diff options
Diffstat (limited to 'sys/i386/isa/apic_ipl.s')
| -rw-r--r-- | sys/i386/isa/apic_ipl.s | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/sys/i386/isa/apic_ipl.s b/sys/i386/isa/apic_ipl.s index 94771f3eadb3..0def1de7e02d 100644 --- a/sys/i386/isa/apic_ipl.s +++ b/sys/i386/isa/apic_ipl.s @@ -69,78 +69,6 @@ _apic_imen: SUPERALIGN_TEXT /* - * splz() - dispatch pending interrupts after cpl reduced - * - * 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. However, since ipending can change at any time - * (by an interrupt or, with SMP, by another cpu), we have to - * repeat the check. At the moment we must own the MP lock in - * the SMP case because the interruput handlers require it. We - * loop until no unmasked pending interrupts remain. - * - * No new unmaksed pending interrupts will be added during the - * loop because, being unmasked, the interrupt code will be able - * to execute the interrupts. - * - * Interrupts come in two flavors: Hardware interrupts and software - * interrupts. We have to detect the type of interrupt (based on the - * position of the interrupt bit) and call the appropriate dispatch - * routine. - * - * NOTE: "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 /* set bit = unmasked level */ - andl _ipending,%ecx /* set bit = unmasked pending INT */ - jne splz_unpend - ret - - ALIGN_TEXT -splz_unpend: - bsfl %ecx,%ecx - lock - 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. - * - * The vec[] routines build the proper frame on the stack, - * then call one of _Xintr0 thru _XintrNN. - */ - 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). @@ -161,8 +89,6 @@ __CONCAT(vec,irq_num): ; \ pushl $KCSEL ; \ pushl %eax ; \ cli ; \ - lock ; /* MP-safe */ \ - andl $~IRQ_BIT(irq_num), iactive ; /* lazy masking */ \ MEXITCOUNT ; \ APIC_ITRACE(apic_itrace_splz, irq_num, APIC_ITRACE_SPLZ) ; \ jmp __CONCAT(_Xintr,irq_num) |