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-rw-r--r--qemu/hw/core/irq.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/qemu/hw/core/irq.c b/qemu/hw/core/irq.c
new file mode 100644
index 000000000..8a62a36d5
--- /dev/null
+++ b/qemu/hw/core/irq.c
@@ -0,0 +1,158 @@
+/*
+ * 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"
+#include "qom/object.h"
+
+#define IRQ(obj) OBJECT_CHECK(struct IRQState, (obj), TYPE_IRQ)
+
+struct IRQState {
+ Object parent_obj;
+
+ 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;
+ int i;
+
+ if (!old) {
+ n_old = 0;
+ }
+ s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
+ for (i = n_old; i < n + n_old; i++) {
+ s[i] = qemu_allocate_irq(handler, opaque, i);
+ }
+ return s;
+}
+
+qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
+{
+ return qemu_extend_irqs(NULL, 0, handler, opaque, n);
+}
+
+qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
+{
+ struct IRQState *irq;
+
+ irq = IRQ(object_new(TYPE_IRQ));
+ irq->handler = handler;
+ irq->opaque = opaque;
+ irq->n = n;
+
+ return irq;
+}
+
+void qemu_free_irqs(qemu_irq *s, int n)
+{
+ int i;
+ for (i = 0; i < n; i++) {
+ qemu_free_irq(s[i]);
+ }
+ g_free(s);
+}
+
+void qemu_free_irq(qemu_irq irq)
+{
+ object_unref(OBJECT(irq));
+}
+
+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_irq(qemu_notirq, irq, 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_irq(qemu_splitirq, s, 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[i];
+ }
+}
+
+static const TypeInfo irq_type_info = {
+ .name = TYPE_IRQ,
+ .parent = TYPE_OBJECT,
+ .instance_size = sizeof(struct IRQState),
+};
+
+static void irq_register_types(void)
+{
+ type_register_static(&irq_type_info);
+}
+
+type_init(irq_register_types)