384 lines
8.6 KiB
ArmAsm
384 lines
8.6 KiB
ArmAsm
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/*-
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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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* @(#)icu.s 7.2 (Berkeley) 5/21/91
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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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.data
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.globl _imen
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.globl _cpl
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_cpl: .long 0xffff # current priority level (all off)
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_imen: .long 0xffff # interrupt mask enable (all off)
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.globl _highmask
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_highmask: .long 0xffff
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.globl _ttymask
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_ttymask: .long 0
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.globl _biomask
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_biomask: .long 0
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.globl _netmask
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_netmask: .long 0
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.globl _isa_intr
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_isa_intr: .space 16*4
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.text
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/*
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* Handle return from interrupt after device handler finishes
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*/
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doreti:
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cli
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popl %ebx # remove intr number
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NOP
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popl %eax # get previous priority
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# now interrupt frame is a trap frame!
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movw %ax,%cx
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movw %ax,_cpl
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orw _imen,%ax
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outb %al,$ IO_ICU1+1 # re-enable intr?
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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cmpw $0x1f,13*4(%esp) # to user?
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je 1f # nope, leave
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andw $0xffff,%cx
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cmpw $0,%cx # returning to zero?
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je 1f
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pop %es # nope, going to non-zero level
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pop %ds
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popa
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addl $8,%esp
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iret
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1: cmpl $0,_netisr # check for softint s/traps
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jne 1f
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cmpl $0,_want_resched
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jne 1f
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pop %es # none, going back to base pri
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pop %ds
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popa
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addl $8,%esp
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iret
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#include "../net/netisr.h"
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1:
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#define DONET(s, c) ; \
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.globl c ; \
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btrl $ s ,_netisr ; \
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jnb 1f ; \
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call c ; \
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1:
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call _splnet
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DONET(NETISR_RAW,_rawintr)
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#ifdef INET
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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 notdef
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NOP
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popl %eax
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movw %ax,_cpl
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orw _imen,%ax
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outb %al,$ IO_ICU1+1 # re-enable intr?
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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#else
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call _spl0
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#endif
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btrl $ NETISR_SCLK,_netisr
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jnb 1f
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# back to an interrupt frame for a moment
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call _splsoftclock
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pushl $0xff # dummy intr
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call _softclock
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popl %eax
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call _spl0
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# jmp 2f
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1:
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cmpw $0x1f,13*4(%esp) # to user?
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jne 2f # nope, leave
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cmpl $0,_want_resched
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je 2f
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call _trap
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2: pop %es
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pop %ds
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popal
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addl $8,%esp
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iret
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/*
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* Interrupt priority mechanism
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*
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* Two flavors -- imlXX masks relative to ISA noemenclature (for PC compat sw)
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* -- splXX masks with group mechanism for BSD purposes
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*/
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.globl _splhigh
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.globl _splclock
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_splhigh:
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_splclock:
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cli # disable interrupts
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NOP
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movw $0xffff,%ax # set new priority level
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movw %ax,%dx
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# orw _imen,%ax # mask off those not enabled yet
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movw %ax,%cx
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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movzwl _cpl,%eax # return old priority
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movw %dx,_cpl # set new priority level
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sti # enable interrupts
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ret
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.globl _spltty # block clists
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_spltty:
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cli # disable interrupts
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NOP
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movw _cpl,%ax
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orw _ttymask,%ax
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movw %ax,%dx
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orw _imen,%ax # mask off those not enabled yet
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movw %ax,%cx
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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movzwl _cpl,%eax # return old priority
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movw %dx,_cpl # set new priority level
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sti # enable interrupts
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ret
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.globl _splimp
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.globl _splnet
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_splimp:
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_splnet:
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cli # disable interrupts
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NOP
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movw _cpl,%ax
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orw _netmask,%ax
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movw %ax,%dx
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orw _imen,%ax # mask off those not enabled yet
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movw %ax,%cx
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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movzwl _cpl,%eax # return old priority
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movw %dx,_cpl # set new priority level
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sti # enable interrupts
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ret
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.globl _splbio
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_splbio:
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cli # disable interrupts
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NOP
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movw _cpl,%ax
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orw _biomask,%ax
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movw %ax,%dx
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orw _imen,%ax # mask off those not enabled yet
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movw %ax,%cx
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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movzwl _cpl,%eax # return old priority
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movw %dx,_cpl # set new priority level
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sti # enable interrupts
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ret
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.globl _splsoftclock
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_splsoftclock:
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cli # disable interrupts
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NOP
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movw _cpl,%ax
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orw $0x8000,%ax # set new priority level
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movw %ax,%dx
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orw _imen,%ax # mask off those not enabled yet
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movw %ax,%cx
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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movzwl _cpl,%eax # return old priority
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movw %dx,_cpl # set new priority level
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sti # enable interrupts
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ret
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.globl _splnone
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.globl _spl0
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_splnone:
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_spl0:
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cli # disable interrupts
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NOP
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pushl _cpl # save old priority
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movw _cpl,%ax
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orw _netmask,%ax # mask off those network devices
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movw %ax,_cpl # set new priority level
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orw _imen,%ax # mask off those not enabled yet
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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sti # enable interrupts
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DONET(NETISR_RAW,_rawintr)
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#ifdef INET
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DONET(NETISR_IP,_ipintr)
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#endif
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cli # disable interrupts
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popl _cpl # save old priority
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NOP
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movw $0,%ax # set new priority level
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movw %ax,%dx
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orw _imen,%ax # mask off those not enabled yet
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movw %ax,%cx
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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movzwl _cpl,%eax # return old priority
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movw %dx,_cpl # set new priority level
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sti # enable interrupts
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ret
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.globl _splx
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_splx:
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cli # disable interrupts
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NOP
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movw 4(%esp),%ax # new priority level
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movw %ax,%dx
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cmpw $0,%dx
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je _spl0 # going to "zero level" is special
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orw _imen,%ax # mask off those not enabled yet
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movw %ax,%cx
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outb %al,$ IO_ICU1+1 /* update icu's */
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NOP
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movb %ah,%al
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outb %al,$ IO_ICU2+1
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NOP
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movzwl _cpl,%eax # return old priority
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movw %dx,_cpl # set new priority level
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sti # enable interrupts
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ret
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/* hardware interrupt catcher (IDT 32 - 47) */
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.globl _isa_strayintr
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IDTVEC(intr0)
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INTRSTRAY(0, _highmask, 0) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr1)
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INTRSTRAY(1, _highmask, 1) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr2)
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INTRSTRAY(2, _highmask, 2) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr3)
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INTRSTRAY(3, _highmask, 3) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr4)
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INTRSTRAY(4, _highmask, 4) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr5)
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INTRSTRAY(5, _highmask, 5) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr6)
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INTRSTRAY(6, _highmask, 6) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr7)
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INTRSTRAY(7, _highmask, 7) ; call _isa_strayintr ; INTREXIT1
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IDTVEC(intr8)
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INTRSTRAY(8, _highmask, 8) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intr9)
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INTRSTRAY(9, _highmask, 9) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intr10)
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INTRSTRAY(10, _highmask, 10) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intr11)
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INTRSTRAY(11, _highmask, 11) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intr12)
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INTRSTRAY(12, _highmask, 12) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intr13)
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INTRSTRAY(13, _highmask, 13) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intr14)
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INTRSTRAY(14, _highmask, 14) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intr15)
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INTRSTRAY(15, _highmask, 15) ; call _isa_strayintr ; INTREXIT2
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IDTVEC(intrdefault)
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INTRSTRAY(255, _highmask, 255) ; call _isa_strayintr ; INTREXIT2
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