Source to arch/i386/isa/icu.s


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/*-
 * 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
 */

/*
 * AT/386
 * Vector interrupt control section
 */

	.data
	.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
_isa_intr:	.space	16*4

	.text
/*
 * Handle return from interrupt after device handler finishes
 */
doreti:
	cli
	popl	%ebx			# remove intr number
	popl	%eax			# get previous priority
	# now interrupt frame is a trap frame!
	movw	%ax,%cx
	movw	%ax,_cpl
	orw	_imen,%ax
	NOP
	outb	%al,$ IO_ICU1+1		# re-enable intr?
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al

	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

1:	cmpl	$0,_netisr		# check for softint s/traps
	jne	1f

	pop	%es			# none, going back to base pri
	pop	%ds
	popa
	addl	$8,%esp
	iret
	
#include "../net/netisr.h"

1:

#define DONET(s, c)	; \
	.globl	c ;  \
	movl	$ s ,%eax ; 	\
	btrl	%eax,_netisr ;  \
	jnb	1f ; \
	call	c ; \
1:

	call	_splnet
	pushl	%eax

	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

	popl	%eax
	movw	%ax,_cpl
	orw	_imen,%ax
	NOP
	outb	%al,$ IO_ICU1+1		# re-enable intr?
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al

	# btrl	$ NETISR_SCLK,_netisr
	movl	$ NETISR_SCLK,%eax	# stupid assembler, as usual
	btrl	%eax,_netisr
	jnb	1f
	# back to an interrupt frame for a moment
	call	_splsoftclock
	pushl	%eax
	pushl	$0xff	# dummy intr
	call	_softclock
	popl	%eax
	call	_splx
	popl	%eax

	jmp	2f

	/* 1:	btrl	$NETISR_AST,_netisr*/
1:
	cmpw	$0x1f,13*4(%esp)	# to user?
	jne	2f			# nope, leave
	movl	$ NETISR_AST,%eax	# stupid assembler, as usual
	btrl	%eax,_netisr
	jnb	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
_splhigh:
_splclock:
	cli				# disable interrupts
	movw	$0xffff,%ax		# set new priority level
	movw	%ax,%dx
	# orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	movzwl	_cpl,%eax		# return old priority
	movw	%dx,_cpl		# set new priority level
	sti				# enable interrupts
	ret

	.globl	_spltty			# block clists
_spltty:
	cli				# disable interrupts
	movw	_cpl,%ax
	orw	_ttymask,%ax
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	movzwl	_cpl,%eax		# return old priority
	movw	%dx,_cpl		# set new priority level
	sti				# enable interrupts
	ret

	.globl	_splimp
	.globl	_splnet
_splimp:
_splnet:
	cli				# disable interrupts
	movw	_cpl,%ax
	orw	_netmask,%ax
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	movzwl	_cpl,%eax		# return old priority
	movw	%dx,_cpl		# set new priority level
	sti				# enable interrupts
	ret

	.globl	_splbio	
_splbio:
	cli				# disable interrupts
	movw	_cpl,%ax
	orw	_biomask,%ax
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	movzwl	_cpl,%eax		# return old priority
	movw	%dx,_cpl		# set new priority level
	sti				# enable interrupts
	ret

	.globl	_splsoftclock
_splsoftclock:
	cli				# disable interrupts
	movw	_cpl,%ax
	orw	$0x8000,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	movzwl	_cpl,%eax		# return old priority
	movw	%dx,_cpl		# set new priority level
	sti				# enable interrupts
	ret

	.globl _splnone
	.globl _spl0
_splnone:
_spl0:
	cli				# disable interrupts
	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
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	sti				# enable interrupts

	DONET(NETISR_RAW,_rawintr)
#ifdef INET
	DONET(NETISR_IP,_ipintr)
#endif
	cli				# disable interrupts
	popl	_cpl			# save old priority
	movw	$0,%ax			# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	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
	cmpw	$0,%dx
	je	_spl0			# going to "zero level" is special

	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	inb	$0x84,%al
	movzwl	_cpl,%eax		# return old priority
	movw	%dx,_cpl		# set new priority level
	sti				# enable interrupts
	ret

#ifdef notyet
	.globl	_iml8			# mask off all but irq0-1
_iml8:
	cli				# disable interrupts
	movw	$0xfffc,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0xfcf8,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0xf8f8,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0xf0f8,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0xe0f8,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0x80f8,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0x00f8,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0x00f0,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0x00e0,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	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	$0x00c0,%ax		# set new priority level
	movw	%ax,%dx
	orw	_imen,%ax		# mask off those not enabled yet
	movw	%ax,%cx
	NOP
	outb	%al,$ IO_ICU1+1		/* update icu's */
	NOP
	movb	%ah,%al
	NOP
	outb	%al,$ IO_ICU2+1
	NOP
	movzwl	_cpl,%eax		# return old priority
	movw	%dx,_cpl		# set new priority level
	sti				# enable interrupts
	ret

#endif	notyet

	/* hardware interrupt catcher (IDT 32 - 47) */
	.globl	_isa_strayintr

IDTVEC(intr0)
	INTR(0, _highmask, 0) ; call	_isa_strayintr ; INTREXIT1

IDTVEC(intr1)
	INTR(1, _highmask, 1) ; call	_isa_strayintr ; INTREXIT1

IDTVEC(intr2)
	INTR(2, _highmask, 2) ; call	_isa_strayintr ; INTREXIT1

IDTVEC(intr3)
	INTR(3, _highmask, 3) ; call	_isa_strayintr ; INTREXIT1

IDTVEC(intr4)
	INTR(4, _highmask, 4) ; call	_isa_strayintr ; INTREXIT1

IDTVEC(intr5)
	INTR(5, _highmask, 5) ; call	_isa_strayintr ; INTREXIT1

IDTVEC(intr6)
	INTR(6, _highmask, 6) ; call	_isa_strayintr ; INTREXIT1

IDTVEC(intr7)
	INTR(7, _highmask, 7) ; call	_isa_strayintr ; INTREXIT1


IDTVEC(intr8)
	INTR(8, _highmask, 8) ; call	_isa_strayintr ; INTREXIT2

IDTVEC(intr9)
	INTR(9, _highmask, 9) ; call	_isa_strayintr ; INTREXIT2

IDTVEC(intr10)
	INTR(10, _highmask, 10) ; call	_isa_strayintr ; INTREXIT2

IDTVEC(intr11)
	INTR(11, _highmask, 11) ; call	_isa_strayintr ; INTREXIT2

IDTVEC(intr12)
	INTR(12, _highmask, 12) ; call	_isa_strayintr ; INTREXIT2

IDTVEC(intr13)
	INTR(13, _highmask, 13) ; call	_isa_strayintr ; INTREXIT2

IDTVEC(intr14)
	INTR(14, _highmask, 14) ; call	_isa_strayintr ; INTREXIT2

IDTVEC(intr15)
	INTR(15, _highmask, 15) ; call	_isa_strayintr ; INTREXIT2