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 "hw.h" 28 #include "char/char.h" 29 #include "isa.h" 30 #include "pc.h" 31 32 //#define DEBUG_DEBUGCON 33 34 typedef struct DebugconState { 35 CharDriverState *chr; 36 uint32_t readback; 37 } DebugconState; 38 39 typedef struct ISADebugconState { 40 ISADevice dev; 41 uint32_t iobase; 42 DebugconState state; 43 } ISADebugconState; 44 45 static void debugcon_ioport_write(void *opaque, uint32_t addr, uint32_t val) 46 { 47 DebugconState *s = opaque; 48 unsigned char ch = val; 49 50 #ifdef DEBUG_DEBUGCON 51 printf("debugcon: write addr=0x%04x val=0x%02x\n", addr, val); 52 #endif 53 54 qemu_chr_fe_write(s->chr, &ch, 1); 55 } 56 57 58 static uint32_t debugcon_ioport_read(void *opaque, uint32_t addr) 59 { 60 DebugconState *s = opaque; 61 62 #ifdef DEBUG_DEBUGCON 63 printf("debugcon: read addr=0x%04x\n", addr); 64 #endif 65 66 return s->readback; 67 } 68 69 static void debugcon_init_core(DebugconState *s) 70 { 71 if (!s->chr) { 72 fprintf(stderr, "Can't create debugcon device, empty char device\n"); 73 exit(1); 74 } 75 76 qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s); 77 } 78 79 static int debugcon_isa_initfn(ISADevice *dev) 80 { 81 ISADebugconState *isa = DO_UPCAST(ISADebugconState, dev, dev); 82 DebugconState *s = &isa->state; 83 84 debugcon_init_core(s); 85 register_ioport_write(isa->iobase, 1, 1, debugcon_ioport_write, s); 86 register_ioport_read(isa->iobase, 1, 1, debugcon_ioport_read, s); 87 return 0; 88 } 89 90 static Property debugcon_isa_properties[] = { 91 DEFINE_PROP_HEX32("iobase", ISADebugconState, iobase, 0xe9), 92 DEFINE_PROP_CHR("chardev", ISADebugconState, state.chr), 93 DEFINE_PROP_HEX32("readback", ISADebugconState, state.readback, 0xe9), 94 DEFINE_PROP_END_OF_LIST(), 95 }; 96 97 static void debugcon_isa_class_initfn(ObjectClass *klass, void *data) 98 { 99 DeviceClass *dc = DEVICE_CLASS(klass); 100 ISADeviceClass *ic = ISA_DEVICE_CLASS(klass); 101 ic->init = debugcon_isa_initfn; 102 dc->props = debugcon_isa_properties; 103 } 104 105 static TypeInfo debugcon_isa_info = { 106 .name = "isa-debugcon", 107 .parent = TYPE_ISA_DEVICE, 108 .instance_size = sizeof(ISADebugconState), 109 .class_init = debugcon_isa_class_initfn, 110 }; 111 112 static void debugcon_register_types(void) 113 { 114 type_register_static(&debugcon_isa_info); 115 } 116 117 type_init(debugcon_register_types) 118