1 /* 2 * QEMU Bochs-style debug console ("port E9") emulation 3 * 4 * Copyright (c) 2003-2004 Fabrice Bellard 5 * Copyright (c) 2008 Citrix Systems, Inc. 6 * Copyright (c) Intel Corporation; author: H. Peter Anvin 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 */ 26 27 #include "qemu/osdep.h" 28 #include "qapi/error.h" 29 #include "hw/hw.h" 30 #include "chardev/char-fe.h" 31 #include "hw/isa/isa.h" 32 #include "hw/i386/pc.h" 33 34 #define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon" 35 #define ISA_DEBUGCON_DEVICE(obj) \ 36 OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE) 37 38 //#define DEBUG_DEBUGCON 39 40 typedef struct DebugconState { 41 MemoryRegion io; 42 CharBackend chr; 43 uint32_t readback; 44 } DebugconState; 45 46 typedef struct ISADebugconState { 47 ISADevice parent_obj; 48 49 uint32_t iobase; 50 DebugconState state; 51 } ISADebugconState; 52 53 static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val, 54 unsigned width) 55 { 56 DebugconState *s = opaque; 57 unsigned char ch = val; 58 59 #ifdef DEBUG_DEBUGCON 60 printf(" [debugcon: write addr=0x%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val); 61 #endif 62 63 /* XXX this blocks entire thread. Rewrite to use 64 * qemu_chr_fe_write and background I/O callbacks */ 65 qemu_chr_fe_write_all(&s->chr, &ch, 1); 66 } 67 68 69 static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width) 70 { 71 DebugconState *s = opaque; 72 73 #ifdef DEBUG_DEBUGCON 74 printf("debugcon: read addr=0x%04" HWADDR_PRIx "\n", addr); 75 #endif 76 77 return s->readback; 78 } 79 80 static const MemoryRegionOps debugcon_ops = { 81 .read = debugcon_ioport_read, 82 .write = debugcon_ioport_write, 83 .valid.min_access_size = 1, 84 .valid.max_access_size = 1, 85 .endianness = DEVICE_LITTLE_ENDIAN, 86 }; 87 88 static void debugcon_realize_core(DebugconState *s, Error **errp) 89 { 90 if (!qemu_chr_fe_backend_connected(&s->chr)) { 91 error_setg(errp, "Can't create debugcon device, empty char device"); 92 return; 93 } 94 95 qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, s, NULL, true); 96 } 97 98 static void debugcon_isa_realizefn(DeviceState *dev, Error **errp) 99 { 100 ISADevice *d = ISA_DEVICE(dev); 101 ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev); 102 DebugconState *s = &isa->state; 103 Error *err = NULL; 104 105 debugcon_realize_core(s, &err); 106 if (err != NULL) { 107 error_propagate(errp, err); 108 return; 109 } 110 memory_region_init_io(&s->io, OBJECT(dev), &debugcon_ops, s, 111 TYPE_ISA_DEBUGCON_DEVICE, 1); 112 memory_region_add_subregion(isa_address_space_io(d), 113 isa->iobase, &s->io); 114 } 115 116 static Property debugcon_isa_properties[] = { 117 DEFINE_PROP_UINT32("iobase", ISADebugconState, iobase, 0xe9), 118 DEFINE_PROP_CHR("chardev", ISADebugconState, state.chr), 119 DEFINE_PROP_UINT32("readback", ISADebugconState, state.readback, 0xe9), 120 DEFINE_PROP_END_OF_LIST(), 121 }; 122 123 static void debugcon_isa_class_initfn(ObjectClass *klass, void *data) 124 { 125 DeviceClass *dc = DEVICE_CLASS(klass); 126 127 dc->realize = debugcon_isa_realizefn; 128 dc->props = debugcon_isa_properties; 129 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 130 } 131 132 static const TypeInfo debugcon_isa_info = { 133 .name = TYPE_ISA_DEBUGCON_DEVICE, 134 .parent = TYPE_ISA_DEVICE, 135 .instance_size = sizeof(ISADebugconState), 136 .class_init = debugcon_isa_class_initfn, 137 }; 138 139 static void debugcon_register_types(void) 140 { 141 type_register_static(&debugcon_isa_info); 142 } 143 144 type_init(debugcon_register_types) 145