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[unix-history] / usr / src / sys.386bsd / i386 / isa / icu.s
/*-
* 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.
* 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 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.
*
* 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.
*
* @(#)icu.s 7.2 (Berkeley) 5/21/91
*
* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
* -------------------- ----- ----------------------
* CURRENT PATCH LEVEL: 2 00117
* -------------------- ----- ----------------------
*
* 28 Nov 92 Frank MacLachlan Aligned addresses and data
* on 32bit boundaries.
* 24 Mar 93 Rodney W. Grimes Added interrupt counters for vmstat
* also stray and false intr counters added
*/
/*
* AT/386
* Vector interrupt control section
*/
.data
ALIGN32
.globl _imen
.globl _cpl
_cpl: .long 0xffff # current priority level (all off)
_imen: .long 0xffff # interrupt mask enable (all off)
.globl _highmask
_highmask: .long 0xffff
.globl _ttymask
_ttymask: .long 0
.globl _biomask
_biomask: .long 0
.globl _netmask
_netmask: .long 0
.globl _isa_intr
/*
* This is the names of the counters for vmstat added by
* rgrimes@agora.rain.com (Rodney W. Grimes) 10/30/1992
* Added false and stray counters 3/25/1993 rgrimes
*/
.globl _intrcnt, _eintrcnt /* Added to make vmstat happy */
.globl _isa_false7_intrcnt, _isa_false15_intrcnt, _isa_stray_intrcnt
_intrcnt: /* Added to make vmstat happy */
_isa_false7_intrcnt:
.space 4 /* false IRQ7's */
_isa_false15_intrcnt:
.space 4 /* false IRQ15's */
_isa_stray_intrcnt:
.space 4 /* stray interrupts */
_isa_intr: .space 16*4
_eintrcnt: /* Added to make vmstat happy */
.text
/*
* Handle return from interrupt after device handler finishes
*/
ALIGN32
doreti:
cli
popl %ebx # remove intr number
NOP
popl %eax # get previous priority
# now interrupt frame is a trap frame!
movw %ax,%cx
movw %ax,_cpl
orw _imen,%ax
outb %al,$ IO_ICU1+1 # re-enable intr?
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
cmpw $0x1f,13*4(%esp) # to user?
je 1f # nope, leave
andw $0xffff,%cx
cmpw $0,%cx # returning to zero?
je 1f
pop %es # nope, going to non-zero level
pop %ds
popa
addl $8,%esp
iret
ALIGN32
1: cmpl $0,_netisr # check for softint s/traps
jne 1f
cmpl $0,_want_resched
jne 1f
pop %es # none, going back to base pri
pop %ds
popa
addl $8,%esp
iret
#include "../net/netisr.h"
ALIGN32
1:
#define DONET(s, c) ; \
.globl c ; \
btrl $ s ,_netisr ; \
jnb 1f ; \
call c ; \
1:
call _splnet
DONET(NETISR_RAW,_rawintr)
#ifdef INET
DONET(NETISR_IP,_ipintr)
#endif
#ifdef IMP
DONET(NETISR_IMP,_impintr)
#endif
#ifdef NS
DONET(NETISR_NS,_nsintr)
#endif
#ifdef notdef
NOP
popl %eax
movw %ax,_cpl
orw _imen,%ax
outb %al,$ IO_ICU1+1 # re-enable intr?
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
#else
call _spl0
#endif
btrl $ NETISR_SCLK,_netisr
jnb 1f
# back to an interrupt frame for a moment
call _splsoftclock
pushl $0xff # dummy intr
call _softclock
popl %eax
call _spl0
# jmp 2f
1:
cmpw $0x1f,13*4(%esp) # to user?
jne 2f # nope, leave
cmpl $0,_want_resched
je 2f
call _trap
2: pop %es
pop %ds
popal
addl $8,%esp
iret
/*
* Interrupt priority mechanism
*
* Two flavors -- imlXX masks relative to ISA noemenclature (for PC compat sw)
* -- splXX masks with group mechanism for BSD purposes
*/
.globl _splhigh
.globl _splclock
ALIGN32
_splhigh:
_splclock:
cli # disable interrupts
NOP
movw $0xffff,%ax # set new priority level
movw %ax,%dx
# orw _imen,%ax # mask off those not enabled yet
movw %ax,%cx
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
movzwl _cpl,%eax # return old priority
movw %dx,_cpl # set new priority level
sti # enable interrupts
ret
.globl _spltty # block clists
ALIGN32
_spltty:
cli # disable interrupts
NOP
movw _cpl,%ax
orw _ttymask,%ax
movw %ax,%dx
orw _imen,%ax # mask off those not enabled yet
movw %ax,%cx
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
movzwl _cpl,%eax # return old priority
movw %dx,_cpl # set new priority level
sti # enable interrupts
ret
.globl _splimp
.globl _splnet
ALIGN32
_splimp:
_splnet:
cli # disable interrupts
NOP
movw _cpl,%ax
orw _netmask,%ax
movw %ax,%dx
orw _imen,%ax # mask off those not enabled yet
movw %ax,%cx
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
movzwl _cpl,%eax # return old priority
movw %dx,_cpl # set new priority level
sti # enable interrupts
ret
.globl _splbio
ALIGN32
_splbio:
cli # disable interrupts
NOP
movw _cpl,%ax
orw _biomask,%ax
movw %ax,%dx
orw _imen,%ax # mask off those not enabled yet
movw %ax,%cx
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
movzwl _cpl,%eax # return old priority
movw %dx,_cpl # set new priority level
sti # enable interrupts
ret
.globl _splsoftclock
ALIGN32
_splsoftclock:
cli # disable interrupts
NOP
movw _cpl,%ax
orw $0x8000,%ax # set new priority level
movw %ax,%dx
orw _imen,%ax # mask off those not enabled yet
movw %ax,%cx
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
movzwl _cpl,%eax # return old priority
movw %dx,_cpl # set new priority level
sti # enable interrupts
ret
.globl _splnone
.globl _spl0
ALIGN32
_splnone:
_spl0:
cli # disable interrupts
NOP
pushl _cpl # save old priority
movw _cpl,%ax
orw _netmask,%ax # mask off those network devices
movw %ax,_cpl # set new priority level
orw _imen,%ax # mask off those not enabled yet
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
sti # enable interrupts
DONET(NETISR_RAW,_rawintr)
#ifdef INET
DONET(NETISR_IP,_ipintr)
#endif
cli # disable interrupts
popl _cpl # save old priority
NOP
movw $0,%ax # set new priority level
movw %ax,%dx
orw _imen,%ax # mask off those not enabled yet
movw %ax,%cx
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
movzwl _cpl,%eax # return old priority
movw %dx,_cpl # set new priority level
sti # enable interrupts
ret
.globl _splx
ALIGN32
_splx:
cli # disable interrupts
NOP
movw 4(%esp),%ax # new priority level
movw %ax,%dx
cmpw $0,%dx
je _spl0 # going to "zero level" is special
orw _imen,%ax # mask off those not enabled yet
movw %ax,%cx
outb %al,$ IO_ICU1+1 /* update icu's */
NOP
movb %ah,%al
outb %al,$ IO_ICU2+1
NOP
movzwl _cpl,%eax # return old priority
movw %dx,_cpl # set new priority level
sti # enable interrupts
ret
/* hardware interrupt catcher (IDT 32 - 47) */
.globl _isa_strayintr
IDTVEC(intr0)
INTRSTRAY(0, _highmask, 0) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr1)
INTRSTRAY(1, _highmask, 1) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr2)
INTRSTRAY(2, _highmask, 2) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr3)
INTRSTRAY(3, _highmask, 3) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr4)
INTRSTRAY(4, _highmask, 4) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr5)
INTRSTRAY(5, _highmask, 5) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr6)
INTRSTRAY(6, _highmask, 6) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr7)
INTRSTRAY(7, _highmask, 7) ; call _isa_strayintr ; INTREXIT1
IDTVEC(intr8)
INTRSTRAY(8, _highmask, 8) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intr9)
INTRSTRAY(9, _highmask, 9) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intr10)
INTRSTRAY(10, _highmask, 10) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intr11)
INTRSTRAY(11, _highmask, 11) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intr12)
INTRSTRAY(12, _highmask, 12) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intr13)
INTRSTRAY(13, _highmask, 13) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intr14)
INTRSTRAY(14, _highmask, 14) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intr15)
INTRSTRAY(15, _highmask, 15) ; call _isa_strayintr ; INTREXIT2
IDTVEC(intrdefault)
INTRSTRAY(255, _highmask, 255) ; call _isa_strayintr ; INTREXIT2
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.