Konstantin Belousov 70a7dd5d5b Fix issues with zeroing and fetching the counters, on x86 and ppc64. ... Issues were noted by Bruce Evans and are present on all architectures. On i386, a counter fetch should use atomic read of 64bit value, otherwise carry from the increment on other CPU could be lost for the given fetch, making error of 2^32. If 64bit read (cmpxchg8b) is not available on the machine, it cannot be SMP and it is enough to disable preemption around read to avoid the split read. On x86 the counter increment is not atomic on purpose, which makes it possible for the store of the incremented result to override just zeroed per-cpu slot. The effect would be a counter going off by arbitrary value after zeroing. Perform the counter zeroing on the same processor which does the increments, making the operations mutually exclusive. On i386, same as for the fetching, if the cmpxchg8b is not available, machine is not SMP and we disable preemption for zeroing. PowerPC64 is treated the same as amd64. For other architectures, the changes made to allow the compilation to succeed, without fixing the issues with zeroing or fetching. It should be possible to handle them by using the 64bit loads and stores atomic WRT preemption (assuming the architectures also converted from using critical sections to proper asm). If architecture does not provide the facility, using global (spin) mutex would be non-optimal but working solution. Noted by: bde Sponsored by: The FreeBSD Foundation		2013-07-01 02:48:27 +00:00
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pc	- Re-shuffle the <machine/pc/bios.h> headers to move all kernel-specific	2012-09-28 11:59:32 +00:00
xen	Upgrade Xen interface headers to Xen 4.2.1.	2013-06-14 23:43:44 +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	Move definitions required by userland applications out of acpica_machdep.h.	2013-06-27 00:22:40 +00:00
apicvar.h	Revert changes for x2apic support from projects/bhyve.	2013-01-06 05:37:26 +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
asm.h
asmacros.h	Clear DF bit in eflags/rflags on the kernel entry. The i386 and amd64	2010-06-23 20:44:07 +00:00
atomic.h	Add an unified macro to deny ability from the compiler to reorder	2012-10-09 14:32:30 +00:00
bus.h	bhyve import part 2 of 2, guest kernel changes.	2011-05-14 18:37:24 +00:00
bus_dma.h
clock.h	Unsynchronized TSCs on the host require special handling in bhyve:	2013-04-10 05:59:07 +00:00
counter.h	Fix issues with zeroing and fetching the counters, on x86 and ppc64.	2013-07-01 02:48:27 +00:00
cpu.h	Deprecate tsc_present as the last of its real consumers finally disappeared.	2011-03-15 17:19:52 +00:00
cpufunc.h	There is no need for 'start_emulating()' and 'stop_emulating()' to be defined	2013-01-04 02:49:12 +00:00
cputypes.h
db_machdep.h
elf.h	Convert machine/elf.h, machine/frame.h, machine/sigframe.h,	2013-02-20 17:39:52 +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
fdt.h	Add basic support for FDT to i386 & amd64. This change includes:	2013-05-21 03:05:49 +00:00
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
fpu.h	IFC @ r242684	2012-11-11 03:26:14 +00:00
frame.h	Convert machine/elf.h, machine/frame.h, machine/sigframe.h,	2013-02-20 17:39:52 +00:00
gdb_machdep.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	x86 suspend/resume: suspend pics and pseudo-pics in reverse order	2013-02-02 12:02:42 +00:00
iodev.h	MFC r207329, r208716:	2010-06-01 21:19:58 +00:00
kdb.h
limits.h
md_var.h	Fix the hardware watchpoints on SMP amd64. Load the updated %dr	2013-05-21 11:24:32 +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	Add basic support for FDT to i386 & amd64. This change includes:	2013-05-21 03:05:49 +00:00
minidump.h	amd64: introduce minidump version 2	2010-11-11 18:35:28 +00:00
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
ofw_machdep.h	Add basic support for FDT to i386 & amd64. This change includes:	2013-05-21 03:05:49 +00:00
param.h	Rename VM_NDOMAIN into MAXMEMDOM and move it into machine/param.h in	2013-05-07 22:46:24 +00:00
pcb.h	Retire write-only PCB_GS32BIT pcb flag on amd64.	2013-05-09 21:42:43 +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	Fix the hardware watchpoints on SMP amd64. Load the updated %dr	2013-05-21 11:24:32 +00:00
pmap.h	Remove unused macros PTESHIFT, PDESHIFT, PDPESHIFT and PML4ESHIFT.	2013-06-14 00:03:43 +00:00
pmc_mdep.h	Add software PMC support.	2012-03-28 20:58:30 +00:00
ppireg.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
sigframe.h	Convert machine/elf.h, machine/frame.h, machine/sigframe.h,	2013-02-20 17:39:52 +00:00
signal.h	Convert machine/elf.h, machine/frame.h, machine/sigframe.h,	2013-02-20 17:39:52 +00:00
smp.h	Share IPI init and startup code of mp_machdep.c with acpi_wakeup.c	2012-06-12 00:14:54 +00:00
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	Convert machine/elf.h, machine/frame.h, machine/sigframe.h,	2013-02-20 17:39:52 +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
vmm.h	Add RIP-relative addressing to the instruction decoder.	2013-04-25 04:56:43 +00:00
vmm_dev.h	Implement guest vcpu pinning using 'pthread_setaffinity_np(3)'.	2013-02-11 20:36:07 +00:00
vmm_instruction_emul.h	Allow caller to skip 'guest linear address' validation when doing instruction	2013-03-28 21:26:19 +00:00
vmparam.h	Rename VM_NDOMAIN into MAXMEMDOM and move it into machine/param.h in	2013-05-07 22:46:24 +00:00