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/* Copyright (C) 1994 Free Software Foundation, Inc.
Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
On-Line Applications Research Corporation.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* m68020.h
*
* This file contains macros which are used to access MC68020
* registers which are not addressable by C. These are
* useful when developing the board specific support.
*/
#ifndef m68020_h__
#define m68020_h__
typedef void ( *mc68020_isr )( void );
#define disable_intr( level ) \
{ (level) = 0; \
asm volatile ( "movew %%sr,%0 ; \
orw #0x0700,%%sr" \
: "=d" ((level)) : "0" ((level)) ); \
}
#define enable_intr( level ) \
{ asm volatile ( "movew %0,%%sr " \
: "=d" ((level)) : "0" ((level)) ); \
}
#define flash_intr( level ) \
{ asm volatile ( "movew %0,%%sr ; \
orw #0x0700,%%sr" \
: "=d" ((level)) : "0" ((level)) ); \
}
#define get_vbr( vbr ) \
{ (vbr) = 0; \
asm volatile ( "movec %%vbr,%0 " \
: "=a" (vbr) : "0" (vbr) ); \
}
#define set_vbr( vbr ) \
{ register mc68020_isr *_vbr= (mc68020_isr *)(vbr); \
asm volatile ( "movec %0,%%vbr " \
: "=a" (_vbr) : "0" (_vbr) ); \
}
#define enable_caching() \
{ register unsigned int _ctl=0x01; \
asm volatile ( "movec %0,%%cacr" \
: "=d" (_ctl) : "0" (_ctl) ); \
}
#define delay( microseconds ) \
{ register unsigned int _delay=(microseconds); \
register unsigned int _tmp=123; \
asm volatile( "0: \
nbcd %0 ; \
nbcd %0 ; \
dbf %1,0 " \
: "=d" (_tmp), "=d" (_delay) \
: "0" (_tmp), "1" (_delay) ); \
}
#define enable_tracing()
#define cause_intr( X )
#define clear_intr( X )
extern mc68020_isr M68Kvec[]; /* vector table address */
#endif
/* end of include file */
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