1 files changed, 136 insertions, 0 deletions
diff --git a/hw/core/irq.c b/hw/core/irq.c
new file mode 100644
index 0000000000..20785428ef
--- /dev/null
+++ b/hw/core/irq.c
@@ -0,0 +1,136 @@
+/*
+ * 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 "hw/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_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
+                           void *opaque, int n)
+{
+    qemu_irq *s;
+    struct IRQState *p;
+    int i;
+
+    if (!old) {
+        n_old = 0;
+    }
+    s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
+    p = old ? g_renew(struct IRQState, s[0], n + n_old) :
+                g_new(struct IRQState, n);
+    for (i = 0; i < n + n_old; i++) {
+        if (i >= n_old) {
+            p->handler = handler;
+            p->opaque = opaque;
+            p->n = i;
+        }
+        s[i] = p;
+        p++;
+    }
+    return s;
+}
+
+qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
+{
+    return qemu_extend_irqs(NULL, 0, handler, opaque, n);
+}
+
+
+void qemu_free_irqs(qemu_irq *s)
+{
+    g_free(s[0]);
+    g_free(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];
+}
+
+static void qemu_splitirq(void *opaque, int line, int level)
+{
+    struct IRQState **irq = opaque;
+    irq[0]->handler(irq[0]->opaque, irq[0]->n, level);
+    irq[1]->handler(irq[1]->opaque, irq[1]->n, level);
+}
+
+qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
+{
+    qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq));
+    s[0] = irq1;
+    s[1] = irq2;
+    return qemu_allocate_irqs(qemu_splitirq, s, 1)[0];
+}
+
+static void proxy_irq_handler(void *opaque, int n, int level)
+{
+    qemu_irq **target = opaque;
+
+    if (*target) {
+        qemu_set_irq((*target)[n], level);
+    }
+}
+
+qemu_irq *qemu_irq_proxy(qemu_irq **target, int n)
+{
+    return qemu_allocate_irqs(proxy_irq_handler, target, n);
+}
+
+void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
+{
+    int i;
+    qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
+    for (i = 0; i < n; i++) {
+        *old_irqs[i] = *gpio_in[i];
+        gpio_in[i]->handler = handler;
+        gpio_in[i]->opaque = old_irqs;
+    }
+}
+
+void qemu_irq_intercept_out(qemu_irq **gpio_out, qemu_irq_handler handler, int n)
+{
+    qemu_irq *old_irqs = *gpio_out;
+    *gpio_out = qemu_allocate_irqs(handler, old_irqs, n);
+}