189 lines
4.4 KiB
ArmAsm
189 lines
4.4 KiB
ArmAsm
/*-
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* Copyright (c) 1993, 1994 Charles Hannum.
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* Copyright (c) 1989, 1990 William F. Jolitz.
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)icu.s 7.2 (Berkeley) 5/21/91
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* $Id: icu.s,v 1.34 1994/05/13 11:11:42 mycroft Exp $
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*/
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/*
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* AT/386
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* Vector interrupt control section
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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
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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
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movl $1f,%esi
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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
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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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/*
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* Now interrupt frame is a trap frame!
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*
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* XXX
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* Setting up the interrupt frame to be almost a stack frame is mostly a waste
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* of time.
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*/
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movl %ebx,_cpl
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movl $1f,%esi
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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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testb $SEL_RPL_MASK,TF_CS(%esp)
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jz 3f
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btrl $0,_astpending
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jnc 3f
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sti
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/* Pushed T_ASTFLT into TF_TRAPNO on interrupt 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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btrl $s,%edi ;\
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jnc 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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