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 #ifdef DEBUG
  27 # define APM_DPRINTF(format, ...)       printf(format, ## __VA_ARGS__)
  28 #else
  29 # define APM_DPRINTF(format, ...)       do { } while (0)
  30 #endif
  31
  32 /* fixed I/O location */
  33 #define APM_CNT_IOPORT  0xb2
  34 #define APM_STS_IOPORT  0xb3
  35
  36 static void apm_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
  37 {
  38     APMState *apm = opaque;
  39     addr &= 1;
  40     APM_DPRINTF("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val);
  41     if (addr == 0) {
  42         apm->apmc = val;
  43
  44         if (apm->callback) {
  45             (apm->callback)(val, apm->arg);
  46         }
  47     } else {
  48         apm->apms = val;
  49     }
  50 }
  51
  52 static uint32_t apm_ioport_readb(void *opaque, uint32_t addr)
  53 {
  54     APMState *apm = opaque;
  55     uint32_t val;
  56
  57     addr &= 1;
  58     if (addr == 0) {
  59         val = apm->apmc;
  60     } else {
  61         val = apm->apms;
  62     }
  63     APM_DPRINTF("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val);
  64     return val;
  65 }
  66
  67 const VMStateDescription vmstate_apm = {
  68     .name = "APM State",
  69     .version_id = 1,
  70     .minimum_version_id = 1,
  71     .minimum_version_id_old = 1,
  72     .fields = (VMStateField[]) {
  73         VMSTATE_UINT8(apmc, APMState),
  74         VMSTATE_UINT8(apms, APMState),
  75         VMSTATE_END_OF_LIST()
  76     }
  77 };
  78
  79 void apm_init(APMState *apm, apm_ctrl_changed_t callback, void *arg)
  80 {
  81     apm->callback = callback;
  82     apm->arg = arg;
  83
  84     /* ioport 0xb2, 0xb3 */
  85     register_ioport_write(APM_CNT_IOPORT, 2, 1, apm_ioport_writeb, apm);
  86     register_ioport_read(APM_CNT_IOPORT, 2, 1, apm_ioport_readb, apm);
  87 }