Patchwork [03/30] PPC: Remove env->hreset_excp_prefix

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Submitter Alexander Graf
Date April 26, 2013, 6:21 p.m.
Message ID <1367000509-8833-4-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/240024/
State New
Headers show

Comments

Alexander Graf - April 26, 2013, 6:21 p.m.
From: Fabien Chouteau <chouteau@adacore.com>

This value is not needed if we use correctly the MSR[IP] bit.

excp_prefix is always 0x00000000, except when the MSR[IP] bit is
implemented and set to 1, in that case excp_prefix is 0xfff00000.

The handling of MSR[IP] was already implemented but not used at reset
because the value of env->msr was changed "manually".

The patch uses the function hreg_store_msr() to set env->msr, this
ensures a good handling of MSR[IP] at reset, and therefore a good value
for excp_prefix.

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 hw/ppc/spapr.c              |    6 ++++--
 target-ppc/cpu.h            |    1 -
 target-ppc/machine.c        |    2 --
 target-ppc/translate_init.c |   42 ++++++++++++------------------------------
 4 files changed, 16 insertions(+), 35 deletions(-)

Patch

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 7a42501..e35c26f 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -801,8 +801,10 @@  static void ppc_spapr_init(QEMUMachineInitArgs *args)
         /* Set time-base frequency to 512 MHz */
         cpu_ppc_tb_init(env, TIMEBASE_FREQ);
 
-        /* PAPR always has exception vectors in RAM not ROM */
-        env->hreset_excp_prefix = 0;
+        /* PAPR always has exception vectors in RAM not ROM. To ensure this,
+         * MSR[IP] should never be set.
+         */
+        env->msr_mask &= ~(1 << 6);
 
         /* Tell KVM that we're in PAPR mode */
         if (kvm_enabled()) {
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 42c36e2..99ebf7e 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -1026,7 +1026,6 @@  struct CPUPPCState {
     /* Exception vectors */
     target_ulong excp_vectors[POWERPC_EXCP_NB];
     target_ulong excp_prefix;
-    target_ulong hreset_excp_prefix;
     target_ulong ivor_mask;
     target_ulong ivpr_mask;
     target_ulong hreset_vector;
diff --git a/target-ppc/machine.c b/target-ppc/machine.c
index 235b0d5..2d10adb 100644
--- a/target-ppc/machine.c
+++ b/target-ppc/machine.c
@@ -78,7 +78,6 @@  void cpu_save(QEMUFile *f, void *opaque)
     for (i = 0; i < POWERPC_EXCP_NB; i++)
         qemu_put_betls(f, &env->excp_vectors[i]);
     qemu_put_betls(f, &env->excp_prefix);
-    qemu_put_betls(f, &env->hreset_excp_prefix);
     qemu_put_betls(f, &env->ivor_mask);
     qemu_put_betls(f, &env->ivpr_mask);
     qemu_put_betls(f, &env->hreset_vector);
@@ -167,7 +166,6 @@  int cpu_load(QEMUFile *f, void *opaque, int version_id)
     for (i = 0; i < POWERPC_EXCP_NB; i++)
         qemu_get_betls(f, &env->excp_vectors[i]);
     qemu_get_betls(f, &env->excp_prefix);
-    qemu_get_betls(f, &env->hreset_excp_prefix);
     qemu_get_betls(f, &env->ivor_mask);
     qemu_get_betls(f, &env->ivpr_mask);
     qemu_get_betls(f, &env->hreset_vector);
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index aea7d27..402ad2a 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -2593,7 +2593,6 @@  static void init_excp_4xx_real (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_FIT]      = 0x00001010;
     env->excp_vectors[POWERPC_EXCP_WDT]      = 0x00001020;
     env->excp_vectors[POWERPC_EXCP_DEBUG]    = 0x00002000;
-    env->hreset_excp_prefix = 0x00000000UL;
     env->ivor_mask = 0x0000FFF0UL;
     env->ivpr_mask = 0xFFFF0000UL;
     /* Hardware reset vector */
@@ -2618,7 +2617,6 @@  static void init_excp_4xx_softmmu (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_DTLB]     = 0x00001100;
     env->excp_vectors[POWERPC_EXCP_ITLB]     = 0x00001200;
     env->excp_vectors[POWERPC_EXCP_DEBUG]    = 0x00002000;
-    env->hreset_excp_prefix = 0x00000000UL;
     env->ivor_mask = 0x0000FFF0UL;
     env->ivpr_mask = 0xFFFF0000UL;
     /* Hardware reset vector */
@@ -2644,7 +2642,6 @@  static void init_excp_MPC5xx (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001C00;
     env->excp_vectors[POWERPC_EXCP_MEXTBR]   = 0x00001E00;
     env->excp_vectors[POWERPC_EXCP_NMEXTBR]  = 0x00001F00;
-    env->hreset_excp_prefix = 0x00000000UL;
     env->ivor_mask = 0x0000FFF0UL;
     env->ivpr_mask = 0xFFFF0000UL;
     /* Hardware reset vector */
@@ -2676,7 +2673,6 @@  static void init_excp_MPC8xx (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001C00;
     env->excp_vectors[POWERPC_EXCP_MEXTBR]   = 0x00001E00;
     env->excp_vectors[POWERPC_EXCP_NMEXTBR]  = 0x00001F00;
-    env->hreset_excp_prefix = 0x00000000UL;
     env->ivor_mask = 0x0000FFF0UL;
     env->ivpr_mask = 0xFFFF0000UL;
     /* Hardware reset vector */
@@ -2704,7 +2700,6 @@  static void init_excp_G2 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_DSTLB]    = 0x00001200;
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -2733,7 +2728,6 @@  static void init_excp_e200(CPUPPCState *env, target_ulong ivpr_mask)
     env->excp_vectors[POWERPC_EXCP_SPEU]     = 0x00000000;
     env->excp_vectors[POWERPC_EXCP_EFPDI]    = 0x00000000;
     env->excp_vectors[POWERPC_EXCP_EFPRI]    = 0x00000000;
-    env->hreset_excp_prefix = 0x00000000UL;
     env->ivor_mask = 0x0000FFF7UL;
     env->ivpr_mask = ivpr_mask;
     /* Hardware reset vector */
@@ -2760,7 +2754,6 @@  static void init_excp_BookE (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_DTLB]     = 0x00000000;
     env->excp_vectors[POWERPC_EXCP_ITLB]     = 0x00000000;
     env->excp_vectors[POWERPC_EXCP_DEBUG]    = 0x00000000;
-    env->hreset_excp_prefix = 0x00000000UL;
     env->ivor_mask = 0x0000FFE0UL;
     env->ivpr_mask = 0xFFFF0000UL;
     /* Hardware reset vector */
@@ -2783,7 +2776,6 @@  static void init_excp_601 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_IO]       = 0x00000A00;
     env->excp_vectors[POWERPC_EXCP_SYSCALL]  = 0x00000C00;
     env->excp_vectors[POWERPC_EXCP_RUNM]     = 0x00002000;
-    env->hreset_excp_prefix = 0xFFF00000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0x00000100UL;
 #endif
@@ -2811,7 +2803,6 @@  static void init_excp_602 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
     env->excp_vectors[POWERPC_EXCP_WDT]      = 0x00001500;
     env->excp_vectors[POWERPC_EXCP_EMUL]     = 0x00001600;
-    env->hreset_excp_prefix = 0xFFF00000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -2836,7 +2827,6 @@  static void init_excp_603 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_DSTLB]    = 0x00001200;
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -2859,7 +2849,6 @@  static void init_excp_604 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_PERFM]    = 0x00000F00;
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
-    env->hreset_excp_prefix = 0xFFF00000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0x00000100UL;
 #endif
@@ -2883,7 +2872,6 @@  static void init_excp_7x0 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
     env->excp_vectors[POWERPC_EXCP_THERM]    = 0x00001700;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -2906,7 +2894,6 @@  static void init_excp_750cl (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_PERFM]    = 0x00000F00;
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -2929,7 +2916,6 @@  static void init_excp_750cx (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_PERFM]    = 0x00000F00;
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_THERM]    = 0x00001700;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -2957,7 +2943,6 @@  static void init_excp_7x5 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
     env->excp_vectors[POWERPC_EXCP_THERM]    = 0x00001700;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -2983,7 +2968,6 @@  static void init_excp_7400 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
     env->excp_vectors[POWERPC_EXCP_VPUA]     = 0x00001600;
     env->excp_vectors[POWERPC_EXCP_THERM]    = 0x00001700;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -3011,7 +2995,6 @@  static void init_excp_7450 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_SMI]      = 0x00001400;
     env->excp_vectors[POWERPC_EXCP_VPUA]     = 0x00001600;
-    env->hreset_excp_prefix = 0x00000000UL;
     /* Hardware reset vector */
     env->hreset_vector = 0xFFFFFFFCUL;
 #endif
@@ -3041,7 +3024,6 @@  static void init_excp_970 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_MAINT]    = 0x00001600;
     env->excp_vectors[POWERPC_EXCP_VPUA]     = 0x00001700;
     env->excp_vectors[POWERPC_EXCP_THERM]    = 0x00001800;
-    env->hreset_excp_prefix = 0x00000000FFF00000ULL;
     /* Hardware reset vector */
     env->hreset_vector = 0x0000000000000100ULL;
 #endif
@@ -3070,7 +3052,6 @@  static void init_excp_POWER7 (CPUPPCState *env)
     env->excp_vectors[POWERPC_EXCP_MAINT]    = 0x00001600;
     env->excp_vectors[POWERPC_EXCP_VPUA]     = 0x00001700;
     env->excp_vectors[POWERPC_EXCP_THERM]    = 0x00001800;
-    env->hreset_excp_prefix = 0;
     /* Hardware reset vector */
     env->hreset_vector = 0x0000000000000100ULL;
 #endif
@@ -7043,7 +7024,6 @@  static void init_ppc_proc(PowerPCCPU *cpu)
     /* Set all exception vectors to an invalid address */
     for (i = 0; i < POWERPC_EXCP_NB; i++)
         env->excp_vectors[i] = (target_ulong)(-1ULL);
-    env->hreset_excp_prefix = 0x00000000;
     env->ivor_mask = 0x00000000;
     env->ivpr_mask = 0x00000000;
     /* Default MMU definitions */
@@ -7080,9 +7060,7 @@  static void init_ppc_proc(PowerPCCPU *cpu)
     }
     /* PowerPC implementation specific initialisations (SPRs, timers, ...) */
     (*pcc->init_proc)(env);
-#if !defined(CONFIG_USER_ONLY)
-    env->excp_prefix = env->hreset_excp_prefix;
-#endif
+
     /* MSR bits & flags consistency checks */
     if (env->msr_mask & (1 << 25)) {
         switch (env->flags & (POWERPC_FLAG_SPE | POWERPC_FLAG_VRE)) {
@@ -8182,19 +8160,23 @@  static void ppc_cpu_reset(CPUState *s)
     msr |= (target_ulong)1 << MSR_VR; /* Allow altivec usage */
     msr |= (target_ulong)1 << MSR_SPE; /* Allow SPE usage */
     msr |= (target_ulong)1 << MSR_PR;
-#else
-    env->excp_prefix = env->hreset_excp_prefix;
-    env->nip = env->hreset_vector | env->excp_prefix;
-    if (env->mmu_model != POWERPC_MMU_REAL) {
-        ppc_tlb_invalidate_all(env);
-    }
 #endif
-    env->msr = msr & env->msr_mask;
+
 #if defined(TARGET_PPC64)
     if (env->mmu_model & POWERPC_MMU_64) {
         env->msr |= (1ULL << MSR_SF);
     }
 #endif
+
+    hreg_store_msr(env, msr, 1);
+
+#if !defined(CONFIG_USER_ONLY)
+    env->nip = env->hreset_vector | env->excp_prefix;
+    if (env->mmu_model != POWERPC_MMU_REAL) {
+        ppc_tlb_invalidate_all(env);
+    }
+#endif
+
     hreg_compute_hflags(env);
     env->reserve_addr = (target_ulong)-1ULL;
     /* Be sure no exception or interrupt is pending */