hw/i386/vmport.c

   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 "hw/input/i8042.h"
  29 #include "sysemu/hw_accel.h"
  30 #include "hw/qdev.h"
  31 #include "qemu/log.h"
  32 #include "trace.h"
  33
  34 #define VMPORT_CMD_GETVERSION 0x0a
  35 #define VMPORT_CMD_GETRAMSIZE 0x14
  36
  37 #define VMPORT_ENTRIES 0x2c
  38 #define VMPORT_MAGIC   0x564D5868
  39
  40 #define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT)
  41
  42 typedef struct VMPortState {
  43     ISADevice parent_obj;
  44
  45     MemoryRegion io;
  46     VMPortReadFunc *func[VMPORT_ENTRIES];
  47     void *opaque[VMPORT_ENTRIES];
  48 } VMPortState;
  49
  50 static VMPortState *port_state;
  51
  52 void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
  53 {
  54     if (command >= VMPORT_ENTRIES) {
  55         return;
  56     }
  57
  58     trace_vmport_register(command, func, opaque);
  59     port_state->func[command] = func;
  60     port_state->opaque[command] = opaque;
  61 }
  62
  63 static uint64_t vmport_ioport_read(void *opaque, hwaddr addr,
  64                                    unsigned size)
  65 {
  66     VMPortState *s = opaque;
  67     CPUState *cs = current_cpu;
  68     X86CPU *cpu = X86_CPU(cs);
  69     CPUX86State *env = &cpu->env;
  70     unsigned char command;
  71     uint32_t eax;
  72
  73     cpu_synchronize_state(cs);
  74
  75     eax = env->regs[R_EAX];
  76     if (eax != VMPORT_MAGIC) {
  77         return eax;
  78     }
  79
  80     command = env->regs[R_ECX];
  81     trace_vmport_command(command);
  82     if (command >= VMPORT_ENTRIES || !s->func[command]) {
  83         qemu_log_mask(LOG_UNIMP, "vmport: unknown command %x\n", command);
  84         return eax;
  85     }
  86
  87     return s->func[command](s->opaque[command], addr);
  88 }
  89
  90 static void vmport_ioport_write(void *opaque, hwaddr addr,
  91                                 uint64_t val, unsigned size)
  92 {
  93     X86CPU *cpu = X86_CPU(current_cpu);
  94
  95     cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
  96 }
  97
  98 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  99 {
 100     X86CPU *cpu = X86_CPU(current_cpu);
 101
 102     cpu->env.regs[R_EBX] = VMPORT_MAGIC;
 103     return 6;
 104 }
 105
 106 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 107 {
 108     X86CPU *cpu = X86_CPU(current_cpu);
 109
 110     cpu->env.regs[R_EBX] = 0x1177;
 111     return ram_size;
 112 }
 113
 114 /* vmmouse helpers */
 115 void vmmouse_get_data(uint32_t *data)
 116 {
 117     X86CPU *cpu = X86_CPU(current_cpu);
 118     CPUX86State *env = &cpu->env;
 119
 120     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 121     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 122     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 123 }
 124
 125 void vmmouse_set_data(const uint32_t *data)
 126 {
 127     X86CPU *cpu = X86_CPU(current_cpu);
 128     CPUX86State *env = &cpu->env;
 129
 130     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 131     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 132     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 133 }
 134
 135 static const MemoryRegionOps vmport_ops = {
 136     .read = vmport_ioport_read,
 137     .write = vmport_ioport_write,
 138     .impl = {
 139         .min_access_size = 4,
 140         .max_access_size = 4,
 141     },
 142     .endianness = DEVICE_LITTLE_ENDIAN,
 143 };
 144
 145 static void vmport_realizefn(DeviceState *dev, Error **errp)
 146 {
 147     ISADevice *isadev = ISA_DEVICE(dev);
 148     VMPortState *s = VMPORT(dev);
 149
 150     memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
 151     isa_register_ioport(isadev, &s->io, 0x5658);
 152
 153     port_state = s;
 154     /* Register some generic port commands */
 155     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 156     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 157 }
 158
 159 static void vmport_class_initfn(ObjectClass *klass, void *data)
 160 {
 161     DeviceClass *dc = DEVICE_CLASS(klass);
 162
 163     dc->realize = vmport_realizefn;
 164     /* Reason: realize sets global port_state */
 165     dc->user_creatable = false;
 166 }
 167
 168 static const TypeInfo vmport_info = {
 169     .name          = TYPE_VMPORT,
 170     .parent        = TYPE_ISA_DEVICE,
 171     .instance_size = sizeof(VMPortState),
 172     .class_init    = vmport_class_initfn,
 173 };
 174
 175 static void vmport_register_types(void)
 176 {
 177     type_register_static(&vmport_info);
 178 }
 179
 180 type_init(vmport_register_types)