Annotation of sys/arch/i386/isa/icu.s, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: icu.s,v 1.25 2007/05/25 21:27:15 krw Exp $ */
2: /* $NetBSD: icu.s,v 1.45 1996/01/07 03:59:34 mycroft Exp $ */
3:
4: /*-
5: * Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by Charles M. Hannum.
18: * 4. The name of the author may not be used to endorse or promote products
19: * derived from this software without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31: */
32:
33: #include <net/netisr.h>
34:
35: .data
36: .globl _C_LABEL(imen),_C_LABEL(ipending),_C_LABEL(netisr)
37: _C_LABEL(imen):
38: .long 0xffff # interrupt mask enable (all off)
39: _C_LABEL(ipending):
40: .long 0 # interrupts pending
41: _C_LABEL(netisr):
42: .long 0 # scheduling bits for network
43:
44: .text
45: /*
46: * Process pending interrupts.
47: *
48: * Important registers:
49: * ebx - cpl
50: * esi - address to resume loop at
51: * edi - scratch for Xsoftnet
52: */
53: IDTVEC(spllower)
54: pushl %ebx
55: pushl %esi
56: pushl %edi
57: movl CPL,%ebx # save priority
58: movl $1f,%esi # address to resume loop at
59: 1: movl %ebx,%eax # get cpl
60: shrl $4,%eax # find its mask.
61: movl _C_LABEL(iunmask)(,%eax,4),%eax
62: cli
63: andl _C_LABEL(ipending),%eax # any non-masked bits left?
64: jz 2f
65: sti
66: bsfl %eax,%eax
67: btrl %eax,_C_LABEL(ipending)
68: jnc 1b
69: jmp *_C_LABEL(Xrecurse)(,%eax,4)
70: 2: movl %ebx,CPL
71: sti
72: popl %edi
73: popl %esi
74: popl %ebx
75: ret
76:
77: /*
78: * Handle return from interrupt after device handler finishes.
79: *
80: * Important registers:
81: * ebx - cpl to restore
82: * esi - address to resume loop at
83: * edi - scratch for Xsoftnet
84: */
85: IDTVEC(doreti)
86: popl %ebx # get previous priority
87: movl $1f,%esi # address to resume loop at
88: 1: movl %ebx,%eax
89: shrl $4,%eax
90: movl _C_LABEL(iunmask)(,%eax,4),%eax
91: cli
92: andl _C_LABEL(ipending),%eax
93: jz 2f
94: sti
95: bsfl %eax,%eax # slow, but not worth optimizing
96: btrl %eax,_C_LABEL(ipending)
97: jnc 1b # some intr cleared the in-memory bit
98: cli
99: jmp *_C_LABEL(Xresume)(,%eax,4)
100: 2: /* Check for ASTs on exit to user mode. */
101: CHECK_ASTPENDING(%ecx)
102: movl %ebx,CPL
103: je 3f
104: testb $SEL_RPL,TF_CS(%esp)
105: #ifdef VM86
106: jnz 4f
107: testl $PSL_VM,TF_EFLAGS(%esp)
108: #endif
109: jz 3f
110: 4: CLEAR_ASTPENDING(%ecx)
111: sti
112: movl $T_ASTFLT,TF_TRAPNO(%esp) /* XXX undo later. */
113: /* Pushed T_ASTFLT into tf_trapno on entry. */
114: call _C_LABEL(trap)
115: cli
116: jmp 2b
117: 3: INTRFASTEXIT
118:
119:
120: /*
121: * Soft interrupt handlers
122: */
123:
124: #include "pccom.h"
125:
126: IDTVEC(softast)
127: movl $IPL_SOFTAST,%eax
128: movl %eax,CPL
129: sti
130: jmp *%esi
131:
132: IDTVEC(softtty)
133: #if NPCCOM > 0
134: movl $IPL_SOFTTTY,%eax
135: movl %eax,CPL
136: sti
137: #ifdef MULTIPROCESSOR
138: call _C_LABEL(i386_softintlock)
139: #endif
140: call _C_LABEL(comsoft)
141: #ifdef MULTIPROCESSOR
142: call _C_LABEL(i386_softintunlock)
143: #endif
144: #endif
145: jmp *%esi
146:
147: #define DONETISR(s, c) \
148: .globl _C_LABEL(c) ;\
149: testl $(1 << s),%edi ;\
150: jz 1f ;\
151: call _C_LABEL(c) ;\
152: 1:
153:
154: IDTVEC(softnet)
155: movl $IPL_SOFTNET,%eax
156: movl %eax,CPL
157: sti
158: #ifdef MULTIPROCESSOR
159: call _C_LABEL(i386_softintlock)
160: #endif
161: xorl %edi,%edi
162: xchgl _C_LABEL(netisr),%edi
163: #include <net/netisr_dispatch.h>
164: #ifdef MULTIPROCESSOR
165: call _C_LABEL(i386_softintunlock)
166: #endif
167: jmp *%esi
168: #undef DONETISR
169:
170: IDTVEC(softclock)
171: movl $IPL_SOFTCLOCK,%eax
172: movl %eax,CPL
173: sti
174: #ifdef MULTIPROCESSOR
175: call _C_LABEL(i386_softintlock)
176: #endif
177: call _C_LABEL(softclock)
178: #ifdef MULTIPROCESSOR
179: call _C_LABEL(i386_softintunlock)
180: #endif
181: jmp *%esi
182:
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