1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/* $FreeBSD$ */
/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
/*-
* Copyright (C) 2001 Benno Rice
* 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 Benno Rice ``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.
*/
/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 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.
*/
#include "assym.s"
#include "opt_sched.h"
#include <sys/syscall.h>
#include <machine/trap.h>
#include <machine/param.h>
#include <machine/asm.h>
/*
* void cpu_throw(struct thread *old, struct thread *new)
*/
ENTRY(cpu_throw)
mr %r15, %r4
b cpu_switchin
/*
* void cpu_switch(struct thread *old,
* struct thread *new,
* struct mutex *mtx);
*
* Switch to a new thread saving the current state in the old thread.
*/
ENTRY(cpu_switch)
lwz %r6,TD_PCB(%r3) /* Get the old thread's PCB ptr */
stmw %r12,PCB_CONTEXT(%r6) /* Save the non-volatile GP regs.
These can now be used for scratch */
mfcr %r16 /* Save the condition register */
stw %r16,PCB_CR(%r6)
mflr %r16 /* Save the link register */
stw %r16,PCB_LR(%r6)
mfsr %r16,USER_SR /* Save USER_SR for copyin/out */
isync
stw %r16,PCB_AIM_USR_VSID(%r6)
stw %r1,PCB_SP(%r6) /* Save the stack pointer */
stw %r2,PCB_TOC(%r6) /* Save the TOC pointer */
mr %r14,%r3 /* Copy the old thread ptr... */
mr %r15,%r4 /* and the new thread ptr in scratch */
mr %r16,%r5 /* and the new lock */
mr %r17,%r6 /* and the PCB */
lwz %r7,PCB_FLAGS(%r17)
/* Save FPU context if needed */
andi. %r7, %r7, PCB_FPU
beq .L1
bl save_fpu
.L1:
mr %r3,%r14 /* restore old thread ptr */
lwz %r7,PCB_FLAGS(%r17)
/* Save Altivec context if needed */
andi. %r7, %r7, PCB_VEC
beq .L2
bl save_vec
.L2:
mr %r3,%r14 /* restore old thread ptr */
bl pmap_deactivate /* Deactivate the current pmap */
stw %r16,TD_LOCK(%r14) /* ULE: update old thread's lock */
cpu_switchin:
#if defined(SMP) && defined(SCHED_ULE)
/* Wait for the new thread to become unblocked */
lis %r6,blocked_lock@ha
addi %r6,%r6,blocked_lock@l
blocked_loop:
lwz %r7,TD_LOCK(%r15)
cmpw %r6,%r7
beq blocked_loop
#endif
mfsprg %r7,0 /* Get the pcpu pointer */
stw %r15,PC_CURTHREAD(%r7) /* Store new current thread */
lwz %r17,TD_PCB(%r15) /* Store new current PCB */
stw %r17,PC_CURPCB(%r7)
mr %r3,%r15 /* Get new thread ptr */
bl pmap_activate /* Activate the new address space */
lwz %r6, PCB_FLAGS(%r17)
/* Restore FPU context if needed */
andi. %r6, %r6, PCB_FPU
beq .L3
mr %r3,%r15 /* Pass curthread to enable_fpu */
bl enable_fpu
.L3:
lwz %r6, PCB_FLAGS(%r17)
/* Restore Altivec context if needed */
andi. %r6, %r6, PCB_VEC
beq .L4
mr %r3,%r15 /* Pass curthread to enable_vec */
bl enable_vec
/* thread to restore is in r3 */
.L4:
mr %r3,%r17 /* Recover PCB ptr */
lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */
lwz %r5,PCB_CR(%r3) /* Load the condition register */
mtcr %r5
lwz %r5,PCB_LR(%r3) /* Load the link register */
mtlr %r5
lwz %r5,PCB_AIM_USR_VSID(%r3) /* Load the USER_SR segment reg */
mtsr USER_SR,%r5
isync
lwz %r1,PCB_SP(%r3) /* Load the stack pointer */
lwz %r2,PCB_TOC(%r3) /* Load the TOC pointer */
/*
* Perform a dummy stwcx. to clear any reservations we may have
* inherited from the previous thread. It doesn't matter if the
* stwcx succeeds or not. pcb_context[0] can be clobbered.
*/
stwcx. %r1, 0, %r3
blr
/*
* savectx(pcb)
* Update pcb, saving current processor state
*/
ENTRY(savectx)
stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
mfcr %r4 /* Save the condition register */
stw %r4,PCB_CR(%r3)
blr
/*
* fork_trampoline()
* Set up the return from cpu_fork()
*/
ENTRY(fork_trampoline)
lwz %r3,CF_FUNC(%r1)
lwz %r4,CF_ARG0(%r1)
lwz %r5,CF_ARG1(%r1)
bl fork_exit
addi %r1,%r1,CF_SIZE-FSP /* Allow 8 bytes in front of
trapframe to simulate FRAME_SETUP
does when allocating space for
a frame pointer/saved LR */
b trapexit
|