kvm-guest-drivers-windows

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/*
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 * Implementation of memory & port access routines required by VirtioLib
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 *
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 * Copyright (c) 2016-2017 Red Hat, Inc.
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 *
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 * Author(s):
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 *  Ladi Prosek <lprosek@redhat.com>
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met :
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and / or other materials provided with the distribution.
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 * 3. Neither the names of the copyright holders nor the names of their contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include "osdep.h"
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#include "virtio_pci.h"
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/* The lower 64k of memory is never mapped so we can use the same routines
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 * for both port I/O and memory access and use the address alone to decide
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 * which space to use.
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 */
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#define PORT_MASK 0xFFFF
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/* READ_REGISTER_* and WRITE_REGISTER_* take volatile ptr in newer DDKs */
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#define _VOLATILE volatile
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#define READ_PORT_OR_REGISTER(address, width)                       \
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    (address & ~PORT_MASK) ?                                        \
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        READ_REGISTER_##width((_VOLATILE width *)address) :         \
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        READ_PORT_##width((width *)address)
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#define WRITE_PORT_OR_REGISTER(address, width, value)               \
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    (address & ~PORT_MASK) ?                                        \
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        WRITE_REGISTER_##width((_VOLATILE width *)address, value) : \
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        WRITE_PORT_##width((width *)address, value)
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u8 ReadVirtIODeviceByte(ULONG_PTR ulRegister)
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{
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    return READ_PORT_OR_REGISTER(ulRegister, UCHAR);
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}
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void WriteVirtIODeviceByte(ULONG_PTR ulRegister, u8 bValue)
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{
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    WRITE_PORT_OR_REGISTER(ulRegister, UCHAR, bValue);
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}
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u16 ReadVirtIODeviceWord(ULONG_PTR ulRegister)
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{
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    return READ_PORT_OR_REGISTER(ulRegister, USHORT);
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}
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void WriteVirtIODeviceWord(ULONG_PTR ulRegister, u16 wValue)
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{
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    WRITE_PORT_OR_REGISTER(ulRegister, USHORT, wValue);
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}
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u32 ReadVirtIODeviceRegister(ULONG_PTR ulRegister)
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{
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    return READ_PORT_OR_REGISTER(ulRegister, ULONG);
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}
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void WriteVirtIODeviceRegister(ULONG_PTR ulRegister, u32 ulValue)
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{
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    WRITE_PORT_OR_REGISTER(ulRegister, ULONG, ulValue);
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}
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