77 lines
2.7 KiB
ArmAsm
77 lines
2.7 KiB
ArmAsm
/*
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* from: vector.s, 386BSD 0.1 unknown origin
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* $FreeBSD$
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*/
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#include <amd64/isa/icu.h>
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#include <amd64/isa/isa.h>
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#include <amd64/isa/intr_machdep.h>
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.data
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ALIGN_DATA
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/*
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* Interrupt counters and names for export to vmstat(8) and friends.
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*
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* XXX this doesn't really belong here; everything except the labels
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* for the endpointers is almost machine-independent.
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*/
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.globl intrcnt, eintrcnt
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intrcnt:
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.space INTRCNT_COUNT * 8
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eintrcnt:
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.globl intrnames, eintrnames
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intrnames:
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.space INTRCNT_COUNT * 32
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eintrnames:
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.text
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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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#include "amd64/isa/icu_vector.S"
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