Konstantin Belousov 2d4c4c8dc7 Implements EOI suppression mode, where LAPIC on EOI command for ... level-triggered interrupt does not broadcast the EOI message to all APICs in the system. Instead, interrupt handler must follow LAPIC EOI with IOAPIC EOI. For modern IOAPICs, the later is done by writing to EOIR register. Otherwise, Intel provided Linux with a trick of temporary switching the pin config to edge and then back to level. Detect presence of EOIR register by reading IO-APIC version. The summary table in the comments was taken from the Linux kernel. For Intel, newer IO-APICs are only briefly documented as part of the ICH/PCH datasheet. According to the BKDG and chipset documentation, AMD LAPICs do not provide EOI suppression, althought IO-APICs do declare version 0x21 and implement EOIR. The trick to temporary switch pin to edge mode to clear IRR was tested on modern chipset, by pretending that EOIR is not present, i.e. by forcing io_haseoi to zero. Tunable hw.lapic_eoi_suppression disables the optimization. Reviewed by: neel Tested by: pho Review: https://reviews.freebsd.org/D1943 Sponsored by: The FreeBSD Foundation MFC after: 2 months		2015-02-26 11:02:40 +00:00
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_align.h
_inttypes.h
_limits.h
_stdint.h
_types.h	Rename __wchar_t so it no longer conflicts with __wchar_t from clang 3.4	2014-04-01 14:46:11 +00:00
acpica_machdep.h	x86/madt: make the interrupt override parser a public function	2014-08-04 08:58:50 +00:00
apicreg.h	Add x2APIC support. Enable it by default if CPU is capable. The	2015-02-09 21:00:56 +00:00
apicvar.h	Implements EOI suppression mode, where LAPIC on EOI command for	2015-02-26 11:02:40 +00:00
apm_bios.h
bus.h	Update NetBSD Foundation copyrights to 2-clause BSD	2014-03-18 01:40:25 +00:00
busdma_impl.h	Remove redundand declaration, fixing the build with gcc.	2013-10-29 07:25:54 +00:00
dump.h	Factor out duplicated code from dumpsys() on each architecture into generic	2015-01-07 01:01:39 +00:00
elf.h
endian.h
fdt.h	Retire machine/fdt.h as a header used by MI code, as its function is now	2014-01-05 18:46:58 +00:00
float.h
fpu.h	Improve support for XSAVE with debuggers.	2014-11-21 20:53:17 +00:00
frame.h
init.h	msi: add Xen MSI implementation	2014-09-30 16:46:45 +00:00
legacyvar.h	Add support for managing PCI bus numbers. As with BARs and PCI-PCI bridge	2014-02-12 04:30:37 +00:00
mca.h
mptable.h	Use fixed-width types for all fields in MP Table structures and pack	2013-12-11 21:19:04 +00:00
ofw_machdep.h	Retire machine/fdt.h as a header used by MI code, as its function is now	2014-01-05 18:46:58 +00:00
pci_cfgreg.h
psl.h	x86: Allow users to change PSL_RF via ptrace(PT_SETREGS...)	2013-11-14 15:37:20 +00:00
ptrace.h	Improve support for XSAVE with debuggers.	2014-11-21 20:53:17 +00:00
pvclock.h	Add interface to derive a TSC frequency from the pvclock	2015-02-04 08:33:04 +00:00
reg.h
segments.h	Remove ia64.	2014-07-07 00:27:09 +00:00
setjmp.h
sigframe.h
signal.h
specialreg.h	Add x2APIC support. Enable it by default if CPU is capable. The	2015-02-09 21:00:56 +00:00
stdarg.h	Add a va_copy() to our fall-back stdarg implementation for use with lint(1)	2013-10-07 10:01:23 +00:00
sysarch.h
trap.h	Remove references to an unused fasttrap probe hook, and remove the	2013-10-31 02:35:00 +00:00
ucontext.h
vdso.h
vmware.h	Detect whether x2APIC on VMWare is usable without interrupt	2015-02-14 09:00:12 +00:00