1 /* 2 * ARM GIC support - common bits of emulated and KVM kernel model 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 #include "gic_internal.h" 22 23 static void gic_pre_save(void *opaque) 24 { 25 GICState *s = (GICState *)opaque; 26 ARMGICCommonClass *c = ARM_GIC_COMMON_GET_CLASS(s); 27 28 if (c->pre_save) { 29 c->pre_save(s); 30 } 31 } 32 33 static int gic_post_load(void *opaque, int version_id) 34 { 35 GICState *s = (GICState *)opaque; 36 ARMGICCommonClass *c = ARM_GIC_COMMON_GET_CLASS(s); 37 38 if (c->post_load) { 39 c->post_load(s); 40 } 41 return 0; 42 } 43 44 static const VMStateDescription vmstate_gic_irq_state = { 45 .name = "arm_gic_irq_state", 46 .version_id = 1, 47 .minimum_version_id = 1, 48 .fields = (VMStateField[]) { 49 VMSTATE_UINT8(enabled, gic_irq_state), 50 VMSTATE_UINT8(pending, gic_irq_state), 51 VMSTATE_UINT8(active, gic_irq_state), 52 VMSTATE_UINT8(level, gic_irq_state), 53 VMSTATE_BOOL(model, gic_irq_state), 54 VMSTATE_BOOL(edge_trigger, gic_irq_state), 55 VMSTATE_UINT8(group, gic_irq_state), 56 VMSTATE_END_OF_LIST() 57 } 58 }; 59 60 static const VMStateDescription vmstate_gic = { 61 .name = "arm_gic", 62 .version_id = 12, 63 .minimum_version_id = 12, 64 .pre_save = gic_pre_save, 65 .post_load = gic_post_load, 66 .fields = (VMStateField[]) { 67 VMSTATE_UINT32(ctlr, GICState), 68 VMSTATE_UINT32_ARRAY(cpu_ctlr, GICState, GIC_NCPU), 69 VMSTATE_STRUCT_ARRAY(irq_state, GICState, GIC_MAXIRQ, 1, 70 vmstate_gic_irq_state, gic_irq_state), 71 VMSTATE_UINT8_ARRAY(irq_target, GICState, GIC_MAXIRQ), 72 VMSTATE_UINT8_2DARRAY(priority1, GICState, GIC_INTERNAL, GIC_NCPU), 73 VMSTATE_UINT8_ARRAY(priority2, GICState, GIC_MAXIRQ - GIC_INTERNAL), 74 VMSTATE_UINT8_2DARRAY(sgi_pending, GICState, GIC_NR_SGIS, GIC_NCPU), 75 VMSTATE_UINT16_ARRAY(priority_mask, GICState, GIC_NCPU), 76 VMSTATE_UINT16_ARRAY(running_priority, GICState, GIC_NCPU), 77 VMSTATE_UINT16_ARRAY(current_pending, GICState, GIC_NCPU), 78 VMSTATE_UINT8_ARRAY(bpr, GICState, GIC_NCPU), 79 VMSTATE_UINT8_ARRAY(abpr, GICState, GIC_NCPU), 80 VMSTATE_UINT32_2DARRAY(apr, GICState, GIC_NR_APRS, GIC_NCPU), 81 VMSTATE_UINT32_2DARRAY(nsapr, GICState, GIC_NR_APRS, GIC_NCPU), 82 VMSTATE_END_OF_LIST() 83 } 84 }; 85 86 void gic_init_irqs_and_mmio(GICState *s, qemu_irq_handler handler, 87 const MemoryRegionOps *ops) 88 { 89 SysBusDevice *sbd = SYS_BUS_DEVICE(s); 90 int i = s->num_irq - GIC_INTERNAL; 91 92 /* For the GIC, also expose incoming GPIO lines for PPIs for each CPU. 93 * GPIO array layout is thus: 94 * [0..N-1] SPIs 95 * [N..N+31] PPIs for CPU 0 96 * [N+32..N+63] PPIs for CPU 1 97 * ... 98 */ 99 if (s->revision != REV_NVIC) { 100 i += (GIC_INTERNAL * s->num_cpu); 101 } 102 qdev_init_gpio_in(DEVICE(s), handler, i); 103 104 for (i = 0; i < s->num_cpu; i++) { 105 sysbus_init_irq(sbd, &s->parent_irq[i]); 106 } 107 for (i = 0; i < s->num_cpu; i++) { 108 sysbus_init_irq(sbd, &s->parent_fiq[i]); 109 } 110 111 /* Distributor */ 112 memory_region_init_io(&s->iomem, OBJECT(s), ops, s, "gic_dist", 0x1000); 113 sysbus_init_mmio(sbd, &s->iomem); 114 115 if (s->revision != REV_NVIC) { 116 /* This is the main CPU interface "for this core". It is always 117 * present because it is required by both software emulation and KVM. 118 * NVIC is not handled here because its CPU interface is different, 119 * neither it can use KVM. 120 */ 121 memory_region_init_io(&s->cpuiomem[0], OBJECT(s), ops ? &ops[1] : NULL, 122 s, "gic_cpu", s->revision == 2 ? 0x1000 : 0x100); 123 sysbus_init_mmio(sbd, &s->cpuiomem[0]); 124 } 125 } 126 127 static void arm_gic_common_realize(DeviceState *dev, Error **errp) 128 { 129 GICState *s = ARM_GIC_COMMON(dev); 130 int num_irq = s->num_irq; 131 132 if (s->num_cpu > GIC_NCPU) { 133 error_setg(errp, "requested %u CPUs exceeds GIC maximum %d", 134 s->num_cpu, GIC_NCPU); 135 return; 136 } 137 s->num_irq += GIC_BASE_IRQ; 138 if (s->num_irq > GIC_MAXIRQ) { 139 error_setg(errp, 140 "requested %u interrupt lines exceeds GIC maximum %d", 141 num_irq, GIC_MAXIRQ); 142 return; 143 } 144 /* ITLinesNumber is represented as (N / 32) - 1 (see 145 * gic_dist_readb) so this is an implementation imposed 146 * restriction, not an architectural one: 147 */ 148 if (s->num_irq < 32 || (s->num_irq % 32)) { 149 error_setg(errp, 150 "%d interrupt lines unsupported: not divisible by 32", 151 num_irq); 152 return; 153 } 154 155 if (s->security_extn && 156 (s->revision == REV_11MPCORE || s->revision == REV_NVIC)) { 157 error_setg(errp, "this GIC revision does not implement " 158 "the security extensions"); 159 return; 160 } 161 } 162 163 static void arm_gic_common_reset(DeviceState *dev) 164 { 165 GICState *s = ARM_GIC_COMMON(dev); 166 int i, j; 167 memset(s->irq_state, 0, GIC_MAXIRQ * sizeof(gic_irq_state)); 168 for (i = 0 ; i < s->num_cpu; i++) { 169 if (s->revision == REV_11MPCORE) { 170 s->priority_mask[i] = 0xf0; 171 } else { 172 s->priority_mask[i] = 0; 173 } 174 s->current_pending[i] = 1023; 175 s->running_priority[i] = 0x100; 176 s->cpu_ctlr[i] = 0; 177 s->bpr[i] = GIC_MIN_BPR; 178 s->abpr[i] = GIC_MIN_ABPR; 179 for (j = 0; j < GIC_INTERNAL; j++) { 180 s->priority1[j][i] = 0; 181 } 182 for (j = 0; j < GIC_NR_SGIS; j++) { 183 s->sgi_pending[j][i] = 0; 184 } 185 } 186 for (i = 0; i < GIC_NR_SGIS; i++) { 187 GIC_SET_ENABLED(i, ALL_CPU_MASK); 188 GIC_SET_EDGE_TRIGGER(i); 189 } 190 191 for (i = 0; i < ARRAY_SIZE(s->priority2); i++) { 192 s->priority2[i] = 0; 193 } 194 195 for (i = 0; i < GIC_MAXIRQ; i++) { 196 /* For uniprocessor GICs all interrupts always target the sole CPU */ 197 if (s->num_cpu == 1) { 198 s->irq_target[i] = 1; 199 } else { 200 s->irq_target[i] = 0; 201 } 202 } 203 s->ctlr = 0; 204 } 205 206 static Property arm_gic_common_properties[] = { 207 DEFINE_PROP_UINT32("num-cpu", GICState, num_cpu, 1), 208 DEFINE_PROP_UINT32("num-irq", GICState, num_irq, 32), 209 /* Revision can be 1 or 2 for GIC architecture specification 210 * versions 1 or 2, or 0 to indicate the legacy 11MPCore GIC. 211 * (Internally, 0xffffffff also indicates "not a GIC but an NVIC".) 212 */ 213 DEFINE_PROP_UINT32("revision", GICState, revision, 1), 214 /* True if the GIC should implement the security extensions */ 215 DEFINE_PROP_BOOL("has-security-extensions", GICState, security_extn, 0), 216 DEFINE_PROP_END_OF_LIST(), 217 }; 218 219 static void arm_gic_common_class_init(ObjectClass *klass, void *data) 220 { 221 DeviceClass *dc = DEVICE_CLASS(klass); 222 223 dc->reset = arm_gic_common_reset; 224 dc->realize = arm_gic_common_realize; 225 dc->props = arm_gic_common_properties; 226 dc->vmsd = &vmstate_gic; 227 } 228 229 static const TypeInfo arm_gic_common_type = { 230 .name = TYPE_ARM_GIC_COMMON, 231 .parent = TYPE_SYS_BUS_DEVICE, 232 .instance_size = sizeof(GICState), 233 .class_size = sizeof(ARMGICCommonClass), 234 .class_init = arm_gic_common_class_init, 235 .abstract = true, 236 }; 237 238 static void register_types(void) 239 { 240 type_register_static(&arm_gic_common_type); 241 } 242 243 type_init(register_types) 244