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 #include "isa.h"
  23
  24 //#define DEBUG
  25
  26 /* fixed I/O location */
  27 #define APM_CNT_IOPORT  0xb2
  28 #define APM_STS_IOPORT  0xb3
  29
  30 static void apm_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
  31 {
  32     APMState *apm = opaque;
  33     addr &= 1;
  34 #ifdef DEBUG
  35     printf("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val);
  36 #endif
  37     if (addr == 0) {
  38         apm->apmc = val;
  39
  40         if (apm->callback) {
  41             (apm->callback)(val, apm->arg);
  42         }
  43     } else {
  44         apm->apms = val;
  45     }
  46 }
  47
  48 static uint32_t apm_ioport_readb(void *opaque, uint32_t addr)
  49 {
  50     APMState *apm = opaque;
  51     uint32_t val;
  52
  53     addr &= 1;
  54     if (addr == 0) {
  55         val = apm->apmc;
  56     } else {
  57         val = apm->apms;
  58     }
  59 #ifdef DEBUG
  60     printf("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val);
  61 #endif
  62     return val;
  63 }
  64
  65 const VMStateDescription vmstate_apm = {
  66     .name = "APM State",
  67     .version_id = 1,
  68     .minimum_version_id = 1,
  69     .minimum_version_id_old = 1,
  70     .fields = (VMStateField[]) {
  71         VMSTATE_UINT8(apmc, APMState),
  72         VMSTATE_UINT8(apms, APMState),
  73         VMSTATE_END_OF_LIST()
  74     }
  75 };
  76
  77 void apm_init(APMState *apm, apm_ctrl_changed_t callback, void *arg)
  78 {
  79     apm->callback = callback;
  80     apm->arg = arg;
  81
  82     /* ioport 0xb2, 0xb3 */
  83     register_ioport_write(APM_CNT_IOPORT, 2, 1, apm_ioport_writeb, apm);
  84     register_ioport_read(APM_CNT_IOPORT, 2, 1, apm_ioport_readb, apm);
  85 }