auto import from //depot/cupcake/@135843

1 files changed, 71 insertions, 0 deletions

diff --git a/hw/irq.c b/hw/irq.c
new file mode 100644
index 0000000..eca707d
--- /dev/null
+++ b/hw/irq.c
@@ -0,0 +1,71 @@
+/*
+ * QEMU IRQ/GPIO common code.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu-common.h"
+#include "irq.h"
+
+struct IRQState {
+    qemu_irq_handler handler;
+    void *opaque;
+    int n;
+};
+
+void qemu_set_irq(qemu_irq irq, int level)
+{
+    if (!irq)
+        return;
+
+    irq->handler(irq->opaque, irq->n, level);
+}
+
+qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
+{
+    qemu_irq *s;
+    struct IRQState *p;
+    int i;
+
+    s = (qemu_irq *)qemu_mallocz(sizeof(qemu_irq) * n);
+    p = (struct IRQState *)qemu_mallocz(sizeof(struct IRQState) * n);
+    for (i = 0; i < n; i++) {
+        p->handler = handler;
+        p->opaque = opaque;
+        p->n = i;
+        s[i] = p;
+        p++;
+    }
+    return s;
+}
+
+static void qemu_notirq(void *opaque, int line, int level)
+{
+    struct IRQState *irq = opaque;
+
+    irq->handler(irq->opaque, irq->n, !level);
+}
+
+qemu_irq qemu_irq_invert(qemu_irq irq)
+{
+    /* The default state for IRQs is low, so raise the output now.  */
+    qemu_irq_raise(irq);
+    return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
+}