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/* $OpenBSD: icu.s,v 1.13 2000/11/08 11:34:23 art Exp $ */
/* $NetBSD: icu.s,v 1.45 1996/01/07 03:59:34 mycroft Exp $ */
/*-
* Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <net/netisr.h>
.data
.globl _imen,_cpl,_ipending,_astpending,_netisr
_imen:
.long 0xffff # interrupt mask enable (all off)
.text
#if defined(PROF) || defined(GPROF)
.globl _splhigh, _splx
ALIGN_TEXT
_splhigh:
movl $-1,%eax
xchgl %eax,_cpl
ret
ALIGN_TEXT
_splx:
movl 4(%esp),%eax
movl %eax,_cpl
testl %eax,%eax
jnz _Xspllower
ret
#endif /* PROF || GPROF */
/*
* Process pending interrupts.
*
* Important registers:
* ebx - cpl
* esi - address to resume loop at
* edi - scratch for Xsoftnet
*/
IDTVEC(spllower)
pushl %ebx
pushl %esi
pushl %edi
movl _cpl,%ebx # save priority
movl $1f,%esi # address to resume loop at
1: movl %ebx,%eax
notl %eax
andl _ipending,%eax
jz 2f
bsfl %eax,%eax
btrl %eax,_ipending
jnc 1b
jmp *_Xrecurse(,%eax,4)
2: popl %edi
popl %esi
popl %ebx
ret
/*
* Handle return from interrupt after device handler finishes.
*
* Important registers:
* ebx - cpl to restore
* esi - address to resume loop at
* edi - scratch for Xsoftnet
*/
IDTVEC(doreti)
popl %ebx # get previous priority
movl %ebx,_cpl
movl $1f,%esi # address to resume loop at
1: movl %ebx,%eax
notl %eax
andl _ipending,%eax
jz 2f
bsfl %eax,%eax # slow, but not worth optimizing
btrl %eax,_ipending
jnc 1b # some intr cleared the in-memory bit
cli
jmp *_Xresume(,%eax,4)
2: /* Check for ASTs on exit to user mode. */
cli
cmpb $0,_astpending
je 3f
testb $SEL_RPL,TF_CS(%esp)
#ifdef VM86
jnz 4f
testl $PSL_VM,TF_EFLAGS(%esp)
#endif
jz 3f
4: movb $0,_astpending
sti
/* Pushed T_ASTFLT into tf_trapno on entry. */
call _trap
jmp 2b
3: INTRFASTEXIT
/*
* Soft interrupt handlers
*/
#include "pccom.h"
IDTVEC(softtty)
#if NPCCOM > 0
leal SIR_TTYMASK(%ebx),%eax
movl %eax,_cpl
call _comsoft
movl %ebx,_cpl
#endif
jmp %esi
#define DONETISR(s, c) \
.globl _C_LABEL(c) ;\
testl $(1 << s),%edi ;\
jz 1f ;\
call _C_LABEL(c) ;\
1:
IDTVEC(softnet)
leal SIR_NETMASK(%ebx),%eax
movl %eax,_cpl
xorl %edi,%edi
xchgl _netisr,%edi
#include <net/netisr_dispatch.h>
movl %ebx,_cpl
jmp %esi
#undef DONETISR
IDTVEC(softclock)
leal SIR_CLOCKMASK(%ebx),%eax
movl %eax,_cpl
call _softclock
movl %ebx,_cpl
jmp %esi
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