hw/apm.c

   1 /*
   2  * QEMU PC APM controller Emulation
   3  * This is split out from acpi.c
   4  *
   5  * Copyright (c) 2006 Fabrice Bellard
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License version 2 as published by the Free Software Foundation.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  18  */
  19
  20 #include "apm.h"
  21 #include "hw.h"
  22
  23 //#define DEBUG
  24
  25 #ifdef DEBUG
  26 # define APM_DPRINTF(format, ...)       printf(format, ## __VA_ARGS__)
  27 #else
  28 # define APM_DPRINTF(format, ...)       do { } while (0)
  29 #endif
  30
  31 /* fixed I/O location */
  32 #define APM_CNT_IOPORT  0xb2
  33 #define APM_STS_IOPORT  0xb3
  34
  35 static void apm_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
  36 {
  37     APMState *apm = opaque;
  38     addr &= 1;
  39     APM_DPRINTF("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val);
  40     if (addr == 0) {
  41         apm->apmc = val;
  42
  43         if (apm->callback) {
  44             (apm->callback)(val, apm->arg);
  45         }
  46     } else {
  47         apm->apms = val;
  48     }
  49 }
  50
  51 static uint32_t apm_ioport_readb(void *opaque, uint32_t addr)
  52 {
  53     APMState *apm = opaque;
  54     uint32_t val;
  55
  56     addr &= 1;
  57     if (addr == 0) {
  58         val = apm->apmc;
  59     } else {
  60         val = apm->apms;
  61     }
  62     APM_DPRINTF("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val);
  63     return val;
  64 }
  65
  66 const VMStateDescription vmstate_apm = {
  67     .name = "APM State",
  68     .version_id = 1,
  69     .minimum_version_id = 1,
  70     .minimum_version_id_old = 1,
  71     .fields = (VMStateField[]) {
  72         VMSTATE_UINT8(apmc, APMState),
  73         VMSTATE_UINT8(apms, APMState),
  74         VMSTATE_END_OF_LIST()
  75     }
  76 };
  77
  78 void apm_init(APMState *apm, apm_ctrl_changed_t callback, void *arg)
  79 {
  80     apm->callback = callback;
  81     apm->arg = arg;
  82
  83     /* ioport 0xb2, 0xb3 */
  84     register_ioport_write(APM_CNT_IOPORT, 2, 1, apm_ioport_writeb, apm);
  85     register_ioport_read(APM_CNT_IOPORT, 2, 1, apm_ioport_readb, apm);
  86 }