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
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_align.h
_bus.h
_inttypes.h
_limits.h
_stdint.h	Introduce internal macros for __U/INT64_C to define the U/INT64_MAX/MIN	2012-01-04 16:02:52 +00:00
_types.h	Fix the value of float_t to match what is implied by FLT_EVAL_METHOD.	2012-01-16 20:17:51 +00:00
altivec.h
asm.h	Restore proper dot symbol creation for assembly files in the kernel build case.	2012-03-04 11:55:28 +00:00
atomic.h	Add a missing " to get closer to compiling.	2012-05-24 23:46:17 +00:00
bat.h
bus.h
bus_dma.h
clock.h
cpu.h	Add a convenience macro for the returns_twice attribute, and apply it to	2012-04-29 11:04:31 +00:00
cpufunc.h	Correctly specify assembler constrains for synchronization instructions.	2012-04-22 21:55:19 +00:00
db_machdep.h
dbdma.h
elf.h	Reserve AT_TIMEKEEP auxv entry for providing usermode the pointer to	2012-06-22 06:38:31 +00:00
endian.h	Add casts to __uint16_t to the __bswap16() macros on all arches which	2012-03-09 20:34:31 +00:00
exec.h
fdt.h
float.h	Add C11 macros describing subnormal numbers to float.h.	2012-01-23 06:36:41 +00:00
floatingpoint.h
fpu.h
frame.h
gdb_machdep.h
hid.h	Update HID defines for E500mc and E5500 CPU cores.	2012-05-25 21:12:24 +00:00
ieee.h
ieeefp.h	People porting FreeBSD to new architectures ought not have to	2011-10-21 06:41:46 +00:00
in_cksum.h	MFp4 bz_ipv6_fast:	2012-05-24 22:00:48 +00:00
intr_machdep.h
kdb.h
limits.h
machdep.h	Extract vendor specific Book-E pieces into separate files and have a common	2012-05-30 17:34:40 +00:00
md_var.h
memdev.h
metadata.h
mmuvar.h
ofw_machdep.h
openpicreg.h
openpicvar.h
param.h
pcb.h
pcpu.h	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00
pio.h	Fix final bugs in memory barriers on PowerPC:	2012-05-04 16:00:22 +00:00
platform.h
platformvar.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
proc.h
profile.h	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00
psl.h	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00
pte.h	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00
ptrace.h
reg.h
reloc.h
resource.h
rtas.h
runq.h
sc_machdep.h
setjmp.h
sf_buf.h
sigframe.h
signal.h
slb.h
smp.h
spr.h	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00
sr.h
stack.h
stdarg.h
sysarch.h
tlb.h	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00
trap.h	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00
trap_aim.h	Allow multiple inclusion of trap.h. This has always been broken, but	2012-03-29 02:02:14 +00:00
trap_booke.h	Allow multiple inclusion of trap.h. This has always been broken, but	2012-03-29 02:02:14 +00:00
ucontext.h	Organize some members of ucontext_t in the same order they are in the	2012-04-21 14:39:47 +00:00
varargs.h
vdso.h	Implement mechanism to export some kernel timekeeping data to	2012-06-22 07:06:40 +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	Let us manage differences of Book-E PowerPC variations i.e. vendor /	2012-05-27 10:25:20 +00:00