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aea810386d
freebsd-nq/sys/i386/include
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Konstantin Belousov aea810386d Implement mechanism to export some kernel timekeeping data to 
usermode, using shared page.  The structures and functions have vdso
prefix, to indicate the intended location of the code in some future.

The versioned per-algorithm data is exported in the format of struct
vdso_timehands, which mostly repeats the content of in-kernel struct
timehands. Usermode reading of the structure can be lockless.
Compatibility export for 32bit processes on 64bit host is also
provided. Kernel also provides usermode with indication about
currently used timecounter, so that libc can fall back to syscall if
configured timecounter is unknown to usermode code.

The shared data updates are initiated both from the tc_windup(), where
a fast task is queued to do the update, and from sysctl handlers which
change timecounter. A manual override switch
kern.timecounter.fast_gettime allows to turn off the mechanism.

Only x86 architectures export the real algorithm data, and there, only
for tsc timecounter. HPET counters page could be exported as well, but
I prefer to not further glue the kernel and libc ABI there until
proper vdso-based solution is developed.

Minimal stubs neccessary for non-x86 architectures to still compile
are provided.

Discussed with:	bde
Reviewed by:	jhb
Tested by:	flo
MFC after:	1 month
2012-06-22 07:06:40 +00:00
..
pc
xen Fix the netback driver build for i386. 2012-02-02 17:54:35 +00:00
_align.h Merge amd64/i386 _align.h by aligning on the size of register_t (copied 2010-11-26 10:59:20 +00:00
_bus.h
_inttypes.h Copy powerpc/include/_inttypes.h to x86 and replace i386/amd64/pc98 2011-01-08 18:09:48 +00:00
_limits.h Copy amd64 _limits.h to x86 and merge with i386 _limits.h. Replace 2012-02-28 18:24:28 +00:00
_stdint.h Copy amd64 _stdint.h to x86 and merge with i386 _stdint.h. Replace 2012-02-28 18:38:33 +00:00
_types.h Copy amd64 _types.h to x86 and merge with i386 _types.h. Replace existing 2012-02-28 18:15:28 +00:00
acpica_machdep.h
apicvar.h Add SMP/i386 suspend/resume support. 2012-05-18 18:55:58 +00:00
apm_bios.h Move identical copies of apm_bios.h to sys/x86/include, replace them with 2010-11-11 19:36:21 +00:00
apm_segments.h
asm.h Also import WEAK_ALIAS() from the MIPS code. 2012-01-05 08:51:06 +00:00
asmacros.h
atomic.h Use plain store for atomic_store_rel on x86, instead of implicitly 2012-06-02 18:10:16 +00:00
bootinfo.h i386 bootinfo: re-arrange EFI fields for natural alignment and packing 2012-05-13 09:25:39 +00:00
bus_dma.h
bus.h Merge amd64 and i386 bus.h and move the resulting header to x86. Replace 2010-12-20 16:39:43 +00:00
clock.h Implement boot-time TSC synchronization test for SMP. This test is executed 2011-05-09 17:34:00 +00:00
cpu.h Use cpu_ticks() for get_cyclecount(9) rather than checking existence of TSC 2011-04-04 22:56:33 +00:00
cpufunc.h Correct cpu_monitor() and cpu_mwait() for amd64. These instructions take 2011-07-05 18:42:10 +00:00
cputypes.h
cserial.h
db_machdep.h
elan_mmcr.h
elf.h Reserve AT_TIMEKEEP auxv entry for providing usermode the pointer to 2012-06-22 06:38:31 +00:00
endian.h Copy amd64 endian.h to x86 and merge with i386 endian.h. Replace 2012-02-28 19:39:54 +00:00
exec.h
float.h Copy amd64 float.h to x86 and merge with i386 float.h. Replace 2012-03-04 14:00:32 +00:00
floatingpoint.h
frame.h
gdb_machdep.h
ieeefp.h People porting FreeBSD to new architectures ought not have to 2011-10-21 06:41:46 +00:00
if_wl_wavelan.h
in_cksum.h MFp4 bz_ipv6_fast: 2012-05-24 22:00:48 +00:00
intr_machdep.h Revert part of r234723 by re-enabling the SMP protection for 2012-05-03 21:44:01 +00:00
ioctl_bt848.h
ioctl_meteor.h
iodev.h - Extract the IODEV_PIO interface from ia64 and make it MI. 2010-04-28 15:38:01 +00:00
kdb.h
limits.h
md_var.h Add SMP/i386 suspend/resume support. 2012-05-18 18:55:58 +00:00
memdev.h Add reader/writer lock around mem_range_attr_get() and mem_range_attr_set(). 2011-01-17 22:58:28 +00:00
metadata.h
minidump.h
mp_watchdog.h
nexusvar.h
npx.h Move userland bits of i386 npx.h and amd64 fpu.h to x86 fpu.h. 2012-03-16 20:24:30 +00:00
param.h Add the possibility to specify from kernel configs MAXCPU value. 2011-07-19 00:37:24 +00:00
pcaudioio.h Convert files to UTF-8 2012-01-15 13:23:18 +00:00
pcb_ext.h
pcb.h - Fix resumectx() prototypes to reflect reality. 2012-06-13 21:03:01 +00:00
pci_cfgreg.h Move {amd64,i386}/pci/pci_bus.c and {amd64,i386}/include/pci_cfgreg.h to 2011-06-22 21:04:13 +00:00
pcpu.h Make "options XENHVM" compile for i386, not just amd64 -- a largely 2011-01-04 14:49:54 +00:00
perfmon.h
pmap.h The page flag PGA_WRITEABLE is set and cleared exclusively by the pmap 2012-06-16 18:56:19 +00:00
pmc_mdep.h Add software PMC support. 2012-03-28 20:58:30 +00:00
ppireg.h
privatespace.h
proc.h Handle spurious page faults that may occur in no-fault sections of the 2012-03-22 04:52:51 +00:00
profile.h Use intr_disable() and intr_restore() instead of frobbing the flags register 2010-10-25 15:28:03 +00:00
psl.h Copy i386 psl.h to x86 and replace amd64/i386/pc98 psl.h with stubs. 2012-03-19 21:29:57 +00:00
ptrace.h Copy amd64 ptrace.h to x86 and merge with i386 ptrace.h. Replace 2012-03-04 20:24:28 +00:00
reg.h Copy i386 reg.h to x86 and merge with amd64 reg.h. Replace i386/amd64/pc98 2012-03-18 19:06:38 +00:00
reloc.h
resource.h
runq.h
segments.h Move userland bits (and some common kernel bits) from amd64 and i386 2012-03-19 21:24:50 +00:00
setjmp.h Copy amd64 setjmp.h to x86 and replace amd64/i386/pc98 setjmp.h with stubs. 2012-02-28 22:17:52 +00:00
sf_buf.h Commit the support for removing cpumask_t and replacing it directly with 2011-05-05 14:39:14 +00:00
sigframe.h
signal.h Synchronize the struct sigcontext definitions on x86 with mcontext_t. 2012-01-30 07:51:52 +00:00
smapi.h
smp.h Share IPI init and startup code of mp_machdep.c with acpi_wakeup.c 2012-06-12 00:14:54 +00:00
speaker.h
specialreg.h Copy i386 specialreg.h to x86 and merge with amd64 specialreg.h. Replace 2012-03-19 21:34:11 +00:00
stack.h
stdarg.h Copy amd64 stdarg.h to x86 and replace amd64/i386/pc98 stdarg.h with stubs. 2012-02-28 22:30:58 +00:00
sysarch.h Copy amd64 sysarch.h to x86 and merge with i386 sysarch.h. Replace 2012-03-19 21:57:31 +00:00
timerreg.h
trap.h Copy amd64 trap.h to x86 and replace amd64/i386/pc98 trap.h with stubs. 2012-03-04 14:12:57 +00:00
tss.h
ucontext.h Add support for the extended FPU states on amd64, both for native 2012-01-21 17:45:27 +00:00
varargs.h
vdso.h Implement mechanism to export some kernel timekeeping data to 2012-06-22 07:06:40 +00:00
vm86.h Increase maximum number of page table entries per VM86 context from 8 to 24 2010-08-25 21:13:23 +00:00
vm.h - Rename VM_MEMATTR_UNCACHED to VM_MEMATTR_WEAK_UNCACHEABLE on x86 to 2012-03-29 16:51:22 +00:00
vmparam.h Avoid the possibility of integer overflow in the calculation of 2011-12-10 18:42:00 +00:00
xbox.h