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/* This file is derived from source code used in MIT's 6.828
course. The original copyright notice is reproduced in full
below. */
/*
* Copyright (C) 1997 Massachusetts Institute of Technology
*
* This software is being provided by the copyright holders under the
* following license. By obtaining, using and/or copying this software,
* you agree that you have read, understood, and will comply with the
* following terms and conditions:
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose and without fee or royalty is
* hereby granted, provided that the full text of this NOTICE appears on
* ALL copies of the software and documentation or portions thereof,
* including modifications, that you make.
*
* THIS SOFTWARE IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE,
* BUT NOT LIMITATION, COPYRIGHT HOLDERS MAKE NO REPRESENTATIONS OR
* WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR
* THAT THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY
* THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS. COPYRIGHT
* HOLDERS WILL BEAR NO LIABILITY FOR ANY USE OF THIS SOFTWARE OR
* DOCUMENTATION.
*
* The name and trademarks of copyright holders may NOT be used in
* advertising or publicity pertaining to the software without specific,
* written prior permission. Title to copyright in this software and any
* associated documentation will at all times remain with copyright
* holders. See the file AUTHORS which should have accompanied this software
* for a list of all copyright holders.
*
* This file may be derived from previously copyrighted software. This
* copyright applies only to those changes made by the copyright
* holders listed in the AUTHORS file. The rest of this file is covered by
* the copyright notices, if any, listed below.
*/
#ifndef THREADS_IO_H
#define THREADS_IO_H
#include <stddef.h>
#include <stdint.h>
/* Reads and returns a byte from PORT. */
static inline uint8_t
inb (uint16_t port)
{
/* See [IA32-v2a] "IN". */
uint8_t data;
asm volatile ("inb %w1,%0" : "=a" (data) : "d" (port));
return data;
}
/* Reads CNT bytes from PORT, one after another, and stores them
into the buffer starting at ADDR. */
static inline void
insb (uint16_t port, void *addr, size_t cnt)
{
/* See [IA32-v2a] "INS". */
asm volatile ("cld; repne; insb"
: "=D" (addr), "=c" (cnt)
: "d" (port), "0" (addr), "1" (cnt)
: "memory", "cc");
}
/* Reads and returns 16 bits from PORT. */
static inline uint16_t
inw (uint16_t port)
{
uint16_t data;
/* See [IA32-v2a] "IN". */
asm volatile ("inw %w1,%0" : "=a" (data) : "d" (port));
return data;
}
/* Reads CNT 16-bit (halfword) units from PORT, one after
another, and stores them into the buffer starting at ADDR. */
static inline void
insw (uint16_t port, void *addr, size_t cnt)
{
/* See [IA32-v2a] "INS". */
asm volatile ("cld; repne; insw"
: "=D" (addr), "=c" (cnt)
: "d" (port), "0" (addr), "1" (cnt)
: "memory", "cc");
}
/* Reads and returns 32 bits from PORT. */
static inline uint32_t
inl (uint16_t port)
{
/* See [IA32-v2a] "IN". */
uint32_t data;
asm volatile ("inl %w1,%0" : "=a" (data) : "d" (port));
return data;
}
/* Reads CNT 32-bit (word) units from PORT, one after another,
and stores them into the buffer starting at ADDR. */
static inline void
insl (uint16_t port, void *addr, size_t cnt)
{
/* See [IA32-v2a] "INS". */
asm volatile ("cld; repne; insl"
: "=D" (addr), "=c" (cnt)
: "d" (port), "0" (addr), "1" (cnt)
: "memory", "cc");
}
/* Writes byte DATA to PORT. */
static inline void
outb (uint16_t port, uint8_t data)
{
/* See [IA32-v2b] "OUT". */
asm volatile ("outb %0,%w1" : : "a" (data), "d" (port));
}
/* Writes to PORT each byte of data in the CNT-byte buffer
starting at ADDR. */
static inline void
outsb (uint16_t port, const void *addr, size_t cnt)
{
/* See [IA32-v2b] "OUTS". */
asm volatile ("cld; repne; outsb"
: "=S" (addr), "=c" (cnt)
: "d" (port), "0" (addr), "1" (cnt)
: "cc");
}
/* Writes the 16-bit DATA to PORT. */
static inline void
outw (uint16_t port, uint16_t data)
{
/* See [IA32-v2b] "OUT". */
asm volatile ("outw %0,%w1" : : "a" (data), "d" (port));
}
/* Writes to PORT each 16-bit unit (halfword) of data in the
CNT-halfword buffer starting at ADDR. */
static inline void
outsw (uint16_t port, const void *addr, size_t cnt)
{
/* See [IA32-v2b] "OUTS". */
asm volatile ("cld; repne; outsw"
: "=S" (addr), "=c" (cnt)
: "d" (port), "0" (addr), "1" (cnt)
: "cc");
}
/* Writes the 32-bit DATA to PORT. */
static inline void
outl (uint16_t port, uint32_t data)
{
/* See [IA32-v2b] "OUT". */
asm volatile ("outl %0,%w1" : : "a" (data), "d" (port));
}
/* Writes to PORT each 32-bit unit (word) of data in the CNT-word
buffer starting at ADDR. */
static inline void
outsl (uint16_t port, const void *addr, size_t cnt)
{
/* See [IA32-v2b] "OUTS". */
asm volatile ("cld; repne; outsl"
: "=S" (addr), "=c" (cnt)
: "d" (port), "0" (addr), "1" (cnt)
: "cc");
}
#endif /* threads/io.h */
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