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