169 lines
5.8 KiB
C
169 lines
5.8 KiB
C
/*
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* ARM GIC support
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*
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* Copyright (c) 2012 Linaro Limited
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* Written by Peter Maydell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef HW_ARM_GIC_COMMON_H
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#define HW_ARM_GIC_COMMON_H
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#include "hw/sysbus.h"
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/* Maximum number of possible interrupts, determined by the GIC architecture */
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#define GIC_MAXIRQ 1020
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/* First 32 are private to each CPU (SGIs and PPIs). */
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#define GIC_INTERNAL 32
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#define GIC_NR_SGIS 16
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/* Maximum number of possible CPU interfaces, determined by GIC architecture */
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#define GIC_NCPU 8
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/* Maximum number of possible CPU interfaces with their respective vCPU */
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#define GIC_NCPU_VCPU (GIC_NCPU * 2)
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#define MAX_NR_GROUP_PRIO 128
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#define GIC_NR_APRS (MAX_NR_GROUP_PRIO / 32)
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#define GIC_MIN_BPR 0
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#define GIC_MIN_ABPR (GIC_MIN_BPR + 1)
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/* Architectural maximum number of list registers in the virtual interface */
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#define GIC_MAX_LR 64
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/* Only 32 priority levels and 32 preemption levels in the vCPU interfaces */
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#define GIC_VIRT_MAX_GROUP_PRIO_BITS 5
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#define GIC_VIRT_MAX_NR_GROUP_PRIO (1 << GIC_VIRT_MAX_GROUP_PRIO_BITS)
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#define GIC_VIRT_NR_APRS (GIC_VIRT_MAX_NR_GROUP_PRIO / 32)
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#define GIC_VIRT_MIN_BPR 2
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#define GIC_VIRT_MIN_ABPR (GIC_VIRT_MIN_BPR + 1)
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typedef struct gic_irq_state {
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/* The enable bits are only banked for per-cpu interrupts. */
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uint8_t enabled;
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uint8_t pending;
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uint8_t active;
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uint8_t level;
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bool model; /* 0 = N:N, 1 = 1:N */
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bool edge_trigger; /* true: edge-triggered, false: level-triggered */
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uint8_t group;
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} gic_irq_state;
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typedef struct GICState {
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/*< private >*/
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SysBusDevice parent_obj;
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/*< public >*/
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qemu_irq parent_irq[GIC_NCPU];
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qemu_irq parent_fiq[GIC_NCPU];
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qemu_irq parent_virq[GIC_NCPU];
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qemu_irq parent_vfiq[GIC_NCPU];
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qemu_irq maintenance_irq[GIC_NCPU];
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/* GICD_CTLR; for a GIC with the security extensions the NS banked version
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* of this register is just an alias of bit 1 of the S banked version.
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*/
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uint32_t ctlr;
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/* GICC_CTLR; again, the NS banked version is just aliases of bits of
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* the S banked register, so our state only needs to store the S version.
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*/
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uint32_t cpu_ctlr[GIC_NCPU_VCPU];
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gic_irq_state irq_state[GIC_MAXIRQ];
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uint8_t irq_target[GIC_MAXIRQ];
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uint8_t priority1[GIC_INTERNAL][GIC_NCPU];
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uint8_t priority2[GIC_MAXIRQ - GIC_INTERNAL];
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/* For each SGI on the target CPU, we store 8 bits
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* indicating which source CPUs have made this SGI
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* pending on the target CPU. These correspond to
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* the bytes in the GIC_SPENDSGIR* registers as
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* read by the target CPU.
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*/
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uint8_t sgi_pending[GIC_NR_SGIS][GIC_NCPU];
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uint16_t priority_mask[GIC_NCPU_VCPU];
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uint16_t running_priority[GIC_NCPU_VCPU];
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uint16_t current_pending[GIC_NCPU_VCPU];
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uint32_t n_prio_bits;
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/* If we present the GICv2 without security extensions to a guest,
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* the guest can configure the GICC_CTLR to configure group 1 binary point
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* in the abpr.
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* For a GIC with Security Extensions we use use bpr for the
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* secure copy and abpr as storage for the non-secure copy of the register.
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*/
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uint8_t bpr[GIC_NCPU_VCPU];
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uint8_t abpr[GIC_NCPU_VCPU];
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/* The APR is implementation defined, so we choose a layout identical to
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* the KVM ABI layout for QEMU's implementation of the gic:
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* If an interrupt for preemption level X is active, then
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* APRn[X mod 32] == 0b1, where n = X / 32
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* otherwise the bit is clear.
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*/
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uint32_t apr[GIC_NR_APRS][GIC_NCPU];
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uint32_t nsapr[GIC_NR_APRS][GIC_NCPU];
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/* Virtual interface control registers */
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uint32_t h_hcr[GIC_NCPU];
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uint32_t h_misr[GIC_NCPU];
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uint32_t h_lr[GIC_MAX_LR][GIC_NCPU];
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uint32_t h_apr[GIC_NCPU];
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/* Number of LRs implemented in this GIC instance */
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uint32_t num_lrs;
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uint32_t num_cpu;
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MemoryRegion iomem; /* Distributor */
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/* This is just so we can have an opaque pointer which identifies
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* both this GIC and which CPU interface we should be accessing.
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*/
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struct GICState *backref[GIC_NCPU];
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MemoryRegion cpuiomem[GIC_NCPU + 1]; /* CPU interfaces */
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MemoryRegion vifaceiomem[GIC_NCPU + 1]; /* Virtual interfaces */
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MemoryRegion vcpuiomem; /* vCPU interface */
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uint32_t num_irq;
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uint32_t revision;
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bool security_extn;
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bool virt_extn;
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bool irq_reset_nonsecure; /* configure IRQs as group 1 (NS) on reset? */
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int dev_fd; /* kvm device fd if backed by kvm vgic support */
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Error *migration_blocker;
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} GICState;
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#define TYPE_ARM_GIC_COMMON "arm_gic_common"
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#define ARM_GIC_COMMON(obj) \
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OBJECT_CHECK(GICState, (obj), TYPE_ARM_GIC_COMMON)
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#define ARM_GIC_COMMON_CLASS(klass) \
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OBJECT_CLASS_CHECK(ARMGICCommonClass, (klass), TYPE_ARM_GIC_COMMON)
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#define ARM_GIC_COMMON_GET_CLASS(obj) \
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OBJECT_GET_CLASS(ARMGICCommonClass, (obj), TYPE_ARM_GIC_COMMON)
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typedef struct ARMGICCommonClass {
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/*< private >*/
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SysBusDeviceClass parent_class;
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/*< public >*/
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void (*pre_save)(GICState *s);
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void (*post_load)(GICState *s);
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} ARMGICCommonClass;
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void gic_init_irqs_and_mmio(GICState *s, qemu_irq_handler handler,
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const MemoryRegionOps *ops,
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const MemoryRegionOps *virt_ops);
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#endif
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