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  * Contributions after 2012-01-13 are licensed under the terms of the
  20  * GNU GPL, version 2 or (at your option) any later version.
  21  */
  22
  23 #include "apm.h"
  24 #include "hw.h"
  25
  26 //#define DEBUG
  27
  28 #ifdef DEBUG
  29 # define APM_DPRINTF(format, ...)       printf(format, ## __VA_ARGS__)
  30 #else
  31 # define APM_DPRINTF(format, ...)       do { } while (0)
  32 #endif
  33
  34 /* fixed I/O location */
  35 #define APM_CNT_IOPORT  0xb2
  36 #define APM_STS_IOPORT  0xb3
  37
  38 static void apm_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
  39 {
  40     APMState *apm = opaque;
  41     addr &= 1;
  42     APM_DPRINTF("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val);
  43     if (addr == 0) {
  44         apm->apmc = val;
  45
  46         if (apm->callback) {
  47             (apm->callback)(val, apm->arg);
  48         }
  49     } else {
  50         apm->apms = val;
  51     }
  52 }
  53
  54 static uint32_t apm_ioport_readb(void *opaque, uint32_t addr)
  55 {
  56     APMState *apm = opaque;
  57     uint32_t val;
  58
  59     addr &= 1;
  60     if (addr == 0) {
  61         val = apm->apmc;
  62     } else {
  63         val = apm->apms;
  64     }
  65     APM_DPRINTF("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val);
  66     return val;
  67 }
  68
  69 const VMStateDescription vmstate_apm = {
  70     .name = "APM State",
  71     .version_id = 1,
  72     .minimum_version_id = 1,
  73     .minimum_version_id_old = 1,
  74     .fields = (VMStateField[]) {
  75         VMSTATE_UINT8(apmc, APMState),
  76         VMSTATE_UINT8(apms, APMState),
  77         VMSTATE_END_OF_LIST()
  78     }
  79 };
  80
  81 void apm_init(APMState *apm, apm_ctrl_changed_t callback, void *arg)
  82 {
  83     apm->callback = callback;
  84     apm->arg = arg;
  85
  86     /* ioport 0xb2, 0xb3 */
  87     register_ioport_write(APM_CNT_IOPORT, 2, 1, apm_ioport_writeb, apm);
  88     register_ioport_read(APM_CNT_IOPORT, 2, 1, apm_ioport_readb, apm);
  89 }