[Qemu-devel] [PATCH 2/7] Add MSR VSX and Associated Exception

[Anton Blanchard <anton@samba.org>]

From: Tom Musta <tommusta@gmail.com>

This patch adds support for the VSX bit of the PowerPC Machine
State Register (MSR) as well as the corresponding VSX Unavailable
exception.

The VSX bit is added to the defined bits masks of the Power7 and
Power8 CPU models.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
---

Index: b/target-ppc/cpu.h
===================================================================
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -236,6 +236,8 @@ enum {
     POWERPC_EXCP_NMEXTBR  = 91, /* Non maskable external breakpoint          */
     POWERPC_EXCP_ITLBE    = 92, /* Instruction TLB error                     */
     POWERPC_EXCP_DTLBE    = 93, /* Data TLB error                            */
+    /* VSX Unavailable (Power ISA 2.06 and later)                            */
+    POWERPC_EXCP_VSXU     = 94, /* VSX Unavailable                           */
     /* EOL                                                                   */
     POWERPC_EXCP_NB       = 96,
     /* QEMU exceptions: used internally during code translation              */
@@ -427,6 +429,7 @@ struct ppc_slb_t {
 #define MSR_VR   25 /* altivec available                            x hflags */
 #define MSR_SPE  25 /* SPE enable for BookE                         x hflags */
 #define MSR_AP   23 /* Access privilege state on 602                  hflags */
+#define MSR_VSX  23 /* Vector Scalar Extension (ISA 2.06 and later) x hflags */
 #define MSR_SA   22 /* Supervisor access mode on 602                  hflags */
 #define MSR_KEY  19 /* key bit on 603e                                       */
 #define MSR_POW  18 /* Power management                                      */
@@ -467,6 +470,7 @@ struct ppc_slb_t {
 #define msr_vr   ((env->msr >> MSR_VR)   & 1)
 #define msr_spe  ((env->msr >> MSR_SPE)  & 1)
 #define msr_ap   ((env->msr >> MSR_AP)   & 1)
+#define msr_vsx  ((env->msr >> MSR_VSX)  & 1)
 #define msr_sa   ((env->msr >> MSR_SA)   & 1)
 #define msr_key  ((env->msr >> MSR_KEY)  & 1)
 #define msr_pow  ((env->msr >> MSR_POW)  & 1)
Index: b/target-ppc/excp_helper.c
===================================================================
--- a/target-ppc/excp_helper.c
+++ b/target-ppc/excp_helper.c
@@ -390,6 +390,11 @@ static inline void powerpc_excp(PowerPCC
             new_msr |= (target_ulong)MSR_HVB;
         }
         goto store_current;
+    case POWERPC_EXCP_VSXU:       /* VSX unavailable exception               */
+        if (lpes1 == 0) {
+            new_msr |= (target_ulong)MSR_HVB;
+        }
+        goto store_current;
     case POWERPC_EXCP_PIT:       /* Programmable interval timer interrupt    */
         LOG_EXCP("PIT exception\n");
         goto store_next;
Index: b/target-ppc/translate.c
===================================================================
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -199,6 +199,7 @@ typedef struct DisasContext {
 #endif
     int fpu_enabled;
     int altivec_enabled;
+    int vsx_enabled;
     int spe_enabled;
     ppc_spr_t *spr_cb; /* Needed to check rights for mfspr/mtspr */
     int singlestep_enabled;
@@ -9763,6 +9764,11 @@ static inline void gen_intermediate_code
         ctx.altivec_enabled = msr_vr;
     else
         ctx.altivec_enabled = 0;
+    if ((env->flags & POWERPC_FLAG_VSX) && msr_vsx) {
+        ctx.vsx_enabled = msr_vsx;
+    } else {
+        ctx.vsx_enabled = 0;
+    }
     if ((env->flags & POWERPC_FLAG_SE) && msr_se)
         ctx.singlestep_enabled = CPU_SINGLE_STEP;
     else
Index: b/target-ppc/translate_init.c
===================================================================
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -3061,6 +3061,7 @@ static void init_excp_POWER7 (CPUPPCStat
     env->excp_vectors[POWERPC_EXCP_TRACE]    = 0x00000D00;
     env->excp_vectors[POWERPC_EXCP_PERFM]    = 0x00000F00;
     env->excp_vectors[POWERPC_EXCP_VPU]      = 0x00000F20;
+    env->excp_vectors[POWERPC_EXCP_VSXU]     = 0x00000F40;
     env->excp_vectors[POWERPC_EXCP_IABR]     = 0x00001300;
     env->excp_vectors[POWERPC_EXCP_MAINT]    = 0x00001600;
     env->excp_vectors[POWERPC_EXCP_VPUA]     = 0x00001700;
@@ -7232,7 +7233,7 @@ POWERPC_FAMILY(POWER7)(ObjectClass *oc,
                        PPC_SEGMENT_64B | PPC_SLBI |
                        PPC_POPCNTB | PPC_POPCNTWD;
     pcc->insns_flags2 = PPC2_VSX | PPC2_DFP | PPC2_DBRX | PPC2_ISA205;
-    pcc->msr_mask = 0x800000000204FF37ULL;
+    pcc->msr_mask = 0x800000000284FF37ULL;
     pcc->mmu_model = POWERPC_MMU_2_06;
 #if defined(CONFIG_SOFTMMU)
     pcc->handle_mmu_fault = ppc_hash64_handle_mmu_fault;
@@ -7267,7 +7268,7 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc,
                        PPC_SEGMENT_64B | PPC_SLBI |
                        PPC_POPCNTB | PPC_POPCNTWD;
     pcc->insns_flags2 = PPC2_VSX | PPC2_DFP | PPC2_DBRX;
-    pcc->msr_mask = 0x800000000204FF36ULL;
+    pcc->msr_mask = 0x800000000284FF36ULL;
     pcc->mmu_model = POWERPC_MMU_2_06;
 #if defined(CONFIG_SOFTMMU)
     pcc->handle_mmu_fault = ppc_hash64_handle_mmu_fault;