,
       .access = PL1_RW, .type = ARM_CP_NO_RAW,
       .fieldoffset = offsetof(CPUARMState, pmsav7.dracr),
-      .readfn = pmsav7_read, .writefn = pmsav7_write, .resetfn = pmsav7_reset 
},
+      .readfn = pmsav7_read, .writefn = pmsav7_write,
+      .resetfn = arm_cp_reset_ignore },
     { .name = "RGNR", .cp = 15, .crn = 6, .opc1 = 0, .crm = 2, .opc2 = 0,
       .access = PL1_RW,
       .fieldoffset = offsetof(CPUARMState, pmsav7.rnr),
-      .writefn = pmsav7_rgnr_write },
+      .writefn = pmsav7_rgnr_write,
+      .resetfn = arm_cp_reset_ignore },
     REGINFO_SENTINEL
 };
 
-- 
2.7.4