Annotation of qemu/hw/apm.c, revision 1.1

1.1     ! root        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: }

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