hwaccess.h - chromiumos/third_party/flashrom - Git at Google

 /*
  * This file is part of the flashrom project.
  *
  * Copyright (C) 2009 Carl-Daniel Hailfinger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; version 2 of the License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */

 /*
  * Header file for hardware access and OS abstraction. Included from flash.h.
  */

 #ifndef __HWACCESS_H__
 #define __HWACCESS_H__ 1

 #include "platform.h"

 #if NEED_PCI == 1
 /*
  * libpci headers use the variable name "index" which triggers shadowing
  * warnings on systems which have the index() function in a default #include
  * or as builtin.
  */
 #define index shadow_workaround_index

 #if !defined (__NetBSD__)
 #include <pci/pci.h>
 #else
 #include <pciutils/pci.h>
 #endif

 #undef index
 #endif /* NEED_PCI == 1 */


 /* The next big hunk tries to guess endianess from various preprocessor macros */
 /* First some error checking in case some weird header has defined both.
  * NB: OpenBSD always defines _BIG_ENDIAN and _LITTLE_ENDIAN. */
 #if defined (__LITTLE_ENDIAN__) && defined (__BIG_ENDIAN__)
 #error Conflicting endianness #define
 #endif

 #if IS_X86

 /* All x86 is little-endian. */
 #define __FLASHROM_LITTLE_ENDIAN__ 1

 #elif IS_MIPS

 /* MIPS can be either endian. */
 #if defined (__MIPSEL) || defined (__MIPSEL__) || defined (_MIPSEL) || defined (MIPSEL)
 #define __FLASHROM_LITTLE_ENDIAN__ 1
 #elif defined (__MIPSEB) || defined (__MIPSEB__) || defined (_MIPSEB) || defined (MIPSEB)
 #define __FLASHROM_BIG_ENDIAN__ 1
 #endif

 #elif IS_PPC

 /* PowerPC can be either endian. */
 #if defined (_BIG_ENDIAN) || defined (__BIG_ENDIAN__)
 #define __FLASHROM_BIG_ENDIAN__ 1
 #elif defined (_LITTLE_ENDIAN) || defined (__LITTLE_ENDIAN__)
 #define __FLASHROM_LITTLE_ENDIAN__ 1
 #endif

 #elif IS_ARM

 /* ARM can be either endian. */
 #if defined (__ARMEB__)
 #define __FLASHROM_BIG_ENDIAN__ 1
 #elif defined (__ARMEL__)
 #define __FLASHROM_LITTLE_ENDIAN__ 1
 #endif

 #elif IS_SPARC
 /* SPARC is big endian in general (but allows to access data in little endian too). */
 #define __FLASHROM_BIG_ENDIAN__ 1

 #endif /* IS_? */

 #if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)

 /* If architecture-specific approaches fail try generic variants. First: BSD (works about everywhere). */
 #if !IS_WINDOWS
 #include <sys/param.h>

 #if defined (__BYTE_ORDER)
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 #define __FLASHROM_LITTLE_ENDIAN__
 #elif __BYTE_ORDER == __BIG_ENDIAN
 #define __FLASHROM_BIG_ENDIAN__
 #else
 #error Unknown byte order!
 #endif
 #endif /* defined __BYTE_ORDER */
 #endif /* !IS_WINDOWS */

 #if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)

 /* Nonstandard libc-specific macros for determining endianness. */
 /* musl provides an endian.h as well... but it can not be detected from within C. */
 #if defined(__GLIBC__)
 #include <endian.h>
 #if BYTE_ORDER == LITTLE_ENDIAN
 #define __FLASHROM_LITTLE_ENDIAN__ 1
 #elif BYTE_ORDER == BIG_ENDIAN
 #define __FLASHROM_BIG_ENDIAN__ 1
 #endif
 #endif
 #endif

 #endif

 #if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)
 #error Unable to determine endianness.
 #endif

 #define ___constant_swab8(x) ((uint8_t) (				\
 	(((uint8_t)(x) & (uint8_t)0xffU))))

 #define ___constant_swab16(x) ((uint16_t) (				\
 	(((uint16_t)(x) & (uint16_t)0x00ffU) << 8) |			\
 	(((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))

 #define ___constant_swab32(x) ((uint32_t) (				\
 	(((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |		\
 	(((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |		\
 	(((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) |		\
 	(((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))

 #define ___constant_swab64(x) ((uint64_t) (				\
 	(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) |	\
 	(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) |	\
 	(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) |	\
 	(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) |	\
 	(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) |	\
 	(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) |	\
 	(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) |	\
 	(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))

 #if defined (__FLASHROM_BIG_ENDIAN__)

 #define cpu_to_le(bits)							\
 static inline uint##bits##_t cpu_to_le##bits(uint##bits##_t val)	\
 {									\
 	return ___constant_swab##bits(val);				\
 }

 cpu_to_le(8)
 cpu_to_le(16)
 cpu_to_le(32)
 cpu_to_le(64)

 #define cpu_to_be8
 #define cpu_to_be16
 #define cpu_to_be32
 #define cpu_to_be64

 #elif defined (__FLASHROM_LITTLE_ENDIAN__)

 #define cpu_to_be(bits)							\
 static inline uint##bits##_t cpu_to_be##bits(uint##bits##_t val)	\
 {									\
 	return ___constant_swab##bits(val);				\
 }

 cpu_to_be(8)
 cpu_to_be(16)
 cpu_to_be(32)
 cpu_to_be(64)

 #define cpu_to_le8
 #define cpu_to_le16
 #define cpu_to_le32
 #define cpu_to_le64

 #endif /* __FLASHROM_BIG_ENDIAN__ / __FLASHROM_LITTLE_ENDIAN__ */

 #define be_to_cpu8 cpu_to_be8
 #define be_to_cpu16 cpu_to_be16
 #define be_to_cpu32 cpu_to_be32
 #define be_to_cpu64 cpu_to_be64
 #define le_to_cpu8 cpu_to_le8
 #define le_to_cpu16 cpu_to_le16
 #define le_to_cpu32 cpu_to_le32
 #define le_to_cpu64 cpu_to_le64

 #if NEED_PCI == 1
 #if IS_X86

 /* sys/io.h provides iopl(2) and x86 I/O port access functions (inb, outb etc).
  * It is included in glibc (thus available also on debian/kFreeBSD) but also in other libcs that mimic glibc,
  * e.g. musl and uclibc. Because we cannot detect the libc or existence of the header or of the instructions
  * themselves safely in here we use some heuristic below:
  * On Android we don't have the header file and no way for I/O port access at all. However, sys/glibc-syscalls.h
  * refers to an iopl implementation and we therefore include at least that one for now. On non-Android we assume
  * that a Linux system's libc has a suitable sys/io.h or (on non-Linux) we depend on glibc to offer it. */
 #if defined(__ANDROID__)
 #include <sys/glibc-syscalls.h>
 #elif defined(__linux__) || defined(__GLIBC__)
 #include <sys/io.h>
 #endif

 #define __FLASHROM_HAVE_OUTB__ 1

 /* for iopl and outb under Solaris */
 #if defined (__sun)
 #include <sys/sysi86.h>
 #include <sys/psw.h>
 #include <asm/sunddi.h>
 #endif

 /* Clarification about OUTB/OUTW/OUTL argument order:
  * OUT[BWL](val, port)
  */

 #if defined(__FreeBSD__) || defined(__DragonFly__)
   /* Note that Debian/kFreeBSD (FreeBSD kernel with glibc) has conflicting
    * out[bwl] definitions in machine/cpufunc.h and sys/io.h at least in some
    * versions. Use machine/cpufunc.h only for plain FreeBSD/DragonFlyBSD.
    */
   #include <sys/types.h>
   #include <machine/cpufunc.h>
   #define OUTB(x, y) do { u_int outb_tmp = (y); outb(outb_tmp, (x)); } while (0)
   #define OUTW(x, y) do { u_int outw_tmp = (y); outw(outw_tmp, (x)); } while (0)
   #define OUTL(x, y) do { u_int outl_tmp = (y); outl(outl_tmp, (x)); } while (0)
   #define INB(x) __extension__ ({ u_int inb_tmp = (x); inb(inb_tmp); })
   #define INW(x) __extension__ ({ u_int inw_tmp = (x); inw(inw_tmp); })
   #define INL(x) __extension__ ({ u_int inl_tmp = (x); inl(inl_tmp); })
 #else

 #if defined (__sun)
   /* Note different order for outb */
   #define OUTB(x,y) outb(y, x)
   #define OUTW(x,y) outw(y, x)
   #define OUTL(x,y) outl(y, x)
   #define INB  inb
   #define INW  inw
   #define INL  inl
 #else

 #ifdef __DJGPP__

 #include <pc.h>

   #define OUTB(x,y) outportb(y, x)
   #define OUTW(x,y) outportw(y, x)
   #define OUTL(x,y) outportl(y, x)

   #define INB  inportb
   #define INW  inportw
   #define INL  inportl

 #else

 #if defined(__MACH__) && defined(__APPLE__)
     /* Header is part of the DirectHW library. */
     #include <DirectHW/DirectHW.h>
 #endif

   /* This is the usual glibc interface. */
   #define OUTB outb
   #define OUTW outw
   #define OUTL outl
   #define INB  inb
   #define INW  inw
   #define INL  inl
 #endif
 #endif
 #endif

 #if defined(__NetBSD__) || defined (__OpenBSD__)
   #if defined(__i386__) || defined(__x86_64__)
     #include <sys/types.h>
     #include <machine/sysarch.h>
     #if defined(__NetBSD__)
       #if defined(__i386__)
         #define iopl i386_iopl
       #elif defined(__x86_64__)
         #define iopl x86_64_iopl
       #endif
     #elif defined (__OpenBSD__)
       #if defined(__i386__)
         #define iopl i386_iopl
       #elif defined(__amd64__)
         #define iopl amd64_iopl
       #endif
     #endif

 static inline void outb(uint8_t value, uint16_t port)
 {
 	__asm__ volatile ("outb %b0,%w1": :"a" (value), "Nd" (port));
 }

 static inline uint8_t inb(uint16_t port)
 {
 	uint8_t value;
 	__asm__ volatile ("inb %w1,%0":"=a" (value):"Nd" (port));
 	return value;
 }

 static inline void outw(uint16_t value, uint16_t port)
 {
 	__asm__ volatile ("outw %w0,%w1": :"a" (value), "Nd" (port));
 }

 static inline uint16_t inw(uint16_t port)
 {
 	uint16_t value;
 	__asm__ volatile ("inw %w1,%0":"=a" (value):"Nd" (port));
 	return value;
 }

 static inline void outl(uint32_t value, uint16_t port)
 {
 	__asm__ volatile ("outl %0,%w1": :"a" (value), "Nd" (port));
 }

 static inline uint32_t inl(uint16_t port)
 {
 	uint32_t value;
 	__asm__ volatile ("inl %1,%0":"=a" (value):"Nd" (port));
 	return value;
 }
   #endif
 #endif

 #if !(defined(__MACH__) && defined(__APPLE__)) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined(__DragonFly__) && !defined(__LIBPAYLOAD__)
 typedef struct { uint32_t hi, lo; } msr_t;
 msr_t rdmsr(int addr);
 int wrmsr(int addr, msr_t msr);
 #endif
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 /* FreeBSD already has conflicting definitions for wrmsr/rdmsr. */
 #undef rdmsr
 #undef wrmsr
 #define rdmsr freebsd_rdmsr
 #define wrmsr freebsd_wrmsr
 typedef struct { uint32_t hi, lo; } msr_t;
 msr_t freebsd_rdmsr(int addr);
 int freebsd_wrmsr(int addr, msr_t msr);
 #endif
 #if defined(__LIBPAYLOAD__)
 #include <arch/io.h>
 #include <arch/msr.h>
 typedef struct { uint32_t hi, lo; } msr_t;
 msr_t libpayload_rdmsr(int addr);
 int libpayload_wrmsr(int addr, msr_t msr);
 #undef rdmsr
 #define rdmsr libpayload_rdmsr
 #define wrmsr libpayload_wrmsr
 #endif

 #elif IS_PPC

 /* PCI port I/O is not yet implemented on PowerPC. */

 #elif IS_MIPS

 /* PCI port I/O is not yet implemented on MIPS. */

 #elif IS_SPARC

 /* PCI port I/O is not yet implemented on SPARC. */

 #elif IS_ARM

 /* Non memory mapped I/O is not supported on ARM. */

 #else

 #error Unknown architecture, please check if it supports PCI port IO.

 #endif /* IS_* */
 #endif /* NEED_PCI == 1 */

 #endif /* !__HWACCESS_H__ */
	/*
	* This file is part of the flashrom project.
	*
	* Copyright (C) 2009 Carl-Daniel Hailfinger
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; version 2 of the License.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	/*
	* Header file for hardware access and OS abstraction. Included from flash.h.
	*/

	#ifndef __HWACCESS_H__
	#define __HWACCESS_H__ 1

	#include "platform.h"

	#if NEED_PCI == 1
	/*
	* libpci headers use the variable name "index" which triggers shadowing
	* warnings on systems which have the index() function in a default #include
	* or as builtin.
	*/
	#define index shadow_workaround_index

	#if !defined (__NetBSD__)
	#include <pci/pci.h>
	#else
	#include <pciutils/pci.h>
	#endif

	#undef index
	#endif /* NEED_PCI == 1 */


	/* The next big hunk tries to guess endianess from various preprocessor macros */
	/* First some error checking in case some weird header has defined both.
	* NB: OpenBSD always defines _BIG_ENDIAN and _LITTLE_ENDIAN. */
	#if defined (__LITTLE_ENDIAN__) && defined (__BIG_ENDIAN__)
	#error Conflicting endianness #define
	#endif

	#if IS_X86

	/* All x86 is little-endian. */
	#define __FLASHROM_LITTLE_ENDIAN__ 1

	#elif IS_MIPS

	/* MIPS can be either endian. */
	#if defined (__MIPSEL) \|\| defined (__MIPSEL__) \|\| defined (_MIPSEL) \|\| defined (MIPSEL)
	#define __FLASHROM_LITTLE_ENDIAN__ 1
	#elif defined (__MIPSEB) \|\| defined (__MIPSEB__) \|\| defined (_MIPSEB) \|\| defined (MIPSEB)
	#define __FLASHROM_BIG_ENDIAN__ 1
	#endif

	#elif IS_PPC

	/* PowerPC can be either endian. */
	#if defined (_BIG_ENDIAN) \|\| defined (__BIG_ENDIAN__)
	#define __FLASHROM_BIG_ENDIAN__ 1
	#elif defined (_LITTLE_ENDIAN) \|\| defined (__LITTLE_ENDIAN__)
	#define __FLASHROM_LITTLE_ENDIAN__ 1
	#endif

	#elif IS_ARM

	/* ARM can be either endian. */
	#if defined (__ARMEB__)
	#define __FLASHROM_BIG_ENDIAN__ 1
	#elif defined (__ARMEL__)
	#define __FLASHROM_LITTLE_ENDIAN__ 1
	#endif

	#elif IS_SPARC
	/* SPARC is big endian in general (but allows to access data in little endian too). */
	#define __FLASHROM_BIG_ENDIAN__ 1

	#endif /* IS_? */

	#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)

	/* If architecture-specific approaches fail try generic variants. First: BSD (works about everywhere). */
	#if !IS_WINDOWS
	#include <sys/param.h>

	#if defined (__BYTE_ORDER)
	#if __BYTE_ORDER == __LITTLE_ENDIAN
	#define __FLASHROM_LITTLE_ENDIAN__
	#elif __BYTE_ORDER == __BIG_ENDIAN
	#define __FLASHROM_BIG_ENDIAN__
	#else
	#error Unknown byte order!
	#endif
	#endif /* defined __BYTE_ORDER */
	#endif /* !IS_WINDOWS */

	#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)

	/* Nonstandard libc-specific macros for determining endianness. */
	/* musl provides an endian.h as well... but it can not be detected from within C. */
	#if defined(__GLIBC__)
	#include <endian.h>
	#if BYTE_ORDER == LITTLE_ENDIAN
	#define __FLASHROM_LITTLE_ENDIAN__ 1
	#elif BYTE_ORDER == BIG_ENDIAN
	#define __FLASHROM_BIG_ENDIAN__ 1
	#endif
	#endif
	#endif

	#endif

	#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)
	#error Unable to determine endianness.
	#endif

	#define ___constant_swab8(x) ((uint8_t) ( \
	(((uint8_t)(x) & (uint8_t)0xffU))))

	#define ___constant_swab16(x) ((uint16_t) ( \
	(((uint16_t)(x) & (uint16_t)0x00ffU) << 8) \| \
	(((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))

	#define ___constant_swab32(x) ((uint32_t) ( \
	(((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) \| \
	(((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) \| \
	(((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) \| \
	(((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))

	#define ___constant_swab64(x) ((uint64_t) ( \
	(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) \| \
	(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) \| \
	(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) \| \
	(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) \| \
	(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) \| \
	(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) \| \
	(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) \| \
	(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))

	#if defined (__FLASHROM_BIG_ENDIAN__)

	#define cpu_to_le(bits) \
	static inline uint##bits##_t cpu_to_le##bits(uint##bits##_t val) \
	{ \
	return ___constant_swab##bits(val); \
	}

	cpu_to_le(8)
	cpu_to_le(16)
	cpu_to_le(32)
	cpu_to_le(64)

	#define cpu_to_be8
	#define cpu_to_be16
	#define cpu_to_be32
	#define cpu_to_be64

	#elif defined (__FLASHROM_LITTLE_ENDIAN__)

	#define cpu_to_be(bits) \
	static inline uint##bits##_t cpu_to_be##bits(uint##bits##_t val) \
	{ \
	return ___constant_swab##bits(val); \
	}

	cpu_to_be(8)
	cpu_to_be(16)
	cpu_to_be(32)
	cpu_to_be(64)

	#define cpu_to_le8
	#define cpu_to_le16
	#define cpu_to_le32
	#define cpu_to_le64

	#endif /* __FLASHROM_BIG_ENDIAN__ / __FLASHROM_LITTLE_ENDIAN__ */

	#define be_to_cpu8 cpu_to_be8
	#define be_to_cpu16 cpu_to_be16
	#define be_to_cpu32 cpu_to_be32
	#define be_to_cpu64 cpu_to_be64
	#define le_to_cpu8 cpu_to_le8
	#define le_to_cpu16 cpu_to_le16
	#define le_to_cpu32 cpu_to_le32
	#define le_to_cpu64 cpu_to_le64

	#if NEED_PCI == 1
	#if IS_X86

	/* sys/io.h provides iopl(2) and x86 I/O port access functions (inb, outb etc).
	* It is included in glibc (thus available also on debian/kFreeBSD) but also in other libcs that mimic glibc,
	* e.g. musl and uclibc. Because we cannot detect the libc or existence of the header or of the instructions
	* themselves safely in here we use some heuristic below:
	* On Android we don't have the header file and no way for I/O port access at all. However, sys/glibc-syscalls.h
	* refers to an iopl implementation and we therefore include at least that one for now. On non-Android we assume
	* that a Linux system's libc has a suitable sys/io.h or (on non-Linux) we depend on glibc to offer it. */
	#if defined(__ANDROID__)
	#include <sys/glibc-syscalls.h>
	#elif defined(__linux__) \|\| defined(__GLIBC__)
	#include <sys/io.h>
	#endif

	#define __FLASHROM_HAVE_OUTB__ 1

	/* for iopl and outb under Solaris */
	#if defined (__sun)
	#include <sys/sysi86.h>
	#include <sys/psw.h>
	#include <asm/sunddi.h>
	#endif

	/* Clarification about OUTB/OUTW/OUTL argument order:
	* OUT[BWL](val, port)
	*/

	#if defined(__FreeBSD__) \|\| defined(__DragonFly__)
	/* Note that Debian/kFreeBSD (FreeBSD kernel with glibc) has conflicting
	* out[bwl] definitions in machine/cpufunc.h and sys/io.h at least in some
	* versions. Use machine/cpufunc.h only for plain FreeBSD/DragonFlyBSD.
	*/
	#include <sys/types.h>
	#include <machine/cpufunc.h>
	#define OUTB(x, y) do { u_int outb_tmp = (y); outb(outb_tmp, (x)); } while (0)
	#define OUTW(x, y) do { u_int outw_tmp = (y); outw(outw_tmp, (x)); } while (0)
	#define OUTL(x, y) do { u_int outl_tmp = (y); outl(outl_tmp, (x)); } while (0)
	#define INB(x) __extension__ ({ u_int inb_tmp = (x); inb(inb_tmp); })
	#define INW(x) __extension__ ({ u_int inw_tmp = (x); inw(inw_tmp); })
	#define INL(x) __extension__ ({ u_int inl_tmp = (x); inl(inl_tmp); })
	#else

	#if defined (__sun)
	/* Note different order for outb */
	#define OUTB(x,y) outb(y, x)
	#define OUTW(x,y) outw(y, x)
	#define OUTL(x,y) outl(y, x)
	#define INB inb
	#define INW inw
	#define INL inl
	#else

	#ifdef __DJGPP__

	#include <pc.h>

	#define OUTB(x,y) outportb(y, x)
	#define OUTW(x,y) outportw(y, x)
	#define OUTL(x,y) outportl(y, x)

	#define INB inportb
	#define INW inportw
	#define INL inportl

	#else

	#if defined(__MACH__) && defined(__APPLE__)
	/* Header is part of the DirectHW library. */
	#include <DirectHW/DirectHW.h>
	#endif

	/* This is the usual glibc interface. */
	#define OUTB outb
	#define OUTW outw
	#define OUTL outl
	#define INB inb
	#define INW inw
	#define INL inl
	#endif
	#endif
	#endif

	#if defined(__NetBSD__) \|\| defined (__OpenBSD__)
	#if defined(__i386__) \|\| defined(__x86_64__)
	#include <sys/types.h>
	#include <machine/sysarch.h>
	#if defined(__NetBSD__)
	#if defined(__i386__)
	#define iopl i386_iopl
	#elif defined(__x86_64__)
	#define iopl x86_64_iopl
	#endif
	#elif defined (__OpenBSD__)
	#if defined(__i386__)
	#define iopl i386_iopl
	#elif defined(__amd64__)
	#define iopl amd64_iopl
	#endif
	#endif

	static inline void outb(uint8_t value, uint16_t port)
	{
	__asm__ volatile ("outb %b0,%w1": :"a" (value), "Nd" (port));
	}

	static inline uint8_t inb(uint16_t port)
	{
	uint8_t value;
	__asm__ volatile ("inb %w1,%0":"=a" (value):"Nd" (port));
	return value;
	}

	static inline void outw(uint16_t value, uint16_t port)
	{
	__asm__ volatile ("outw %w0,%w1": :"a" (value), "Nd" (port));
	}

	static inline uint16_t inw(uint16_t port)
	{
	uint16_t value;
	__asm__ volatile ("inw %w1,%0":"=a" (value):"Nd" (port));
	return value;
	}

	static inline void outl(uint32_t value, uint16_t port)
	{
	__asm__ volatile ("outl %0,%w1": :"a" (value), "Nd" (port));
	}

	static inline uint32_t inl(uint16_t port)
	{
	uint32_t value;
	__asm__ volatile ("inl %1,%0":"=a" (value):"Nd" (port));
	return value;
	}
	#endif
	#endif

	#if !(defined(__MACH__) && defined(__APPLE__)) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined(__DragonFly__) && !defined(__LIBPAYLOAD__)
	typedef struct { uint32_t hi, lo; } msr_t;
	msr_t rdmsr(int addr);
	int wrmsr(int addr, msr_t msr);
	#endif
	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__) \|\| defined(__DragonFly__)
	/* FreeBSD already has conflicting definitions for wrmsr/rdmsr. */
	#undef rdmsr
	#undef wrmsr
	#define rdmsr freebsd_rdmsr
	#define wrmsr freebsd_wrmsr
	typedef struct { uint32_t hi, lo; } msr_t;
	msr_t freebsd_rdmsr(int addr);
	int freebsd_wrmsr(int addr, msr_t msr);
	#endif
	#if defined(__LIBPAYLOAD__)
	#include <arch/io.h>
	#include <arch/msr.h>
	typedef struct { uint32_t hi, lo; } msr_t;
	msr_t libpayload_rdmsr(int addr);
	int libpayload_wrmsr(int addr, msr_t msr);
	#undef rdmsr
	#define rdmsr libpayload_rdmsr
	#define wrmsr libpayload_wrmsr
	#endif

	#elif IS_PPC

	/* PCI port I/O is not yet implemented on PowerPC. */

	#elif IS_MIPS

	/* PCI port I/O is not yet implemented on MIPS. */

	#elif IS_SPARC

	/* PCI port I/O is not yet implemented on SPARC. */

	#elif IS_ARM

	/* Non memory mapped I/O is not supported on ARM. */

	#else

	#error Unknown architecture, please check if it supports PCI port IO.

	#endif /* IS_* */
	#endif /* NEED_PCI == 1 */

	#endif /* !__HWACCESS_H__ */