2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (C) 1996 Wolfgang Solfrank.
5 * Copyright (C) 1996 TooLs GmbH.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $NetBSD: fpu.c,v 1.5 2001/07/22 11:29:46 wiz Exp $
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/limits.h>
44 #include <machine/altivec.h>
45 #include <machine/pcb.h>
46 #include <machine/psl.h>
49 save_vec_int(struct thread *td)
57 * Temporarily re-enable the vector unit during the save
64 * Save the vector registers and VSCR to the PCB
66 #define STVX(n) __asm ("stvx %1,0,%0" \
67 :: "b"(pcb->pcb_vec.vr[n]), "n"(n));
68 STVX(0); STVX(1); STVX(2); STVX(3);
69 STVX(4); STVX(5); STVX(6); STVX(7);
70 STVX(8); STVX(9); STVX(10); STVX(11);
71 STVX(12); STVX(13); STVX(14); STVX(15);
72 STVX(16); STVX(17); STVX(18); STVX(19);
73 STVX(20); STVX(21); STVX(22); STVX(23);
74 STVX(24); STVX(25); STVX(26); STVX(27);
75 STVX(28); STVX(29); STVX(30); STVX(31);
78 __asm __volatile("mfvscr 0; stvewx 0,0,%0" :: "b"(&pcb->pcb_vec.vscr));
81 * Disable vector unit again
89 enable_vec(struct thread *td)
99 * Save the thread's Altivec CPU number, and set the CPU's current
102 td->td_pcb->pcb_veccpu = PCPU_GET(cpuid);
103 PCPU_SET(vecthread, td);
106 * Enable the vector unit for when the thread returns from the
107 * exception. If this is the first time the unit has been used by
108 * the thread, initialise the vector registers and VSCR to 0, and
109 * set the flag to indicate that the vector unit is in use.
112 if (!(pcb->pcb_flags & PCB_VEC)) {
113 memset(&pcb->pcb_vec, 0, sizeof pcb->pcb_vec);
114 pcb->pcb_flags |= PCB_VEC;
118 * Temporarily enable the vector unit so the registers
122 mtmsr(msr | PSL_VEC);
126 * Restore VSCR by first loading it into a vector and then into VSCR.
127 * (this needs to done before loading the user's vector registers
128 * since we need to use a scratch vector register)
130 __asm __volatile("vxor 0,0,0; lvewx 0,0,%0; mtvscr 0" \
131 :: "b"(&pcb->pcb_vec.vscr));
133 #define LVX(n) __asm ("lvx " #n ",0,%0" \
134 :: "b"(&pcb->pcb_vec.vr[n]));
135 LVX(0); LVX(1); LVX(2); LVX(3);
136 LVX(4); LVX(5); LVX(6); LVX(7);
137 LVX(8); LVX(9); LVX(10); LVX(11);
138 LVX(12); LVX(13); LVX(14); LVX(15);
139 LVX(16); LVX(17); LVX(18); LVX(19);
140 LVX(20); LVX(21); LVX(22); LVX(23);
141 LVX(24); LVX(25); LVX(26); LVX(27);
142 LVX(28); LVX(29); LVX(30); LVX(31);
150 save_vec(struct thread *td)
159 * Clear the current vec thread and pcb's CPU id
160 * XXX should this be left clear to allow lazy save/restore ?
162 pcb->pcb_veccpu = INT_MAX;
163 PCPU_SET(vecthread, NULL);
167 * Save altivec state without dropping ownership. This will only save state if
168 * the current vector-thread is `td'.
171 save_vec_nodrop(struct thread *td)
175 vtd = PCPU_GET(vecthread);