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 "sysemu/sysemu.h" 18 #include "qemu/log.h" 19 20 #include "hw/nvram/fw_cfg.h" 21 #include "hw/i386/pc.h" 22 #include "qapi-event.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 handle_event(int event) 35 { 36 static bool logged; 37 38 if (event & ~PVPANIC_PANICKED && !logged) { 39 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event); 40 logged = true; 41 } 42 43 if (event & PVPANIC_PANICKED) { 44 qemu_system_guest_panicked(); 45 return; 46 } 47 } 48 49 #include "hw/isa/isa.h" 50 51 typedef struct PVPanicState { 52 ISADevice parent_obj; 53 54 MemoryRegion io; 55 uint16_t ioport; 56 } PVPanicState; 57 58 /* return supported events on read */ 59 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size) 60 { 61 return PVPANIC_PANICKED; 62 } 63 64 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val, 65 unsigned size) 66 { 67 handle_event(val); 68 } 69 70 static const MemoryRegionOps pvpanic_ops = { 71 .read = pvpanic_ioport_read, 72 .write = pvpanic_ioport_write, 73 .impl = { 74 .min_access_size = 1, 75 .max_access_size = 1, 76 }, 77 }; 78 79 static void pvpanic_isa_initfn(Object *obj) 80 { 81 PVPanicState *s = ISA_PVPANIC_DEVICE(obj); 82 83 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1); 84 } 85 86 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp) 87 { 88 ISADevice *d = ISA_DEVICE(dev); 89 PVPanicState *s = ISA_PVPANIC_DEVICE(dev); 90 FWCfgState *fw_cfg = fw_cfg_find(); 91 uint16_t *pvpanic_port; 92 93 if (!fw_cfg) { 94 return; 95 } 96 97 pvpanic_port = g_malloc(sizeof(*pvpanic_port)); 98 *pvpanic_port = cpu_to_le16(s->ioport); 99 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port, 100 sizeof(*pvpanic_port)); 101 102 isa_register_ioport(d, &s->io, s->ioport); 103 } 104 105 #define PVPANIC_IOPORT_PROP "ioport" 106 107 uint16_t pvpanic_port(void) 108 { 109 Object *o = object_resolve_path_type("", TYPE_ISA_PVPANIC_DEVICE, NULL); 110 if (!o) { 111 return 0; 112 } 113 return object_property_get_int(o, PVPANIC_IOPORT_PROP, NULL); 114 } 115 116 static Property pvpanic_isa_properties[] = { 117 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505), 118 DEFINE_PROP_END_OF_LIST(), 119 }; 120 121 static void pvpanic_isa_class_init(ObjectClass *klass, void *data) 122 { 123 DeviceClass *dc = DEVICE_CLASS(klass); 124 125 dc->realize = pvpanic_isa_realizefn; 126 dc->props = pvpanic_isa_properties; 127 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 128 } 129 130 static TypeInfo pvpanic_isa_info = { 131 .name = TYPE_ISA_PVPANIC_DEVICE, 132 .parent = TYPE_ISA_DEVICE, 133 .instance_size = sizeof(PVPanicState), 134 .instance_init = pvpanic_isa_initfn, 135 .class_init = pvpanic_isa_class_init, 136 }; 137 138 static void pvpanic_register_types(void) 139 { 140 type_register_static(&pvpanic_isa_info); 141 } 142 143 type_init(pvpanic_register_types) 144