52 lines
1.6 KiB
Text
52 lines
1.6 KiB
Text
|
/*
|
||
|
|
NetWinder Floating Point Emulator
|
||
|
|
(c) Rebel.COM, 1998,1999
|
||
|
|
|
||
|
|
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
|
||
|
|
|
||
|
|
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; either version 2 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program; if not, write to the Free Software
|
||
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "fpa11.h"
|
||
|
|
|
||
|
|
/* Read and write floating point status register */
|
||
|
|
static inline unsigned int readFPSR(void)
|
||
|
|
{
|
||
|
|
FPA11 *fpa11 = GET_FPA11();
|
||
|
|
return (fpa11->fpsr);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void writeFPSR(FPSR reg)
|
||
|
|
{
|
||
|
|
FPA11 *fpa11 = GET_FPA11();
|
||
|
|
/* the sysid byte in the status register is readonly */
|
||
|
|
fpa11->fpsr = (fpa11->fpsr & MASK_SYSID) | (reg & ~MASK_SYSID);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Read and write floating point control register */
|
||
|
|
static inline FPCR readFPCR(void)
|
||
|
|
{
|
||
|
|
FPA11 *fpa11 = GET_FPA11();
|
||
|
|
/* clear SB, AB and DA bits before returning FPCR */
|
||
|
|
return (fpa11->fpcr & ~MASK_RFC);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void writeFPCR(FPCR reg)
|
||
|
|
{
|
||
|
|
FPA11 *fpa11 = GET_FPA11();
|
||
|
|
fpa11->fpcr &= ~MASK_WFC; /* clear SB, AB and DA bits */
|
||
|
|
fpa11->fpcr |= (reg & MASK_WFC); /* write SB, AB and DA bits */
|
||
|
|
}
|