/****************************************************************************
* arch/x86/include/i486/io.h
* arch/chip/io.h
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/* This file should never be included directed but, rather, only indirectly
* through arch/io.h
*/
#ifndef __ARCH_X86_INCLUDE_I486_IO_H
#define __ARCH_X86_INCLUDE_I486_IO_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdint.h>
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Public Types
****************************************************************************/
#ifndef __ASSEMBLY__
/****************************************************************************
* Inline functions
****************************************************************************/
/* Standard x86 Port I/O */
static inline void outb(uint8_t regval, uint16_t port)
{
asm volatile(
"\toutb %0,%1\n"
:
: "a" (regval), "dN" (port)
);
}
static inline uint8_t inb(uint16_t port)
{
uint8_t regval;
asm volatile(
"\tinb %1,%0\n"
: "=a" (regval)
: "dN" (port)
);
return regval;
}
static inline void outw(uint16_t regval, uint16_t port)
{
asm volatile(
"\toutw %0,%1\n"
:
: "a" (regval), "dN" (port)
);
}
static inline uint16_t inw(uint16_t port)
{
uint16_t regval;
asm volatile(
"\tinw %1,%0\n"
: "=a" (regval)
: "dN" (port)
);
return regval;
}
static inline void outl(uint32_t regval, uint16_t port)
{
asm volatile(
"\toutl %0,%1\n"
:
: "a" (regval), "dN" (port)
);
}
static inline uint32_t inl(uint32_t port)
{
uint32_t regval;
asm volatile(
"\tinl %1,%0\n"
: "=a" (regval)
: "dN" (port)
);
return regval;
}
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
EXTERN void outp(char p, char c);
EXTERN char inp(char p);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_X86_INCLUDE_I486_IO_H */
