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// SPDX-License-Identifier: GPL-2.0
/*
* ARM Generic Interrupt Controller (GIC) support
*/
#include <errno.h>
#include <linux/bits.h>
#include <linux/sizes.h>
#include "kvm_util.h"
#include <gic.h>
#include "gic_private.h"
#include "processor.h"
#include "spinlock.h"
static const struct gic_common_ops *gic_common_ops;
static struct spinlock gic_lock;
static void gic_cpu_init(unsigned int cpu, void *redist_base)
{
gic_common_ops->gic_cpu_init(cpu, redist_base);
}
static void
gic_dist_init(enum gic_type type, unsigned int nr_cpus, void *dist_base)
{
const struct gic_common_ops *gic_ops = NULL;
spin_lock(&gic_lock);
/* Distributor initialization is needed only once per VM */
if (gic_common_ops) {
spin_unlock(&gic_lock);
return;
}
if (type == GIC_V3)
gic_ops = &gicv3_ops;
GUEST_ASSERT(gic_ops);
gic_ops->gic_init(nr_cpus, dist_base);
gic_common_ops = gic_ops;
/* Make sure that the initialized data is visible to all the vCPUs */
dsb(sy);
spin_unlock(&gic_lock);
}
void gic_init(enum gic_type type, unsigned int nr_cpus,
void *dist_base, void *redist_base)
{
uint32_t cpu = guest_get_vcpuid();
GUEST_ASSERT(type < GIC_TYPE_MAX);
GUEST_ASSERT(dist_base);
GUEST_ASSERT(redist_base);
GUEST_ASSERT(nr_cpus);
gic_dist_init(type, nr_cpus, dist_base);
gic_cpu_init(cpu, redist_base);
}
void gic_irq_enable(unsigned int intid)
{
GUEST_ASSERT(gic_common_ops);
gic_common_ops->gic_irq_enable(intid);
}
void gic_irq_disable(unsigned int intid)
{
GUEST_ASSERT(gic_common_ops);
gic_common_ops->gic_irq_disable(intid);
}
unsigned int gic_get_and_ack_irq(void)
{
uint64_t irqstat;
unsigned int intid;
GUEST_ASSERT(gic_common_ops);
irqstat = gic_common_ops->gic_read_iar();
intid = irqstat & GENMASK(23, 0);
return intid;
}
void gic_set_eoi(unsigned int intid)
{
GUEST_ASSERT(gic_common_ops);
gic_common_ops->gic_write_eoir(intid);
}
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