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 "sysemu/sysemu.h" 17 #include "qemu/log.h" 18 19 #include "hw/nvram/fw_cfg.h" 20 #include "hw/misc/pvpanic.h" 21 22 /* The bit of supported pv event */ 23 #define PVPANIC_F_PANICKED 0 24 25 /* The pv event value */ 26 #define PVPANIC_PANICKED (1 << PVPANIC_F_PANICKED) 27 28 #define ISA_PVPANIC_DEVICE(obj) \ 29 OBJECT_CHECK(PVPanicState, (obj), TYPE_PVPANIC) 30 31 static void handle_event(int event) 32 { 33 static bool logged; 34 35 if (event & ~PVPANIC_PANICKED && !logged) { 36 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event); 37 logged = true; 38 } 39 40 if (event & PVPANIC_PANICKED) { 41 qemu_system_guest_panicked(NULL); 42 return; 43 } 44 } 45 46 #include "hw/isa/isa.h" 47 48 typedef struct PVPanicState { 49 ISADevice parent_obj; 50 51 MemoryRegion io; 52 uint16_t ioport; 53 } PVPanicState; 54 55 /* return supported events on read */ 56 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size) 57 { 58 return PVPANIC_PANICKED; 59 } 60 61 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val, 62 unsigned size) 63 { 64 handle_event(val); 65 } 66 67 static const MemoryRegionOps pvpanic_ops = { 68 .read = pvpanic_ioport_read, 69 .write = pvpanic_ioport_write, 70 .impl = { 71 .min_access_size = 1, 72 .max_access_size = 1, 73 }, 74 }; 75 76 static void pvpanic_isa_initfn(Object *obj) 77 { 78 PVPanicState *s = ISA_PVPANIC_DEVICE(obj); 79 80 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1); 81 } 82 83 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp) 84 { 85 ISADevice *d = ISA_DEVICE(dev); 86 PVPanicState *s = ISA_PVPANIC_DEVICE(dev); 87 FWCfgState *fw_cfg = fw_cfg_find(); 88 uint16_t *pvpanic_port; 89 90 if (!fw_cfg) { 91 return; 92 } 93 94 pvpanic_port = g_malloc(sizeof(*pvpanic_port)); 95 *pvpanic_port = cpu_to_le16(s->ioport); 96 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port, 97 sizeof(*pvpanic_port)); 98 99 isa_register_ioport(d, &s->io, s->ioport); 100 } 101 102 #define PVPANIC_IOPORT_PROP "ioport" 103 104 uint16_t pvpanic_port(void) 105 { 106 Object *o = object_resolve_path_type("", TYPE_PVPANIC, NULL); 107 if (!o) { 108 return 0; 109 } 110 return object_property_get_uint(o, PVPANIC_IOPORT_PROP, NULL); 111 } 112 113 static Property pvpanic_isa_properties[] = { 114 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505), 115 DEFINE_PROP_END_OF_LIST(), 116 }; 117 118 static void pvpanic_isa_class_init(ObjectClass *klass, void *data) 119 { 120 DeviceClass *dc = DEVICE_CLASS(klass); 121 122 dc->realize = pvpanic_isa_realizefn; 123 dc->props = pvpanic_isa_properties; 124 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 125 } 126 127 static TypeInfo pvpanic_isa_info = { 128 .name = TYPE_PVPANIC, 129 .parent = TYPE_ISA_DEVICE, 130 .instance_size = sizeof(PVPanicState), 131 .instance_init = pvpanic_isa_initfn, 132 .class_init = pvpanic_isa_class_init, 133 }; 134 135 static void pvpanic_register_types(void) 136 { 137 type_register_static(&pvpanic_isa_info); 138 } 139 140 type_init(pvpanic_register_types) 141