2 * Copyright (c) 1989, 1990 William F. Jolitz.
3 * Copyright (c) 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * $FreeBSD: src/sys/i386/isa/ipl.s,v 1.32.2.3 2002/05/16 16:03:56 bde Exp $
40 * $DragonFly: src/sys/i386/isa/Attic/ipl.s,v 1.5 2003/06/30 19:50:31 dillon Exp $
46 * Vector interrupt control section
48 * *_imask - Interrupt masks for various spl*() functions
49 * ipending - Pending interrupts (set when a masked interrupt occurs)
55 /* current priority (all off) */
58 _tty_imask: .long SWI_TTY_MASK
60 _bio_imask: .long SWI_CLOCK_MASK | SWI_CAMBIO_MASK
62 _net_imask: .long SWI_NET_MASK | SWI_CAMNET_MASK
64 _cam_imask: .long SWI_CAMBIO_MASK | SWI_CAMNET_MASK
66 _soft_imask: .long SWI_MASK
68 _softnet_imask: .long SWI_NET_MASK
70 _softtty_imask: .long SWI_TTY_MASK
81 * Handle return from interrupts, traps and syscalls. This function
82 * checks the cpl for unmasked pending interrupts (fast, normal, or
83 * soft) and schedules them if appropriate, then irets.
86 .type _doreti,@function
88 FAKE_MCOUNT(_bintr) /* init "from" _bintr -> _doreti */
89 popl %eax /* cpl to restore */
91 cli /* interlock with TDPRI_CRIT */
92 movl %eax,TD_CPL(%ebx) /* save cpl being restored */
93 cmpl $TDPRI_CRIT,TD_PRI(%ebx) /* can't unpend if in critical sec */
95 addl $TDPRI_CRIT,TD_PRI(%ebx) /* force all ints to pending */
97 sti /* allow new interrupts */
98 movl %eax,%ecx /* cpl being restored */
100 cli /* disallow YYY remove */
101 testl _fpending,%ecx /* check for an unmasked fast int */
104 movl _irunning,%edx /* check for an unmasked normal int */
105 notl %edx /* that isn't already running */
109 testl $AST_PENDING,_astpending /* any pending ASTs? */
111 testl $PSL_VM,TF_EFLAGS(%esp)
113 cmpl $1,_in_vm86call /* YYY make per 'cpu' */
116 testb $SEL_RPL_MASK,TF_CS(%esp)
120 * Nothing left to do, finish up. Interrupts are still disabled.
123 subl $TDPRI_CRIT,TD_PRI(%ebx) /* interlocked with cli */
125 decl _intr_nesting_level
127 .globl doreti_popl_fs
128 .globl doreti_popl_es
129 .globl doreti_popl_ds
131 .globl doreti_syscall_ret
145 .globl doreti_iret_fault
150 .globl doreti_popl_ds_fault
151 doreti_popl_ds_fault:
153 .globl doreti_popl_es_fault
154 doreti_popl_es_fault:
156 .globl doreti_popl_fs_fault
157 doreti_popl_fs_fault:
158 movl $0,TF_ERR(%esp) /* XXX should be the error code */
159 movl $T_PROTFLT,TF_TRAPNO(%esp)
160 jmp alltraps_with_regs_pushed
163 * FAST interrupt pending
167 andl _fpending,%ecx /* only check fast ints */
168 bsfl %ecx, %ecx /* locate the next dispatchable int */
169 btrl %ecx, _fpending /* is it really still pending? */
171 pushl %eax /* YYY cpl */
172 call *_fastunpend(,%ecx,4)
177 * INTR interrupt pending
181 andl _ipending,%ecx /* only check normal ints */
182 bsfl %ecx, %ecx /* locate the next dispatchable int */
183 btrl %ecx, _ipending /* is it really still pending? */
187 call _sched_ithd /* YYY must pull in imasks */
196 andl $~AST_PENDING,_astpending
198 movl $T_ASTFLT,TF_TRAPNO(%esp)
199 decl _intr_nesting_level
201 incl _intr_nesting_level
202 movl TD_CPL(%ebx),%eax /* retrieve cpl again for loop */
207 * SPLZ() a C callable procedure to dispatch any unmasked pending
208 * interrupts regardless of critical section nesting. ASTs
209 * are not dispatched.
211 * YYY at the moment I leave us in a critical section so as
212 * not to have to mess with the cpls which will soon be obsolete.
220 movl TD_CPL(%ebx),%eax
221 addl $TDPRI_CRIT,TD_PRI(%ebx)
225 movl %eax,%ecx /* ecx = ~CPL */
227 testl _fpending,%ecx /* check for an unmasked fast int */
230 movl _irunning,%edx /* check for an unmasked normal int */
231 notl %edx /* that isn't already running */
236 subl $TDPRI_CRIT,TD_PRI(%ebx)
242 * FAST interrupt pending
246 andl _fpending,%ecx /* only check fast ints */
247 bsfl %ecx, %ecx /* locate the next dispatchable int */
248 btrl %ecx, _fpending /* is it really still pending? */
253 call *_fastunpend(,%ecx,4)
259 * INTR interrupt pending
263 andl _ipending,%ecx /* only check normal ints */
264 bsfl %ecx, %ecx /* locate the next dispatchable int */
265 btrl %ecx, _ipending /* is it really still pending? */
272 call _sched_ithd /* YYY must pull in imasks */
279 * APIC/ICU specific ipl functions provide masking and unmasking
280 * calls for userland.
284 #include "i386/isa/apic_ipl.s"
286 #include "i386/isa/icu_ipl.s"