SPARC LEON power-down support added

Signed-off-by: NRonald Hecht <address@hidden>
Signed-off-by: NFabien Chouteau <chouteau@adacore.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

target-sparc/cpu.c

@@ -586,7 +586,7 @@ static const sparc_def_t sparc_defs[] = {
         .mmu_trcr_mask = 0xffffffff,
         .nwindows = 8,
         .features = CPU_DEFAULT_FEATURES | CPU_FEATURE_TA0_SHUTDOWN |
-        CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL,
+        CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL | CPU_FEATURE_POWERDOWN,
     },
 #endif
 };

target-sparc/cpu.h

@@ -270,6 +270,7 @@ typedef struct sparc_def_t {
 #define CPU_FEATURE_TA0_SHUTDOWN (1 << 14) /* Shutdown on "ta 0x0" */
 #define CPU_FEATURE_ASR17        (1 << 15)
 #define CPU_FEATURE_CACHE_CTRL   (1 << 16)
+#define CPU_FEATURE_POWERDOWN    (1 << 17)
 
 #ifndef TARGET_SPARC64
 #define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP |  \

target-sparc/helper.c

@@ -225,3 +225,14 @@ target_ulong helper_tsubcctv(CPUSPARCState *env, target_ulong src1,
     cpu_restore_state(env, GETPC());
     helper_raise_exception(env, TT_TOVF);
 }
+
+#ifndef TARGET_SPARC64
+void helper_power_down(CPUSPARCState *env)
+{
+    env->halted = 1;
+    env->exception_index = EXCP_HLT;
+    env->pc = env->npc;
+    env->npc = env->pc + 4;
+    cpu_loop_exit(env);
+}
+#endif

target-sparc/helper.h

@@ -4,6 +4,7 @@
 DEF_HELPER_1(rett, void, env)
 DEF_HELPER_2(wrpsr, void, env, tl)
 DEF_HELPER_1(rdpsr, tl, env)
+DEF_HELPER_1(power_down, void, env)
 #else
 DEF_HELPER_2(wrpil, void, env, tl)
 DEF_HELPER_2(wrpstate, void, env, tl)

target-sparc/translate.c

@@ -3642,6 +3642,11 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                                                    in the SPARCv8
                                                    manual, nop on the
                                                    microSPARC II */
+                                if ((rd == 0x13) && (dc->def->features &
+                                                     CPU_FEATURE_POWERDOWN)) {
+                                    /* LEON3 power-down */
+                                    gen_helper_power_down(cpu_env);
+                                }
                                 break;
 #else
                             case 0x2: /* V9 wrccr */