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/*-
* 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.
*
* $NetBSD: fpu.c,v 1.5 2001/07/22 11:29:46 wiz Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/limits.h>
#include <machine/altivec.h>
#include <machine/pcb.h>
#include <machine/psl.h>
static void
save_vec_int(struct thread *td)
{
int msr;
struct pcb *pcb;
pcb = td->td_pcb;
/*
* Temporarily re-enable the vector unit during the save
*/
msr = mfmsr();
mtmsr(msr | PSL_VEC);
isync();
/*
* Save the vector registers and VSCR to the PCB
*/
#define STVX(n) __asm ("stvx %1,0,%0" \
:: "b"(pcb->pcb_vec.vr[n]), "n"(n));
STVX(0); STVX(1); STVX(2); STVX(3);
STVX(4); STVX(5); STVX(6); STVX(7);
STVX(8); STVX(9); STVX(10); STVX(11);
STVX(12); STVX(13); STVX(14); STVX(15);
STVX(16); STVX(17); STVX(18); STVX(19);
STVX(20); STVX(21); STVX(22); STVX(23);
STVX(24); STVX(25); STVX(26); STVX(27);
STVX(28); STVX(29); STVX(30); STVX(31);
#undef STVX
__asm __volatile("mfvscr 0; stvewx 0,0,%0" :: "b"(&pcb->pcb_vec.vscr));
/*
* Disable vector unit again
*/
isync();
mtmsr(msr);
}
void
enable_vec(struct thread *td)
{
int msr;
struct pcb *pcb;
struct trapframe *tf;
pcb = td->td_pcb;
tf = trapframe(td);
/*
* Save the thread's Altivec CPU number, and set the CPU's current
* vector thread
*/
td->td_pcb->pcb_veccpu = PCPU_GET(cpuid);
PCPU_SET(vecthread, td);
/*
* Enable the vector unit for when the thread returns from the
* exception. If this is the first time the unit has been used by
* the thread, initialise the vector registers and VSCR to 0, and
* set the flag to indicate that the vector unit is in use.
*/
tf->srr1 |= PSL_VEC;
if (!(pcb->pcb_flags & PCB_VEC)) {
memset(&pcb->pcb_vec, 0, sizeof pcb->pcb_vec);
pcb->pcb_flags |= PCB_VEC;
}
/*
* Temporarily enable the vector unit so the registers
* can be restored.
*/
msr = mfmsr();
mtmsr(msr | PSL_VEC);
isync();
/*
* Restore VSCR by first loading it into a vector and then into VSCR.
* (this needs to done before loading the user's vector registers
* since we need to use a scratch vector register)
*/
__asm __volatile("vxor 0,0,0; lvewx 0,0,%0; mtvscr 0" \
:: "b"(&pcb->pcb_vec.vscr));
#define LVX(n) __asm ("lvx " #n ",0,%0" \
:: "b"(&pcb->pcb_vec.vr[n]));
LVX(0); LVX(1); LVX(2); LVX(3);
LVX(4); LVX(5); LVX(6); LVX(7);
LVX(8); LVX(9); LVX(10); LVX(11);
LVX(12); LVX(13); LVX(14); LVX(15);
LVX(16); LVX(17); LVX(18); LVX(19);
LVX(20); LVX(21); LVX(22); LVX(23);
LVX(24); LVX(25); LVX(26); LVX(27);
LVX(28); LVX(29); LVX(30); LVX(31);
#undef LVX
isync();
mtmsr(msr);
}
void
save_vec(struct thread *td)
{
struct pcb *pcb;
pcb = td->td_pcb;
save_vec_int(td);
/*
* Clear the current vec thread and pcb's CPU id
* XXX should this be left clear to allow lazy save/restore ?
*/
pcb->pcb_veccpu = INT_MAX;
PCPU_SET(vecthread, NULL);
}
/*
* Save altivec state without dropping ownership. This will only save state if
* the current vector-thread is `td'.
*/
void
save_vec_nodrop(struct thread *td)
{
struct thread *vtd;
vtd = PCPU_GET(vecthread);
if (td != vtd) {
return;
}
save_vec_int(td);
}
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