diff options
Diffstat (limited to 'sys/amd64/isa/vector.S')
-rw-r--r-- | sys/amd64/isa/vector.S | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/sys/amd64/isa/vector.S b/sys/amd64/isa/vector.S deleted file mode 100644 index 2d7be50..0000000 --- a/sys/amd64/isa/vector.S +++ /dev/null @@ -1,76 +0,0 @@ -/* - * 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" |