hw/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 "hw.h"
  25 #include "isa.h"
  26 #include "pc.h"
  27 #include "kvm.h"
  28 #include "qdev.h"
  29
  30 //#define VMPORT_DEBUG
  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 typedef struct _VMPortState
  39 {
  40     ISADevice dev;
  41     MemoryRegion io;
  42     IOPortReadFunc *func[VMPORT_ENTRIES];
  43     void *opaque[VMPORT_ENTRIES];
  44 } VMPortState;
  45
  46 static VMPortState *port_state;
  47
  48 void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
  49 {
  50     if (command >= VMPORT_ENTRIES)
  51         return;
  52
  53     port_state->func[command] = func;
  54     port_state->opaque[command] = opaque;
  55 }
  56
  57 static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
  58 {
  59     VMPortState *s = opaque;
  60     CPUState *env = cpu_single_env;
  61     unsigned char command;
  62     uint32_t eax;
  63
  64     cpu_synchronize_state(env);
  65
  66     eax = env->regs[R_EAX];
  67     if (eax != VMPORT_MAGIC)
  68         return eax;
  69
  70     command = env->regs[R_ECX];
  71     if (command >= VMPORT_ENTRIES)
  72         return eax;
  73     if (!s->func[command])
  74     {
  75 #ifdef VMPORT_DEBUG
  76         fprintf(stderr, "vmport: unknown command %x\n", command);
  77 #endif
  78         return eax;
  79     }
  80
  81     return s->func[command](s->opaque[command], addr);
  82 }
  83
  84 static void vmport_ioport_write(void *opaque, uint32_t addr, uint32_t val)
  85 {
  86     CPUState *env = cpu_single_env;
  87
  88     env->regs[R_EAX] = vmport_ioport_read(opaque, addr);
  89 }
  90
  91 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  92 {
  93     CPUState *env = cpu_single_env;
  94     env->regs[R_EBX] = VMPORT_MAGIC;
  95     return 6;
  96 }
  97
  98 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
  99 {
 100     CPUState *env = cpu_single_env;
 101     env->regs[R_EBX] = 0x1177;
 102     return ram_size;
 103 }
 104
 105 /* vmmouse helpers */
 106 void vmmouse_get_data(uint32_t *data)
 107 {
 108     CPUState *env = cpu_single_env;
 109
 110     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 111     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 112     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 113 }
 114
 115 void vmmouse_set_data(const uint32_t *data)
 116 {
 117     CPUState *env = cpu_single_env;
 118
 119     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 120     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 121     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 122 }
 123
 124 static const MemoryRegionPortio vmport_portio[] = {
 125     {0, 1, 4, .read = vmport_ioport_read, .write = vmport_ioport_write },
 126     PORTIO_END_OF_LIST(),
 127 };
 128
 129 static const MemoryRegionOps vmport_ops = {
 130     .old_portio = vmport_portio
 131 };
 132
 133 static int vmport_initfn(ISADevice *dev)
 134 {
 135     VMPortState *s = DO_UPCAST(VMPortState, dev, dev);
 136
 137     memory_region_init_io(&s->io, &vmport_ops, s, "vmport", 1);
 138     isa_register_ioport(dev, &s->io, 0x5658);
 139
 140     port_state = s;
 141     /* Register some generic port commands */
 142     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 143     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 144     return 0;
 145 }
 146
 147 static ISADeviceInfo vmport_info = {
 148     .qdev.name     = "vmport",
 149     .qdev.size     = sizeof(VMPortState),
 150     .qdev.no_user  = 1,
 151     .init          = vmport_initfn,
 152 };
 153
 154 static void vmport_dev_register(void)
 155 {
 156     isa_qdev_register(&vmport_info);
 157 }
 158 device_init(vmport_dev_register)