1 /* 2 * ARM GIC support 3 * 4 * Copyright (c) 2012 Linaro Limited 5 * Written by Peter Maydell 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation, either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #ifndef HW_ARM_GIC_COMMON_H 22 #define HW_ARM_GIC_COMMON_H 23 24 #include "hw/sysbus.h" 25 #include "qom/object.h" 26 27 /* Maximum number of possible interrupts, determined by the GIC architecture */ 28 #define GIC_MAXIRQ 1020 29 /* First 32 are private to each CPU (SGIs and PPIs). */ 30 #define GIC_INTERNAL 32 31 #define GIC_NR_SGIS 16 32 /* Maximum number of possible CPU interfaces, determined by GIC architecture */ 33 #define GIC_NCPU 8 34 /* Maximum number of possible CPU interfaces with their respective vCPU */ 35 #define GIC_NCPU_VCPU (GIC_NCPU * 2) 36 37 #define MAX_NR_GROUP_PRIO 128 38 #define GIC_NR_APRS (MAX_NR_GROUP_PRIO / 32) 39 40 #define GIC_MIN_BPR 0 41 #define GIC_MIN_ABPR (GIC_MIN_BPR + 1) 42 43 /* Architectural maximum number of list registers in the virtual interface */ 44 #define GIC_MAX_LR 64 45 46 /* Only 32 priority levels and 32 preemption levels in the vCPU interfaces */ 47 #define GIC_VIRT_MAX_GROUP_PRIO_BITS 5 48 #define GIC_VIRT_MAX_NR_GROUP_PRIO (1 << GIC_VIRT_MAX_GROUP_PRIO_BITS) 49 #define GIC_VIRT_NR_APRS (GIC_VIRT_MAX_NR_GROUP_PRIO / 32) 50 51 #define GIC_VIRT_MIN_BPR 2 52 #define GIC_VIRT_MIN_ABPR (GIC_VIRT_MIN_BPR + 1) 53 54 typedef struct gic_irq_state { 55 /* The enable bits are only banked for per-cpu interrupts. */ 56 uint8_t enabled; 57 uint8_t pending; 58 uint8_t active; 59 uint8_t level; 60 bool model; /* 0 = N:N, 1 = 1:N */ 61 bool edge_trigger; /* true: edge-triggered, false: level-triggered */ 62 uint8_t group; 63 } gic_irq_state; 64 65 struct GICState { 66 /*< private >*/ 67 SysBusDevice parent_obj; 68 /*< public >*/ 69 70 qemu_irq parent_irq[GIC_NCPU]; 71 qemu_irq parent_fiq[GIC_NCPU]; 72 qemu_irq parent_virq[GIC_NCPU]; 73 qemu_irq parent_vfiq[GIC_NCPU]; 74 qemu_irq maintenance_irq[GIC_NCPU]; 75 76 /* GICD_CTLR; for a GIC with the security extensions the NS banked version 77 * of this register is just an alias of bit 1 of the S banked version. 78 */ 79 uint32_t ctlr; 80 /* GICC_CTLR; again, the NS banked version is just aliases of bits of 81 * the S banked register, so our state only needs to store the S version. 82 */ 83 uint32_t cpu_ctlr[GIC_NCPU_VCPU]; 84 85 gic_irq_state irq_state[GIC_MAXIRQ]; 86 uint8_t irq_target[GIC_MAXIRQ]; 87 uint8_t priority1[GIC_INTERNAL][GIC_NCPU]; 88 uint8_t priority2[GIC_MAXIRQ - GIC_INTERNAL]; 89 /* For each SGI on the target CPU, we store 8 bits 90 * indicating which source CPUs have made this SGI 91 * pending on the target CPU. These correspond to 92 * the bytes in the GIC_SPENDSGIR* registers as 93 * read by the target CPU. 94 */ 95 uint8_t sgi_pending[GIC_NR_SGIS][GIC_NCPU]; 96 97 uint16_t priority_mask[GIC_NCPU_VCPU]; 98 uint16_t running_priority[GIC_NCPU_VCPU]; 99 uint16_t current_pending[GIC_NCPU_VCPU]; 100 uint32_t n_prio_bits; 101 102 /* If we present the GICv2 without security extensions to a guest, 103 * the guest can configure the GICC_CTLR to configure group 1 binary point 104 * in the abpr. 105 * For a GIC with Security Extensions we use use bpr for the 106 * secure copy and abpr as storage for the non-secure copy of the register. 107 */ 108 uint8_t bpr[GIC_NCPU_VCPU]; 109 uint8_t abpr[GIC_NCPU_VCPU]; 110 111 /* The APR is implementation defined, so we choose a layout identical to 112 * the KVM ABI layout for QEMU's implementation of the gic: 113 * If an interrupt for preemption level X is active, then 114 * APRn[X mod 32] == 0b1, where n = X / 32 115 * otherwise the bit is clear. 116 */ 117 uint32_t apr[GIC_NR_APRS][GIC_NCPU]; 118 uint32_t nsapr[GIC_NR_APRS][GIC_NCPU]; 119 120 /* Virtual interface control registers */ 121 uint32_t h_hcr[GIC_NCPU]; 122 uint32_t h_misr[GIC_NCPU]; 123 uint32_t h_lr[GIC_MAX_LR][GIC_NCPU]; 124 uint32_t h_apr[GIC_NCPU]; 125 126 /* Number of LRs implemented in this GIC instance */ 127 uint32_t num_lrs; 128 129 uint32_t num_cpu; 130 131 MemoryRegion iomem; /* Distributor */ 132 /* This is just so we can have an opaque pointer which identifies 133 * both this GIC and which CPU interface we should be accessing. 134 */ 135 struct GICState *backref[GIC_NCPU]; 136 MemoryRegion cpuiomem[GIC_NCPU + 1]; /* CPU interfaces */ 137 MemoryRegion vifaceiomem[GIC_NCPU + 1]; /* Virtual interfaces */ 138 MemoryRegion vcpuiomem; /* vCPU interface */ 139 140 uint32_t num_irq; 141 uint32_t revision; 142 bool security_extn; 143 bool virt_extn; 144 bool irq_reset_nonsecure; /* configure IRQs as group 1 (NS) on reset? */ 145 int dev_fd; /* kvm device fd if backed by kvm vgic support */ 146 Error *migration_blocker; 147 }; 148 typedef struct GICState GICState; 149 150 #define TYPE_ARM_GIC_COMMON "arm_gic_common" 151 typedef struct ARMGICCommonClass ARMGICCommonClass; 152 DECLARE_OBJ_CHECKERS(GICState, ARMGICCommonClass, 153 ARM_GIC_COMMON, TYPE_ARM_GIC_COMMON) 154 155 struct ARMGICCommonClass { 156 /*< private >*/ 157 SysBusDeviceClass parent_class; 158 /*< public >*/ 159 160 void (*pre_save)(GICState *s); 161 void (*post_load)(GICState *s); 162 }; 163 164 void gic_init_irqs_and_mmio(GICState *s, qemu_irq_handler handler, 165 const MemoryRegionOps *ops, 166 const MemoryRegionOps *virt_ops); 167 168 #endif 169