/* $OpenBSD: vector.s,v 1.16 2003/04/17 03:42:14 drahn Exp $ */ /* $NetBSD: vector.s,v 1.32 1996/01/07 21:29:47 mycroft Exp $ */ /* * Copyright (c) 1993, 1994, 1995 Charles M. 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 M. 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. */ #include #include #define ICU_HARDWARE_MASK #define MY_COUNT _C_LABEL(uvmexp) /* * These macros are fairly self explanatory. If ICU_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 ICU_SPECIAL_MASK_MODE #define ACK1(irq_num) #define ACK2(irq_num) \ movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\ outb %al,$IO_ICU1 #define MASK(irq_num, icu) #define UNMASK(irq_num, icu) \ movb $(0x60|(irq_num%8)),%al /* specific EOI */ ;\ outb %al,$icu #else /* ICU_SPECIAL_MASK_MODE */ #ifndef AUTO_EOI_1 #define ACK1(irq_num) \ movb $(0x60|(irq_num%8)),%al /* specific EOI */ ;\ outb %al,$IO_ICU1 #else #define ACK1(irq_num) #endif #ifndef AUTO_EOI_2 #define ACK2(irq_num) \ movb $(0x60|(irq_num%8)),%al /* specific EOI */ ;\ outb %al,$IO_ICU2 /* do the second ICU first */ ;\ movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\ outb %al,$IO_ICU1 #else #define ACK2(irq_num) #endif #ifdef ICU_HARDWARE_MASK #define MASK(irq_num, icu) \ movb _C_LABEL(imen) + IRQ_BYTE(irq_num),%al ;\ orb $IRQ_BIT(irq_num),%al ;\ movb %al,_C_LABEL(imen) + IRQ_BYTE(irq_num) ;\ FASTER_NOP ;\ outb %al,$(icu+1) #define UNMASK(irq_num, icu) \ cli ;\ movb _C_LABEL(imen) + IRQ_BYTE(irq_num),%al ;\ andb $~IRQ_BIT(irq_num),%al ;\ movb %al,_C_LABEL(imen) + IRQ_BYTE(irq_num) ;\ FASTER_NOP ;\ outb %al,$(icu+1) ;\ sti #else /* ICU_HARDWARE_MASK */ #define MASK(irq_num, icu) #define UNMASK(irq_num, icu) #endif /* ICU_HARDWARE_MASK */ #endif /* ICU_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. Xdoreti() 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 _C_LABEL(isa_strayintr) /* * 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 Xdoreti(), to process soft interrupts and ASTs. */ #define INTR(irq_num, icu, ack) \ IDTVEC(recurse/**/irq_num) ;\ pushfl ;\ pushl %cs ;\ pushl %esi ;\ cli ;\ _C_LABEL(Xintr)/**/irq_num/**/: ;\ pushl $0 /* dummy error code */ ;\ pushl $T_ASTFLT /* trap # for doing ASTs */ ;\ INTRENTRY ;\ MAKE_FRAME ;\ MASK(irq_num, icu) /* mask it in hardware */ ;\ ack(irq_num) /* and allow other intrs */ ;\ incl MY_COUNT+V_INTR /* statistical info */ ;\ movl _C_LABEL(iminlevel) + (irq_num) * 4, %eax ;\ movzbl _C_LABEL(cpl),%ebx ;\ cmpl %eax,%ebx ;\ jae _C_LABEL(Xhold/**/irq_num)/* currently masked; hold it */;\ _C_LABEL(Xresume)/**/irq_num/**/: ;\ movzbl _C_LABEL(cpl),%eax /* cpl to restore on exit */ ;\ pushl %eax ;\ movl _C_LABEL(imaxlevel) + (irq_num) * 4,%eax ;\ movl %eax,_C_LABEL(cpl) /* block enough for this irq */ ;\ sti /* safe to take intrs now */ ;\ movl _C_LABEL(intrhand) + (irq_num) * 4,%ebx /* head of chain */ ;\ testl %ebx,%ebx ;\ jz _C_LABEL(Xstray)/**/irq_num /* no handlears; we're stray */ ;\ STRAY_INITIALIZE /* nobody claimed it yet */ ;\ 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 /* maybe he claimed it */ ;\ orl %eax,%eax /* should it be counted? */ ;\ jz 5f /* no, skip it */ ;\ incl IH_COUNT(%ebx) /* count the intrs */ ;\ 5: movl IH_NEXT(%ebx),%ebx /* next handler in chain */ ;\ testl %ebx,%ebx ;\ jnz 7b ;\ STRAY_TEST /* see if it's a stray */ ;\ 6: UNMASK(irq_num, icu) /* unmask it in hardware */ ;\ jmp _C_LABEL(Xdoreti) /* lower spl and do ASTs */ ;\ IDTVEC(stray/**/irq_num) ;\ pushl $irq_num ;\ call _C_LABEL(isa_strayintr) ;\ addl $4,%esp ;\ jmp 6b ;\ IDTVEC(hold/**/irq_num) ;\ orb $IRQ_BIT(irq_num),_C_LABEL(ipending) + IRQ_BYTE(irq_num) ;\ INTRFASTEXIT #if defined(DEBUG) && defined(notdef) #define STRAY_INITIALIZE \ xorl %esi,%esi #define STRAY_INTEGRATE \ orl %eax,%esi #define STRAY_TEST \ testl %esi,%esi ;\ jz _C_LABEL(Xstray)/**/irq_num #else /* !DEBUG */ #define STRAY_INITIALIZE #define STRAY_INTEGRATE #define STRAY_TEST #endif /* DEBUG */ #ifdef DDB #define MAKE_FRAME \ leal -8(%esp),%ebp #else /* !DDB */ #define MAKE_FRAME #endif /* DDB */ INTR(0, IO_ICU1, ACK1) INTR(1, IO_ICU1, ACK1) INTR(2, IO_ICU1, ACK1) INTR(3, IO_ICU1, ACK1) INTR(4, IO_ICU1, ACK1) INTR(5, IO_ICU1, ACK1) INTR(6, IO_ICU1, ACK1) INTR(7, IO_ICU1, ACK1) INTR(8, IO_ICU2, ACK2) INTR(9, IO_ICU2, ACK2) INTR(10, IO_ICU2, ACK2) INTR(11, IO_ICU2, ACK2) INTR(12, IO_ICU2, ACK2) INTR(13, IO_ICU2, ACK2) INTR(14, IO_ICU2, ACK2) INTR(15, IO_ICU2, ACK2) /* * These tables are used by the ISA configuration code. */ /* interrupt service routine entry points */ IDTVEC(intr) .long _C_LABEL(Xintr0), _C_LABEL(Xintr1), _C_LABEL(Xintr2) .long _C_LABEL(Xintr3), _C_LABEL(Xintr4), _C_LABEL(Xintr5) .long _C_LABEL(Xintr6), _C_LABEL(Xintr7), _C_LABEL(Xintr8) .long _C_LABEL(Xintr9), _C_LABEL(Xintr10), _C_LABEL(Xintr11) .long _C_LABEL(Xintr12), _C_LABEL(Xintr13) .long _C_LABEL(Xintr14), _C_LABEL(Xintr15) /* * These tables are used by Xdoreti() and Xspllower(). */ /* resume points for suspended interrupts */ IDTVEC(resume) .long _C_LABEL(Xresume0), _C_LABEL(Xresume1) .long _C_LABEL(Xresume2), _C_LABEL(Xresume3) .long _C_LABEL(Xresume4), _C_LABEL(Xresume5) .long _C_LABEL(Xresume6), _C_LABEL(Xresume7) .long _C_LABEL(Xresume8), _C_LABEL(Xresume9) .long _C_LABEL(Xresume10), _C_LABEL(Xresume11) .long _C_LABEL(Xresume12), _C_LABEL(Xresume13) .long _C_LABEL(Xresume14), _C_LABEL(Xresume15) /* for soft interrupts */ .long 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 .long _C_LABEL(Xsofttty), _C_LABEL(Xsoftnet) .long _C_LABEL(Xsoftclock) /* fake interrupts to resume from splx() */ IDTVEC(recurse) .long _C_LABEL(Xrecurse0), _C_LABEL(Xrecurse1) .long _C_LABEL(Xrecurse2), _C_LABEL(Xrecurse3) .long _C_LABEL(Xrecurse4), _C_LABEL(Xrecurse5) .long _C_LABEL(Xrecurse6), _C_LABEL(Xrecurse7) .long _C_LABEL(Xrecurse8), _C_LABEL(Xrecurse9) .long _C_LABEL(Xrecurse10), _C_LABEL(Xrecurse11) .long _C_LABEL(Xrecurse12), _C_LABEL(Xrecurse13) .long _C_LABEL(Xrecurse14), _C_LABEL(Xrecurse15) /* for soft interrupts */ .long 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 .long _C_LABEL(Xsofttty), _C_LABEL(Xsoftnet) .long _C_LABEL(Xsoftclock) /* Some bogus data, to keep vmstat happy, for now. */ .globl _C_LABEL(intrnames), _C_LABEL(eintrnames) .globl _C_LABEL(intrcnt), _C_LABEL(eintrcnt) _C_LABEL(intrnames): .long 0 _C_LABEL(eintrnames): _C_LABEL(intrcnt): .long 0 _C_LABEL(eintrcnt):