180 lines
4.8 KiB
C
180 lines
4.8 KiB
C
/*-
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* Copyright (C) 1996 Wolfgang Solfrank.
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* Copyright (C) 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: fpu.c,v 1.5 2001/07/22 11:29:46 wiz Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/limits.h>
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#include <machine/altivec.h>
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#include <machine/pcb.h>
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#include <machine/psl.h>
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static void
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save_vec_int(struct thread *td)
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{
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int msr;
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struct pcb *pcb;
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pcb = td->td_pcb;
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/*
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* Temporarily re-enable the vector unit during the save
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*/
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msr = mfmsr();
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mtmsr(msr | PSL_VEC);
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isync();
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/*
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* Save the vector registers and VSCR to the PCB
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*/
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#define STVX(n) __asm ("stvx %1,0,%0" \
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:: "b"(pcb->pcb_vec.vr[n]), "n"(n));
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STVX(0); STVX(1); STVX(2); STVX(3);
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STVX(4); STVX(5); STVX(6); STVX(7);
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STVX(8); STVX(9); STVX(10); STVX(11);
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STVX(12); STVX(13); STVX(14); STVX(15);
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STVX(16); STVX(17); STVX(18); STVX(19);
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STVX(20); STVX(21); STVX(22); STVX(23);
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STVX(24); STVX(25); STVX(26); STVX(27);
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STVX(28); STVX(29); STVX(30); STVX(31);
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#undef STVX
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__asm __volatile("mfvscr 0; stvewx 0,0,%0" :: "b"(&pcb->pcb_vec.vscr));
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/*
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* Disable vector unit again
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*/
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isync();
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mtmsr(msr);
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}
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void
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enable_vec(struct thread *td)
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{
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int msr;
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struct pcb *pcb;
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struct trapframe *tf;
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pcb = td->td_pcb;
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tf = trapframe(td);
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/*
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* Save the thread's Altivec CPU number, and set the CPU's current
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* vector thread
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*/
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td->td_pcb->pcb_veccpu = PCPU_GET(cpuid);
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PCPU_SET(vecthread, td);
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/*
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* Enable the vector unit for when the thread returns from the
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* exception. If this is the first time the unit has been used by
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* the thread, initialise the vector registers and VSCR to 0, and
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* set the flag to indicate that the vector unit is in use.
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*/
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tf->srr1 |= PSL_VEC;
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if (!(pcb->pcb_flags & PCB_VEC)) {
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memset(&pcb->pcb_vec, 0, sizeof pcb->pcb_vec);
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pcb->pcb_flags |= PCB_VEC;
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}
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/*
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* Temporarily enable the vector unit so the registers
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* can be restored.
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*/
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msr = mfmsr();
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mtmsr(msr | PSL_VEC);
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isync();
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/*
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* Restore VSCR by first loading it into a vector and then into VSCR.
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* (this needs to done before loading the user's vector registers
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* since we need to use a scratch vector register)
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*/
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__asm __volatile("vxor 0,0,0; lvewx 0,0,%0; mtvscr 0" \
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:: "b"(&pcb->pcb_vec.vscr));
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#define LVX(n) __asm ("lvx " #n ",0,%0" \
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:: "b"(&pcb->pcb_vec.vr[n]));
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LVX(0); LVX(1); LVX(2); LVX(3);
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LVX(4); LVX(5); LVX(6); LVX(7);
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LVX(8); LVX(9); LVX(10); LVX(11);
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LVX(12); LVX(13); LVX(14); LVX(15);
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LVX(16); LVX(17); LVX(18); LVX(19);
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LVX(20); LVX(21); LVX(22); LVX(23);
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LVX(24); LVX(25); LVX(26); LVX(27);
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LVX(28); LVX(29); LVX(30); LVX(31);
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#undef LVX
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isync();
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mtmsr(msr);
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}
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void
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save_vec(struct thread *td)
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{
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struct pcb *pcb;
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pcb = td->td_pcb;
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save_vec_int(td);
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/*
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* Clear the current vec thread and pcb's CPU id
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* XXX should this be left clear to allow lazy save/restore ?
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*/
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pcb->pcb_veccpu = INT_MAX;
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PCPU_SET(vecthread, NULL);
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}
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/*
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* Save altivec state without dropping ownership. This will only save state if
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* the current vector-thread is `td'.
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*/
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void
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save_vec_nodrop(struct thread *td)
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{
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struct thread *vtd;
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vtd = PCPU_GET(vecthread);
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if (td != vtd) {
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return;
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}
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save_vec_int(td);
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}
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