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
  25 #include "hw.h"
  26 #include "isa.h"
  27 #include "pc.h"
  28 #include "sysemu.h"
  29 #include "qemu-kvm.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 typedef struct _VMPortState
  40 {
  41     IOPortReadFunc *func[VMPORT_ENTRIES];
  42     void *opaque[VMPORT_ENTRIES];
  43 } VMPortState;
  44
  45 static VMPortState port_state;
  46
  47 void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
  48 {
  49     if (command >= VMPORT_ENTRIES)
  50         return;
  51
  52     port_state.func[command] = func;
  53     port_state.opaque[command] = opaque;
  54 }
  55
  56 static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
  57 {
  58     VMPortState *s = opaque;
  59     CPUState *env = cpu_single_env;
  60     unsigned char command;
  61     uint32_t eax;
  62     uint32_t ret;
  63
  64     if (kvm_enabled())
  65         kvm_save_registers(env);
  66
  67     eax = env->regs[R_EAX];
  68     if (eax != VMPORT_MAGIC)
  69         return eax;
  70
  71     command = env->regs[R_ECX];
  72     if (command >= VMPORT_ENTRIES)
  73         return eax;
  74     if (!s->func[command])
  75     {
  76 #ifdef VMPORT_DEBUG
  77         fprintf(stderr, "vmport: unknown command %x\n", command);
  78 #endif
  79         return eax;
  80     }
  81
  82     ret = s->func[command](s->opaque[command], addr);
  83
  84     if (kvm_enabled())
  85         kvm_load_registers(env);
  86
  87     return ret;
  88 }
  89
  90 static void vmport_ioport_write(void *opaque, uint32_t addr, uint32_t val)
  91 {
  92     CPUState *env = cpu_single_env;
  93
  94     env->regs[R_EAX] = vmport_ioport_read(opaque, addr);
  95 }
  96
  97 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  98 {
  99     CPUState *env = cpu_single_env;
 100     env->regs[R_EBX] = VMPORT_MAGIC;
 101     return 6;
 102 }
 103
 104 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 105 {
 106     CPUState *env = cpu_single_env;
 107     env->regs[R_EBX] = 0x1177;
 108     return ram_size;
 109 }
 110
 111 void vmport_init(void)
 112 {
 113     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
 114     register_ioport_write(0x5658, 1, 4, vmport_ioport_write, &port_state);
 115
 116     /* Register some generic port commands */
 117     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 118     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 119 }