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/*-
* Copyright (c) 1997, by Steve Passe
* All rights reserved.
*
* 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. The name of the developer may NOT be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
.data
ALIGN_DATA
/*
* Note:
* This is the UP equivilant of _imen.
* It is OPAQUE, and must NOT be accessed directly.
* It MUST be accessed along with the IO APIC as a 'critical region'.
* Accessed by:
* INTREN()
* INTRDIS()
* imen_dump()
*/
.p2align 2 /* MUST be 32bit aligned */
.globl _apic_imen
_apic_imen:
.long HWI_MASK
.text
SUPERALIGN_TEXT
/******************************************************************************
* XXX FIXME: figure out where these belong.
*/
/* this nonsense is to verify that masks ALWAYS have 1 and only 1 bit set */
#define QUALIFY_MASKS_NOT
#ifdef QUALIFY_MASKS
#define QUALIFY_MASK \
btrl %ecx, %eax ; \
andl %eax, %eax ; \
jz 1f ; \
pushl $bad_mask ; \
call _panic ; \
1:
bad_mask: .asciz "bad mask"
#else
#define QUALIFY_MASK
#endif
/*
* (soon to be) MP-safe function to clear ONE INT mask bit.
* The passed arg is a 32bit u_int MASK.
* It sets the associated bit in _apic_imen.
* It sets the mask bit of the associated IO APIC register.
*/
ENTRY(INTREN)
pushfl /* save state of EI flag */
cli /* prevent recursion */
IMASK_LOCK /* enter critical reg */
movl 8(%esp), %eax /* mask into %eax */
bsfl %eax, %ecx /* get pin index */
btrl %ecx, _apic_imen /* update _apic_imen */
QUALIFY_MASK
shll $4, %ecx
movl CNAME(int_to_apicintpin) + 8(%ecx), %edx
movl CNAME(int_to_apicintpin) + 12(%ecx), %ecx
testl %edx, %edx
jz 1f
movl %ecx, (%edx) /* write the target register index */
movl 16(%edx), %eax /* read the target register data */
andl $~IOART_INTMASK, %eax /* clear mask bit */
movl %eax, 16(%edx) /* write the APIC register data */
1:
IMASK_UNLOCK /* exit critical reg */
popfl /* restore old state of EI flag */
ret
/*
* (soon to be) MP-safe function to set ONE INT mask bit.
* The passed arg is a 32bit u_int MASK.
* It clears the associated bit in _apic_imen.
* It clears the mask bit of the associated IO APIC register.
*/
ENTRY(INTRDIS)
pushfl /* save state of EI flag */
cli /* prevent recursion */
IMASK_LOCK /* enter critical reg */
movl 8(%esp), %eax /* mask into %eax */
bsfl %eax, %ecx /* get pin index */
btsl %ecx, _apic_imen /* update _apic_imen */
QUALIFY_MASK
shll $4, %ecx
movl CNAME(int_to_apicintpin) + 8(%ecx), %edx
movl CNAME(int_to_apicintpin) + 12(%ecx), %ecx
testl %edx, %edx
jz 1f
movl %ecx, (%edx) /* write the target register index */
movl 16(%edx), %eax /* read the target register data */
orl $IOART_INTMASK, %eax /* set mask bit */
movl %eax, 16(%edx) /* write the APIC register data */
1:
IMASK_UNLOCK /* exit critical reg */
popfl /* restore old state of EI flag */
ret
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