1*1da177e4SLinus Torvalds/* 2*1da177e4SLinus Torvalds NetWinder Floating Point Emulator 3*1da177e4SLinus Torvalds (c) Rebel.COM, 1998,1999 4*1da177e4SLinus Torvalds 5*1da177e4SLinus Torvalds Direct questions, comments to Scott Bambrough <scottb@netwinder.org> 6*1da177e4SLinus Torvalds 7*1da177e4SLinus Torvalds This program is free software; you can redistribute it and/or modify 8*1da177e4SLinus Torvalds it under the terms of the GNU General Public License as published by 9*1da177e4SLinus Torvalds the Free Software Foundation; either version 2 of the License, or 10*1da177e4SLinus Torvalds (at your option) any later version. 11*1da177e4SLinus Torvalds 12*1da177e4SLinus Torvalds This program is distributed in the hope that it will be useful, 13*1da177e4SLinus Torvalds but WITHOUT ANY WARRANTY; without even the implied warranty of 14*1da177e4SLinus Torvalds MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15*1da177e4SLinus Torvalds GNU General Public License for more details. 16*1da177e4SLinus Torvalds 17*1da177e4SLinus Torvalds You should have received a copy of the GNU General Public License 18*1da177e4SLinus Torvalds along with this program; if not, write to the Free Software 19*1da177e4SLinus Torvalds Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20*1da177e4SLinus Torvalds*/ 21*1da177e4SLinus Torvalds 22*1da177e4SLinus Torvalds#include "fpa11.h" 23*1da177e4SLinus Torvalds 24*1da177e4SLinus Torvalds/* Read and write floating point status register */ 25*1da177e4SLinus Torvaldsextern __inline__ unsigned int readFPSR(void) 26*1da177e4SLinus Torvalds{ 27*1da177e4SLinus Torvalds FPA11 *fpa11 = GET_FPA11(); 28*1da177e4SLinus Torvalds return (fpa11->fpsr); 29*1da177e4SLinus Torvalds} 30*1da177e4SLinus Torvalds 31*1da177e4SLinus Torvaldsextern __inline__ void writeFPSR(FPSR reg) 32*1da177e4SLinus Torvalds{ 33*1da177e4SLinus Torvalds FPA11 *fpa11 = GET_FPA11(); 34*1da177e4SLinus Torvalds /* the sysid byte in the status register is readonly */ 35*1da177e4SLinus Torvalds fpa11->fpsr = (fpa11->fpsr & MASK_SYSID) | (reg & ~MASK_SYSID); 36*1da177e4SLinus Torvalds} 37*1da177e4SLinus Torvalds 38*1da177e4SLinus Torvalds/* Read and write floating point control register */ 39*1da177e4SLinus Torvaldsextern __inline__ FPCR readFPCR(void) 40*1da177e4SLinus Torvalds{ 41*1da177e4SLinus Torvalds FPA11 *fpa11 = GET_FPA11(); 42*1da177e4SLinus Torvalds /* clear SB, AB and DA bits before returning FPCR */ 43*1da177e4SLinus Torvalds return (fpa11->fpcr & ~MASK_RFC); 44*1da177e4SLinus Torvalds} 45*1da177e4SLinus Torvalds 46*1da177e4SLinus Torvaldsextern __inline__ void writeFPCR(FPCR reg) 47*1da177e4SLinus Torvalds{ 48*1da177e4SLinus Torvalds FPA11 *fpa11 = GET_FPA11(); 49*1da177e4SLinus Torvalds fpa11->fpcr &= ~MASK_WFC; /* clear SB, AB and DA bits */ 50*1da177e4SLinus Torvalds fpa11->fpcr |= (reg & MASK_WFC); /* write SB, AB and DA bits */ 51*1da177e4SLinus Torvalds} 52