353 lines
9.5 KiB
ArmAsm
353 lines
9.5 KiB
ArmAsm
/*-
|
|
* 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
|
|
*
|
|
* $Id: icu.s,v 1.23 1995/07/05 14:35:34 bde Exp $
|
|
*/
|
|
|
|
/*
|
|
* AT/386
|
|
* Vector interrupt control section
|
|
*/
|
|
|
|
/*
|
|
* XXX this file should be named ipl.s. All spls are now soft and the
|
|
* only thing related to the hardware icu is that the h/w interrupt
|
|
* numbers are used without translation in the masks.
|
|
*/
|
|
|
|
.data
|
|
.globl _cpl
|
|
_cpl: .long HWI_MASK | SWI_MASK /* current priority (all off) */
|
|
.globl _imen
|
|
_imen: .long HWI_MASK /* interrupt mask enable (all h/w off) */
|
|
.globl _tty_imask
|
|
_tty_imask: .long 0
|
|
.globl _bio_imask
|
|
_bio_imask: .long 0
|
|
.globl _net_imask
|
|
_net_imask: .long 0
|
|
.globl _ipending
|
|
_ipending: .long 0
|
|
.globl _netisr
|
|
_netisr: .long 0 /* set with bits for which queue to service */
|
|
.globl _netisrs
|
|
_netisrs:
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
.long dummynetisr, dummynetisr, dummynetisr, dummynetisr
|
|
vec:
|
|
.long vec0, vec1, vec2, vec3, vec4, vec5, vec6, vec7
|
|
.long vec8, vec9, vec10, vec11, vec12, vec13, vec14, vec15
|
|
|
|
.text
|
|
|
|
/*
|
|
* Handle return from interrupts, traps and syscalls.
|
|
*/
|
|
SUPERALIGN_TEXT
|
|
_doreti:
|
|
FAKE_MCOUNT(_bintr) /* init "from" _bintr -> _doreti */
|
|
addl $4,%esp /* discard unit number */
|
|
popl %eax /* cpl to restore */
|
|
doreti_next:
|
|
/*
|
|
* Check for pending HWIs and SWIs atomically with restoring cpl
|
|
* and exiting. The check has to be atomic with exiting to stop
|
|
* (ipending & ~cpl) changing from zero to nonzero while we're
|
|
* looking at it (this wouldn't be fatal but it would increase
|
|
* interrupt latency). Restoring cpl has to be atomic with exiting
|
|
* so that the stack cannot pile up (the nesting level of interrupt
|
|
* handlers is limited by the number of bits in cpl).
|
|
*/
|
|
movl %eax,%ecx
|
|
notl %ecx
|
|
cli
|
|
andl _ipending,%ecx
|
|
jne doreti_unpend
|
|
doreti_exit:
|
|
movl %eax,_cpl
|
|
decb _intr_nesting_level
|
|
MEXITCOUNT
|
|
.globl doreti_popl_es
|
|
doreti_popl_es:
|
|
popl %es
|
|
.globl doreti_popl_ds
|
|
doreti_popl_ds:
|
|
popl %ds
|
|
popal
|
|
addl $8,%esp
|
|
.globl doreti_iret
|
|
doreti_iret:
|
|
iret
|
|
|
|
ALIGN_TEXT
|
|
.globl doreti_iret_fault
|
|
doreti_iret_fault:
|
|
subl $8,%esp
|
|
pushal
|
|
pushl %ds
|
|
.globl doreti_popl_ds_fault
|
|
doreti_popl_ds_fault:
|
|
pushl %es
|
|
.globl doreti_popl_es_fault
|
|
doreti_popl_es_fault:
|
|
movl $0,4+4+32+4(%esp) /* XXX should be the error code */
|
|
movl $T_PROTFLT,4+4+32+0(%esp)
|
|
jmp alltraps_with_regs_pushed
|
|
|
|
ALIGN_TEXT
|
|
doreti_unpend:
|
|
/*
|
|
* Enabling interrupts is safe because we haven't restored cpl yet.
|
|
* The locking from the "btrl" test is probably no longer necessary.
|
|
* We won't miss any new pending interrupts because we will check
|
|
* for them again.
|
|
*/
|
|
sti
|
|
bsfl %ecx,%ecx /* slow, but not worth optimizing */
|
|
btrl %ecx,_ipending
|
|
jnc doreti_next /* some intr cleared memory copy */
|
|
movl ihandlers(,%ecx,4),%edx
|
|
testl %edx,%edx
|
|
je doreti_next /* "can't happen" */
|
|
cmpl $NHWI,%ecx
|
|
jae doreti_swi
|
|
cli
|
|
movl %eax,_cpl
|
|
MEXITCOUNT
|
|
jmp %edx
|
|
|
|
ALIGN_TEXT
|
|
doreti_swi:
|
|
pushl %eax
|
|
/*
|
|
* The SWI_AST handler has to run at cpl = SWI_AST_MASK and the
|
|
* SWI_CLOCK handler at cpl = SWI_CLOCK_MASK, so we have to restore
|
|
* all the h/w bits in cpl now and have to worry about stack growth.
|
|
* The worst case is currently (30 Jan 1994) 2 SWI handlers nested
|
|
* in dying interrupt frames and about 12 HWIs nested in active
|
|
* interrupt frames. There are only 4 different SWIs and the HWI
|
|
* and SWI masks limit the nesting further.
|
|
*/
|
|
orl imasks(,%ecx,4),%eax
|
|
movl %eax,_cpl
|
|
call %edx
|
|
popl %eax
|
|
jmp doreti_next
|
|
|
|
ALIGN_TEXT
|
|
swi_ast:
|
|
addl $8,%esp /* discard raddr & cpl to get trap frame */
|
|
testb $SEL_RPL_MASK,TRAPF_CS_OFF(%esp)
|
|
je swi_ast_phantom
|
|
movl $T_ASTFLT,(2+8+0)*4(%esp)
|
|
call _trap
|
|
subl %eax,%eax /* recover cpl */
|
|
jmp doreti_next
|
|
|
|
ALIGN_TEXT
|
|
swi_ast_phantom:
|
|
/*
|
|
* These happen when there is an interrupt in a trap handler before
|
|
* ASTs can be masked or in an lcall handler before they can be
|
|
* masked or after they are unmasked. They could be avoided for
|
|
* trap entries by using interrupt gates, and for lcall exits by
|
|
* using by using cli, but they are unavoidable for lcall entries.
|
|
*/
|
|
cli
|
|
orl $SWI_AST_PENDING,_ipending
|
|
subl %eax,%eax
|
|
jmp doreti_exit /* SWI_AST is highest so we must be done */
|
|
|
|
/*
|
|
* Interrupt priority mechanism
|
|
* -- soft splXX masks with group mechanism (cpl)
|
|
* -- h/w masks for currently active or unused interrupts (imen)
|
|
* -- ipending = active interrupts currently masked by cpl
|
|
*/
|
|
|
|
ENTRY(splz)
|
|
/*
|
|
* The caller has restored cpl and checked that (ipending & ~cpl)
|
|
* is nonzero. We have to repeat the check since if there is an
|
|
* interrupt while we're looking, _doreti processing for the
|
|
* interrupt will handle all the unmasked pending interrupts
|
|
* because we restored early. We're repeating the calculation
|
|
* of (ipending & ~cpl) anyway so that the caller doesn't have
|
|
* to pass it, so this only costs one "jne". "bsfl %ecx,%ecx"
|
|
* is undefined when %ecx is 0 so we can't rely on the secondary
|
|
* btrl tests.
|
|
*/
|
|
movl _cpl,%eax
|
|
splz_next:
|
|
/*
|
|
* We don't need any locking here. (ipending & ~cpl) cannot grow
|
|
* while we're looking at it - any interrupt will shrink it to 0.
|
|
*/
|
|
movl %eax,%ecx
|
|
notl %ecx
|
|
andl _ipending,%ecx
|
|
jne splz_unpend
|
|
ret
|
|
|
|
ALIGN_TEXT
|
|
splz_unpend:
|
|
bsfl %ecx,%ecx
|
|
btrl %ecx,_ipending
|
|
jnc splz_next
|
|
movl ihandlers(,%ecx,4),%edx
|
|
testl %edx,%edx
|
|
je splz_next /* "can't happen" */
|
|
cmpl $NHWI,%ecx
|
|
jae splz_swi
|
|
/*
|
|
* We would prefer to call the intr handler directly here but that
|
|
* doesn't work for badly behaved handlers that want the interrupt
|
|
* frame. Also, there's a problem determining the unit number.
|
|
* We should change the interface so that the unit number is not
|
|
* determined at config time.
|
|
*/
|
|
jmp *vec(,%ecx,4)
|
|
|
|
ALIGN_TEXT
|
|
splz_swi:
|
|
cmpl $SWI_AST,%ecx
|
|
je splz_next /* "can't happen" */
|
|
pushl %eax
|
|
orl imasks(,%ecx,4),%eax
|
|
movl %eax,_cpl
|
|
call %edx
|
|
popl %eax
|
|
movl %eax,_cpl
|
|
jmp splz_next
|
|
|
|
/*
|
|
* Fake clock interrupt(s) so that they appear to come from our caller instead
|
|
* of from here, so that system profiling works.
|
|
* XXX do this more generally (for all vectors; look up the C entry point).
|
|
* XXX frame bogusness stops us from just jumping to the C entry point.
|
|
*/
|
|
ALIGN_TEXT
|
|
vec0:
|
|
popl %eax /* return address */
|
|
pushfl
|
|
#define KCSEL 8
|
|
pushl $KCSEL
|
|
pushl %eax
|
|
cli
|
|
MEXITCOUNT
|
|
jmp _Xintr0 /* XXX might need _Xfastintr0 */
|
|
|
|
ALIGN_TEXT
|
|
vec8:
|
|
popl %eax
|
|
pushfl
|
|
pushl $KCSEL
|
|
pushl %eax
|
|
cli
|
|
MEXITCOUNT
|
|
jmp _Xintr8 /* XXX might need _Xfastintr8 */
|
|
|
|
#define BUILD_VEC(irq_num) \
|
|
ALIGN_TEXT ; \
|
|
vec/**/irq_num: ; \
|
|
int $ICU_OFFSET + (irq_num) ; \
|
|
ret
|
|
|
|
BUILD_VEC(1)
|
|
BUILD_VEC(2)
|
|
BUILD_VEC(3)
|
|
BUILD_VEC(4)
|
|
BUILD_VEC(5)
|
|
BUILD_VEC(6)
|
|
BUILD_VEC(7)
|
|
BUILD_VEC(9)
|
|
BUILD_VEC(10)
|
|
BUILD_VEC(11)
|
|
BUILD_VEC(12)
|
|
BUILD_VEC(13)
|
|
BUILD_VEC(14)
|
|
BUILD_VEC(15)
|
|
|
|
ALIGN_TEXT
|
|
swi_net:
|
|
MCOUNT
|
|
bsfl _netisr,%eax
|
|
je swi_net_done
|
|
swi_net_more:
|
|
btrl %eax,_netisr
|
|
jnc swi_net_next
|
|
call *_netisrs(,%eax,4)
|
|
swi_net_next:
|
|
bsfl _netisr,%eax
|
|
jne swi_net_more
|
|
swi_net_done:
|
|
ret
|
|
|
|
ALIGN_TEXT
|
|
dummynetisr:
|
|
MCOUNT
|
|
ret
|
|
|
|
/*
|
|
* XXX there should be a registration function to put the handler for the
|
|
* attached driver directly in ihandlers. Then this function will go away.
|
|
*/
|
|
ALIGN_TEXT
|
|
swi_tty:
|
|
MCOUNT
|
|
#include "cy.h"
|
|
#if NCY > 0
|
|
call _cypoll
|
|
#endif
|
|
#include "rc.h"
|
|
#if NRC > 0
|
|
call _rcpoll
|
|
#endif
|
|
#include "sio.h"
|
|
#if NSIO > 0
|
|
jmp _siopoll
|
|
#else
|
|
ret
|
|
#endif
|