1 /* $OpenBSD: fpc_csr.c,v 1.1 2010/09/24 13:54:06 miod Exp $ */ 2 3 /* 4 * Copyright (c) 2010 Miodrag Vallat. 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * IRIX-compatible get_fpc_csr() and set_fpc_csr() functions 21 */ 22 23 #include <sys/types.h> 24 #include <machine/fpu.h> 25 26 int 27 get_fpc_csr() 28 { 29 int32_t csr; 30 31 __asm__("cfc1 %0,$31" : "=r" (csr)); 32 return csr; 33 } 34 35 int 36 set_fpc_csr(int csr) 37 { 38 int32_t oldcsr; 39 40 __asm__("cfc1 %0,$31" : "=r" (oldcsr)); 41 __asm__("ctc1 %0,$31" :: "r" (csr)); 42 43 return oldcsr; 44 } 45