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/*
* ARM GIC support - common bits of emulated and KVM kernel model
*
* Copyright (c) 2012 Linaro Limited
* Written by Peter Maydell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "arm_gic_internal.h"
static void gic_save(QEMUFile *f, void *opaque)
{
gic_state *s = (gic_state *)opaque;
ARMGICCommonClass *c = ARM_GIC_COMMON_GET_CLASS(s);
int i;
int j;
if (c->pre_save) {
c->pre_save(s);
}
qemu_put_be32(f, s->enabled);
for (i = 0; i < s->num_cpu; i++) {
qemu_put_be32(f, s->cpu_enabled[i]);
for (j = 0; j < GIC_INTERNAL; j++) {
qemu_put_be32(f, s->priority1[j][i]);
}
for (j = 0; j < s->num_irq; j++) {
qemu_put_be32(f, s->last_active[j][i]);
}
qemu_put_be32(f, s->priority_mask[i]);
qemu_put_be32(f, s->running_irq[i]);
qemu_put_be32(f, s->running_priority[i]);
qemu_put_be32(f, s->current_pending[i]);
}
for (i = 0; i < s->num_irq - GIC_INTERNAL; i++) {
qemu_put_be32(f, s->priority2[i]);
}
for (i = 0; i < s->num_irq; i++) {
qemu_put_be32(f, s->irq_target[i]);
qemu_put_byte(f, s->irq_state[i].enabled);
qemu_put_byte(f, s->irq_state[i].pending);
qemu_put_byte(f, s->irq_state[i].active);
qemu_put_byte(f, s->irq_state[i].level);
qemu_put_byte(f, s->irq_state[i].model);
qemu_put_byte(f, s->irq_state[i].trigger);
}
}
static int gic_load(QEMUFile *f, void *opaque, int version_id)
{
gic_state *s = (gic_state *)opaque;
ARMGICCommonClass *c = ARM_GIC_COMMON_GET_CLASS(s);
int i;
int j;
if (version_id != 3) {
return -EINVAL;
}
s->enabled = qemu_get_be32(f);
for (i = 0; i < s->num_cpu; i++) {
s->cpu_enabled[i] = qemu_get_be32(f);
for (j = 0; j < GIC_INTERNAL; j++) {
s->priority1[j][i] = qemu_get_be32(f);
}
for (j = 0; j < s->num_irq; j++) {
s->last_active[j][i] = qemu_get_be32(f);
}
s->priority_mask[i] = qemu_get_be32(f);
s->running_irq[i] = qemu_get_be32(f);
s->running_priority[i] = qemu_get_be32(f);
s->current_pending[i] = qemu_get_be32(f);
}
for (i = 0; i < s->num_irq - GIC_INTERNAL; i++) {
s->priority2[i] = qemu_get_be32(f);
}
for (i = 0; i < s->num_irq; i++) {
s->irq_target[i] = qemu_get_be32(f);
s->irq_state[i].enabled = qemu_get_byte(f);
s->irq_state[i].pending = qemu_get_byte(f);
s->irq_state[i].active = qemu_get_byte(f);
s->irq_state[i].level = qemu_get_byte(f);
s->irq_state[i].model = qemu_get_byte(f);
s->irq_state[i].trigger = qemu_get_byte(f);
}
if (c->post_load) {
c->post_load(s);
}
return 0;
}
static int arm_gic_common_init(SysBusDevice *dev)
{
gic_state *s = FROM_SYSBUS(gic_state, dev);
int num_irq = s->num_irq;
if (s->num_cpu > NCPU) {
hw_error("requested %u CPUs exceeds GIC maximum %d\n",
s->num_cpu, NCPU);
}
s->num_irq += GIC_BASE_IRQ;
if (s->num_irq > GIC_MAXIRQ) {
hw_error("requested %u interrupt lines exceeds GIC maximum %d\n",
num_irq, GIC_MAXIRQ);
}
/* ITLinesNumber is represented as (N / 32) - 1 (see
* gic_dist_readb) so this is an implementation imposed
* restriction, not an architectural one:
*/
if (s->num_irq < 32 || (s->num_irq % 32)) {
hw_error("%d interrupt lines unsupported: not divisible by 32\n",
num_irq);
}
register_savevm(NULL, "arm_gic", -1, 3, gic_save, gic_load, s);
return 0;
}
static void arm_gic_common_reset(DeviceState *dev)
{
gic_state *s = FROM_SYSBUS(gic_state, sysbus_from_qdev(dev));
int i;
memset(s->irq_state, 0, GIC_MAXIRQ * sizeof(gic_irq_state));
for (i = 0 ; i < s->num_cpu; i++) {
s->priority_mask[i] = 0xf0;
s->current_pending[i] = 1023;
s->running_irq[i] = 1023;
s->running_priority[i] = 0x100;
s->cpu_enabled[i] = 0;
}
for (i = 0; i < 16; i++) {
GIC_SET_ENABLED(i, ALL_CPU_MASK);
GIC_SET_TRIGGER(i);
}
if (s->num_cpu == 1) {
/* For uniprocessor GICs all interrupts always target the sole CPU */
for (i = 0; i < GIC_MAXIRQ; i++) {
s->irq_target[i] = 1;
}
}
s->enabled = 0;
}
static Property arm_gic_common_properties[] = {
DEFINE_PROP_UINT32("num-cpu", gic_state, num_cpu, 1),
DEFINE_PROP_UINT32("num-irq", gic_state, num_irq, 32),
/* Revision can be 1 or 2 for GIC architecture specification
* versions 1 or 2, or 0 to indicate the legacy 11MPCore GIC.
* (Internally, 0xffffffff also indicates "not a GIC but an NVIC".)
*/
DEFINE_PROP_UINT32("revision", gic_state, revision, 1),
DEFINE_PROP_END_OF_LIST(),
};
static void arm_gic_common_class_init(ObjectClass *klass, void *data)
{
SysBusDeviceClass *sc = SYS_BUS_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = arm_gic_common_reset;
dc->props = arm_gic_common_properties;
dc->no_user = 1;
sc->init = arm_gic_common_init;
}
static TypeInfo arm_gic_common_type = {
.name = TYPE_ARM_GIC_COMMON,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(gic_state),
.class_size = sizeof(ARMGICCommonClass),
.class_init = arm_gic_common_class_init,
.abstract = true,
};
static void register_types(void)
{
type_register_static(&arm_gic_common_type);
}
type_init(register_types)
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