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* ARM GIC support
* 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
* 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 <>.
#include "hw/sysbus.h"
/* Maximum number of possible interrupts, determined by the GIC architecture */
#define GIC_MAXIRQ 1020
/* First 32 are private to each CPU (SGIs and PPIs). */
#define GIC_INTERNAL 32
#define GIC_NR_SGIS 16
/* Maximum number of possible CPU interfaces, determined by GIC architecture */
#define GIC_NCPU 8
/* Maximum number of possible CPU interfaces with their respective vCPU */
#define GIC_NCPU_VCPU (GIC_NCPU * 2)
#define MAX_NR_GROUP_PRIO 128
#define GIC_MIN_BPR 0
#define GIC_MIN_ABPR (GIC_MIN_BPR + 1)
/* Architectural maximum number of list registers in the virtual interface */
#define GIC_MAX_LR 64
/* Only 32 priority levels and 32 preemption levels in the vCPU interfaces */
#define GIC_VIRT_MIN_BPR 2
typedef struct gic_irq_state {
/* The enable bits are only banked for per-cpu interrupts. */
uint8_t enabled;
uint8_t pending;
uint8_t active;
uint8_t level;
bool model; /* 0 = N:N, 1 = 1:N */
bool edge_trigger; /* true: edge-triggered, false: level-triggered */
uint8_t group;
} gic_irq_state;
typedef struct GICState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
qemu_irq parent_irq[GIC_NCPU];
qemu_irq parent_fiq[GIC_NCPU];
qemu_irq parent_virq[GIC_NCPU];
qemu_irq parent_vfiq[GIC_NCPU];
qemu_irq maintenance_irq[GIC_NCPU];
/* GICD_CTLR; for a GIC with the security extensions the NS banked version
* of this register is just an alias of bit 1 of the S banked version.
uint32_t ctlr;
/* GICC_CTLR; again, the NS banked version is just aliases of bits of
* the S banked register, so our state only needs to store the S version.
uint32_t cpu_ctlr[GIC_NCPU_VCPU];
gic_irq_state irq_state[GIC_MAXIRQ];
uint8_t irq_target[GIC_MAXIRQ];
uint8_t priority1[GIC_INTERNAL][GIC_NCPU];
uint8_t priority2[GIC_MAXIRQ - GIC_INTERNAL];
/* For each SGI on the target CPU, we store 8 bits
* indicating which source CPUs have made this SGI
* pending on the target CPU. These correspond to
* the bytes in the GIC_SPENDSGIR* registers as
* read by the target CPU.
uint8_t sgi_pending[GIC_NR_SGIS][GIC_NCPU];
uint16_t priority_mask[GIC_NCPU_VCPU];
uint16_t running_priority[GIC_NCPU_VCPU];
uint16_t current_pending[GIC_NCPU_VCPU];
uint32_t n_prio_bits;
/* If we present the GICv2 without security extensions to a guest,
* the guest can configure the GICC_CTLR to configure group 1 binary point
* in the abpr.
* For a GIC with Security Extensions we use use bpr for the
* secure copy and abpr as storage for the non-secure copy of the register.
uint8_t bpr[GIC_NCPU_VCPU];
uint8_t abpr[GIC_NCPU_VCPU];
/* The APR is implementation defined, so we choose a layout identical to
* the KVM ABI layout for QEMU's implementation of the gic:
* If an interrupt for preemption level X is active, then
* APRn[X mod 32] == 0b1, where n = X / 32
* otherwise the bit is clear.
uint32_t apr[GIC_NR_APRS][GIC_NCPU];
uint32_t nsapr[GIC_NR_APRS][GIC_NCPU];
/* Virtual interface control registers */
uint32_t h_hcr[GIC_NCPU];
uint32_t h_misr[GIC_NCPU];
uint32_t h_lr[GIC_MAX_LR][GIC_NCPU];
uint32_t h_apr[GIC_NCPU];
/* Number of LRs implemented in this GIC instance */
uint32_t num_lrs;
uint32_t num_cpu;
MemoryRegion iomem; /* Distributor */
/* This is just so we can have an opaque pointer which identifies
* both this GIC and which CPU interface we should be accessing.
struct GICState *backref[GIC_NCPU];
MemoryRegion cpuiomem[GIC_NCPU + 1]; /* CPU interfaces */
MemoryRegion vifaceiomem[GIC_NCPU + 1]; /* Virtual interfaces */
MemoryRegion vcpuiomem; /* vCPU interface */
uint32_t num_irq;
uint32_t revision;
bool security_extn;
bool virt_extn;
bool irq_reset_nonsecure; /* configure IRQs as group 1 (NS) on reset? */
int dev_fd; /* kvm device fd if backed by kvm vgic support */
Error *migration_blocker;
} GICState;
#define TYPE_ARM_GIC_COMMON "arm_gic_common"
#define ARM_GIC_COMMON(obj) \
#define ARM_GIC_COMMON_CLASS(klass) \
typedef struct ARMGICCommonClass {
/*< private >*/
SysBusDeviceClass parent_class;
/*< public >*/
void (*pre_save)(GICState *s);
void (*post_load)(GICState *s);
} ARMGICCommonClass;
void gic_init_irqs_and_mmio(GICState *s, qemu_irq_handler handler,
const MemoryRegionOps *ops,
const MemoryRegionOps *virt_ops);