1/*- 2 * Copyright (C) 1996 Wolfgang Solfrank. 3 * Copyright (C) 1996 TooLs GmbH. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by TooLs GmbH. 17 * 4. The name of TooLs GmbH may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $NetBSD: fpu.c,v 1.5 2001/07/22 11:29:46 wiz Exp $ 32 */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD$"); 36 37#include <sys/param.h> 38#include <sys/proc.h> 39#include <sys/systm.h> 40#include <sys/limits.h> 41 42#include <machine/altivec.h> 43#include <machine/pcb.h> 44#include <machine/psl.h> 45 46void 47enable_vec(struct thread *td) 48{ 49 int msr; 50 struct pcb *pcb; 51 struct trapframe *tf; 52 53 pcb = td->td_pcb; 54 tf = trapframe(td); 55 56 /* 57 * Save the thread's Altivec CPU number, and set the CPU's current 58 * vector thread 59 */ 60 td->td_pcb->pcb_veccpu = PCPU_GET(cpuid); 61 PCPU_SET(vecthread, td); 62 63 /* 64 * Enable the vector unit for when the thread returns from the 65 * exception. If this is the first time the unit has been used by 66 * the thread, initialise the vector registers and VSCR to 0, and 67 * set the flag to indicate that the vector unit is in use. 68 */ 69 tf->srr1 |= PSL_VEC; 70 if (!(pcb->pcb_flags & PCB_VEC)) { 71 memset(&pcb->pcb_vec, 0, sizeof pcb->pcb_vec); 72 pcb->pcb_flags |= PCB_VEC; 73 } 74 75 /* 76 * Temporarily enable the vector unit so the registers 77 * can be restored. 78 */ 79 msr = mfmsr(); 80 mtmsr(msr | PSL_VEC); 81 isync(); 82 83 /* 84 * Restore VSCR by first loading it into a vector and then into VSCR. 85 * (this needs to done before loading the user's vector registers 86 * since we need to use a scratch vector register) 87 */ 88 __asm __volatile("vxor 0,0,0; lvewx 0,0,%0; mtvscr 0" \ 89 :: "b"(&pcb->pcb_vec.vscr)); 90 91#define LVX(n) __asm ("lvx " #n ",0,%0" \ 92 :: "b"(&pcb->pcb_vec.vr[n])); 93 LVX(0); LVX(1); LVX(2); LVX(3); 94 LVX(4); LVX(5); LVX(6); LVX(7); 95 LVX(8); LVX(9); LVX(10); LVX(11); 96 LVX(12); LVX(13); LVX(14); LVX(15); 97 LVX(16); LVX(17); LVX(18); LVX(19); 98 LVX(20); LVX(21); LVX(22); LVX(23); 99 LVX(24); LVX(25); LVX(26); LVX(27); 100 LVX(28); LVX(29); LVX(30); LVX(31); 101#undef LVX 102 103 isync(); 104 mtmsr(msr); 105} 106 107void 108save_vec(struct thread *td) 109{ 110 int msr; 111 struct pcb *pcb; 112 113 pcb = td->td_pcb; 114 115 /* 116 * Temporarily re-enable the vector unit during the save 117 */ 118 msr = mfmsr(); 119 mtmsr(msr | PSL_VEC); 120 isync(); 121 122 /* 123 * Save the vector registers and VSCR to the PCB 124 */ 125#define STVX(n) __asm ("stvx %1,0,%0" \ 126 :: "b"(pcb->pcb_vec.vr[n]), "n"(n)); 127 STVX(0); STVX(1); STVX(2); STVX(3); 128 STVX(4); STVX(5); STVX(6); STVX(7); 129 STVX(8); STVX(9); STVX(10); STVX(11); 130 STVX(12); STVX(13); STVX(14); STVX(15); 131 STVX(16); STVX(17); STVX(18); STVX(19); 132 STVX(20); STVX(21); STVX(22); STVX(23); 133 STVX(24); STVX(25); STVX(26); STVX(27); 134 STVX(28); STVX(29); STVX(30); STVX(31); 135#undef STVX 136 137 __asm __volatile("mfvscr 0; stvewx 0,0,%0" :: "b"(&pcb->pcb_vec.vscr)); 138 139 /* 140 * Disable vector unit again 141 */ 142 isync(); 143 mtmsr(msr); 144 145 /* 146 * Clear the current vec thread and pcb's CPU id 147 * XXX should this be left clear to allow lazy save/restore ? 148 */ 149 pcb->pcb_veccpu = INT_MAX; 150 PCPU_SET(vecthread, NULL); 151} 152 153