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2aae950b21
linux/include/asm-x86_64
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Andi Kleen 2aae950b21 x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu 
This implements new vDSO for x86-64.  The concept is similar
to the existing vDSOs on i386 and PPC.  x86-64 has had static
vsyscalls before,  but these are not flexible enough anymore.

A vDSO is a ELF shared library supplied by the kernel that is mapped into
user address space.  The vDSO mapping is randomized for each process
for security reasons.

Doing this was needed for clock_gettime, because clock_gettime
always needs a syscall fallback and having one at a fixed
address would have made buffer overflow exploits too easy to write.

The vdso can be disabled with vdso=0

It currently includes a new gettimeofday implemention and optimized
clock_gettime(). The gettimeofday implementation is slightly faster
than the one in the old vsyscall.  clock_gettime is significantly faster
than the syscall for CLOCK_MONOTONIC and CLOCK_REALTIME.

The new calls are generally faster than the old vsyscall.

Advantages over the old x86-64 vsyscalls:
- Extensible
- Randomized
- Cleaner
- Easier to virtualize (the old static address range previously causes
overhead e.g. for Xen because it has to create special page tables for it)

Weak points:
- glibc support still to be written

The VM interface is partly based on Ingo Molnar's i386 version.

Includes compile fix from Joachim Deguara

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-21 18:37:08 -07:00
..
8253pit.h
a.out.h arch: personality independent stack top 2007-07-19 10:04:45 -07:00
acpi.h ACPICA: Allow ACPI id to be u32 instead of u8. 2007-02-02 21:14:31 -05:00
agp.h [AGPGART] Move [un]map_page_into_agp into asm/agp.h 2007-04-26 14:22:50 -04:00
alternative-asm.i Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
alternative.h Unify the CPU features vectors between i386 and x86-64 2007-07-12 10:55:54 -07:00
apic.h [PATCH] x86-64: safe_apic_wait_icr_idle - x86_64 2007-05-02 19:27:17 +02:00
apicdef.h
atomic.h x86: create asm/cmpxchg.h 2007-05-08 11:15:20 -07:00
auxvec.h x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu 2007-07-21 18:37:08 -07:00
bitops.h [PATCH] x86-64: Fix wrong gcc check in bitops.h 2007-02-13 13:26:25 +01:00
boot.h Make struct boot_params a real structure, and remove obsolete fields 2007-07-12 10:55:54 -07:00
bootparam.h Make struct boot_params a real structure, and remove obsolete fields 2007-07-12 10:55:54 -07:00
bootsetup.h [PATCH] Dynamic kernel command-line: x86_64 2007-02-12 09:48:39 -08:00
bug.h [PATCH] Generic BUG for x86-64 2006-12-08 08:28:39 -08:00
bugs.h [PATCH] x86-64: Clean up asm-x86_64/bugs.h 2007-05-02 19:27:12 +02:00
byteorder.h
cache.h fix file specification in comments 2006-10-03 23:01:26 +02:00
cacheflush.h [PATCH] Optimize D-cache alias handling on fork 2006-12-13 09:27:08 -08:00
calgary.h Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
calling.h
checksum.h [NET]: X86_64 checksum annotations and cleanups. 2006-12-02 21:23:14 -08:00
cmpxchg.h x86: create asm/cmpxchg.h 2007-05-08 11:15:20 -07:00
compat.h Introduce compat_u64 and compat_s64 types 2007-07-16 09:05:48 -07:00
cpu.h
cpufeature.h Unify the CPU features vectors between i386 and x86-64 2007-07-12 10:55:54 -07:00
cputime.h
current.h
debugreg.h
delay.h [PATCH] x86: comment magic constants in delay.h 2006-12-07 02:14:07 +01:00
desc_defs.h [PATCH] x86-64: Extract segment descriptor definitions for use outside 2006-12-07 02:14:04 +01:00
desc.h [PATCH] x86-64: Introduce load_TLS to the "for" loop. 2007-05-02 19:27:09 +02:00
device.h ACPI: Change ACPI to use dev_archdata instead of firmware_data 2006-12-01 14:52:01 -08:00
div64.h
dma-mapping.h [PATCH] x86-64: dma_ops as const 2007-05-02 19:27:06 +02:00
dma.h [PATCH] x86_64: Remove long obsolete CVS 2006-06-26 10:48:16 -07:00
dmi.h
dwarf2.h [PATCH] i386/x86-64: Work around gcc bug with noreturn functions in unwinder 2006-09-26 10:52:41 +02:00
e820.h Make definitions for struct e820entry and struct e820map consistent 2007-07-12 10:55:54 -07:00
edac.h
elf.h x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu 2007-07-21 18:37:08 -07:00
emergency-restart.h
errno.h
fb.h fbdev: detect primary display device 2007-07-17 10:23:11 -07:00
fcntl.h
fixmap.h serial: convert early_uart to earlycon for 8250 2007-07-16 09:05:35 -07:00
floppy.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
fpu32.h
futex.h [PATCH] mm: pagefault_{disable,enable}() 2006-12-07 08:39:21 -08:00
genapic.h [PATCH] x86-64: always use physical delivery mode on > 8 CPUs 2007-05-02 19:27:04 +02:00
hardirq.h [PATCH] genirq: irq: generalize the check for HARDIRQ_BITS 2006-10-04 07:55:28 -07:00
hpet.h [PATCH] time: x86_64: split x86_64/kernel/time.c up 2007-02-16 08:14:00 -08:00
hw_irq.h [PATCH] x86_64 irq: Fix comments after changing IRQ0_VECTOR from 0x20 to 0x30 2007-03-29 08:16:23 -07:00
hypertransport.h [PATCH] Initial generic hypertransport interrupt support 2006-10-04 07:55:29 -07:00
i387.h [PATCH] Add __must_check to copy_*_user 2006-09-26 10:52:39 +02:00
ia32_unistd.h [PATCH] x86_64: Remove most of ia32_unistd.h 2006-06-26 10:48:15 -07:00
ia32.h
ide.h
idle.h
intel_arch_perfmon.h [PATCH] x86: i386/x86-64 Add nmi watchdog support for new Intel CPUs 2006-09-26 10:52:27 +02:00
io_apic.h [PATCH] io_apic.h needs apicdef.h 2007-03-05 07:57:50 -08:00
io.h serial: convert early_uart to earlycon for 8250 2007-07-16 09:05:35 -07:00
ioctl.h
ioctls.h [PATCH] termios: Enable new style termios ioctls on x86-64 2006-12-08 08:28:57 -08:00
ipcbuf.h
ipi.h [PATCH] x86-64: Use safe_apic_wait_icr_idle in __send_IPI_dest_field - x86_64 2007-05-02 19:27:18 +02:00
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
irq.h [PATCH] genirq: x86_64 irq: make vector_irq per cpu 2006-10-04 07:55:29 -07:00
irqflags.h [PATCH] x86-64: Use X86_EFLAGS_IF in x86-64/irqflags.h. 2007-05-02 19:27:11 +02:00
k8.h [PATCH] x86_64: Clean and enhance up K8 northbridge access code 2006-06-26 10:48:15 -07:00
Kbuild consolidate asm/const.h to linux/const.h 2007-05-08 11:15:13 -07:00
kdebug.h Revert "ipmi: add new IPMI nmi watchdog handling" 2007-05-14 15:24:24 -07:00
kexec.h kdump/kexec: calculate note size at compile time 2007-05-08 11:15:07 -07:00
kmap_types.h
kprobes.h jprobes: remove JPROBE_ENTRY() 2007-07-19 10:04:44 -07:00
ldt.h
linkage.h [PATCH] Add proper alignment to ENTRY 2006-09-26 10:52:29 +02:00
local.h local_t: x86_64 extension 2007-05-08 11:15:20 -07:00
mach_apic.h [PATCH] x86_64 irq: Allocate a vector across all cpus for genapic_flat. 2006-10-08 12:24:02 -07:00
mc146818rtc.h
mce.h [PATCH] x86-64: Allow to run a program when a machine check event is detected 2007-02-13 13:26:23 +01:00
mman.h
mmsegment.h
mmu_context.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mmu.h x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu 2007-07-21 18:37:08 -07:00
mmzone.h [PATCH] x86-64: configurable fake numa node sizes 2007-05-02 19:27:09 +02:00
module.h
mpspec.h [PATCH] Replace mp bus array with bitmap for bus not pci 2006-09-26 10:52:30 +02:00
msgbuf.h
msidef.h [PATCH] genirq: x86_64 irq: Move msi message composition into io_apic.c 2006-10-04 07:55:28 -07:00
msr-index.h [PATCH] x86: Clean up x86 control register and MSR macros (corrected) 2007-05-02 19:27:12 +02:00
msr.h i386: Add safe variants of rdmsr_on_cpu and wrmsr_on_cpu 2007-05-08 17:22:01 +02:00
mtrr.h [PATCH] x86: Save the MTRRs of the BSP before booting an AP 2007-05-02 19:27:17 +02:00
mutex.h [PATCH] x86-64: Remove fastcall references in x86_64 code 2007-02-13 13:26:22 +01:00
namei.h
nmi.h [PATCH] x86-64: Use the 32bit wd_ops for 64bit too. 2007-05-02 19:27:20 +02:00
node.h
numa.h
page.h Add __GFP_MOVABLE for callers to flag allocations from high memory that may be migrated 2007-07-17 10:22:59 -07:00
param.h
parport.h
pci-direct.h [PATCH] x86: add write_pci_config_byte() to direct PCI access routines 2006-12-07 02:14:10 +01:00
pci.h PCI: remove pci_dac_dma_... APIs 2007-07-11 16:02:11 -07:00
pda.h [PATCH] x86-64: Fix race in exit_idle 2006-11-14 16:57:46 +01:00
percpu.h define new percpu interface for shared data 2007-07-19 10:04:44 -07:00
pgalloc.h [PATCH] x86-64: use lru instead of page->index and page->private for pgd lists management. 2007-05-02 19:27:10 +02:00
pgtable.h mm: remove ptep_test_and_clear_dirty and ptep_clear_flush_dirty 2007-07-17 10:22:59 -07:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
posix_types.h
prctl.h
processor-flags.h [PATCH] x86: Clean up x86 control register and MSR macros (corrected) 2007-05-02 19:27:12 +02:00
processor.h Use a new CPU feature word to cover features that are spread around 2007-07-12 10:55:54 -07:00
proto.h [PATCH] x86-64: Move mtrr prototypes from proto.h to mtrr.h 2007-05-02 19:27:17 +02:00
ptrace-abi.h [PATCH] Split i386 and x86_64 ptrace.h 2006-09-26 08:49:10 -07:00
ptrace.h x86_64: asm/ptrace.h needs linux/compiler.h 2007-07-21 18:37:07 -07:00
required-features.h Use a new CPU feature word to cover features that are spread around 2007-07-12 10:55:54 -07:00
resource.h
rio.h [PATCH] Calgary: check BBAR ioremap success when ioremapping 2006-12-07 02:14:06 +01:00
rtc.h
rwlock.h [PATCH] Clean up spin/rwlocks 2006-09-26 10:52:32 +02:00
scatterlist.h PCI: scatterlist.h needs types.h 2007-05-02 19:02:34 -07:00
seccomp.h
sections.h
segment.h x86-64: add symbolic constants for the boot segment selectors 2007-07-12 10:55:54 -07:00
semaphore.h [PATCH] Use early clobber in semaphores 2006-09-30 01:47:55 +02:00
sembuf.h
serial.h x86, serial: convert legacy COM ports to platform devices 2007-05-08 11:15:23 -07:00
setup.h [PATCH] x86_64: 2048-byte command line 2007-02-12 09:48:39 -08:00
shmbuf.h
shmparam.h
sigcontext32.h
sigcontext.h
siginfo.h
signal.h [PATCH] Add TIF_RESTORE_SIGMASK 2006-09-26 10:52:26 +02:00
smp.h Use the APIC to determine the hardware processor id - x86_64 2007-05-09 12:30:48 -07:00
socket.h [NET]: Adding SO_TIMESTAMPNS / SCM_TIMESTAMPNS support 2007-04-25 22:24:21 -07:00
sockios.h [NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution 2007-04-25 22:24:04 -07:00
sparsemem.h
spinlock_types.h [PATCH] Remove 'volatile' from spinlock_types 2006-12-06 14:39:53 -08:00
spinlock.h [PATCH] x86-64: Don't keep interrupts disabled while spinning in spinlocks 2006-12-07 02:14:00 +01:00
stacktrace.h [PATCH] x86: add sysctl for kstack_depth_to_print 2006-12-07 02:14:11 +01:00
stat.h
statfs.h
string.h x86_64: Always use builtin memcpy on gcc 4.3 2007-07-21 18:37:08 -07:00
suspend.h [PATCH] x86-64: wakeup.S rename registers to reflect right names 2007-05-02 19:27:07 +02:00
swiotlb.h Revert "[IA64] swiotlb abstraction (e.g. for Xen)" 2007-03-06 13:31:45 -08:00
system.h x86_64: wbinvd macro fix 2007-07-21 17:49:13 -07:00
tce.h [PATCH] Calgary IOMMU: consolidate per bus data structures 2006-09-26 10:52:31 +02:00
termbits.h tty: i386/x86_64 arbitary speed support 2007-05-08 11:15:03 -07:00
termios.h [PATCH] consolidate line discipline number definitions 2007-02-11 10:51:26 -08:00
therm_throt.h [PATCH] x86: Refactor thermal throttle processing 2006-09-26 10:52:42 +02:00
thread_info.h wrap access to thread_info 2007-05-09 12:30:56 -07:00
timex.h [PATCH] x86: Log reason why TSC was marked unstable 2007-05-02 19:27:08 +02:00
tlb.h
tlbflush.h Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
topology.h [PATCH] sched: remove SMT nice 2007-03-05 07:57:51 -08:00
tsc.h [PATCH] i386: make x86_64 tsc header require i386 rather than vice-versa 2007-03-06 09:30:24 -08:00
types.h [PATCH] Centralise definitions of sector_t and blkcnt_t 2006-12-04 19:41:15 -08:00
uaccess.h [PATCH] kill bogus casts in amd64 uaccess.h 2007-03-14 15:27:50 -07:00
ucontext.h
unaligned.h
unistd.h sys_fallocate() implementation on i386, x86_64 and powerpc 2007-07-17 21:42:44 -04:00
unwind.h Remove stack unwinder for now 2006-12-15 08:47:51 -08:00
user32.h
user.h
vga.h
vgtod.h x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu 2007-07-21 18:37:08 -07:00
vsyscall32.h
vsyscall.h x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu 2007-07-21 18:37:08 -07:00
xor.h