better halted state support

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1652 c046a42c-6fe2-441c-8c8c-71466251a162

cpu-defs.h

@@ -74,7 +74,7 @@ typedef unsigned long ram_addr_t;
 #define EXCP_INTERRUPT 	0x10000 /* async interruption */
 #define EXCP_HLT        0x10001 /* hlt instruction reached */
 #define EXCP_DEBUG      0x10002 /* cpu stopped after a breakpoint or singlestep */
-
+#define EXCP_HALTED     0x10003 /* cpu is halted (waiting for external event) */
 #define MAX_BREAKPOINTS 32
 
 #define TB_JMP_CACHE_BITS 12
@@ -96,7 +96,6 @@ typedef struct CPUTLBEntry {
 
 #define CPU_COMMON                                                      \
     struct TranslationBlock *current_tb; /* currently executing TB  */  \
-    int cpu_halted; /* TRUE if cpu is halted (sleep mode) */            \
     /* soft mmu support */                                              \
     /* in order to avoid passing too many arguments to the memory       \
        write helpers, we store some rarely used information in the CPU  \

cpu-exec.c

@@ -251,6 +251,19 @@ int cpu_exec(CPUState *env1)
     TranslationBlock *tb;
     uint8_t *tc_ptr;
 
+#if defined(TARGET_I386)
+    /* handle exit of HALTED state */
+    if (env1->hflags & HF_HALTED_MASK) {
+        /* disable halt condition */
+        if ((env1->interrupt_request & CPU_INTERRUPT_HARD) &&
+            (env1->eflags & IF_MASK)) {
+            env1->hflags &= ~HF_HALTED_MASK;
+        } else {
+            return EXCP_HALTED;
+        }
+    }
+#endif
+
     cpu_single_env = env1; 
 
     /* first we save global registers */