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/*-
* Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#include <machine/tstate.h>
void
fp_init_proc(struct pcb *pcb)
{
bzero(&pcb->pcb_fpstate.fp_fb, sizeof(pcb->pcb_fpstate.fp_fb));
pcb->pcb_fpstate.fp_fsr = 0;
wr(fprs, 0, 0);
}
int
fp_enable_proc(struct proc *p)
{
struct pcb *pcb;
pcb = &p->p_addr->u_pcb;
if ((p->p_frame->tf_tstate & TSTATE_PEF) != 0 &&
(pcb->pcb_fpstate.fp_fprs & FPRS_FEF) == 0) {
/*
* Enable FEF for now. The SCD mandates that this should be
* done when no user trap is set. User traps are not currently
* supported...
*/
wr(fprs, rd(fprs), FPRS_FEF);
return (1);
}
if ((p->p_frame->tf_tstate & TSTATE_PEF) != 0)
return (0);
mtx_lock_spin(&sched_lock);
p->p_frame->tf_tstate |= TSTATE_PEF;
/* Actually load the FP state into the registers. */
restorefpctx(&pcb->pcb_fpstate);
mtx_unlock_spin(&sched_lock);
return (1);
}
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