qemu

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/*
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 * QEMU PC APM controller Emulation
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 * This is split out from acpi.c
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 *
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 * Copyright (c) 2006 Fabrice Bellard
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License version 2.1 as published by the Free Software Foundation.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, see <http://www.gnu.org/licenses/>
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 *
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 * Contributions after 2012-01-13 are licensed under the terms of the
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 * GNU GPL, version 2 or (at your option) any later version.
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 */
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#include "qemu/osdep.h"
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#include "hw/isa/apm.h"
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#include "hw/pci/pci.h"
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#include "migration/vmstate.h"
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#include "trace.h"
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/* fixed I/O location */
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#define APM_STS_IOPORT  0xb3
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static void apm_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,
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                              unsigned size)
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{
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    APMState *apm = opaque;
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    addr &= 1;
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    trace_apm_io_write(addr, val);
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    if (addr == 0) {
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        apm->apmc = val;
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        if (apm->callback) {
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            (apm->callback)(val, apm->arg);
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        }
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    } else {
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        apm->apms = val;
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    }
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}
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static uint64_t apm_ioport_readb(void *opaque, hwaddr addr, unsigned size)
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{
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    APMState *apm = opaque;
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    uint32_t val;
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    addr &= 1;
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    if (addr == 0) {
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        val = apm->apmc;
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    } else {
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        val = apm->apms;
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    }
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    trace_apm_io_read(addr, val);
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    return val;
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}
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const VMStateDescription vmstate_apm = {
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    .name = "APM State",
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    .version_id = 1,
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    .minimum_version_id = 1,
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    .fields = (const VMStateField[]) {
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        VMSTATE_UINT8(apmc, APMState),
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        VMSTATE_UINT8(apms, APMState),
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        VMSTATE_END_OF_LIST()
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    }
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};
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static const MemoryRegionOps apm_ops = {
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    .read = apm_ioport_readb,
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    .write = apm_ioport_writeb,
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    .impl = {
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        .min_access_size = 1,
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        .max_access_size = 1,
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    },
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};
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void apm_init(PCIDevice *dev, APMState *apm, apm_ctrl_changed_t callback,
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              void *arg)
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{
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    apm->callback = callback;
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    apm->arg = arg;
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    /* ioport 0xb2, 0xb3 */
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    memory_region_init_io(&apm->io, OBJECT(dev), &apm_ops, apm, "apm-io", 2);
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    memory_region_add_subregion(pci_address_space_io(dev), APM_CNT_IOPORT,
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                                &apm->io);
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}
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