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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/* $FreeBSD$ */
/* $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 <sys/syscall.h>
#include <machine/trap.h>
#include <machine/param.h>
#include <machine/pmap.h>
#include <machine/psl.h>
#include <machine/asm.h>
/*
* Some instructions gas doesn't understand (yet?)
*/
#define bdneq bdnzf 2,
/*
* No processes are runnable, so loop waiting for one.
* Separate label here for accounting purposes.
*/
#if 0 /* XXX: I think this is now unneeded. Leaving it in just in case. */
ASENTRY(Idle)
mfmsr 3
andi. 3,3,~PSL_EE@l /* disable interrupts while
manipulating runque */
mtmsr 3
lis 8,sched_whichqs@ha
lwz 9,sched_whichqs@l(8)
or. 9,9,9
bne- .Lsw1 /* at least one queue non-empty */
ori 3,3,PSL_EE@l /* reenable ints again */
mtmsr 3
isync
/* Check if we can use power saving mode */
lis 8,powersave@ha
lwz 9,powersave@l(8)
or. 9,9,9
beq 1f
sync
oris 3,3,PSL_POW@h /* enter power saving mode */
mtmsr 3
isync
1:
b _ASM_LABEL(Idle)
#endif /* XXX */
/*
* switchexit gets called from cpu_exit to complete the exit procedure.
*/
ENTRY(switchexit)
/* First switch to the idle pcb/kernel stack */
#if 0 /* XXX */
lis 6,idle_u@ha
lwz 6,idle_u@l(6)
mfsprg 7,0
stw 6,GD_CURPCB(7)
#endif
addi 1,6,USPACE-16 /* 16 bytes are reserved at stack top */
/*
* Schedule the vmspace and stack to be freed (the proc arg is
* already in r3).
*/
bl sys_exit
/* Fall through to cpu_switch to actually select another proc */
li 3,0 /* indicate exited process */
/*
* void cpu_switch(struct proc *p)
* Find a runnable process and switch to it.
*/
/* XXX noprofile? --thorpej@netbsd.org */
ENTRY(cpu_switch)
mflr 0 /* save lr */
stw 0,4(1)
stwu 1,-16(1)
stw 31,12(1)
stw 30,8(1)
mr 30,3
mfsprg 3,0
xor 31,31,31
stw 31,GD_CURPROC(3) /* Zero to not accumulate cpu time */
mfsprg 3,0
lwz 31,GD_CURPCB(3)
xor 3,3,3
#if 0 /* XXX */
bl lcsplx
#endif
stw 3,PCB_SPL(31) /* save spl */
/* Find a new process */
bl chooseproc
1:
/* record new process */
mfsprg 4,0
stw 3,GD_CURPROC(4)
cmpl 0,31,30 /* is it the same process? */
beq switch_return
or. 30,30,30 /* old process was exiting? */
beq switch_exited
mfsr 10,USER_SR /* save USER_SR for copyin/copyout */
mfcr 11 /* save cr */
mr 12,2 /* save r2 */
stwu 1,-SFRAMELEN(1) /* still running on old stack */
stmw 10,8(1)
lwz 3,P_ADDR(30)
stw 1,PCB_SP(3) /* save SP */
switch_exited:
mfmsr 3
andi. 3,3,~PSL_EE@l /* disable interrupts while
actually switching */
mtmsr 3
/* indicate new pcb */
lwz 4,P_ADDR(31)
mfsprg 5,0
stw 4,GD_CURPCB(5)
#if 0 /* XXX */
/* save real pmap pointer for spill fill */
lwz 5,PCB_PMR(4)
lis 6,curpm@ha
stwu 5,curpm@l(6)
stwcx. 5,0,6 /* clear possible reservation */
#endif
addic. 5,5,64
li 6,0
mfsr 8,KERNEL_SR /* save kernel SR */
1:
addis 6,6,-0x10000000@ha /* set new procs segment registers */
or. 6,6,6 /* This is done from the real
address pmap */
lwzu 7,-4(5) /* so we don't have to worry */
mtsrin 7,6 /* about accessibility */
bne 1b
mtsr KERNEL_SR,8 /* restore kernel SR */
isync
lwz 1,PCB_SP(4) /* get new procs SP */
ori 3,3,PSL_EE@l /* interrupts are okay again */
mtmsr 3
lmw 10,8(1) /* get other regs */
lwz 1,0(1) /* get saved SP */
mr 2,12 /* get saved r2 */
mtcr 11 /* get saved cr */
isync
mtsr USER_SR,10 /* get saved USER_SR */
isync
switch_return:
mr 30,7 /* save proc pointer */
lwz 3,PCB_SPL(4)
#if 0 /* XXX */
bl lcsplx
#endif
mr 3,30 /* get curproc for special fork
returns */
lwz 31,12(1)
lwz 30,8(1)
addi 1,1,16
lwz 0,4(1)
mtlr 0
blr
/*
* Fake savectx for the time being.
*/
ENTRY(savectx)
blr
|
