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/* $OpenBSD: fpu.c,v 1.4 2002/09/15 09:01:59 deraadt Exp $ */
/* $NetBSD: fpu.c,v 1.1 1996/09/30 16:34:44 ws Exp $ */
/*
* Copyright (C) 1996 Wolfgang Solfrank.
* Copyright (C) 1996 TooLs GmbH.
* 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 TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <machine/fpu.h>
#include <machine/psl.h>
void
enable_fpu(p)
struct proc *p;
{
int msr, scratch;
struct pcb *pcb = &p->p_addr->u_pcb;
struct trapframe *tf = trapframe(p);
tf->srr1 |= PSL_FP;
if (!(pcb->pcb_flags & PCB_FPU)) {
bzero(&pcb->pcb_fpu, sizeof pcb->pcb_fpu);
pcb->pcb_flags |= PCB_FPU;
}
asm volatile ("mfmsr %0; ori %1,%0,%2; mtmsr %1; isync"
: "=r"(msr), "=r"(scratch) : "K"(PSL_FP));
asm volatile ("lfd 0,0(%0); mtfsf 0xff,0" :: "b"(&pcb->pcb_fpu.fpcsr));
asm ("lfd 0,0(%0);"
"lfd 1,8(%0);"
"lfd 2,16(%0);"
"lfd 3,24(%0);"
"lfd 4,32(%0);"
"lfd 5,40(%0);"
"lfd 6,48(%0);"
"lfd 7,56(%0);"
"lfd 8,64(%0);"
"lfd 9,72(%0);"
"lfd 10,80(%0);"
"lfd 11,88(%0);"
"lfd 12,96(%0);"
"lfd 13,104(%0);"
"lfd 14,112(%0);"
"lfd 15,120(%0);"
"lfd 16,128(%0);"
"lfd 17,136(%0);"
"lfd 18,144(%0);"
"lfd 19,152(%0);"
"lfd 20,160(%0);"
"lfd 21,168(%0);"
"lfd 22,176(%0);"
"lfd 23,184(%0);"
"lfd 24,192(%0);"
"lfd 25,200(%0);"
"lfd 26,208(%0);"
"lfd 27,216(%0);"
"lfd 28,224(%0);"
"lfd 29,232(%0);"
"lfd 30,240(%0);"
"lfd 31,248(%0)" :: "b"(&pcb->pcb_fpu.fpr[0]));
asm volatile ("mtmsr %0; isync" :: "r"(msr));
}
void
save_fpu(p)
struct proc *p;
{
int msr, scratch;
struct pcb *pcb = &p->p_addr->u_pcb;
asm volatile ("mfmsr %0; ori %1,%0,%2; mtmsr %1; isync"
: "=r"(msr), "=r"(scratch) : "K"(PSL_FP));
asm ("stfd 0,0(%0);"
"stfd 1,8(%0);"
"stfd 2,16(%0);"
"stfd 3,24(%0);"
"stfd 4,32(%0);"
"stfd 5,40(%0);"
"stfd 6,48(%0);"
"stfd 7,56(%0);"
"stfd 8,64(%0);"
"stfd 9,72(%0);"
"stfd 10,80(%0);"
"stfd 11,88(%0);"
"stfd 12,96(%0);"
"stfd 13,104(%0);"
"stfd 14,112(%0);"
"stfd 15,120(%0);"
"stfd 16,128(%0);"
"stfd 17,136(%0);"
"stfd 18,144(%0);"
"stfd 19,152(%0);"
"stfd 20,160(%0);"
"stfd 21,168(%0);"
"stfd 22,176(%0);"
"stfd 23,184(%0);"
"stfd 24,192(%0);"
"stfd 25,200(%0);"
"stfd 26,208(%0);"
"stfd 27,216(%0);"
"stfd 28,224(%0);"
"stfd 29,232(%0);"
"stfd 30,240(%0);"
"stfd 31,248(%0)" :: "b"(&pcb->pcb_fpu.fpr[0]));
asm volatile ("mffs 0; stfd 0,0(%0)" :: "b"(&pcb->pcb_fpu.fpcsr));
asm volatile ("mtmsr %0; isync" :: "r"(msr));
}
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