LXR qemu/hw/misc/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 "sysemu/kvm.h"
  29#include "hw/qdev.h"
  30
  31//#define VMPORT_DEBUG
  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
  41typedef struct VMPortState
  42{
  43    ISADevice parent_obj;
  44
  45    MemoryRegion io;
  46    VMPortReadFunc *func[VMPORT_ENTRIES];
  47    void *opaque[VMPORT_ENTRIES];
  48} VMPortState;
  49
  50static VMPortState *port_state;
  51
  52void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
  53{
  54    if (command >= VMPORT_ENTRIES)
  55        return;
  56
  57    port_state->func[command] = func;
  58    port_state->opaque[command] = opaque;
  59}
  60
  61static uint64_t vmport_ioport_read(void *opaque, hwaddr addr,
  62                                   unsigned size)
  63{
  64    VMPortState *s = opaque;
  65    CPUState *cs = current_cpu;
  66    X86CPU *cpu = X86_CPU(cs);
  67    CPUX86State *env = &cpu->env;
  68    unsigned char command;
  69    uint32_t eax;
  70
  71    cpu_synchronize_state(cs);
  72
  73    eax = env->regs[R_EAX];
  74    if (eax != VMPORT_MAGIC)
  75        return eax;
  76
  77    command = env->regs[R_ECX];
  78    if (command >= VMPORT_ENTRIES)
  79        return eax;
  80    if (!s->func[command])
  81    {
  82#ifdef VMPORT_DEBUG
  83        fprintf(stderr, "vmport: unknown command %x\n", command);
  84#endif
  85        return eax;
  86    }
  87
  88    return s->func[command](s->opaque[command], addr);
  89}
  90
  91static void vmport_ioport_write(void *opaque, hwaddr addr,
  92                                uint64_t val, unsigned size)
  93{
  94    X86CPU *cpu = X86_CPU(current_cpu);
  95
  96    cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
  97}
  98
  99static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
 100{
 101    X86CPU *cpu = X86_CPU(current_cpu);
 102
 103    cpu->env.regs[R_EBX] = VMPORT_MAGIC;
 104    return 6;
 105}
 106
 107static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 108{
 109    X86CPU *cpu = X86_CPU(current_cpu);
 110
 111    cpu->env.regs[R_EBX] = 0x1177;
 112    return ram_size;
 113}
 114
 115/* vmmouse helpers */
 116void vmmouse_get_data(uint32_t *data)
 117{
 118    X86CPU *cpu = X86_CPU(current_cpu);
 119    CPUX86State *env = &cpu->env;
 120
 121    data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 122    data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 123    data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 124}
 125
 126void vmmouse_set_data(const uint32_t *data)
 127{
 128    X86CPU *cpu = X86_CPU(current_cpu);
 129    CPUX86State *env = &cpu->env;
 130
 131    env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 132    env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 133    env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 134}
 135
 136static const MemoryRegionOps vmport_ops = {
 137    .read = vmport_ioport_read,
 138    .write = vmport_ioport_write,
 139    .impl = {
 140        .min_access_size = 4,
 141        .max_access_size = 4,
 142    },
 143    .endianness = DEVICE_LITTLE_ENDIAN,
 144};
 145
 146static void vmport_realizefn(DeviceState *dev, Error **errp)
 147{
 148    ISADevice *isadev = ISA_DEVICE(dev);
 149    VMPortState *s = VMPORT(dev);
 150
 151    memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
 152    isa_register_ioport(isadev, &s->io, 0x5658);
 153
 154    port_state = s;
 155    /* Register some generic port commands */
 156    vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 157    vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 158}
 159
 160static void vmport_class_initfn(ObjectClass *klass, void *data)
 161{
 162    DeviceClass *dc = DEVICE_CLASS(klass);
 163
 164    dc->realize = vmport_realizefn;
 165    /* Reason: realize sets global port_state */
 166    dc->cannot_instantiate_with_device_add_yet = true;
 167}
 168
 169static const TypeInfo vmport_info = {
 170    .name          = TYPE_VMPORT,
 171    .parent        = TYPE_ISA_DEVICE,
 172    .instance_size = sizeof(VMPortState),
 173    .class_init    = vmport_class_initfn,
 174};
 175
 176static void vmport_register_types(void)
 177{
 178    type_register_static(&vmport_info);
 179}
 180
 181type_init(vmport_register_types)
 182