[Qemu-devel] [PATCH v2 3/4] openpic: move IACK to its own function

[Scott Wood <scottwood@freescale.com>]

Besides making the code cleaner, we will need a separate way to access
IACK in order to implement EPR (external proxy) interrupt delivery.

Signed-off-by: Scott Wood <scottwood@freescale.com>
---
v2: rebase on latest code

 hw/openpic.c |   95 ++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 53 insertions(+), 42 deletions(-)

diff --git a/hw/openpic.c b/hw/openpic.c
index 7645d67..374f80e 100644
--- a/hw/openpic.c
+++ b/hw/openpic.c
@@ -975,14 +975,64 @@ static void openpic_cpu_write(void *opaque, hwaddr addr, uint64_t val,
     openpic_cpu_write_internal(opaque, addr, val, (addr & 0x1f000) >> 12);
 }
 
+
+static uint32_t openpic_iack(OpenPICState *opp, IRQDest *dst, int cpu)
+{
+    IRQSource *src;
+    int retval, irq;
+
+    DPRINTF("Lower OpenPIC INT output\n");
+    qemu_irq_lower(dst->irqs[OPENPIC_OUTPUT_INT]);
+
+    irq = IRQ_get_next(opp, &dst->raised);
+    DPRINTF("IACK: irq=%d\n", irq);
+
+    if (irq == -1) {
+        /* No more interrupt pending */
+        return opp->spve;
+    }
+
+    src = &opp->src[irq];
+    if (!(src->ivpr & IVPR_ACTIVITY_MASK) ||
+            !(IVPR_PRIORITY(src->ivpr) > dst->ctpr)) {
+        /* - Spurious level-sensitive IRQ
+         * - Priorities has been changed
+         *   and the pending IRQ isn't allowed anymore
+         */
+        src->ivpr &= ~IVPR_ACTIVITY_MASK;
+        retval = opp->spve;
+    } else {
+        /* IRQ enter servicing state */
+        IRQ_setbit(&dst->servicing, irq);
+        retval = IVPR_VECTOR(opp, src->ivpr);
+    }
+    IRQ_resetbit(&dst->raised, irq);
+    if (!src->level) {
+        /* edge-sensitive IRQ */
+        src->ivpr &= ~IVPR_ACTIVITY_MASK;
+        src->pending = 0;
+    }
+
+    if ((irq >= opp->irq_ipi0) &&  (irq < (opp->irq_ipi0 + MAX_IPI))) {
+        src->idr &= ~(1 << cpu);
+        if (src->idr && !src->level) {
+            /* trigger on CPUs that didn't know about it yet */
+            openpic_set_irq(opp, irq, 1);
+            openpic_set_irq(opp, irq, 0);
+            /* if all CPUs knew about it, set active bit again */
+            src->ivpr |= IVPR_ACTIVITY_MASK;
+        }
+    }
+
+    return retval;
+}
+
 static uint32_t openpic_cpu_read_internal(void *opaque, hwaddr addr,
                                           int idx)
 {
     OpenPICState *opp = opaque;
-    IRQSource *src;
     IRQDest *dst;
     uint32_t retval;
-    int n_IRQ;
 
     DPRINTF("%s: cpu %d addr %#" HWADDR_PRIx "\n", __func__, idx, addr);
     retval = 0xFFFFFFFF;
@@ -1004,46 +1054,7 @@ static uint32_t openpic_cpu_read_internal(void *opaque, hwaddr addr,
         retval = idx;
         break;
     case 0xA0: /* IACK */
-        DPRINTF("Lower OpenPIC INT output\n");
-        qemu_irq_lower(dst->irqs[OPENPIC_OUTPUT_INT]);
-        n_IRQ = IRQ_get_next(opp, &dst->raised);
-        DPRINTF("IACK: irq=%d\n", n_IRQ);
-        if (n_IRQ == -1) {
-            /* No more interrupt pending */
-            retval = opp->spve;
-        } else {
-            src = &opp->src[n_IRQ];
-            if (!(src->ivpr & IVPR_ACTIVITY_MASK) ||
-                !(IVPR_PRIORITY(src->ivpr) > dst->ctpr)) {
-                /* - Spurious level-sensitive IRQ
-                 * - Priorities has been changed
-                 *   and the pending IRQ isn't allowed anymore
-                 */
-                src->ivpr &= ~IVPR_ACTIVITY_MASK;
-                retval = opp->spve;
-            } else {
-                /* IRQ enter servicing state */
-                IRQ_setbit(&dst->servicing, n_IRQ);
-                retval = IVPR_VECTOR(opp, src->ivpr);
-            }
-            IRQ_resetbit(&dst->raised, n_IRQ);
-            if (!src->level) {
-                /* edge-sensitive IRQ */
-                src->ivpr &= ~IVPR_ACTIVITY_MASK;
-                src->pending = 0;
-            }
-
-            if ((n_IRQ >= opp->irq_ipi0) &&  (n_IRQ < (opp->irq_ipi0 + MAX_IPI))) {
-                src->idr &= ~(1 << idx);
-                if (src->idr && !src->level) {
-                    /* trigger on CPUs that didn't know about it yet */
-                    openpic_set_irq(opp, n_IRQ, 1);
-                    openpic_set_irq(opp, n_IRQ, 0);
-                    /* if all CPUs knew about it, set active bit again */
-                    src->ivpr |= IVPR_ACTIVITY_MASK;
-                }
-            }
-        }
+        retval = openpic_iack(opp, dst, idx);
         break;
     case 0xB0: /* EOI */
         retval = 0;
-- 
1.7.9.5