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NetBSD/sys/arch/i386/isa/vector.s

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/*
* Copyright (c) 1993, 1994 Charles Hannum. 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. 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 Charles Hannum.
* 4. The name of the author 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 ``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 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.
*
* $Id: vector.s,v 1.17 1994/04/18 22:23:32 mycroft Exp $
*/
#include <i386/isa/icu.h>
#include <i386/isa/isa.h>
/*
* These macros are fairly self explanatory. If SPECIAL_MASK_MODE is defined,
* we try to take advantage of the ICU's `special mask mode' by only EOIing
* the interrupts on return. This avoids the requirement of masking and
* unmasking. We can't do this without special mask mode, because the ICU
* would also hold interrupts that it thinks are of lower priority.
*
* Many machines do not support special mask mode, so by default we don't try
* to use it.
*/
#define IRQ_BIT(irq_num) (1 << ((irq_num) % 8))
#define IRQ_BYTE(irq_num) ((irq_num) / 8)
#ifdef SPECIAL_MASK_MODE
#define ENABLE_ICU1(irq_num)
#define ENABLE_ICU1_AND_2(irqnum) \
movb $(0x60|2),%al /* specific EOI for IRQ2 */ ;\
outb %al,$IO_ICU1
#define MASK(irq_num, icu)
#define UNMASK(irq_num, icu) \
movb $(0x60|(irq_num%8)),%al /* specific EOI */ ;\
outb %al,$icu
#else /* SPECIAL_MASK_MODE */
#ifndef AUTO_EOI_1
#define ENABLE_ICU1(irq_num) \
movb $(0x60|(irq_num%8)),%al /* specific EOI */ ;\
outb %al,$IO_ICU1
#else
#define ENABLE_ICU1(irq_num)
#endif
#ifndef AUTO_EOI_2
#define ENABLE_ICU1_AND_2(irq_num) \
movb $(0x60|(irq_num%8)),%al /* specific EOI */ ;\
outb %al,$IO_ICU2 /* do the second ICU first */ ;\
movb $(0x60|2),%al /* specific EOI for IRQ2 */ ;\
outb %al,$IO_ICU1
#else
#define ENABLE_ICU1_AND_2(irq_num)
#endif
#define MASK(irq_num, icu) \
movb _imen + IRQ_BYTE(irq_num),%al ;\
orb $IRQ_BIT(irq_num),%al ;\
movb %al,_imen + IRQ_BYTE(irq_num) ;\
FASTER_NOP ;\
outb %al,$(icu+1)
#define UNMASK(irq_num, icu) \
cli ;\
movb _imen + IRQ_BYTE(irq_num),%al ;\
andb $~IRQ_BIT(irq_num),%al ;\
movb %al,_imen + IRQ_BYTE(irq_num) ;\
FASTER_NOP ;\
outb %al,$(icu+1) ;\
sti
#endif /* SPECIAL_MASK_MODE */
/*
* Macros for interrupt entry, call to handler, and exit.
*
* XXX
* The interrupt frame is set up to look like a trap frame. This may be a
* waste. The only handler which needs a frame is the clock handler, and it
* only needs a few bits. doreti() needs a trap frame for handling ASTs, but
* it could easily convert the frame on demand.
*
* The direct costs of setting up a trap frame are two pushl's (error code and
* trap number), an addl to get rid of these, and pushing and popping the
* callee-saved registers %esi, %edi, %ebx, and %ebp twice.
*
* If the interrupt frame is made more flexible, INTR can push %eax first and
* decide the ipending case with less overhead, e.g., by avoiding loading the
* segment registers.
*
* XXX
* Should we do a cld on every system entry to avoid the requirement for
* scattered cld's?
*/
.globl _isa_strayintr
/*
* Handle exceptions on vectors we don't expect.
*/
IDTVEC(wild)
sti
pushl $0 /* fake interrupt frame */
pushl $0
INTRENTRY
pushl $-1
call _isa_strayintr
addl $4,%esp
INTRFASTEXIT
/*
* Fast vectors.
*
* Like a normal vector, but run with all interrupts off. The handler is
* expected to be as fast as possible, and is expected to not change the
* interrupt flag. We pass an argument in like normal vectors, but we assume
* that a pointer to the frame is never required. There can be only one
* handler on a fast vector.
*
* XXX
* Note that we assume fast vectors don't do anything that would cause an AST
* or softintr; if so, it will be deferred until the next clock tick (or
* possibly sooner).
*/
#define FAST(irq_num, icu, enable_icus) \
IDTVEC(fast/**/irq_num) ;\
pushl %eax /* save call-used registers */ ;\
pushl %ecx ;\
pushl %edx ;\
pushl %ds ;\
pushl %es ;\
movl $KDSEL,%eax ;\
movl %ax,%ds ;\
movl %ax,%es ;\
/* have to do this here because %eax is lost on call */ ;\
movl _intrhand + (irq_num) * 4,%eax ;\
incl IH_COUNT(%eax) ;\
pushl IH_ARG(%eax) ;\
call IH_FUN(%eax) ;\
enable_icus(irq_num) ;\
addl $4,%esp ;\
incl _cnt+V_INTR /* statistical info */ ;\
popl %es ;\
popl %ds ;\
popl %edx ;\
popl %ecx ;\
popl %eax ;\
iret
FAST(0, IO_ICU1, ENABLE_ICU1)
FAST(1, IO_ICU1, ENABLE_ICU1)
FAST(2, IO_ICU1, ENABLE_ICU1)
FAST(3, IO_ICU1, ENABLE_ICU1)
FAST(4, IO_ICU1, ENABLE_ICU1)
FAST(5, IO_ICU1, ENABLE_ICU1)
FAST(6, IO_ICU1, ENABLE_ICU1)
FAST(7, IO_ICU1, ENABLE_ICU1)
FAST(8, IO_ICU2, ENABLE_ICU1_AND_2)
FAST(9, IO_ICU2, ENABLE_ICU1_AND_2)
FAST(10, IO_ICU2, ENABLE_ICU1_AND_2)
FAST(11, IO_ICU2, ENABLE_ICU1_AND_2)
FAST(12, IO_ICU2, ENABLE_ICU1_AND_2)
FAST(13, IO_ICU2, ENABLE_ICU1_AND_2)
FAST(14, IO_ICU2, ENABLE_ICU1_AND_2)
FAST(15, IO_ICU2, ENABLE_ICU1_AND_2)
/*
* Normal vectors.
*
* We cdr down the intrhand chain, calling each handler with its appropriate
* argument (0 meaning a pointer to the frame, for clock interrupts).
*
* The handler returns one of three values:
* 0 - This interrupt wasn't for me.
* 1 - This interrupt was for me.
* -1 - This interrupt might have been for me, but I don't know.
* If there are no handlers, or they all return 0, we flags it as a `stray'
* interrupt. On a system with level-triggered interrupts, we could terminate
* immediately when one of them returns 1; but this is a PC.
*
* On exit, we jump to doreti, to process soft interrupts and ASTs.
*/
#define INTR(irq_num, icu, enable_icus) \
IDTVEC(intr/**/irq_num) ;\
pushl $0 /* dummy error code */ ;\
pushl $T_ASTFLT /* trap # for doing ASTs */ ;\
INTRENTRY ;\
MASK(irq_num, icu) /* mask it in hardware */ ;\
enable_icus(irq_num) /* and allow other intrs */ ;\
testb $IRQ_BIT(irq_num),_cpl + IRQ_BYTE(irq_num) ;\
jnz _Xhold/**/irq_num /* currently masked; hold it */ ;\
_Xresume/**/irq_num/**/: ;\
movl _cpl,%eax /* cpl to restore on exit */ ;\
pushl %eax ;\
orl _intrmask + (irq_num) * 4,%eax ;\
movl %eax,_cpl /* add in this intr's mask */ ;\
sti /* safe to take intrs now */ ;\
movl _intrhand + (irq_num) * 4,%ebx /* head of chain */ ;\
testl %ebx,%ebx ;\
jz _Xstray/**/irq_num /* no handlears; we're stray */ ;\
STRAY_INITIALIZE ;\
7: movl IH_ARG(%ebx),%eax /* get handler arg */ ;\
testl %eax,%eax ;\
jnz 4f ;\
movl %esp,%eax /* 0 means frame pointer */ ;\
4: pushl %eax ;\
call IH_FUN(%ebx) /* call it */ ;\
addl $4,%esp /* toss the arg */ ;\
STRAY_INTEGRATE ;\
incl IH_COUNT(%ebx) /* count the intrs */ ;\
movl IH_NEXT(%ebx),%ebx /* next handler in chain */ ;\
testl %ebx,%ebx ;\
jnz 7b ;\
STRAY_TEST ;\
5: UNMASK(irq_num, icu) /* unmask it in hardware */ ;\
INTREXIT /* lower spl and do ASTs */ ;\
IDTVEC(stray/**/irq_num) ;\
pushl $irq_num ;\
call _isa_strayintr ;\
addl $4,%esp ;\
jmp 5b ;\
IDTVEC(hold/**/irq_num) ;\
orb $IRQ_BIT(irq_num),_ipending + IRQ_BYTE(irq_num) ;\
INTRFASTEXIT
#ifdef DEBUG
#define STRAY_INITIALIZE \
xorl %esi,%esi /* nobody claimed it yet */
#define STRAY_INTEGRATE \
orl %eax,%esi /* maybe he claimed it */
#define STRAY_TEST \
testl %esi,%esi /* no more handlers */ ;\
jz _Xstray/**/irq_num /* nobody claimed it */
#else
#define STRAY_INITIALIZE
#define STRAY_INTEGRATE
#define STRAY_TEST
#endif /* DEBUG */
INTR(0, IO_ICU1, ENABLE_ICU1)
INTR(1, IO_ICU1, ENABLE_ICU1)
INTR(2, IO_ICU1, ENABLE_ICU1)
INTR(3, IO_ICU1, ENABLE_ICU1)
INTR(4, IO_ICU1, ENABLE_ICU1)
INTR(5, IO_ICU1, ENABLE_ICU1)
INTR(6, IO_ICU1, ENABLE_ICU1)
INTR(7, IO_ICU1, ENABLE_ICU1)
INTR(8, IO_ICU2, ENABLE_ICU1_AND_2)
INTR(9, IO_ICU2, ENABLE_ICU1_AND_2)
INTR(10, IO_ICU2, ENABLE_ICU1_AND_2)
INTR(11, IO_ICU2, ENABLE_ICU1_AND_2)
INTR(12, IO_ICU2, ENABLE_ICU1_AND_2)
INTR(13, IO_ICU2, ENABLE_ICU1_AND_2)
INTR(14, IO_ICU2, ENABLE_ICU1_AND_2)
INTR(15, IO_ICU2, ENABLE_ICU1_AND_2)
/*
* Recursive interrupts.
*
* This is a somewhat nasty hack to deal with resuming interrupts from splx().
* We can't just jump to the resume point, because some handlers require an
* interrupt frame. Instead, we just recursively interrupt.
*
* On entry, %esi contains a pointer to where we need to return. This is a
* bit faster than a call/ret/jmp to continue the loop.
*
* XXX
* It might be a little faster to build the interrupt frame manually and jump
* to the resume point. The code would be larger, though.
*/
#define RECURSE(irq_num) \
IDTVEC(recurse/**/irq_num) ;\
int $(ICU_OFFSET + irq_num) ;\
jmp %esi
RECURSE(0)
RECURSE(1)
RECURSE(2)
RECURSE(3)
RECURSE(4)
RECURSE(5)
RECURSE(6)
RECURSE(7)
RECURSE(8)
RECURSE(9)
RECURSE(10)
RECURSE(11)
RECURSE(12)
RECURSE(13)
RECURSE(14)
RECURSE(15)
/*
* These tables are used by the ISA configuration code.
*/
/* interrupt service routine entry points */
IDTVEC(intr)
.long _Xintr0, _Xintr1, _Xintr2, _Xintr3, _Xintr4, _Xintr5, _Xintr6
.long _Xintr7, _Xintr8, _Xintr9, _Xintr10, _Xintr11, _Xintr12
.long _Xintr13, _Xintr14, _Xintr15
/* fast interrupt routine entry points */
IDTVEC(fast)
.long _Xfast0, _Xfast1, _Xfast2, _Xfast3, _Xfast4, _Xfast5, _Xfast6
.long _Xfast7, _Xfast8, _Xfast9, _Xfast10, _Xfast11, _Xfast12
.long _Xfast13, _Xfast14, _Xfast15
/*
* These tables are used by doreti() and spllower().
*/
/* resume points for suspended interrupts */
IDTVEC(resume)
.long _Xresume0, _Xresume1, _Xresume2, _Xresume3, _Xresume4
.long _Xresume5, _Xresume6, _Xresume7, _Xresume8, _Xresume9
.long _Xresume10, _Xresume11, _Xresume12, _Xresume13, _Xresume14
.long _Xresume15
/* for soft interrupts */
.long 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.long _Xsofttty, _Xsoftnet, _Xsoftclock
/* fake interrupts to resume from splx() */
IDTVEC(recurse)
.long _Xrecurse0, _Xrecurse1, _Xrecurse2, _Xrecurse3, _Xrecurse4
.long _Xrecurse5, _Xrecurse6, _Xrecurse7, _Xrecurse8, _Xrecurse9
.long _Xrecurse10, _Xrecurse11, _Xrecurse12, _Xrecurse13, _Xrecurse14
.long _Xrecurse15
/* for soft interrupts */
.long 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.long _Xsofttty, _Xsoftnet, _Xsoftclock
/* Some bogus data, to keep vmstat happy, for now. */
.globl _intrnames, _eintrnames, _intrcnt, _eintrcnt
_intrnames:
.long 0
_eintrnames:
_intrcnt:
.long 0
_eintrcnt:
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