168 lines
4.0 KiB
ArmAsm
168 lines
4.0 KiB
ArmAsm
/* $NetBSD: icu.s,v 1.41 1995/05/01 08:25:30 mycroft Exp $ */
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/*-
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* Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles M. Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <net/netisr.h>
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.data
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.globl _imen,_cpl,_ipending,_astpending,_netisr
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_imen:
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.long 0xffff # interrupt mask enable (all off)
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.text
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#if defined(PROF) || defined(GPROF)
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.globl _splhigh, _splx
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ALIGN_TEXT
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_splhigh:
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movl $-1,%eax
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xchgl %eax,_cpl
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ret
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ALIGN_TEXT
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_splx:
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movl 4(%esp),%eax
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movl %eax,_cpl
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testl %eax,%eax
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jnz _Xspllower
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ret
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#endif /* PROF || GPROF */
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/*
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* Process pending interrupts.
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*
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* Important registers:
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* ebx - cpl
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* esi - address to resume loop at
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* edi - scratch for Xsoftnet
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*/
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ENTRY(spllower)
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IDTVEC(spllower)
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pushl %ebx
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pushl %esi
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pushl %edi
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movl _cpl,%ebx # save priority
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movl $1f,%esi # address to resume loop at
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1: movl %ebx,%eax
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notl %eax
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andl _ipending,%eax
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jz 2f
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bsfl %eax,%eax
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btrl %eax,_ipending
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jnc 1b
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jmp *_Xrecurse(,%eax,4)
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2: popl %edi
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popl %esi
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popl %ebx
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ret
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/*
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* Handle return from interrupt after device handler finishes.
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*
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* Important registers:
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* ebx - cpl to restore
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* esi - address to resume loop at
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* edi - scratch for Xsoftnet
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*/
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IDTVEC(doreti)
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popl %ebx # get previous priority
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movl %ebx,_cpl
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movl $1f,%esi # address to resume loop at
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1: movl %ebx,%eax
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notl %eax
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andl _ipending,%eax
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jz 2f
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bsfl %eax,%eax # slow, but not worth optimizing
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btrl %eax,_ipending
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jnc 1b # some intr cleared the in-memory bit
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jmp *_Xresume(,%eax,4)
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2: /* Check for ASTs on exit to user mode. */
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cli
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cmpb $0,_astpending
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je 3f
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testb $SEL_RPL,TF_CS(%esp)
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jz 3f
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movb $0,_astpending
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sti
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/* Pushed T_ASTFLT into tf_trapno on entry. */
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call _trap
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3: INTRFASTEXIT
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/*
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* Soft interrupt handlers
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*/
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IDTVEC(softtty)
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/* XXXX nothing for now */
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jmp %esi
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#define DONET(s, c) \
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.globl c ;\
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testl $(1 << s),%edi ;\
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jz 1f ;\
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call c ;\
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1:
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IDTVEC(softnet)
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leal SIR_NETMASK(%ebx),%eax
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movl %eax,_cpl
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xorl %edi,%edi
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xchgl _netisr,%edi
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#ifdef INET
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#include "ether.h"
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#if NETHER > 0
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DONET(NETISR_ARP, _arpintr)
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#endif
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DONET(NETISR_IP, _ipintr)
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#endif
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#ifdef IMP
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DONET(NETISR_IMP, _impintr)
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#endif
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#ifdef NS
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DONET(NETISR_NS, _nsintr)
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#endif
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#ifdef ISO
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DONET(NETISR_ISO, _clnlintr)
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#endif
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#ifdef CCITT
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DONET(NETISR_CCITT, _ccittintr)
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#endif
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movl %ebx,_cpl
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jmp %esi
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IDTVEC(softclock)
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leal SIR_CLOCKMASK(%ebx),%eax
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movl %eax,_cpl
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call _softclock
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movl %ebx,_cpl
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jmp %esi
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