/*- * Copyright (c) 1990 William Jolitz. * Copyright (c) 1991, 1993 * The Regents of the University of California. 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)npx.c 8.1 (Berkeley) 6/11/93 */ #include "npx.h" #if NNPX > 0 #include <sys/param.h> #include <sys/systm.h> #include <sys/conf.h> #include <sys/file.h> #include <sys/proc.h> #include <sys/user.h> #include <sys/ioctl.h> #include <machine/cpu.h> #include <machine/trap.h> #include <machine/specialreg.h> #include <i386/isa/isa_device.h> #include <i386/isa/icu.h> /* * 387 and 287 Numeric Coprocessor Extension (NPX) Driver. */ int npxprobe(), npxattach(), npxintr(); struct isa_driver npxdriver = { npxprobe, npxattach, "npx", }; struct proc *npxproc; /* process who owns device, otherwise zero */ struct pcb *npxpcb; /* owners context structure */ static npxexists; extern long npx0mask; /* * Probe routine - look device, otherwise set emulator bit */ npxprobe(dvp) struct isa_device *dvp; { static status, control; #ifdef lint npxintr(); #endif /* insure EM bit off */ load_cr0(rcr0() & ~CR0_EM); asm(" fninit "); /* put device in known state */ /* check for a proper status of zero */ status = 0xa5a5; asm (" fnstsw %0 " : "=m" (status) : "m" (status) ); if (status == 0) { /* good, now check for a proper control word */ control = 0xa5a5; asm (" fnstcw %0 " : "=m" (control) : "m" (control)); if ((control&0x103f) == 0x3f) { /* then we have a numeric coprocessor */ /* XXX should force an exception here to generate an intr */ return (1); } } /* insure EM bit on */ load_cr0(rcr0() | CR0_EM); return (0); } /* * Attach routine - announce which it is, and wire into system */ npxattach(dvp) struct isa_device *dvp; { npxinit(0x262); /* check for ET bit to decide 387/287 */ npxexists++; npx0mask = dvp->id_irq; } /* * Initialize floating point unit, usually after an error */ npxinit(control) { if (npxexists == 0) return; load_cr0(rcr0() & ~CR0_EM); /* stop emulating */ #ifdef INTEL_COMPAT asm (" finit"); asm(" fldcw %0" : : "g" (control)); asm(" fnsave %0 " : : "g" (curpcb->pcb_savefpu) ); #else asm("fninit"); asm(" fnsave %0 " : : "g" (curpcb->pcb_savefpu) ); #endif load_cr0(rcr0() | CR0_EM); /* start emulating */ } /* * Record information needed in processing an exception and clear status word */ npxintr(frame) struct intrframe frame; { if (npxexists == 0) { printf ("stray npxintr\n"); return; } outb(0xf0,0); /* reset coprocessor */ /* * npxproc may be NULL, if this is a delayed interrupt from * a process that just exited. */ if (npxproc) { /* * sync state in process context structure, in advance * of debugger/process looking for it. */ asm("fnsave %0" :: "g" (npxproc->p_addr->u_pcb.pcb_savefpu)); psignal(npxproc, SIGFPE); /* clear the exception so we can catch others like it */ asm (" fnclex"); } } /* * Implement device not available (DNA) exception */ npxdna() { if (npxexists == 0) return(0); load_cr0(rcr0() & ~CR0_EM); /* stop emulating */ if (npxproc != curproc) { if (npxproc) asm(" fnsave %0 "::"g" (npxproc->p_addr->u_pcb.pcb_savefpu)); asm(" frstor %0 " : : "g" (curpcb->pcb_savefpu)); npxproc = curproc; } return (1); } #endif