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
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10 * modification, are permitted provided that the following conditions
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19 * This product includes software developed by the University of
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25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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/platform/pc32/isa/ipl.s,v 1.13 2003/09/25 23:49:08 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
77 * Handle return from interrupts, traps and syscalls. This function
78 * checks the cpl for unmasked pending interrupts (fast, normal, or
79 * soft) and schedules them if appropriate, then irets.
81 * If we are in a critical section we cannot run any pending ints
82 * nor can be play with mp_lock.
85 .type doreti,@function
87 FAKE_MCOUNT(bintr) /* init "from" bintr -> doreti */
88 popl %eax /* cpl to restore */
89 movl PCPU(curthread),%ebx
90 cli /* interlock with TDPRI_CRIT */
91 cmpl $0,PCPU(reqflags) /* short cut if nothing to do */
93 movl %eax,TD_CPL(%ebx) /* save cpl being restored */
94 cmpl $TDPRI_CRIT,TD_PRI(%ebx) /* can't unpend if in critical sec */
96 addl $TDPRI_CRIT,TD_PRI(%ebx) /* force all ints to pending */
98 sti /* allow new interrupts */
99 movl %eax,%ecx /* cpl being restored */
101 cli /* disallow YYY remove */
103 testl $RQF_IPIQ,PCPU(reqflags)
106 testl PCPU(fpending),%ecx /* check for an unmasked fast int */
109 testl PCPU(ipending),%ecx
112 testl $RQF_AST_MASK,PCPU(reqflags) /* any pending ASTs? */
114 testl $PSL_VM,TF_EFLAGS(%esp)
116 cmpl $1,in_vm86call /* YYY make per 'cpu'? */
119 testb $SEL_RPL_MASK,TF_CS(%esp)
123 * Nothing left to do, finish up. Interrupts are still disabled.
124 * If our temporary cpl mask is 0 then we have processed all pending
125 * fast and normal ints including those requiring the MP lock,
126 * and we have processed as many of the reqflags as possible based
127 * on whether we came from user mode or not. So if %eax is 0 we
128 * can clear the interrupt-related reqflags.
130 subl $TDPRI_CRIT,TD_PRI(%ebx) /* interlocked with cli */
133 andl $~RQF_INTPEND,PCPU(reqflags)
136 .globl doreti_popl_fs
137 .globl doreti_popl_es
138 .globl doreti_popl_ds
140 .globl doreti_syscall_ret
154 .globl doreti_iret_fault
159 .globl doreti_popl_ds_fault
160 doreti_popl_ds_fault:
162 .globl doreti_popl_es_fault
163 doreti_popl_es_fault:
165 .globl doreti_popl_fs_fault
166 doreti_popl_fs_fault:
167 movl $0,TF_ERR(%esp) /* XXX should be the error code */
168 movl $T_PROTFLT,TF_TRAPNO(%esp)
169 jmp alltraps_with_regs_pushed
172 * FAST interrupt pending
176 andl PCPU(fpending),%ecx /* only check fast ints */
177 bsfl %ecx, %ecx /* locate the next dispatchable int */
178 btrl %ecx, PCPU(fpending) /* is it really still pending? */
180 pushl %eax /* YYY cpl (expected by frame) */
182 pushl %ecx /* save ecx */
187 /* MP lock successful */
189 incl PCPU(intr_nesting_level)
190 call *fastunpend(,%ecx,4)
191 decl PCPU(intr_nesting_level)
198 btsl %ecx, PCPU(fpending) /* oops, couldn't get the MP lock */
199 popl %eax /* add to temp. cpl mask to ignore */
200 orl PCPU(fpending),%eax
204 * INTR interrupt pending
206 * Temporarily back-out our critical section to allow the interrupt
211 andl PCPU(ipending),%ecx /* only check normal ints */
212 bsfl %ecx, %ecx /* locate the next dispatchable int */
213 btrl %ecx, PCPU(ipending) /* is it really still pending? */
217 subl $TDPRI_CRIT,TD_PRI(%ebx) /* so we can preempt */
218 call sched_ithd /* YYY must pull in imasks */
219 addl $TDPRI_CRIT,TD_PRI(%ebx)
225 * AST pending. We clear RQF_AST_SIGNAL automatically, the others
226 * are cleared by the trap as they are processed.
228 * Temporarily back-out our critical section because trap() can be
229 * a long-winded call, and we want to be more syscall-like.
231 * YYY theoretically we can call lwkt_switch directly if all we need
232 * to do is a reschedule.
235 andl $~RQF_AST_SIGNAL,PCPU(reqflags)
237 movl %eax,%esi /* save cpl (can't use stack) */
238 movl $T_ASTFLT,TF_TRAPNO(%esp)
239 subl $TDPRI_CRIT,TD_PRI(%ebx)
241 addl $TDPRI_CRIT,TD_PRI(%ebx)
242 movl %esi,%eax /* restore cpl for loop */
247 * IPIQ message pending. We clear RQF_IPIQ automatically.
250 incl PCPU(intr_nesting_level)
251 andl $~RQF_IPIQ,PCPU(reqflags)
252 call lwkt_process_ipiq
253 decl PCPU(intr_nesting_level)
254 movl TD_CPL(%ebx),%eax /* retrieve cpl again for loop */
260 * SPLZ() a C callable procedure to dispatch any unmasked pending
261 * interrupts regardless of critical section nesting. ASTs
262 * are not dispatched.
264 * YYY at the moment I leave us in a critical section so as
265 * not to have to mess with the cpls which will soon be obsolete.
272 movl PCPU(curthread),%ebx
273 movl TD_CPL(%ebx),%eax
274 addl $TDPRI_CRIT,TD_PRI(%ebx)
278 movl %eax,%ecx /* ecx = ~CPL */
281 testl $RQF_IPIQ,PCPU(reqflags)
284 testl PCPU(fpending),%ecx /* check for an unmasked fast int */
287 testl PCPU(ipending),%ecx
290 subl $TDPRI_CRIT,TD_PRI(%ebx)
293 * Nothing left to do, finish up. Interrupts are still disabled.
294 * If our temporary cpl mask is 0 then we have processed everything
295 * (including any pending fast ints requiring the MP lock), and
296 * we can clear RQF_INTPEND.
300 andl $~RQF_INTPEND,PCPU(reqflags)
307 * FAST interrupt pending
311 andl PCPU(fpending),%ecx /* only check fast ints */
312 bsfl %ecx, %ecx /* locate the next dispatchable int */
313 btrl %ecx, PCPU(fpending) /* is it really still pending? */
323 call *fastunpend(,%ecx,4)
330 btsl %ecx, PCPU(fpending) /* oops, couldn't get the MP lock */
332 orl PCPU(fpending),%eax
336 * INTR interrupt pending
338 * Temporarily back-out our critical section to allow the interrupt
343 andl PCPU(ipending),%ecx /* only check normal ints */
344 bsfl %ecx, %ecx /* locate the next dispatchable int */
345 btrl %ecx, PCPU(ipending) /* is it really still pending? */
350 subl $TDPRI_CRIT,TD_PRI(%ebx)
351 call sched_ithd /* YYY must pull in imasks */
352 addl $TDPRI_CRIT,TD_PRI(%ebx)
359 andl $~RQF_IPIQ,PCPU(reqflags)
361 call lwkt_process_ipiq
367 * APIC/ICU specific ipl functions provide masking and unmasking
368 * calls for userland.
372 #include "i386/isa/apic_ipl.s"
374 #include "i386/isa/icu_ipl.s"