NetBSD/sys/arch/i386/isa/icu.s

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/*-
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* Copyright (c) 1993, 1994 Charles Hannum.
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* Copyright (c) 1989, 1990 William F. Jolitz.
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
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* 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.
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* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
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* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
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*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* from: @(#)icu.s 7.2 (Berkeley) 5/21/91
* $Id: icu.s,v 1.35 1994/07/22 07:52:50 mycroft Exp $
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*/
/*
* AT/386
* Vector interrupt control section
*/
#include <net/netisr.h>
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.data
.globl _imen,_cpl,_ipending,_astpending,_netisr
_imen:
.long 0xffff # interrupt mask enable (all off)
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.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
* edi - scratch for Xsoftnet
*/
ENTRY(spllower)
IDTVEC(spllower)
pushl %ebx
pushl %esi
pushl %edi
movl _cpl,%ebx
movl $1f,%esi
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
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/*
* Handle return from interrupt after device handler finishes.
*
* Important registers:
* ebx - cpl to restore
* esi - address to resume loop
* edi - scratch for Xsoftnet
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*/
IDTVEC(doreti)
popl %ebx # get previous priority
/*
* Now interrupt frame is a trap frame!
*
* XXX
* Setting up the interrupt frame to be almost a stack frame is mostly a waste
* of time.
*/
movl %ebx,_cpl
movl $1f,%esi
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
jmp *_Xresume(,%eax,4)
2: /* Check for ASTs on exit to user mode. */
cli
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testb $SEL_RPL_MASK,TF_CS(%esp)
jz 3f
btrl $0,_astpending
jnc 3f
sti
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/* Pushed T_ASTFLT into TF_TRAPNO on interrupt entry. */
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call _trap
3: INTRFASTEXIT
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/*
* Soft interrupt handlers
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*/
IDTVEC(softtty)
/* XXXX nothing for now */
jmp %esi
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#define DONET(s, c) \
.globl c ;\
btl $s,%edi ;\
jnc 1f ;\
call c ;\
1:
IDTVEC(softnet)
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leal SIR_NETMASK(%ebx),%eax
movl %eax,_cpl
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xorl %edi,%edi
xchgl _netisr,%edi
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#ifdef INET
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#include "ether.h"
#if NETHER > 0
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DONET(NETISR_ARP, _arpintr)
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#endif
DONET(NETISR_IP, _ipintr)
#endif
#ifdef IMP
DONET(NETISR_IMP, _impintr)
#endif
#ifdef NS
DONET(NETISR_NS, _nsintr)
#endif
#ifdef ISO
DONET(NETISR_ISO, _clnlintr)
#endif
#ifdef CCITT
DONET(NETISR_CCITT, _ccittintr)
#endif
movl %ebx,_cpl
jmp %esi
IDTVEC(softclock)
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leal SIR_CLOCKMASK(%ebx),%eax
movl %eax,_cpl
call _softclock
movl %ebx,_cpl
jmp %esi