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/i386/isa/Attic/ipl.s,v 1.12 2003/08/25 19:50:32 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.
82 .type doreti,@function
84 FAKE_MCOUNT(bintr) /* init "from" bintr -> doreti */
85 popl %eax /* cpl to restore */
86 movl PCPU(curthread),%ebx
87 cli /* interlock with TDPRI_CRIT */
88 cmpl $0,PCPU(reqflags) /* short cut if nothing to do */
90 movl %eax,TD_CPL(%ebx) /* save cpl being restored */
91 cmpl $TDPRI_CRIT,TD_PRI(%ebx) /* can't unpend if in critical sec */
93 addl $TDPRI_CRIT,TD_PRI(%ebx) /* force all ints to pending */
95 sti /* allow new interrupts */
96 movl %eax,%ecx /* cpl being restored */
98 cli /* disallow YYY remove */
100 testl $RQF_IPIQ,PCPU(reqflags)
103 testl PCPU(fpending),%ecx /* check for an unmasked fast int */
106 testl PCPU(ipending),%ecx
109 testl $RQF_AST_MASK,PCPU(reqflags) /* 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.
121 * If our temporary cpl mask is 0 then we have processed all pending
122 * fast and normal ints including those requiring the MP lock,
123 * and we have processed as many of the reqflags as possible based
124 * on whether we came from user mode or not. So if %eax is 0 we
125 * can clear the interrupt-related reqflags.
127 subl $TDPRI_CRIT,TD_PRI(%ebx) /* interlocked with cli */
130 andl $~RQF_INTPEND,PCPU(reqflags)
133 .globl doreti_popl_fs
134 .globl doreti_popl_es
135 .globl doreti_popl_ds
137 .globl doreti_syscall_ret
151 .globl doreti_iret_fault
156 .globl doreti_popl_ds_fault
157 doreti_popl_ds_fault:
159 .globl doreti_popl_es_fault
160 doreti_popl_es_fault:
162 .globl doreti_popl_fs_fault
163 doreti_popl_fs_fault:
164 movl $0,TF_ERR(%esp) /* XXX should be the error code */
165 movl $T_PROTFLT,TF_TRAPNO(%esp)
166 jmp alltraps_with_regs_pushed
169 * FAST interrupt pending
173 andl PCPU(fpending),%ecx /* only check fast ints */
174 bsfl %ecx, %ecx /* locate the next dispatchable int */
175 btrl %ecx, PCPU(fpending) /* is it really still pending? */
177 pushl %eax /* YYY cpl (expected by frame) */
179 pushl %ecx /* save ecx */
184 /* MP lock successful */
186 incl PCPU(intr_nesting_level)
187 call *fastunpend(,%ecx,4)
188 decl PCPU(intr_nesting_level)
195 btsl %ecx, PCPU(fpending) /* oops, couldn't get the MP lock */
196 popl %eax /* add to temp. cpl mask to ignore */
197 orl PCPU(fpending),%eax
201 * INTR interrupt pending
203 * Temporarily back-out our critical section to allow the interrupt
208 andl PCPU(ipending),%ecx /* only check normal ints */
209 bsfl %ecx, %ecx /* locate the next dispatchable int */
210 btrl %ecx, PCPU(ipending) /* is it really still pending? */
214 subl $TDPRI_CRIT,TD_PRI(%ebx) /* so we can preempt */
215 call sched_ithd /* YYY must pull in imasks */
216 addl $TDPRI_CRIT,TD_PRI(%ebx)
222 * AST pending. We clear RQF_AST_SIGNAL automatically, the others
223 * are cleared by the trap as they are processed.
225 * Temporarily back-out our critical section because trap() can be
226 * a long-winded call, and we want to be more syscall-like.
228 * YYY theoretically we can call lwkt_switch directly if all we need
229 * to do is a reschedule.
232 andl $~RQF_AST_SIGNAL,PCPU(reqflags)
234 movl %eax,%esi /* save cpl (can't use stack) */
235 movl $T_ASTFLT,TF_TRAPNO(%esp)
236 subl $TDPRI_CRIT,TD_PRI(%ebx)
238 addl $TDPRI_CRIT,TD_PRI(%ebx)
239 movl %esi,%eax /* restore cpl for loop */
244 * IPIQ message pending. We clear RQF_IPIQ automatically.
247 incl PCPU(intr_nesting_level)
248 andl $~RQF_IPIQ,PCPU(reqflags)
249 call lwkt_process_ipiq
250 decl PCPU(intr_nesting_level)
251 movl TD_CPL(%ebx),%eax /* retrieve cpl again for loop */
257 * SPLZ() a C callable procedure to dispatch any unmasked pending
258 * interrupts regardless of critical section nesting. ASTs
259 * are not dispatched.
261 * YYY at the moment I leave us in a critical section so as
262 * not to have to mess with the cpls which will soon be obsolete.
269 movl PCPU(curthread),%ebx
270 movl TD_CPL(%ebx),%eax
271 addl $TDPRI_CRIT,TD_PRI(%ebx)
275 movl %eax,%ecx /* ecx = ~CPL */
278 testl $RQF_IPIQ,PCPU(reqflags)
281 testl PCPU(fpending),%ecx /* check for an unmasked fast int */
284 testl PCPU(ipending),%ecx
287 subl $TDPRI_CRIT,TD_PRI(%ebx)
290 * Nothing left to do, finish up. Interrupts are still disabled.
291 * If our temporary cpl mask is 0 then we have processed everything
292 * (including any pending fast ints requiring the MP lock), and
293 * we can clear RQF_INTPEND.
297 andl $~RQF_INTPEND,PCPU(reqflags)
304 * FAST interrupt pending
308 andl PCPU(fpending),%ecx /* only check fast ints */
309 bsfl %ecx, %ecx /* locate the next dispatchable int */
310 btrl %ecx, PCPU(fpending) /* is it really still pending? */
320 call *fastunpend(,%ecx,4)
327 btsl %ecx, PCPU(fpending) /* oops, couldn't get the MP lock */
329 orl PCPU(fpending),%eax
333 * INTR interrupt pending
335 * Temporarily back-out our critical section to allow the interrupt
340 andl PCPU(ipending),%ecx /* only check normal ints */
341 bsfl %ecx, %ecx /* locate the next dispatchable int */
342 btrl %ecx, PCPU(ipending) /* is it really still pending? */
347 subl $TDPRI_CRIT,TD_PRI(%ebx)
348 call sched_ithd /* YYY must pull in imasks */
349 addl $TDPRI_CRIT,TD_PRI(%ebx)
356 andl $~RQF_IPIQ,PCPU(reqflags)
358 call lwkt_process_ipiq
364 * APIC/ICU specific ipl functions provide masking and unmasking
365 * calls for userland.
369 #include "i386/isa/apic_ipl.s"
371 #include "i386/isa/icu_ipl.s"