LXR qemu/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/isa/isa.h"
  26#include "hw/i386/pc.h"
  27#include "hw/input/i8042.h"
  28#include "sysemu/hw_accel.h"
  29#include "qemu/log.h"
  30#include "trace.h"
  31
  32#define VMPORT_CMD_GETVERSION 0x0a
  33#define VMPORT_CMD_GETRAMSIZE 0x14
  34
  35#define VMPORT_ENTRIES 0x2c
  36#define VMPORT_MAGIC   0x564D5868
  37
  38#define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT)
  39
  40typedef struct VMPortState {
  41    ISADevice parent_obj;
  42
  43    MemoryRegion io;
  44    VMPortReadFunc *func[VMPORT_ENTRIES];
  45    void *opaque[VMPORT_ENTRIES];
  46} VMPortState;
  47
  48static VMPortState *port_state;
  49
  50void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
  51{
  52    if (command >= VMPORT_ENTRIES) {
  53        return;
  54    }
  55
  56    trace_vmport_register(command, func, opaque);
  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
  78    command = env->regs[R_ECX];
  79    trace_vmport_command(command);
  80    if (command >= VMPORT_ENTRIES || !s->func[command]) {
  81        qemu_log_mask(LOG_UNIMP, "vmport: unknown command %x\n", command);
  82        return eax;
  83    }
  84
  85    return s->func[command](s->opaque[command], addr);
  86}
  87
  88static void vmport_ioport_write(void *opaque, hwaddr addr,
  89                                uint64_t val, unsigned size)
  90{
  91    X86CPU *cpu = X86_CPU(current_cpu);
  92
  93    cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
  94}
  95
  96static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  97{
  98    X86CPU *cpu = X86_CPU(current_cpu);
  99
 100    cpu->env.regs[R_EBX] = VMPORT_MAGIC;
 101    return 6;
 102}
 103
 104static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 105{
 106    X86CPU *cpu = X86_CPU(current_cpu);
 107
 108    cpu->env.regs[R_EBX] = 0x1177;
 109    return ram_size;
 110}
 111
 112/* vmmouse helpers */
 113void vmmouse_get_data(uint32_t *data)
 114{
 115    X86CPU *cpu = X86_CPU(current_cpu);
 116    CPUX86State *env = &cpu->env;
 117
 118    data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 119    data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 120    data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 121}
 122
 123void vmmouse_set_data(const uint32_t *data)
 124{
 125    X86CPU *cpu = X86_CPU(current_cpu);
 126    CPUX86State *env = &cpu->env;
 127
 128    env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 129    env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 130    env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 131}
 132
 133static const MemoryRegionOps vmport_ops = {
 134    .read = vmport_ioport_read,
 135    .write = vmport_ioport_write,
 136    .impl = {
 137        .min_access_size = 4,
 138        .max_access_size = 4,
 139    },
 140    .endianness = DEVICE_LITTLE_ENDIAN,
 141};
 142
 143static void vmport_realizefn(DeviceState *dev, Error **errp)
 144{
 145    ISADevice *isadev = ISA_DEVICE(dev);
 146    VMPortState *s = VMPORT(dev);
 147
 148    memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
 149    isa_register_ioport(isadev, &s->io, 0x5658);
 150
 151    port_state = s;
 152    /* Register some generic port commands */
 153    vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 154    vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 155}
 156
 157static void vmport_class_initfn(ObjectClass *klass, void *data)
 158{
 159    DeviceClass *dc = DEVICE_CLASS(klass);
 160
 161    dc->realize = vmport_realizefn;
 162    /* Reason: realize sets global port_state */
 163    dc->user_creatable = false;
 164}
 165
 166static const TypeInfo vmport_info = {
 167    .name          = TYPE_VMPORT,
 168    .parent        = TYPE_ISA_DEVICE,
 169    .instance_size = sizeof(VMPortState),
 170    .class_init    = vmport_class_initfn,
 171};
 172
 173static void vmport_register_types(void)
 174{
 175    type_register_static(&vmport_info);
 176}
 177
 178type_init(vmport_register_types)
 179