Fix Sparc32 interrupt handling

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3110 c046a42c-6fe2-441c-8c8c-71466251a162

cpu-exec.c

@@ -461,6 +461,9 @@ int cpu_exec(CPUState *env1)
 			    env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 			    do_interrupt(env->interrupt_index);
 			    env->interrupt_index = 0;
+#if !defined(TARGET_SPARC64) && !defined(CONFIG_USER_ONLY)
+                            cpu_check_irqs(env);
+#endif
 #if defined(__sparc__) && !defined(HOST_SOLARIS)
                             tmp_T0 = 0;
 #else

hw/slavio_intctl.c

@@ -104,6 +104,7 @@ static void slavio_intctl_mem_writel(void *opaque, target_phys_addr_t addr, uint
 	    val |= 80000000;
 	val &= 0xfffe0000;
 	s->intreg_pending[cpu] &= ~val;
+        slavio_check_interrupts(s);
 	DPRINTF("Cleared cpu %d irq mask %x, curmask %x\n", cpu, val, s->intreg_pending[cpu]);
 	break;
     case 2: // set softint
@@ -175,10 +176,12 @@ static void slavio_intctlm_mem_writel(void *opaque, target_phys_addr_t addr, uin
 	val &= ~0x4fb2007f;
 	s->intregm_disabled |= val;
 	s->intregm_pending &= ~val;
+        slavio_check_interrupts(s);
 	DPRINTF("Disabled master irq mask %x, curmask %x\n", val, s->intregm_disabled);
 	break;
     case 4:
 	s->target_cpu = val & (MAX_CPUS - 1);
+        slavio_check_interrupts(s);
 	DPRINTF("Set master irq cpu %d\n", s->target_cpu);
 	break;
     default:
@@ -227,53 +230,36 @@ void slavio_irq_info(void *opaque)
 #endif
 }
 
-static void raise_pil(SLAVIO_INTCTLState *s, unsigned int pil,
-                      unsigned int cpu)
-{
-    qemu_irq irq;
-    unsigned int oldmax;
-
-    irq = s->cpu_irqs[cpu][pil];
-
-#ifdef DEBUG_IRQ_COUNT
-    s->irq_count[pil]++;
-#endif
-    oldmax = s->pil_out[cpu];
-    if (oldmax > 0 && oldmax != pil)
-        qemu_irq_lower(s->cpu_irqs[cpu][oldmax]);
-    s->pil_out[cpu] = pil;
-    if (pil > 0)
-        qemu_irq_raise(irq);
-    DPRINTF("cpu %d pil %d\n", cpu, pil);
-}
-
 static void slavio_check_interrupts(void *opaque)
 {
     SLAVIO_INTCTLState *s = opaque;
-    uint32_t pending = s->intregm_pending;
-    unsigned int i, j, max = 0;
+    uint32_t pending = s->intregm_pending, pil_pending;
+    unsigned int i, j;
 
     pending &= ~s->intregm_disabled;
 
     DPRINTF("pending %x disabled %x\n", pending, s->intregm_disabled);
     for (i = 0; i < MAX_CPUS; i++) {
-        max = 0;
+        pil_pending = 0;
         if (pending && !(s->intregm_disabled & 0x80000000) &&
             (i == s->target_cpu)) {
             for (j = 0; j < 32; j++) {
-                if (pending & (1 << j)) {
-                    if (max < s->intbit_to_level[j])
-                        max = s->intbit_to_level[j];
-                }
+                if (pending & (1 << j))
+                    pil_pending |= 1 << s->intbit_to_level[j];
             }
         }
-        for (j = 17; j < 32; j++) {
-            if (s->intreg_pending[i] & (1 << j)) {
-                if (max < j - 16)
-                    max = j - 16;
+        pil_pending |= (s->intreg_pending[i] >> 16) & 0xfffe;
+
+        for (j = 0; j < MAX_PILS; j++) {
+            if (pil_pending & (1 << j)) {
+                if (!(s->pil_out[i] & (1 << j)))
+                    qemu_irq_raise(s->cpu_irqs[i][j]);
+            } else {
+                if (s->pil_out[i] & (1 << j))
+                    qemu_irq_lower(s->cpu_irqs[i][j]);
             }
         }
-        raise_pil(s, max, i);
+        s->pil_out[i] = pil_pending;
     }
 }
 
@@ -291,6 +277,9 @@ static void slavio_set_irq(void *opaque, int irq, int level)
             level);
     if (pil > 0) {
         if (level) {
+#ifdef DEBUG_IRQ_COUNT
+            s->irq_count[pil]++;
+#endif
             s->intregm_pending |= mask;
             s->intreg_pending[s->target_cpu] |= 1 << pil;
         } else {
@@ -342,6 +331,7 @@ static int slavio_intctl_load(QEMUFile *f, void *opaque, int version_id)
     qemu_get_be32s(f, &s->intregm_pending);
     qemu_get_be32s(f, &s->intregm_disabled);
     qemu_get_be32s(f, &s->target_cpu);
+    slavio_check_interrupts(s);
     return 0;
 }
 
@@ -356,6 +346,7 @@ static void slavio_intctl_reset(void *opaque)
     s->intregm_disabled = ~0xffb2007f;
     s->intregm_pending = 0;
     s->target_cpu = 0;
+    slavio_check_interrupts(s);
 }
 
 void *slavio_intctl_init(target_phys_addr_t addr, target_phys_addr_t addrg,

hw/sun4m.c

@@ -240,26 +240,41 @@ void irq_info()
     slavio_irq_info(slavio_intctl);
 }
 
+void cpu_check_irqs(CPUState *env)
+{
+    if (env->pil_in && (env->interrupt_index == 0 ||
+                        (env->interrupt_index & ~15) == TT_EXTINT)) {
+        unsigned int i;
+
+        for (i = 15; i > 0; i--) {
+            if (env->pil_in & (1 << i)) {
+                int old_interrupt = env->interrupt_index;
+
+                env->interrupt_index = TT_EXTINT | i;
+                if (old_interrupt != env->interrupt_index)
+                    cpu_interrupt(env, CPU_INTERRUPT_HARD);
+                break;
+            }
+        }
+    } else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
+        env->interrupt_index = 0;
+        cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
+    }
+}
+
 static void cpu_set_irq(void *opaque, int irq, int level)
 {
     CPUState *env = opaque;
 
     if (level) {
         DPRINTF("Raise CPU IRQ %d\n", irq);
-
         env->halted = 0;
-
-        if (env->interrupt_index == 0 ||
-            ((env->interrupt_index & ~15) == TT_EXTINT &&
-             (env->interrupt_index & 15) < irq)) {
-            env->interrupt_index = TT_EXTINT | irq;
-            cpu_interrupt(env, CPU_INTERRUPT_HARD);
-        } else {
-            DPRINTF("Not triggered, pending exception %d\n",
-                    env->interrupt_index);
-        }
+        env->pil_in |= 1 << irq;
+        cpu_check_irqs(env);
     } else {
         DPRINTF("Lower CPU IRQ %d\n", irq);
+        env->pil_in &= ~(1 << irq);
+        cpu_check_irqs(env);
     }
 }
 

target-sparc/cpu.h

@@ -181,7 +181,8 @@ typedef struct CPUSPARCState {
     int      psrs;     /* supervisor mode (extracted from PSR) */
     int      psrps;    /* previous supervisor mode */
     int      psret;    /* enable traps */
-    uint32_t psrpil;   /* interrupt level */
+    uint32_t psrpil;   /* interrupt blocking level */
+    uint32_t pil_in;   /* incoming interrupt level bitmap */
     int      psref;    /* enable fpu */
     target_ulong version;
     jmp_buf  jmp_env;
@@ -306,6 +307,7 @@ void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
 void do_tick_set_count(void *opaque, uint64_t count);
 uint64_t do_tick_get_count(void *opaque);
 void do_tick_set_limit(void *opaque, uint64_t limit);
+void cpu_check_irqs(CPUSPARCState *env);
 
 #define CPUState CPUSPARCState
 #define cpu_init cpu_sparc_init