date and time created 90/04/24 12:59:26 by william

[unix-history] / usr / src / sys / i386 / isa / icu.s

/*-
* 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.
*
* %sccs.include.386.c%
*
*      @(#)icu.s       5.1 (Berkeley) %G%
*/

/*
* AT/386
* Vector interrupt control section
* W. Jolitz    8/89
*/

       .data
       .globl  _imen
       .globl  _cpl
_cpl:   .long   15                      # current priority level (all off)
_imen:  .long   0xffff                  # interrupt mask enable (all off)
       .text

       .globl  _iml0                   # masks off all interrupts
       .globl  _splhigh
       .globl  _splclock
       .globl  _spl6
_iml0:
_spl6:
_splhigh:
_splclock:
       cli                             # disable interrupts
       movw    $0xffff,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
#       sti                             # enable interrupts
       ret

       .globl  _iml1                   # mask off all but irq0
       .globl  _spltty                 # block clists
_iml1:
_spltty:
       cli                             # disable interrupts
       movw    $0xfffe,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
#       sti                             # enable interrupts
       ret

       .globl  _iml8                   # mask off all but irq0-1
_iml8:
       cli                             # disable interrupts
       movw    $0xfffc,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
#       sti                             # enable interrupts
       ret

       .globl  _iml9                   # mask off all but irq0-1,8
       .globl  _iml2                   # alias for PC hardware level 2
       .globl  _splimp
       .globl  _splnet
_iml9:
_iml2:
_splimp:
_splnet:
       cli                             # disable interrupts
       movw    $0xfef8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
#       sti                             # enable interrupts
       ret

       .globl  _iml10                  # mask off all but irq0-1,8-9
_iml10:
       cli                             # disable interrupts
       movw    $0xfcf8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml11                  # mask off all but irq0-1,8-10
_iml11:
       cli                             # disable interrupts
       movw    $0xf8f8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml12                  # mask off all but irq0-1,8-11
_iml12:
       cli                             # disable interrupts
       movw    $0xf0f8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml13                  # mask off all but irq0-1,8-12
_iml13:
       cli                             # disable interrupts
       movw    $0xe0f8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml14                  # mask off all but irq0-1,8-13
       .globl  _splbio 
_iml14:
_splbio:
       cli                             # disable interrupts
       movw    $0xc0f8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
#       sti                             # enable interrupts
       ret

       .globl  _iml15                  # mask off all but irq0-1,8-14
_iml15:
       cli                             # disable interrupts
       movw    $0x80f8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml3                   # mask off all but irq0-1,8-15
_iml3:
       cli                             # disable interrupts
       movw    $0x00f8,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml4                   # mask off all but irq0-1,8-15,3
_iml4:
       cli                             # disable interrupts
       movw    $0x00f0,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml5                   # mask off all but irq0-1,8-15,3-4
_iml5:
       cli                             # disable interrupts
       movw    $0x00e0,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml6                   # mask off all but irq0-1,8-15,3-5
_iml6:
       cli                             # disable interrupts
       movw    $0x00c0,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl  _iml7,_splsoftclock     # mask off all but irq0-1,8-15,3-7
_iml7:
_splsoftclock:
       cli                             # disable interrupts
       movw    $0x0080,%ax             # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
#       sti                             # enable interrupts
       ret

       .globl _imlnone                 # masks off no interrupts
       .globl _splnone
       .globl _spl0
_imlnone:
_splnone:
_spl0:
       cli                             # disable interrupts
       movw    $0,%ax                  # set new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       sti                             # enable interrupts
       ret

       .globl _splx
_splx:
       cli                             # disable interrupts
       movw    4(%esp),%ax             # new priority level
       movw    %ax,%dx
       orw     _imen,%ax               # mask off those not enabled yet
       movw    %ax,%cx
       NOP
       outb    %al,$0x21               /* update icu's */
       NOP
       movb    %ah,%al
       NOP
       outb    %al,$0xA1
       NOP
       movzwl  _cpl,%eax               # return old priority
       movw    %dx,_cpl                # set new priority level
       cmpw    $0,%dx          # XXX
       jne     1f              # XXX
       sti                             # enable interrupts
1:
       ret