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 "sysemu.h"
  28 #include "kvm.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     IOPortReadFunc *func[VMPORT_ENTRIES];
  41     void *opaque[VMPORT_ENTRIES];
  42 } VMPortState;
  43
  44 static VMPortState port_state;
  45
  46 void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
  47 {
  48     if (command >= VMPORT_ENTRIES)
  49         return;
  50
  51     port_state.func[command] = func;
  52     port_state.opaque[command] = opaque;
  53 }
  54
  55 static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
  56 {
  57     VMPortState *s = opaque;
  58     CPUState *env = cpu_single_env;
  59     unsigned char command;
  60     uint32_t eax;
  61
  62     cpu_synchronize_state(env);
  63
  64     eax = env->regs[R_EAX];
  65     if (eax != VMPORT_MAGIC)
  66         return eax;
  67
  68     command = env->regs[R_ECX];
  69     if (command >= VMPORT_ENTRIES)
  70         return eax;
  71     if (!s->func[command])
  72     {
  73 #ifdef VMPORT_DEBUG
  74         fprintf(stderr, "vmport: unknown command %x\n", command);
  75 #endif
  76         return eax;
  77     }
  78
  79     return s->func[command](s->opaque[command], addr);
  80 }
  81
  82 static void vmport_ioport_write(void *opaque, uint32_t addr, uint32_t val)
  83 {
  84     CPUState *env = cpu_single_env;
  85
  86     env->regs[R_EAX] = vmport_ioport_read(opaque, addr);
  87 }
  88
  89 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  90 {
  91     CPUState *env = cpu_single_env;
  92     env->regs[R_EBX] = VMPORT_MAGIC;
  93     return 6;
  94 }
  95
  96 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
  97 {
  98     CPUState *env = cpu_single_env;
  99     env->regs[R_EBX] = 0x1177;
 100     return ram_size;
 101 }
 102
 103 void vmport_init(void)
 104 {
 105     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
 106     register_ioport_write(0x5658, 1, 4, vmport_ioport_write, &port_state);
 107
 108     /* Register some generic port commands */
 109     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 110     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 111 }