John Baldwin fb610ca1f9 Minor fixes and tweaks to the x86 interrupt code: ... - Split the intr_table_lock into an sx lock used for most things, and a spin lock to protect intrcnt_index. Originally I had this as a spin lock so interrupt code could use it to lookup sources. However, we don't actually do that because it would add a lot of overhead to interrupts, and if we ever do support removing interrupt sources, we can use other means to safely do so w/o locking in the interrupt handling code. - Replace is_enabled (boolean) with is_handlers (a count of handlers) to determine if a source is enabled or not. This allows us to notice when a source is no longer in use. When that happens, we now invoke a new PIC method (pic_disable_intr()) to inform the PIC driver that the source is no longer in use. The I/O APIC driver frees the APIC IDT vector when this happens. The MSI driver no longer needs to have a hack to clear is_enabled during msi_alloc() and msix_alloc() as a result of this change as well. - Add an apic_disable_vector() to reset an IDT vector back to Xrsvd to complement apic_enable_vector() and use it in the I/O APIC and MSI code when freeing an IDT vector. - Add a new nexus hook: nexus_add_irq() to ask the nexus driver to add an IRQ to its irq_rman. The MSI code uses this when it creates new interrupt sources to let the nexus know about newly valid IRQs. Previously the msi_alloc() and msix_alloc() passed some extra stuff back to the nexus methods which then added the IRQs. This approach is a bit cleaner. - Change the MSI sx lock to a mutex. If we need to create new sources, drop the lock, create the required number of sources, then get the lock and try the allocation again.		2007-05-08 21:29:14 +00:00
..
atpic_vector.s	Evidently FreeBSD has long relied on the compiler to treat structures	2006-12-17 05:07:01 +00:00
atpic.c	Minor fixes and tweaks to the x86 interrupt code:	2007-05-08 21:29:14 +00:00
ccbque.h
clock.c	Partial fix for a bug in rev.1.231. If suspend/resume clobbers the	2007-03-05 09:10:17 +00:00
elcr.c
elink.c
elink.h
icu.h	Evidently FreeBSD has long relied on the compiler to treat structures	2006-12-17 05:07:01 +00:00
isa_dma.c
isa.c	o break newbus api: add a new argument of type driver_filter_t to	2007-02-23 12:19:07 +00:00
isa.h
nmi.c
npx.c	o break newbus api: add a new argument of type driver_filter_t to	2007-02-23 12:19:07 +00:00
pmtimer.c	First part of a little cleanup in the calendar/timezone/RTC handling.	2006-10-02 12:59:59 +00:00
prof_machdep.c	Add an interface for drivers to be notified of changes to CPU frequency.	2007-03-26 18:03:29 +00:00
spic.c	Since DELAY() was moved, most <machine/clock.h> #includes have been	2006-05-16 14:37:58 +00:00
spicreg.h
vesa.c	Fix -Wundef warnings found when compiling i386 LINT, GENERIC and	2005-12-05 11:58:35 +00:00