diff options
Diffstat (limited to 'src/hw/core/irq.c')
| -rw-r--r-- | src/hw/core/irq.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/hw/core/irq.c b/src/hw/core/irq.c new file mode 100644 index 0000000..8a62a36 --- /dev/null +++ b/src/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) |
