1 /* 2 * QEMU VMPort emulation 3 * 4 * Copyright (C) 2007 Hervé Poussineau 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #include "qemu/osdep.h" 25 #include "hw/hw.h" 26 #include "hw/isa/isa.h" 27 #include "hw/i386/pc.h" 28 #include "sysemu/hw_accel.h" 29 #include "hw/qdev.h" 30 #include "qemu/log.h" 31 #include "trace.h" 32 33 #define VMPORT_CMD_GETVERSION 0x0a 34 #define VMPORT_CMD_GETRAMSIZE 0x14 35 36 #define VMPORT_ENTRIES 0x2c 37 #define VMPORT_MAGIC 0x564D5868 38 39 #define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT) 40 41 typedef struct VMPortState { 42 ISADevice parent_obj; 43 44 MemoryRegion io; 45 VMPortReadFunc *func[VMPORT_ENTRIES]; 46 void *opaque[VMPORT_ENTRIES]; 47 } VMPortState; 48 49 static VMPortState *port_state; 50 51 void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque) 52 { 53 if (command >= VMPORT_ENTRIES) { 54 return; 55 } 56 57 trace_vmport_register(command, func, opaque); 58 port_state->func[command] = func; 59 port_state->opaque[command] = opaque; 60 } 61 62 static uint64_t vmport_ioport_read(void *opaque, hwaddr addr, 63 unsigned size) 64 { 65 VMPortState *s = opaque; 66 CPUState *cs = current_cpu; 67 X86CPU *cpu = X86_CPU(cs); 68 CPUX86State *env = &cpu->env; 69 unsigned char command; 70 uint32_t eax; 71 72 cpu_synchronize_state(cs); 73 74 eax = env->regs[R_EAX]; 75 if (eax != VMPORT_MAGIC) { 76 return eax; 77 } 78 79 command = env->regs[R_ECX]; 80 trace_vmport_command(command); 81 if (command >= VMPORT_ENTRIES || !s->func[command]) { 82 qemu_log_mask(LOG_UNIMP, "vmport: unknown command %x\n", command); 83 return eax; 84 } 85 86 return s->func[command](s->opaque[command], addr); 87 } 88 89 static void vmport_ioport_write(void *opaque, hwaddr addr, 90 uint64_t val, unsigned size) 91 { 92 X86CPU *cpu = X86_CPU(current_cpu); 93 94 cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4); 95 } 96 97 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr) 98 { 99 X86CPU *cpu = X86_CPU(current_cpu); 100 101 cpu->env.regs[R_EBX] = VMPORT_MAGIC; 102 return 6; 103 } 104 105 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr) 106 { 107 X86CPU *cpu = X86_CPU(current_cpu); 108 109 cpu->env.regs[R_EBX] = 0x1177; 110 return ram_size; 111 } 112 113 /* vmmouse helpers */ 114 void vmmouse_get_data(uint32_t *data) 115 { 116 X86CPU *cpu = X86_CPU(current_cpu); 117 CPUX86State *env = &cpu->env; 118 119 data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX]; 120 data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX]; 121 data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI]; 122 } 123 124 void vmmouse_set_data(const uint32_t *data) 125 { 126 X86CPU *cpu = X86_CPU(current_cpu); 127 CPUX86State *env = &cpu->env; 128 129 env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1]; 130 env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3]; 131 env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5]; 132 } 133 134 static const MemoryRegionOps vmport_ops = { 135 .read = vmport_ioport_read, 136 .write = vmport_ioport_write, 137 .impl = { 138 .min_access_size = 4, 139 .max_access_size = 4, 140 }, 141 .endianness = DEVICE_LITTLE_ENDIAN, 142 }; 143 144 static void vmport_realizefn(DeviceState *dev, Error **errp) 145 { 146 ISADevice *isadev = ISA_DEVICE(dev); 147 VMPortState *s = VMPORT(dev); 148 149 memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1); 150 isa_register_ioport(isadev, &s->io, 0x5658); 151 152 port_state = s; 153 /* Register some generic port commands */ 154 vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL); 155 vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL); 156 } 157 158 static void vmport_class_initfn(ObjectClass *klass, void *data) 159 { 160 DeviceClass *dc = DEVICE_CLASS(klass); 161 162 dc->realize = vmport_realizefn; 163 /* Reason: realize sets global port_state */ 164 dc->user_creatable = false; 165 } 166 167 static const TypeInfo vmport_info = { 168 .name = TYPE_VMPORT, 169 .parent = TYPE_ISA_DEVICE, 170 .instance_size = sizeof(VMPortState), 171 .class_init = vmport_class_initfn, 172 }; 173 174 static void vmport_register_types(void) 175 { 176 type_register_static(&vmport_info); 177 } 178 179 type_init(vmport_register_types) 180