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
|
/*
* Copyright (c) 1995 Shantanu Goel
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*/
/*
* spl routines for the i386at.
*/
#include <mach/machine/asm.h>
#include <i386/ipl.h>
#include <i386/pic.h>
#include <i386/i386asm.h>
#include <i386/xen.h>
/*
* Set IPL to the specified value.
*
* NOTE: Normally we would not have to enable interrupts
* here. Linux drivers, however, use cli()/sti(), so we must
* guard against the case where a Mach routine which
* has done an spl() calls a Linux routine that returns
* with interrupts disabled. A subsequent splx() can,
* potentially, return with interrupts disabled.
*/
#define SETIPL(level) \
movl $(level),%edx; \
cmpl EXT(curr_ipl),%edx; \
jne spl; \
sti; \
movl %edx,%eax; \
ret
/*
* Program PICs with mask in %eax.
*/
#ifndef MACH_XEN
#define SETMASK() \
cmpl EXT(curr_pic_mask),%eax; \
je 9f; \
outb %al,$(PIC_MASTER_OCW); \
movl %eax,EXT(curr_pic_mask); \
movb %ah,%al; \
outb %al,$(PIC_SLAVE_OCW); \
9:
#else /* MACH_XEN */
#define pic_mask int_mask
#define SETMASK() \
pushl %ebx; \
movl %eax,%ebx; \
xchgl %eax,hyp_shared_info+EVTMASK; \
notl %ebx; \
andl %eax,%ebx; /* Get unmasked events */ \
testl hyp_shared_info+PENDING, %ebx; \
popl %ebx; \
jz 9f; /* Check whether there was some pending */ \
lock orl $1,hyp_shared_info+CPU_PENDING_SEL; /* Yes, activate it */ \
movb $1,hyp_shared_info+CPU_PENDING; \
9:
#endif /* MACH_XEN */
ENTRY(spl0)
movl EXT(curr_ipl),%eax /* save current ipl */
pushl %eax
cli /* disable interrupts */
#ifdef LINUX_DEV
movl EXT(bh_active),%eax
/* get pending mask */
andl EXT(bh_mask),%eax /* any pending unmasked interrupts? */
jz 1f /* no, skip */
call EXT(spl1) /* block further interrupts */
incl EXT(intr_count) /* set interrupt flag */
call EXT(linux_soft_intr) /* go handle interrupt */
decl EXT(intr_count) /* decrement interrupt flag */
cli /* disable interrupts */
1:
#endif
cmpl $0,softclkpending /* softclock pending? */
je 1f /* no, skip */
movl $0,softclkpending /* clear flag */
call EXT(spl1) /* block further interrupts */
#ifdef LINUX_DEV
incl EXT(intr_count) /* set interrupt flag */
#endif
call EXT(softclock) /* go handle interrupt */
#ifdef LINUX_DEV
decl EXT(intr_count) /* decrement interrupt flag */
#endif
cli /* disable interrupts */
1:
cmpl $(SPL0),EXT(curr_ipl) /* are we at spl0? */
je 1f /* yes, all done */
movl $(SPL0),EXT(curr_ipl) /* set ipl */
movl EXT(pic_mask)+SPL0*4,%eax
/* get PIC mask */
SETMASK() /* program PICs with new mask */
1:
sti /* enable interrupts */
popl %eax /* return previous mask */
ret
Entry(splsoftclock)
ENTRY(spl1)
SETIPL(SPL1)
ENTRY(spl2)
SETIPL(SPL2)
ENTRY(spl3)
SETIPL(SPL3)
Entry(splnet)
Entry(splhdw)
ENTRY(spl4)
SETIPL(SPL4)
Entry(splbio)
Entry(spldcm)
ENTRY(spl5)
SETIPL(SPL5)
Entry(spltty)
Entry(splimp)
Entry(splvm)
ENTRY(spl6)
SETIPL(SPL6)
Entry(splclock)
Entry(splsched)
Entry(splhigh)
Entry(splhi)
ENTRY(spl7)
SETIPL(SPL7)
ENTRY(splx)
movl 4(%esp),%edx /* get ipl */
testl %edx,%edx /* spl0? */
jz EXT(spl0) /* yes, handle specially */
cmpl EXT(curr_ipl),%edx /* same ipl as current? */
jne spl /* no */
sti /* ensure interrupts are enabled */
movl %edx,%eax /* return previous ipl */
ret
/*
* Like splx() but returns with interrupts disabled and does
* not return the previous ipl. This should only be called
* when returning from an interrupt.
*/
.align TEXT_ALIGN
.globl splx_cli
splx_cli:
movl 4(%esp),%edx /* get ipl */
cli /* disable interrupts */
testl %edx,%edx /* spl0? */
jnz 2f /* no, skip */
#ifdef LINUX_DEV
movl EXT(bh_active),%eax
/* get pending mask */
andl EXT(bh_mask),%eax /* any pending unmasked interrupts? */
jz 1f /* no, skip */
call EXT(spl1) /* block further interrupts */
incl EXT(intr_count) /* set interrupt flag */
call EXT(linux_soft_intr) /* go handle interrupt */
decl EXT(intr_count) /* decrement interrupt flag */
cli /* disable interrupts */
1:
#endif
cmpl $0,softclkpending /* softclock pending? */
je 1f /* no, skip */
movl $0,softclkpending /* clear flag */
call EXT(spl1) /* block further interrupts */
#ifdef LINUX_DEV
incl EXT(intr_count) /* set interrupt flag */
#endif
call EXT(softclock) /* go handle interrupt */
#ifdef LINUX_DEV
decl EXT(intr_count) /* decrement interrupt flag */
#endif
cli /* disable interrupts */
1:
xorl %edx,%edx /* edx = ipl 0 */
2:
cmpl EXT(curr_ipl),%edx /* same ipl as current? */
je 1f /* yes, all done */
movl %edx,EXT(curr_ipl) /* set ipl */
movl EXT(pic_mask)(,%edx,4),%eax
/* get PIC mask */
SETMASK() /* program PICs with new mask */
1:
ret
/*
* NOTE: This routine must *not* use %ecx, otherwise
* the interrupt code will break.
*/
.align TEXT_ALIGN
.globl spl
spl:
movl EXT(pic_mask)(,%edx,4),%eax
/* get PIC mask */
cli /* disable interrupts */
xchgl EXT(curr_ipl),%edx /* set ipl */
SETMASK() /* program PICs with new mask */
sti /* enable interrupts */
movl %edx,%eax /* return previous ipl */
ret
ENTRY(sploff)
pushfl
popl %eax
cli
ret
ENTRY(splon)
pushl 4(%esp)
popfl
ret
.data
.align DATA_ALIGN
softclkpending:
.long 0
.text
ENTRY(setsoftclock)
incl softclkpending
ret
|
