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-rw-r--r--sys/amd64/isa/vector.S76
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diff --git a/sys/amd64/isa/vector.S b/sys/amd64/isa/vector.S
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-/*
- * from: vector.s, 386BSD 0.1 unknown origin
- * $FreeBSD$
- */
-
-#include <amd64/isa/icu.h>
-#include <amd64/isa/isa.h>
-#include <amd64/isa/intr_machdep.h>
-
- .data
- ALIGN_DATA
-
-/*
- * Interrupt counters and names for export to vmstat(8) and friends.
- *
- * XXX this doesn't really belong here; everything except the labels
- * for the endpointers is almost machine-independent.
- */
-
- .globl intrcnt, eintrcnt
-intrcnt:
- .space INTRCNT_COUNT * 8
-eintrcnt:
-
- .globl intrnames, eintrnames
-intrnames:
- .space INTRCNT_COUNT * 32
-eintrnames:
- .text
-
-/*
- * Macros for interrupt interrupt entry, call to handler, and exit.
- *
- * XXX - the interrupt frame is set up to look like a trap frame. This is
- * usually a waste of time. The only interrupt handlers that want a frame
- * are the clock handler (it wants a clock frame), the fpu handler (it's
- * easier to do right all in assembler). The interrupt return routine
- * needs a trap frame for rare AST's (it could easily convert the frame).
- * 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 call-saved regs %esi, %edi and %ebp twice, The indirect
- * costs are making the driver interface nonuniform so unpending of
- * interrupts is more complicated and slower (call_driver(unit) would
- * be easier than ensuring an interrupt frame for all handlers. Finally,
- * there are some struct copies in the fpu handler and maybe in the clock
- * handler that could be avoided by working more with pointers to frames
- * instead of frames.
- *
- * XXX - should we do a cld on every system entry to avoid the requirement
- * for scattered cld's?
- *
- * Coding notes for *.s:
- *
- * If possible, avoid operations that involve an operand size override.
- * Word-sized operations might be smaller, but the operand size override
- * makes them slower on on 486's and no faster on 386's unless perhaps
- * the instruction pipeline is depleted. E.g.,
- *
- * Use movl to seg regs instead of the equivalent but more descriptive
- * movw - gas generates an irelevant (slower) operand size override.
- *
- * Use movl to ordinary regs in preference to movw and especially
- * in preference to movz[bw]l. Use unsigned (long) variables with the
- * top bits clear instead of unsigned short variables to provide more
- * opportunities for movl.
- *
- * If possible, use byte-sized operations. They are smaller and no slower.
- *
- * Use (%reg) instead of 0(%reg) - gas generates larger code for the latter.
- *
- * 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 segregs.
- */
-
-#include "amd64/isa/icu_vector.S"
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