94ca32a3f5
handlers if interrupts are nested more than a few (3) deep. This only reduces the maximum nesting level by 1 with the standard drivers unless there is a related bug somewhere, but can't hurt much (the worst case is returning to hoggish interrupt handler like wdintr(), but such interrupt handlers hurt anyway). Fixed a previously harmless race incrementing the interrupt nesting level. This should be in 2.1.6 and 2.2.
315 lines
9.9 KiB
ArmAsm
315 lines
9.9 KiB
ArmAsm
/*
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* from: vector.s, 386BSD 0.1 unknown origin
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* $Id: vector.s,v 1.22 1996/11/06 17:02:38 bde Exp $
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*/
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/*
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* modified for PC98 by Kakefuda
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*/
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#include "opt_auto_eoi.h"
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#include <i386/isa/icu.h>
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#ifdef PC98
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#include <pc98/pc98/pc98.h>
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#else
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#include <i386/isa/isa.h>
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#endif
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#ifdef PC98
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#define ICU_IMR_OFFSET 2 /* IO_ICU{1,2} + 2 */
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#else
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#define ICU_IMR_OFFSET 1 /* IO_ICU{1,2} + 1 */
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#endif
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#define ICU_EOI 0x20 /* XXX - define elsewhere */
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#define IRQ_BIT(irq_num) (1 << ((irq_num) % 8))
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#define IRQ_BYTE(irq_num) ((irq_num) / 8)
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#ifdef AUTO_EOI_1
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#define ENABLE_ICU1 /* use auto-EOI to reduce i/o */
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#define OUTB_ICU1
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#else
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#define ENABLE_ICU1 \
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movb $ICU_EOI,%al ; /* as soon as possible send EOI ... */ \
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OUTB_ICU1 /* ... to clear in service bit */
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#define OUTB_ICU1 \
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outb %al,$IO_ICU1
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#endif
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#ifdef AUTO_EOI_2
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/*
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* The data sheet says no auto-EOI on slave, but it sometimes works.
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*/
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#define ENABLE_ICU1_AND_2 ENABLE_ICU1
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#else
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#define ENABLE_ICU1_AND_2 \
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movb $ICU_EOI,%al ; /* as above */ \
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outb %al,$IO_ICU2 ; /* but do second icu first ... */ \
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OUTB_ICU1 /* ... then first icu (if !AUTO_EOI_1) */
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#endif
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#ifdef FAST_INTR_HANDLER_USES_ES
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#define ACTUALLY_PUSHED 1
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#define MAYBE_MOVW_AX_ES movl %ax,%es
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#define MAYBE_POPL_ES popl %es
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#define MAYBE_PUSHL_ES pushl %es
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#else
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/*
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* We can usually skip loading %es for fastintr handlers. %es should
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* only be used for string instructions, and fastintr handlers shouldn't
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* do anything slow enough to justify using a string instruction.
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*/
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#define ACTUALLY_PUSHED 0
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#define MAYBE_MOVW_AX_ES
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#define MAYBE_POPL_ES
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#define MAYBE_PUSHL_ES
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#endif
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/*
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* Macros for interrupt interrupt entry, call to handler, and exit.
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*
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* XXX - the interrupt frame is set up to look like a trap frame. This is
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* usually a waste of time. The only interrupt handlers that want a frame
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* are the clock handler (it wants a clock frame), the npx handler (it's
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* easier to do right all in assembler). The interrupt return routine
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* needs a trap frame for rare AST's (it could easily convert the frame).
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* The direct costs of setting up a trap frame are two pushl's (error
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* code and trap number), an addl to get rid of these, and pushing and
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* popping the call-saved regs %esi, %edi and %ebp twice, The indirect
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* costs are making the driver interface nonuniform so unpending of
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* interrupts is more complicated and slower (call_driver(unit) would
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* be easier than ensuring an interrupt frame for all handlers. Finally,
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* there are some struct copies in the npx handler and maybe in the clock
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* handler that could be avoided by working more with pointers to frames
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* instead of frames.
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*
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* XXX - should we do a cld on every system entry to avoid the requirement
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* for scattered cld's?
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*
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* Coding notes for *.s:
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*
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* If possible, avoid operations that involve an operand size override.
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* Word-sized operations might be smaller, but the operand size override
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* makes them slower on on 486's and no faster on 386's unless perhaps
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* the instruction pipeline is depleted. E.g.,
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*
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* Use movl to seg regs instead of the equivalent but more descriptive
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* movw - gas generates an irelevant (slower) operand size override.
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*
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* Use movl to ordinary regs in preference to movw and especially
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* in preference to movz[bw]l. Use unsigned (long) variables with the
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* top bits clear instead of unsigned short variables to provide more
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* opportunities for movl.
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*
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* If possible, use byte-sized operations. They are smaller and no slower.
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*
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* Use (%reg) instead of 0(%reg) - gas generates larger code for the latter.
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*
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* If the interrupt frame is made more flexible, INTR can push %eax first
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* and decide the ipending case with less overhead, e.g., by avoiding
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* loading segregs.
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*/
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#define FAST_INTR(irq_num, vec_name, enable_icus) \
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.text ; \
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SUPERALIGN_TEXT ; \
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IDTVEC(vec_name) ; \
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pushl %eax ; /* save only call-used registers */ \
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pushl %ecx ; \
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pushl %edx ; \
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pushl %ds ; \
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MAYBE_PUSHL_ES ; \
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movl $KDSEL,%eax ; \
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movl %ax,%ds ; \
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MAYBE_MOVW_AX_ES ; \
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FAKE_MCOUNT((4+ACTUALLY_PUSHED)*4(%esp)) ; \
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pushl _intr_unit + (irq_num) * 4 ; \
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call *_intr_handler + (irq_num) * 4 ; /* do the work ASAP */ \
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enable_icus ; /* (re)enable ASAP (helps edge trigger?) */ \
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addl $4,%esp ; \
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incl _cnt+V_INTR ; /* book-keeping can wait */ \
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movl _intr_countp + (irq_num) * 4,%eax ; \
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incl (%eax) ; \
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movl _cpl,%eax ; /* are we unmasking pending HWIs or SWIs? */ \
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notl %eax ; \
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andl _ipending,%eax ; \
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jne 2f ; /* yes, maybe handle them */ \
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1: ; \
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MEXITCOUNT ; \
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MAYBE_POPL_ES ; \
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popl %ds ; \
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popl %edx ; \
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popl %ecx ; \
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popl %eax ; \
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iret ; \
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; \
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ALIGN_TEXT ; \
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2: ; \
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cmpb $3,_intr_nesting_level ; /* is there enough stack? */ \
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jae 1b ; /* no, return */ \
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movl _cpl,%eax ; \
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/* XXX next line is probably unnecessary now. */ \
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movl $HWI_MASK|SWI_MASK,_cpl ; /* limit nesting ... */ \
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incb _intr_nesting_level ; /* ... really limit it ... */ \
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sti ; /* ... to do this as early as possible */ \
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MAYBE_POPL_ES ; /* discard most of thin frame ... */ \
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popl %ecx ; /* ... original %ds ... */ \
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popl %edx ; \
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xchgl %eax,4(%esp) ; /* orig %eax; save cpl */ \
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pushal ; /* build fat frame (grrr) ... */ \
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pushl %ecx ; /* ... actually %ds ... */ \
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pushl %es ; \
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movl $KDSEL,%eax ; \
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movl %ax,%es ; \
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movl (2+8+0)*4(%esp),%ecx ; /* ... %ecx from thin frame ... */ \
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movl %ecx,(2+6)*4(%esp) ; /* ... to fat frame ... */ \
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movl (2+8+1)*4(%esp),%eax ; /* ... cpl from thin frame */ \
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pushl %eax ; \
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subl $4,%esp ; /* junk for unit number */ \
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MEXITCOUNT ; \
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jmp _doreti
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#define INTR(irq_num, vec_name, icu, enable_icus, reg) \
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.text ; \
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SUPERALIGN_TEXT ; \
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IDTVEC(vec_name) ; \
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pushl $0 ; /* dummy error code */ \
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pushl $0 ; /* dummy trap type */ \
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pushal ; \
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pushl %ds ; /* save our data and extra segments ... */ \
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pushl %es ; \
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movl $KDSEL,%eax ; /* ... and reload with kernel's own ... */ \
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movl %ax,%ds ; /* ... early for obsolete reasons */ \
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movl %ax,%es ; \
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movb _imen + IRQ_BYTE(irq_num),%al ; \
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orb $IRQ_BIT(irq_num),%al ; \
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movb %al,_imen + IRQ_BYTE(irq_num) ; \
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outb %al,$icu+ICU_IMR_OFFSET ; \
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enable_icus ; \
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movl _cpl,%eax ; \
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testb $IRQ_BIT(irq_num),%reg ; \
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jne 2f ; \
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incb _intr_nesting_level ; \
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__CONCAT(Xresume,irq_num): ; \
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FAKE_MCOUNT(12*4(%esp)) ; /* XXX late to avoid double count */ \
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incl _cnt+V_INTR ; /* tally interrupts */ \
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movl _intr_countp + (irq_num) * 4,%eax ; \
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incl (%eax) ; \
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movl _cpl,%eax ; \
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pushl %eax ; \
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pushl _intr_unit + (irq_num) * 4 ; \
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orl _intr_mask + (irq_num) * 4,%eax ; \
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movl %eax,_cpl ; \
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sti ; \
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call *_intr_handler + (irq_num) * 4 ; \
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cli ; /* must unmask _imen and icu atomically */ \
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movb _imen + IRQ_BYTE(irq_num),%al ; \
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andb $~IRQ_BIT(irq_num),%al ; \
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movb %al,_imen + IRQ_BYTE(irq_num) ; \
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outb %al,$icu+ICU_IMR_OFFSET ; \
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sti ; /* XXX _doreti repeats the cli/sti */ \
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MEXITCOUNT ; \
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/* We could usually avoid the following jmp by inlining some of */ \
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/* _doreti, but it's probably better to use less cache. */ \
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jmp _doreti ; \
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; \
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ALIGN_TEXT ; \
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2: ; \
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/* XXX skip mcounting here to avoid double count */ \
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orb $IRQ_BIT(irq_num),_ipending + IRQ_BYTE(irq_num) ; \
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popl %es ; \
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popl %ds ; \
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popal ; \
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addl $4+4,%esp ; \
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iret
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MCOUNT_LABEL(bintr)
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FAST_INTR(0,fastintr0, ENABLE_ICU1)
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FAST_INTR(1,fastintr1, ENABLE_ICU1)
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FAST_INTR(2,fastintr2, ENABLE_ICU1)
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FAST_INTR(3,fastintr3, ENABLE_ICU1)
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FAST_INTR(4,fastintr4, ENABLE_ICU1)
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FAST_INTR(5,fastintr5, ENABLE_ICU1)
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FAST_INTR(6,fastintr6, ENABLE_ICU1)
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FAST_INTR(7,fastintr7, ENABLE_ICU1)
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FAST_INTR(8,fastintr8, ENABLE_ICU1_AND_2)
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FAST_INTR(9,fastintr9, ENABLE_ICU1_AND_2)
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FAST_INTR(10,fastintr10, ENABLE_ICU1_AND_2)
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FAST_INTR(11,fastintr11, ENABLE_ICU1_AND_2)
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FAST_INTR(12,fastintr12, ENABLE_ICU1_AND_2)
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FAST_INTR(13,fastintr13, ENABLE_ICU1_AND_2)
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FAST_INTR(14,fastintr14, ENABLE_ICU1_AND_2)
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FAST_INTR(15,fastintr15, ENABLE_ICU1_AND_2)
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INTR(0,intr0, IO_ICU1, ENABLE_ICU1, al)
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INTR(1,intr1, IO_ICU1, ENABLE_ICU1, al)
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INTR(2,intr2, IO_ICU1, ENABLE_ICU1, al)
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INTR(3,intr3, IO_ICU1, ENABLE_ICU1, al)
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INTR(4,intr4, IO_ICU1, ENABLE_ICU1, al)
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INTR(5,intr5, IO_ICU1, ENABLE_ICU1, al)
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INTR(6,intr6, IO_ICU1, ENABLE_ICU1, al)
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INTR(7,intr7, IO_ICU1, ENABLE_ICU1, al)
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INTR(8,intr8, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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INTR(9,intr9, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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INTR(10,intr10, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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INTR(11,intr11, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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INTR(12,intr12, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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INTR(13,intr13, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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INTR(14,intr14, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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INTR(15,intr15, IO_ICU2, ENABLE_ICU1_AND_2, ah)
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MCOUNT_LABEL(eintr)
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.data
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ihandlers: /* addresses of interrupt handlers */
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/* actually resumption addresses for HWI's */
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.long Xresume0, Xresume1, Xresume2, Xresume3
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.long Xresume4, Xresume5, Xresume6, Xresume7
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.long Xresume8, Xresume9, Xresume10, Xresume11
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.long Xresume12, Xresume13, Xresume14, Xresume15
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.long swi_tty, swi_net, 0, 0, 0, 0, 0, 0
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.long 0, 0, 0, 0, 0, 0, _softclock, swi_ast
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imasks: /* masks for interrupt handlers */
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.space NHWI*4 /* padding; HWI masks are elsewhere */
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.long SWI_TTY_MASK, SWI_NET_MASK, 0, 0, 0, 0, 0, 0
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.long 0, 0, 0, 0, 0, 0, SWI_CLOCK_MASK, SWI_AST_MASK
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.globl _intr_nesting_level
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_intr_nesting_level:
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.byte 0
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.space 3
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/*
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* Interrupt counters and names. The format of these and the label names
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* must agree with what vmstat expects. The tables are indexed by device
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* ids so that we don't have to move the names around as devices are
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* attached.
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*/
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#include "vector.h"
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.globl _intrcnt, _eintrcnt
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_intrcnt:
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.space (NR_DEVICES + ICU_LEN) * 4
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_eintrcnt:
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.globl _intrnames, _eintrnames
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_intrnames:
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.ascii DEVICE_NAMES
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.asciz "stray irq0"
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.asciz "stray irq1"
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.asciz "stray irq2"
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.asciz "stray irq3"
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.asciz "stray irq4"
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.asciz "stray irq5"
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.asciz "stray irq6"
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.asciz "stray irq7"
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.asciz "stray irq8"
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.asciz "stray irq9"
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.asciz "stray irq10"
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.asciz "stray irq11"
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.asciz "stray irq12"
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.asciz "stray irq13"
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.asciz "stray irq14"
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.asciz "stray irq15"
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_eintrnames:
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.text
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