1 /* 2 * SPDX-License-Identifier: GPL-2.0-or-later 3 * 4 * Virt system Controller 5 */ 6 7 #include "qemu/osdep.h" 8 #include "hw/qdev-properties.h" 9 #include "hw/sysbus.h" 10 #include "migration/vmstate.h" 11 #include "qemu/log.h" 12 #include "trace.h" 13 #include "sysemu/runstate.h" 14 #include "hw/misc/virt_ctrl.h" 15 16 enum { 17 REG_FEATURES = 0x00, 18 REG_CMD = 0x04, 19 }; 20 21 #define FEAT_POWER_CTRL 0x00000001 22 23 enum { 24 CMD_NOOP, 25 CMD_RESET, 26 CMD_HALT, 27 CMD_PANIC, 28 }; 29 30 static uint64_t virt_ctrl_read(void *opaque, hwaddr addr, unsigned size) 31 { 32 VirtCtrlState *s = opaque; 33 uint64_t value = 0; 34 35 switch (addr) { 36 case REG_FEATURES: 37 value = FEAT_POWER_CTRL; 38 break; 39 default: 40 qemu_log_mask(LOG_UNIMP, 41 "%s: unimplemented register read 0x%02"HWADDR_PRIx"\n", 42 __func__, addr); 43 break; 44 } 45 46 trace_virt_ctrl_write(s, addr, size, value); 47 48 return value; 49 } 50 51 static void virt_ctrl_write(void *opaque, hwaddr addr, uint64_t value, 52 unsigned size) 53 { 54 VirtCtrlState *s = opaque; 55 56 trace_virt_ctrl_write(s, addr, size, value); 57 58 switch (addr) { 59 case REG_CMD: 60 switch (value) { 61 case CMD_NOOP: 62 break; 63 case CMD_RESET: 64 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 65 break; 66 case CMD_HALT: 67 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 68 break; 69 case CMD_PANIC: 70 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_PANIC); 71 break; 72 } 73 break; 74 default: 75 qemu_log_mask(LOG_UNIMP, 76 "%s: unimplemented register write 0x%02"HWADDR_PRIx"\n", 77 __func__, addr); 78 break; 79 } 80 } 81 82 static const MemoryRegionOps virt_ctrl_ops = { 83 .read = virt_ctrl_read, 84 .write = virt_ctrl_write, 85 .endianness = DEVICE_NATIVE_ENDIAN, 86 .valid.max_access_size = 4, 87 .impl.max_access_size = 4, 88 }; 89 90 static void virt_ctrl_reset(DeviceState *dev) 91 { 92 VirtCtrlState *s = VIRT_CTRL(dev); 93 94 trace_virt_ctrl_reset(s); 95 } 96 97 static void virt_ctrl_realize(DeviceState *dev, Error **errp) 98 { 99 VirtCtrlState *s = VIRT_CTRL(dev); 100 101 trace_virt_ctrl_instance_init(s); 102 103 memory_region_init_io(&s->iomem, OBJECT(s), &virt_ctrl_ops, s, 104 "virt-ctrl", 0x100); 105 } 106 107 static const VMStateDescription vmstate_virt_ctrl = { 108 .name = "virt-ctrl", 109 .version_id = 1, 110 .minimum_version_id = 1, 111 .fields = (const VMStateField[]) { 112 VMSTATE_UINT32(irq_enabled, VirtCtrlState), 113 VMSTATE_END_OF_LIST() 114 } 115 }; 116 117 static void virt_ctrl_instance_init(Object *obj) 118 { 119 SysBusDevice *dev = SYS_BUS_DEVICE(obj); 120 VirtCtrlState *s = VIRT_CTRL(obj); 121 122 trace_virt_ctrl_instance_init(s); 123 124 sysbus_init_mmio(dev, &s->iomem); 125 sysbus_init_irq(dev, &s->irq); 126 } 127 128 static void virt_ctrl_class_init(ObjectClass *oc, void *data) 129 { 130 DeviceClass *dc = DEVICE_CLASS(oc); 131 132 device_class_set_legacy_reset(dc, virt_ctrl_reset); 133 dc->realize = virt_ctrl_realize; 134 dc->vmsd = &vmstate_virt_ctrl; 135 } 136 137 static const TypeInfo virt_ctrl_info = { 138 .name = TYPE_VIRT_CTRL, 139 .parent = TYPE_SYS_BUS_DEVICE, 140 .class_init = virt_ctrl_class_init, 141 .instance_init = virt_ctrl_instance_init, 142 .instance_size = sizeof(VirtCtrlState), 143 }; 144 145 static void virt_ctrl_register_types(void) 146 { 147 type_register_static(&virt_ctrl_info); 148 } 149 150 type_init(virt_ctrl_register_types) 151