diff options
Diffstat (limited to 'sys/amd64/isa/icu_ipl.s')
| -rw-r--r-- | sys/amd64/isa/icu_ipl.s | 57 |
1 files changed, 0 insertions, 57 deletions
diff --git a/sys/amd64/isa/icu_ipl.s b/sys/amd64/isa/icu_ipl.s index 3475358..d178d5c 100644 --- a/sys/amd64/isa/icu_ipl.s +++ b/sys/amd64/isa/icu_ipl.s @@ -55,63 +55,6 @@ _imen: .long HWI_MASK SUPERALIGN_TEXT /* - * Interrupt priority mechanism - * -- soft splXX masks with group mechanism (cpl) - * -- h/w masks for currently active or unused interrupts (imen) - * -- ipending = active interrupts currently masked by cpl - */ - -ENTRY(splz) - /* - * The caller has restored cpl and checked that (ipending & ~cpl) - * is nonzero. We have to repeat the check since if there is an - * interrupt while we're looking, _doreti processing for the - * interrupt will handle all the unmasked pending interrupts - * because we restored early. We're repeating the calculation - * of (ipending & ~cpl) anyway so that the caller doesn't have - * to pass it, so this only costs one "jne". "bsfl %ecx,%ecx" - * is undefined when %ecx is 0 so we can't rely on the secondary - * btrl tests. - */ - movl _cpl,%eax -splz_next: - /* - * We don't need any locking here. (ipending & ~cpl) cannot grow - * while we're looking at it - any interrupt will shrink it to 0. - */ - movl %eax,%ecx - notl %ecx - andl _ipending,%ecx - jne splz_unpend - ret - - ALIGN_TEXT -splz_unpend: - bsfl %ecx,%ecx - btrl %ecx,_ipending - jnc splz_next - cmpl $NHWI,%ecx - jae splz_swi - /* - * We would prefer to call the intr handler directly here but that - * doesn't work for badly behaved handlers that want the interrupt - * frame. Also, there's a problem determining the unit number. - * We should change the interface so that the unit number is not - * determined at config time. - */ - jmp *vec(,%ecx,4) - - ALIGN_TEXT -splz_swi: - pushl %eax - orl imasks(,%ecx,4),%eax - movl %eax,_cpl - call *_ihandlers(,%ecx,4) - popl %eax - movl %eax,_cpl - jmp splz_next - -/* * Fake clock interrupt(s) so that they appear to come from our caller instead * of from here, so that system profiling works. * XXX do this more generally (for all vectors; look up the C entry point). |
