Implement Process Priority Register as defined in the PowerPC 2.04 spec.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3282 c046a42c-6fe2-441c-8c8c-71466251a162

target-ppc/op.c

@@ -295,6 +295,14 @@ void OPPROTO op_store_xer (void)
     RETURN();
 }
 
+#if defined(TARGET_PPC64)
+void OPPROTO op_store_pri (void)
+{
+    do_store_pri(PARAM1);
+    RETURN();
+}
+#endif
+
 #if !defined(CONFIG_USER_ONLY)
 /* Segment registers load and store */
 void OPPROTO op_load_sr (void)

target-ppc/op_helper.c

@@ -112,6 +112,14 @@ void do_store_xer (void)
     xer_bc = (T0 >> XER_BC) & 0x7F;
 }
 
+#if defined(TARGET_PPC64)
+void do_store_pri (int prio)
+{
+    env->spr[SPR_PPR] &= ~0x001C000000000000ULL;
+    env->spr[SPR_PPR] |= ((uint64_t)prio & 0x7) << 50;
+}
+#endif
+
 void do_load_fpscr (void)
 {
     /* The 32 MSB of the target fpr are undefined.

target-ppc/op_helper.h

@@ -57,6 +57,9 @@ void do_load_cr (void);
 void do_store_cr (uint32_t mask);
 void do_load_xer (void);
 void do_store_xer (void);
+#if defined(TARGET_PPC64)
+void do_store_pri (int prio);
+#endif
 void do_load_fpscr (void);
 void do_store_fpscr (uint32_t mask);
 target_ulong ppc_load_dump_spr (int sprn);

target-ppc/translate.c

@@ -1124,6 +1124,26 @@ GEN_HANDLER(or, 0x1F, 0x1C, 0x0D, 0x00000000, PPC_INTEGER)
     } else if (unlikely(Rc(ctx->opcode) != 0)) {
         gen_op_load_gpr_T0(rs);
         gen_set_Rc0(ctx);
+#if defined(TARGET_PPC64)
+    } else {
+        switch (rs) {
+        case 1:
+            /* Set process priority to low */
+            gen_op_store_pri(2);
+            break;
+        case 6:
+            /* Set process priority to medium-low */
+            gen_op_store_pri(3);
+            break;
+        case 2:
+            /* Set process priority to normal */
+            gen_op_store_pri(4);
+            break;
+        default:
+            /* nop */
+            break;
+        }
+#endif
     }
 }