freebsd-skq/sys/alpha/include/bwx.h
Doug Rabson eb06360f04 Add functions which allow i/o memory to be accessed without forcing a
memory barrier (needed for XFree86 4.0).

Approved by: jkh
2000-02-12 14:57:01 +00:00

104 lines
2.9 KiB
C

/*-
* Copyright (c) 1998 Doug Rabson
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _MACHINE_BWX_H_
#define _MACHINE_BWX_H_
/*
* Byte/word accesses must be made with particular values for addr<37,38>
*/
#define BWX_EV56_INT8 (0L << 37)
#define BWX_EV56_INT4 (1L << 37)
#define BWX_EV56_INT2 (2L << 37)
#define BWX_EV56_INT1 (3L << 37)
static __inline u_int8_t
ldbu(vm_offset_t va)
{
u_int64_t r;
__asm__ __volatile__ ("ldbu %0,%1" : "=r"(r) : "m"(*(u_int8_t*)va));
return r;
}
static __inline u_int16_t
ldwu(vm_offset_t va)
{
u_int64_t r;
__asm__ __volatile__ ("ldwu %0,%1" : "=r"(r) : "m"(*(u_int16_t*)va));
return r;
}
static __inline u_int32_t
ldl(vm_offset_t va)
{
return *(u_int32_t*) va;
}
static __inline void
stb(vm_offset_t va, u_int64_t r)
{
__asm__ __volatile__ ("stb %1,%0" : "=m"(*(u_int8_t*)va) : "r"(r));
__asm__ __volatile__ ("mb");
}
static __inline void
stw(vm_offset_t va, u_int64_t r)
{
__asm__ __volatile__ ("stw %1,%0" : "=m"(*(u_int16_t*)va) : "r"(r));
__asm__ __volatile__ ("mb");
}
static __inline void
stl(vm_offset_t va, u_int64_t r)
{
__asm__ __volatile__ ("stl %1,%0" : "=m"(*(u_int32_t*)va) : "r"(r));
__asm__ __volatile__ ("mb");
}
static __inline void
stb_nb(vm_offset_t va, u_int64_t r)
{
__asm__ __volatile__ ("stb %1,%0" : "=m"(*(u_int8_t*)va) : "r"(r));
}
static __inline void
stw_nb(vm_offset_t va, u_int64_t r)
{
__asm__ __volatile__ ("stw %1,%0" : "=m"(*(u_int16_t*)va) : "r"(r));
}
static __inline void
stl_nb(vm_offset_t va, u_int64_t r)
{
__asm__ __volatile__ ("stl %1,%0" : "=m"(*(u_int32_t*)va) : "r"(r));
}
#endif /* !_MACHINE_BWX_H_ */