1 /* 2 * QEMU simulated pvpanic device. 3 * 4 * Copyright Fujitsu, Corp. 2013 5 * 6 * Authors: 7 * Wen Congyang <wency@cn.fujitsu.com> 8 * Hu Tao <hutao@cn.fujitsu.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2 or later. 11 * See the COPYING file in the top-level directory. 12 * 13 */ 14 15 #include "qapi/qmp/qobject.h" 16 #include "qapi/qmp/qjson.h" 17 #include "monitor/monitor.h" 18 #include "sysemu/sysemu.h" 19 #include "qemu/log.h" 20 21 #include "hw/nvram/fw_cfg.h" 22 #include "hw/i386/pc.h" 23 24 /* The bit of supported pv event */ 25 #define PVPANIC_F_PANICKED 0 26 27 /* The pv event value */ 28 #define PVPANIC_PANICKED (1 << PVPANIC_F_PANICKED) 29 30 #define TYPE_ISA_PVPANIC_DEVICE "pvpanic" 31 #define ISA_PVPANIC_DEVICE(obj) \ 32 OBJECT_CHECK(PVPanicState, (obj), TYPE_ISA_PVPANIC_DEVICE) 33 34 static void panicked_mon_event(const char *action) 35 { 36 QObject *data; 37 38 data = qobject_from_jsonf("{ 'action': %s }", action); 39 monitor_protocol_event(QEVENT_GUEST_PANICKED, data); 40 qobject_decref(data); 41 } 42 43 static void handle_event(int event) 44 { 45 static bool logged; 46 47 if (event & ~PVPANIC_PANICKED && !logged) { 48 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event); 49 logged = true; 50 } 51 52 if (event & PVPANIC_PANICKED) { 53 panicked_mon_event("pause"); 54 vm_stop(RUN_STATE_GUEST_PANICKED); 55 return; 56 } 57 } 58 59 #include "hw/isa/isa.h" 60 61 typedef struct PVPanicState { 62 ISADevice parent_obj; 63 64 MemoryRegion io; 65 uint16_t ioport; 66 } PVPanicState; 67 68 /* return supported events on read */ 69 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size) 70 { 71 return PVPANIC_PANICKED; 72 } 73 74 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val, 75 unsigned size) 76 { 77 handle_event(val); 78 } 79 80 static const MemoryRegionOps pvpanic_ops = { 81 .read = pvpanic_ioport_read, 82 .write = pvpanic_ioport_write, 83 .impl = { 84 .min_access_size = 1, 85 .max_access_size = 1, 86 }, 87 }; 88 89 static void pvpanic_isa_initfn(Object *obj) 90 { 91 PVPanicState *s = ISA_PVPANIC_DEVICE(obj); 92 93 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1); 94 } 95 96 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp) 97 { 98 ISADevice *d = ISA_DEVICE(dev); 99 PVPanicState *s = ISA_PVPANIC_DEVICE(dev); 100 FWCfgState *fw_cfg = fw_cfg_find(); 101 uint16_t *pvpanic_port; 102 103 if (!fw_cfg) { 104 return; 105 } 106 107 pvpanic_port = g_malloc(sizeof(*pvpanic_port)); 108 *pvpanic_port = cpu_to_le16(s->ioport); 109 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port, 110 sizeof(*pvpanic_port)); 111 112 isa_register_ioport(d, &s->io, s->ioport); 113 } 114 115 #define PVPANIC_IOPORT_PROP "ioport" 116 117 uint16_t pvpanic_port(void) 118 { 119 Object *o = object_resolve_path_type("", TYPE_ISA_PVPANIC_DEVICE, NULL); 120 if (!o) { 121 return 0; 122 } 123 return object_property_get_int(o, PVPANIC_IOPORT_PROP, NULL); 124 } 125 126 static Property pvpanic_isa_properties[] = { 127 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505), 128 DEFINE_PROP_END_OF_LIST(), 129 }; 130 131 static void pvpanic_isa_class_init(ObjectClass *klass, void *data) 132 { 133 DeviceClass *dc = DEVICE_CLASS(klass); 134 135 dc->realize = pvpanic_isa_realizefn; 136 dc->props = pvpanic_isa_properties; 137 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 138 } 139 140 static TypeInfo pvpanic_isa_info = { 141 .name = TYPE_ISA_PVPANIC_DEVICE, 142 .parent = TYPE_ISA_DEVICE, 143 .instance_size = sizeof(PVPanicState), 144 .instance_init = pvpanic_isa_initfn, 145 .class_init = pvpanic_isa_class_init, 146 }; 147 148 static void pvpanic_register_types(void) 149 { 150 type_register_static(&pvpanic_isa_info); 151 } 152 153 type_init(pvpanic_register_types) 154