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 "vl.h"
  25 #include "cpu-all.h"
  26
  27 #define VMPORT_CMD_GETVERSION 0x0a
  28 #define VMPORT_CMD_GETRAMSIZE 0x14
  29
  30 #define VMPORT_ENTRIES 0x2c
  31 #define VMPORT_MAGIC   0x564D5868
  32
  33 typedef struct _VMPortState
  34 {
  35     CPUState *env;
  36     IOPortReadFunc *func[VMPORT_ENTRIES];
  37     void *opaque[VMPORT_ENTRIES];
  38 } VMPortState;
  39
  40 static VMPortState port_state;
  41
  42 void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
  43 {
  44     if (command >= VMPORT_ENTRIES)
  45         return;
  46
  47     port_state.func[command] = func;
  48     port_state.opaque[command] = opaque;
  49 }
  50
  51 static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
  52 {
  53     VMPortState *s = opaque;
  54     unsigned char command;
  55     uint32_t eax;
  56
  57     eax = s->env->regs[R_EAX];
  58     if (eax != VMPORT_MAGIC)
  59         return eax;
  60
  61     command = s->env->regs[R_ECX];
  62     if (command >= VMPORT_ENTRIES)
  63         return eax;
  64     if (!s->func[command])
  65     {
  66         printf("vmport: unknown command %x\n", command);
  67         return eax;
  68     }
  69
  70     return s->func[command](s->opaque[command], addr);
  71 }
  72
  73 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  74 {
  75     CPUState *env = opaque;
  76     env->regs[R_EBX] = VMPORT_MAGIC;
  77     return 6;
  78 }
  79
  80 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
  81 {
  82     CPUState *env = opaque;
  83     env->regs[R_EBX] = 0x1177;
  84     return ram_size;
  85 }
  86
  87 void vmport_init(CPUState *env)
  88 {
  89     port_state.env = env;
  90
  91     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
  92
  93     /* Register some generic port commands */
  94     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, env);
  95     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, env);
  96 }