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 "qemu/osdep.h" 16 #include "qapi/qmp/qobject.h" 17 #include "qapi/qmp/qjson.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 #include "qapi-event.h" 24 25 /* The bit of supported pv event */ 26 #define PVPANIC_F_PANICKED 0 27 28 /* The pv event value */ 29 #define PVPANIC_PANICKED (1 << PVPANIC_F_PANICKED) 30 31 #define TYPE_ISA_PVPANIC_DEVICE "pvpanic" 32 #define ISA_PVPANIC_DEVICE(obj) \ 33 OBJECT_CHECK(PVPanicState, (obj), TYPE_ISA_PVPANIC_DEVICE) 34 35 static void handle_event(int event) 36 { 37 static bool logged; 38 39 if (event & ~PVPANIC_PANICKED && !logged) { 40 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event); 41 logged = true; 42 } 43 44 if (event & PVPANIC_PANICKED) { 45 qemu_system_guest_panicked(NULL); 46 return; 47 } 48 } 49 50 #include "hw/isa/isa.h" 51 52 typedef struct PVPanicState { 53 ISADevice parent_obj; 54 55 MemoryRegion io; 56 uint16_t ioport; 57 } PVPanicState; 58 59 /* return supported events on read */ 60 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size) 61 { 62 return PVPANIC_PANICKED; 63 } 64 65 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val, 66 unsigned size) 67 { 68 handle_event(val); 69 } 70 71 static const MemoryRegionOps pvpanic_ops = { 72 .read = pvpanic_ioport_read, 73 .write = pvpanic_ioport_write, 74 .impl = { 75 .min_access_size = 1, 76 .max_access_size = 1, 77 }, 78 }; 79 80 static void pvpanic_isa_initfn(Object *obj) 81 { 82 PVPanicState *s = ISA_PVPANIC_DEVICE(obj); 83 84 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1); 85 } 86 87 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp) 88 { 89 ISADevice *d = ISA_DEVICE(dev); 90 PVPanicState *s = ISA_PVPANIC_DEVICE(dev); 91 FWCfgState *fw_cfg = fw_cfg_find(); 92 uint16_t *pvpanic_port; 93 94 if (!fw_cfg) { 95 return; 96 } 97 98 pvpanic_port = g_malloc(sizeof(*pvpanic_port)); 99 *pvpanic_port = cpu_to_le16(s->ioport); 100 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port, 101 sizeof(*pvpanic_port)); 102 103 isa_register_ioport(d, &s->io, s->ioport); 104 } 105 106 #define PVPANIC_IOPORT_PROP "ioport" 107 108 uint16_t pvpanic_port(void) 109 { 110 Object *o = object_resolve_path_type("", TYPE_ISA_PVPANIC_DEVICE, NULL); 111 if (!o) { 112 return 0; 113 } 114 return object_property_get_uint(o, PVPANIC_IOPORT_PROP, NULL); 115 } 116 117 static Property pvpanic_isa_properties[] = { 118 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505), 119 DEFINE_PROP_END_OF_LIST(), 120 }; 121 122 static void pvpanic_isa_class_init(ObjectClass *klass, void *data) 123 { 124 DeviceClass *dc = DEVICE_CLASS(klass); 125 126 dc->realize = pvpanic_isa_realizefn; 127 dc->props = pvpanic_isa_properties; 128 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 129 } 130 131 static TypeInfo pvpanic_isa_info = { 132 .name = TYPE_ISA_PVPANIC_DEVICE, 133 .parent = TYPE_ISA_DEVICE, 134 .instance_size = sizeof(PVPanicState), 135 .instance_init = pvpanic_isa_initfn, 136 .class_init = pvpanic_isa_class_init, 137 }; 138 139 static void pvpanic_register_types(void) 140 { 141 type_register_static(&pvpanic_isa_info); 142 } 143 144 type_init(pvpanic_register_types) 145