Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=21a44007745783d8997ed115852a42fb2613bf9a
Commit:     21a44007745783d8997ed115852a42fb2613bf9a
Parent:     c30501e798fad2be81379bac98b6cfe731308f94
Author:     Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 11 11:14:33 2007 +0200
Committer:  Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Thu Oct 11 11:14:33 2007 +0200

    x86_64: prepare shared kernel/vsyscall.c
    
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
 arch/x86_64/kernel/Makefile      |    4 +-
 arch/x86_64/kernel/vsyscall.c    |  349 --------------------------------------
 arch/x86_64/kernel/vsyscall_64.c |  349 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 351 insertions(+), 351 deletions(-)

diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index 14316a2..a5ff38d 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -6,7 +6,7 @@ extra-y         := head.o head64.o init_task.o vmlinux.lds
 EXTRA_AFLAGS   := -traditional
 obj-y  := process.o signal.o entry.o traps_64.o irq.o \
                ptrace.o time.o ioport.o ldt.o setup_64.o i8259_64.o 
sys_x86_64.o \
-               x8664_ksyms.o i387.o syscall.o vsyscall.o \
+               x8664_ksyms.o i387.o syscall.o vsyscall_64.o \
                setup64.o bootflag.o e820_64.o reboot.o quirks.o i8237.o \
                pci-dma_64.o pci-nommu.o alternative.o hpet_64.o tsc.o bugs.o \
                perfctr-watchdog.o
@@ -46,7 +46,7 @@ obj-y                         += intel_cacheinfo.o
 obj-y                          += addon_cpuid_features.o
 obj-y                          += pcspeaker.o
 
-CFLAGS_vsyscall.o              := $(PROFILING) -g0
+CFLAGS_vsyscall_64.o           := $(PROFILING) -g0
 
 therm_throt-y                   += ../../i386/kernel/cpu/mcheck/therm_throt.o
 bootflag-y                     += ../../i386/kernel/bootflag.o
diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
deleted file mode 100644
index 06c3494..0000000
--- a/arch/x86_64/kernel/vsyscall.c
+++ /dev/null
@@ -1,349 +0,0 @@
-/*
- *  linux/arch/x86_64/kernel/vsyscall.c
- *
- *  Copyright (C) 2001 Andrea Arcangeli <[EMAIL PROTECTED]> SuSE
- *  Copyright 2003 Andi Kleen, SuSE Labs.
- *
- *  Thanks to [EMAIL PROTECTED] for some useful hint.
- *  Special thanks to Ingo Molnar for his early experience with
- *  a different vsyscall implementation for Linux/IA32 and for the name.
- *
- *  vsyscall 1 is located at -10Mbyte, vsyscall 2 is located
- *  at virtual address -10Mbyte+1024bytes etc... There are at max 4
- *  vsyscalls. One vsyscall can reserve more than 1 slot to avoid
- *  jumping out of line if necessary. We cannot add more with this
- *  mechanism because older kernels won't return -ENOSYS.
- *  If we want more than four we need a vDSO.
- *
- *  Note: the concept clashes with user mode linux. If you use UML and
- *  want per guest time just set the kernel.vsyscall64 sysctl to 0.
- */
-
-#include <linux/time.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <linux/seqlock.h>
-#include <linux/jiffies.h>
-#include <linux/sysctl.h>
-#include <linux/clocksource.h>
-#include <linux/getcpu.h>
-#include <linux/cpu.h>
-#include <linux/smp.h>
-#include <linux/notifier.h>
-
-#include <asm/vsyscall.h>
-#include <asm/pgtable.h>
-#include <asm/page.h>
-#include <asm/unistd.h>
-#include <asm/fixmap.h>
-#include <asm/errno.h>
-#include <asm/io.h>
-#include <asm/segment.h>
-#include <asm/desc.h>
-#include <asm/topology.h>
-#include <asm/vgtod.h>
-
-#define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr)))
-#define __syscall_clobber "r11","rcx","memory"
-#define __pa_vsymbol(x)                        \
-       ({unsigned long v;              \
-       extern char __vsyscall_0;       \
-         asm("" : "=r" (v) : "0" (x)); \
-         ((v - VSYSCALL_FIRST_PAGE) + __pa_symbol(&__vsyscall_0)); })
-
-/*
- * vsyscall_gtod_data contains data that is :
- * - readonly from vsyscalls
- * - writen by timer interrupt or systcl (/proc/sys/kernel/vsyscall64)
- * Try to keep this structure as small as possible to avoid cache line ping 
pongs
- */
-int __vgetcpu_mode __section_vgetcpu_mode;
-
-struct vsyscall_gtod_data __vsyscall_gtod_data __section_vsyscall_gtod_data =
-{
-       .lock = SEQLOCK_UNLOCKED,
-       .sysctl_enabled = 1,
-};
-
-void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
-{
-       unsigned long flags;
-
-       write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
-       /* copy vsyscall data */
-       vsyscall_gtod_data.clock.vread = clock->vread;
-       vsyscall_gtod_data.clock.cycle_last = clock->cycle_last;
-       vsyscall_gtod_data.clock.mask = clock->mask;
-       vsyscall_gtod_data.clock.mult = clock->mult;
-       vsyscall_gtod_data.clock.shift = clock->shift;
-       vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
-       vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
-       vsyscall_gtod_data.sys_tz = sys_tz;
-       vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
-       vsyscall_gtod_data.wall_to_monotonic = wall_to_monotonic;
-       write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
-}
-
-/* RED-PEN may want to readd seq locking, but then the variable should be
- * write-once.
- */
-static __always_inline void do_get_tz(struct timezone * tz)
-{
-       *tz = __vsyscall_gtod_data.sys_tz;
-}
-
-static __always_inline int gettimeofday(struct timeval *tv, struct timezone 
*tz)
-{
-       int ret;
-       asm volatile("vsysc2: syscall"
-               : "=a" (ret)
-               : "0" (__NR_gettimeofday),"D" (tv),"S" (tz)
-               : __syscall_clobber );
-       return ret;
-}
-
-static __always_inline long time_syscall(long *t)
-{
-       long secs;
-       asm volatile("vsysc1: syscall"
-               : "=a" (secs)
-               : "0" (__NR_time),"D" (t) : __syscall_clobber);
-       return secs;
-}
-
-static __always_inline void do_vgettimeofday(struct timeval * tv)
-{
-       cycle_t now, base, mask, cycle_delta;
-       unsigned seq;
-       unsigned long mult, shift, nsec;
-       cycle_t (*vread)(void);
-       do {
-               seq = read_seqbegin(&__vsyscall_gtod_data.lock);
-
-               vread = __vsyscall_gtod_data.clock.vread;
-               if (unlikely(!__vsyscall_gtod_data.sysctl_enabled || !vread)) {
-                       gettimeofday(tv,NULL);
-                       return;
-               }
-               now = vread();
-               base = __vsyscall_gtod_data.clock.cycle_last;
-               mask = __vsyscall_gtod_data.clock.mask;
-               mult = __vsyscall_gtod_data.clock.mult;
-               shift = __vsyscall_gtod_data.clock.shift;
-
-               tv->tv_sec = __vsyscall_gtod_data.wall_time_sec;
-               nsec = __vsyscall_gtod_data.wall_time_nsec;
-       } while (read_seqretry(&__vsyscall_gtod_data.lock, seq));
-
-       /* calculate interval: */
-       cycle_delta = (now - base) & mask;
-       /* convert to nsecs: */
-       nsec += (cycle_delta * mult) >> shift;
-
-       while (nsec >= NSEC_PER_SEC) {
-               tv->tv_sec += 1;
-               nsec -= NSEC_PER_SEC;
-       }
-       tv->tv_usec = nsec / NSEC_PER_USEC;
-}
-
-int __vsyscall(0) vgettimeofday(struct timeval * tv, struct timezone * tz)
-{
-       if (tv)
-               do_vgettimeofday(tv);
-       if (tz)
-               do_get_tz(tz);
-       return 0;
-}
-
-/* This will break when the xtime seconds get inaccurate, but that is
- * unlikely */
-time_t __vsyscall(1) vtime(time_t *t)
-{
-       struct timeval tv;
-       time_t result;
-       if (unlikely(!__vsyscall_gtod_data.sysctl_enabled))
-               return time_syscall(t);
-
-       vgettimeofday(&tv, 0);
-       result = tv.tv_sec;
-       if (t)
-               *t = result;
-       return result;
-}
-
-/* Fast way to get current CPU and node.
-   This helps to do per node and per CPU caches in user space.
-   The result is not guaranteed without CPU affinity, but usually
-   works out because the scheduler tries to keep a thread on the same
-   CPU.
-
-   tcache must point to a two element sized long array.
-   All arguments can be NULL. */
-long __vsyscall(2)
-vgetcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
-{
-       unsigned int dummy, p;
-       unsigned long j = 0;
-
-       /* Fast cache - only recompute value once per jiffies and avoid
-          relatively costly rdtscp/cpuid otherwise.
-          This works because the scheduler usually keeps the process
-          on the same CPU and this syscall doesn't guarantee its
-          results anyways.
-          We do this here because otherwise user space would do it on
-          its own in a likely inferior way (no access to jiffies).
-          If you don't like it pass NULL. */
-       if (tcache && tcache->blob[0] == (j = __jiffies)) {
-               p = tcache->blob[1];
-       } else if (__vgetcpu_mode == VGETCPU_RDTSCP) {
-               /* Load per CPU data from RDTSCP */
-               rdtscp(dummy, dummy, p);
-       } else {
-               /* Load per CPU data from GDT */
-               asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
-       }
-       if (tcache) {
-               tcache->blob[0] = j;
-               tcache->blob[1] = p;
-       }
-       if (cpu)
-               *cpu = p & 0xfff;
-       if (node)
-               *node = p >> 12;
-       return 0;
-}
-
-long __vsyscall(3) venosys_1(void)
-{
-       return -ENOSYS;
-}
-
-#ifdef CONFIG_SYSCTL
-
-#define SYSCALL 0x050f
-#define NOP2    0x9090
-
-/*
- * NOP out syscall in vsyscall page when not needed.
- */
-static int vsyscall_sysctl_change(ctl_table *ctl, int write, struct file * 
filp,
-                        void __user *buffer, size_t *lenp, loff_t *ppos)
-{
-       extern u16 vsysc1, vsysc2;
-       u16 __iomem *map1;
-       u16 __iomem *map2;
-       int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
-       if (!write)
-               return ret;
-       /* gcc has some trouble with __va(__pa()), so just do it this
-          way. */
-       map1 = ioremap(__pa_vsymbol(&vsysc1), 2);
-       if (!map1)
-               return -ENOMEM;
-       map2 = ioremap(__pa_vsymbol(&vsysc2), 2);
-       if (!map2) {
-               ret = -ENOMEM;
-               goto out;
-       }
-       if (!vsyscall_gtod_data.sysctl_enabled) {
-               writew(SYSCALL, map1);
-               writew(SYSCALL, map2);
-       } else {
-               writew(NOP2, map1);
-               writew(NOP2, map2);
-       }
-       iounmap(map2);
-out:
-       iounmap(map1);
-       return ret;
-}
-
-static int vsyscall_sysctl_nostrat(ctl_table *t, int __user *name, int nlen,
-                               void __user *oldval, size_t __user *oldlenp,
-                               void __user *newval, size_t newlen)
-{
-       return -ENOSYS;
-}
-
-static ctl_table kernel_table2[] = {
-       { .ctl_name = 99, .procname = "vsyscall64",
-         .data = &vsyscall_gtod_data.sysctl_enabled, .maxlen = sizeof(int),
-         .mode = 0644,
-         .strategy = vsyscall_sysctl_nostrat,
-         .proc_handler = vsyscall_sysctl_change },
-       {}
-};
-
-static ctl_table kernel_root_table2[] = {
-       { .ctl_name = CTL_KERN, .procname = "kernel", .mode = 0555,
-         .child = kernel_table2 },
-       {}
-};
-
-#endif
-
-/* Assume __initcall executes before all user space. Hopefully kmod
-   doesn't violate that. We'll find out if it does. */
-static void __cpuinit vsyscall_set_cpu(int cpu)
-{
-       unsigned long *d;
-       unsigned long node = 0;
-#ifdef CONFIG_NUMA
-       node = cpu_to_node[cpu];
-#endif
-       if (cpu_has(&cpu_data[cpu], X86_FEATURE_RDTSCP))
-               write_rdtscp_aux((node << 12) | cpu);
-
-       /* Store cpu number in limit so that it can be loaded quickly
-          in user space in vgetcpu.
-          12 bits for the CPU and 8 bits for the node. */
-       d = (unsigned long *)(cpu_gdt(cpu) + GDT_ENTRY_PER_CPU);
-       *d = 0x0f40000000000ULL;
-       *d |= cpu;
-       *d |= (node & 0xf) << 12;
-       *d |= (node >> 4) << 48;
-}
-
-static void __cpuinit cpu_vsyscall_init(void *arg)
-{
-       /* preemption should be already off */
-       vsyscall_set_cpu(raw_smp_processor_id());
-}
-
-static int __cpuinit
-cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void 
*arg)
-{
-       long cpu = (long)arg;
-       if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN)
-               smp_call_function_single(cpu, cpu_vsyscall_init, NULL, 0, 1);
-       return NOTIFY_DONE;
-}
-
-static void __init map_vsyscall(void)
-{
-       extern char __vsyscall_0;
-       unsigned long physaddr_page0 = __pa_symbol(&__vsyscall_0);
-
-       /* Note that VSYSCALL_MAPPED_PAGES must agree with the code below. */
-       __set_fixmap(VSYSCALL_FIRST_PAGE, physaddr_page0, PAGE_KERNEL_VSYSCALL);
-}
-
-static int __init vsyscall_init(void)
-{
-       BUG_ON(((unsigned long) &vgettimeofday !=
-                       VSYSCALL_ADDR(__NR_vgettimeofday)));
-       BUG_ON((unsigned long) &vtime != VSYSCALL_ADDR(__NR_vtime));
-       BUG_ON((VSYSCALL_ADDR(0) != __fix_to_virt(VSYSCALL_FIRST_PAGE)));
-       BUG_ON((unsigned long) &vgetcpu != VSYSCALL_ADDR(__NR_vgetcpu));
-       map_vsyscall();
-#ifdef CONFIG_SYSCTL
-       register_sysctl_table(kernel_root_table2);
-#endif
-       on_each_cpu(cpu_vsyscall_init, NULL, 0, 1);
-       hotcpu_notifier(cpu_vsyscall_notifier, 0);
-       return 0;
-}
-
-__initcall(vsyscall_init);
diff --git a/arch/x86_64/kernel/vsyscall_64.c b/arch/x86_64/kernel/vsyscall_64.c
new file mode 100644
index 0000000..06c3494
--- /dev/null
+++ b/arch/x86_64/kernel/vsyscall_64.c
@@ -0,0 +1,349 @@
+/*
+ *  linux/arch/x86_64/kernel/vsyscall.c
+ *
+ *  Copyright (C) 2001 Andrea Arcangeli <[EMAIL PROTECTED]> SuSE
+ *  Copyright 2003 Andi Kleen, SuSE Labs.
+ *
+ *  Thanks to [EMAIL PROTECTED] for some useful hint.
+ *  Special thanks to Ingo Molnar for his early experience with
+ *  a different vsyscall implementation for Linux/IA32 and for the name.
+ *
+ *  vsyscall 1 is located at -10Mbyte, vsyscall 2 is located
+ *  at virtual address -10Mbyte+1024bytes etc... There are at max 4
+ *  vsyscalls. One vsyscall can reserve more than 1 slot to avoid
+ *  jumping out of line if necessary. We cannot add more with this
+ *  mechanism because older kernels won't return -ENOSYS.
+ *  If we want more than four we need a vDSO.
+ *
+ *  Note: the concept clashes with user mode linux. If you use UML and
+ *  want per guest time just set the kernel.vsyscall64 sysctl to 0.
+ */
+
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/seqlock.h>
+#include <linux/jiffies.h>
+#include <linux/sysctl.h>
+#include <linux/clocksource.h>
+#include <linux/getcpu.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/notifier.h>
+
+#include <asm/vsyscall.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/unistd.h>
+#include <asm/fixmap.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <asm/segment.h>
+#include <asm/desc.h>
+#include <asm/topology.h>
+#include <asm/vgtod.h>
+
+#define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr)))
+#define __syscall_clobber "r11","rcx","memory"
+#define __pa_vsymbol(x)                        \
+       ({unsigned long v;              \
+       extern char __vsyscall_0;       \
+         asm("" : "=r" (v) : "0" (x)); \
+         ((v - VSYSCALL_FIRST_PAGE) + __pa_symbol(&__vsyscall_0)); })
+
+/*
+ * vsyscall_gtod_data contains data that is :
+ * - readonly from vsyscalls
+ * - writen by timer interrupt or systcl (/proc/sys/kernel/vsyscall64)
+ * Try to keep this structure as small as possible to avoid cache line ping 
pongs
+ */
+int __vgetcpu_mode __section_vgetcpu_mode;
+
+struct vsyscall_gtod_data __vsyscall_gtod_data __section_vsyscall_gtod_data =
+{
+       .lock = SEQLOCK_UNLOCKED,
+       .sysctl_enabled = 1,
+};
+
+void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
+{
+       unsigned long flags;
+
+       write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
+       /* copy vsyscall data */
+       vsyscall_gtod_data.clock.vread = clock->vread;
+       vsyscall_gtod_data.clock.cycle_last = clock->cycle_last;
+       vsyscall_gtod_data.clock.mask = clock->mask;
+       vsyscall_gtod_data.clock.mult = clock->mult;
+       vsyscall_gtod_data.clock.shift = clock->shift;
+       vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
+       vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
+       vsyscall_gtod_data.sys_tz = sys_tz;
+       vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
+       vsyscall_gtod_data.wall_to_monotonic = wall_to_monotonic;
+       write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
+}
+
+/* RED-PEN may want to readd seq locking, but then the variable should be
+ * write-once.
+ */
+static __always_inline void do_get_tz(struct timezone * tz)
+{
+       *tz = __vsyscall_gtod_data.sys_tz;
+}
+
+static __always_inline int gettimeofday(struct timeval *tv, struct timezone 
*tz)
+{
+       int ret;
+       asm volatile("vsysc2: syscall"
+               : "=a" (ret)
+               : "0" (__NR_gettimeofday),"D" (tv),"S" (tz)
+               : __syscall_clobber );
+       return ret;
+}
+
+static __always_inline long time_syscall(long *t)
+{
+       long secs;
+       asm volatile("vsysc1: syscall"
+               : "=a" (secs)
+               : "0" (__NR_time),"D" (t) : __syscall_clobber);
+       return secs;
+}
+
+static __always_inline void do_vgettimeofday(struct timeval * tv)
+{
+       cycle_t now, base, mask, cycle_delta;
+       unsigned seq;
+       unsigned long mult, shift, nsec;
+       cycle_t (*vread)(void);
+       do {
+               seq = read_seqbegin(&__vsyscall_gtod_data.lock);
+
+               vread = __vsyscall_gtod_data.clock.vread;
+               if (unlikely(!__vsyscall_gtod_data.sysctl_enabled || !vread)) {
+                       gettimeofday(tv,NULL);
+                       return;
+               }
+               now = vread();
+               base = __vsyscall_gtod_data.clock.cycle_last;
+               mask = __vsyscall_gtod_data.clock.mask;
+               mult = __vsyscall_gtod_data.clock.mult;
+               shift = __vsyscall_gtod_data.clock.shift;
+
+               tv->tv_sec = __vsyscall_gtod_data.wall_time_sec;
+               nsec = __vsyscall_gtod_data.wall_time_nsec;
+       } while (read_seqretry(&__vsyscall_gtod_data.lock, seq));
+
+       /* calculate interval: */
+       cycle_delta = (now - base) & mask;
+       /* convert to nsecs: */
+       nsec += (cycle_delta * mult) >> shift;
+
+       while (nsec >= NSEC_PER_SEC) {
+               tv->tv_sec += 1;
+               nsec -= NSEC_PER_SEC;
+       }
+       tv->tv_usec = nsec / NSEC_PER_USEC;
+}
+
+int __vsyscall(0) vgettimeofday(struct timeval * tv, struct timezone * tz)
+{
+       if (tv)
+               do_vgettimeofday(tv);
+       if (tz)
+               do_get_tz(tz);
+       return 0;
+}
+
+/* This will break when the xtime seconds get inaccurate, but that is
+ * unlikely */
+time_t __vsyscall(1) vtime(time_t *t)
+{
+       struct timeval tv;
+       time_t result;
+       if (unlikely(!__vsyscall_gtod_data.sysctl_enabled))
+               return time_syscall(t);
+
+       vgettimeofday(&tv, 0);
+       result = tv.tv_sec;
+       if (t)
+               *t = result;
+       return result;
+}
+
+/* Fast way to get current CPU and node.
+   This helps to do per node and per CPU caches in user space.
+   The result is not guaranteed without CPU affinity, but usually
+   works out because the scheduler tries to keep a thread on the same
+   CPU.
+
+   tcache must point to a two element sized long array.
+   All arguments can be NULL. */
+long __vsyscall(2)
+vgetcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
+{
+       unsigned int dummy, p;
+       unsigned long j = 0;
+
+       /* Fast cache - only recompute value once per jiffies and avoid
+          relatively costly rdtscp/cpuid otherwise.
+          This works because the scheduler usually keeps the process
+          on the same CPU and this syscall doesn't guarantee its
+          results anyways.
+          We do this here because otherwise user space would do it on
+          its own in a likely inferior way (no access to jiffies).
+          If you don't like it pass NULL. */
+       if (tcache && tcache->blob[0] == (j = __jiffies)) {
+               p = tcache->blob[1];
+       } else if (__vgetcpu_mode == VGETCPU_RDTSCP) {
+               /* Load per CPU data from RDTSCP */
+               rdtscp(dummy, dummy, p);
+       } else {
+               /* Load per CPU data from GDT */
+               asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
+       }
+       if (tcache) {
+               tcache->blob[0] = j;
+               tcache->blob[1] = p;
+       }
+       if (cpu)
+               *cpu = p & 0xfff;
+       if (node)
+               *node = p >> 12;
+       return 0;
+}
+
+long __vsyscall(3) venosys_1(void)
+{
+       return -ENOSYS;
+}
+
+#ifdef CONFIG_SYSCTL
+
+#define SYSCALL 0x050f
+#define NOP2    0x9090
+
+/*
+ * NOP out syscall in vsyscall page when not needed.
+ */
+static int vsyscall_sysctl_change(ctl_table *ctl, int write, struct file * 
filp,
+                        void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       extern u16 vsysc1, vsysc2;
+       u16 __iomem *map1;
+       u16 __iomem *map2;
+       int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
+       if (!write)
+               return ret;
+       /* gcc has some trouble with __va(__pa()), so just do it this
+          way. */
+       map1 = ioremap(__pa_vsymbol(&vsysc1), 2);
+       if (!map1)
+               return -ENOMEM;
+       map2 = ioremap(__pa_vsymbol(&vsysc2), 2);
+       if (!map2) {
+               ret = -ENOMEM;
+               goto out;
+       }
+       if (!vsyscall_gtod_data.sysctl_enabled) {
+               writew(SYSCALL, map1);
+               writew(SYSCALL, map2);
+       } else {
+               writew(NOP2, map1);
+               writew(NOP2, map2);
+       }
+       iounmap(map2);
+out:
+       iounmap(map1);
+       return ret;
+}
+
+static int vsyscall_sysctl_nostrat(ctl_table *t, int __user *name, int nlen,
+                               void __user *oldval, size_t __user *oldlenp,
+                               void __user *newval, size_t newlen)
+{
+       return -ENOSYS;
+}
+
+static ctl_table kernel_table2[] = {
+       { .ctl_name = 99, .procname = "vsyscall64",
+         .data = &vsyscall_gtod_data.sysctl_enabled, .maxlen = sizeof(int),
+         .mode = 0644,
+         .strategy = vsyscall_sysctl_nostrat,
+         .proc_handler = vsyscall_sysctl_change },
+       {}
+};
+
+static ctl_table kernel_root_table2[] = {
+       { .ctl_name = CTL_KERN, .procname = "kernel", .mode = 0555,
+         .child = kernel_table2 },
+       {}
+};
+
+#endif
+
+/* Assume __initcall executes before all user space. Hopefully kmod
+   doesn't violate that. We'll find out if it does. */
+static void __cpuinit vsyscall_set_cpu(int cpu)
+{
+       unsigned long *d;
+       unsigned long node = 0;
+#ifdef CONFIG_NUMA
+       node = cpu_to_node[cpu];
+#endif
+       if (cpu_has(&cpu_data[cpu], X86_FEATURE_RDTSCP))
+               write_rdtscp_aux((node << 12) | cpu);
+
+       /* Store cpu number in limit so that it can be loaded quickly
+          in user space in vgetcpu.
+          12 bits for the CPU and 8 bits for the node. */
+       d = (unsigned long *)(cpu_gdt(cpu) + GDT_ENTRY_PER_CPU);
+       *d = 0x0f40000000000ULL;
+       *d |= cpu;
+       *d |= (node & 0xf) << 12;
+       *d |= (node >> 4) << 48;
+}
+
+static void __cpuinit cpu_vsyscall_init(void *arg)
+{
+       /* preemption should be already off */
+       vsyscall_set_cpu(raw_smp_processor_id());
+}
+
+static int __cpuinit
+cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void 
*arg)
+{
+       long cpu = (long)arg;
+       if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN)
+               smp_call_function_single(cpu, cpu_vsyscall_init, NULL, 0, 1);
+       return NOTIFY_DONE;
+}
+
+static void __init map_vsyscall(void)
+{
+       extern char __vsyscall_0;
+       unsigned long physaddr_page0 = __pa_symbol(&__vsyscall_0);
+
+       /* Note that VSYSCALL_MAPPED_PAGES must agree with the code below. */
+       __set_fixmap(VSYSCALL_FIRST_PAGE, physaddr_page0, PAGE_KERNEL_VSYSCALL);
+}
+
+static int __init vsyscall_init(void)
+{
+       BUG_ON(((unsigned long) &vgettimeofday !=
+                       VSYSCALL_ADDR(__NR_vgettimeofday)));
+       BUG_ON((unsigned long) &vtime != VSYSCALL_ADDR(__NR_vtime));
+       BUG_ON((VSYSCALL_ADDR(0) != __fix_to_virt(VSYSCALL_FIRST_PAGE)));
+       BUG_ON((unsigned long) &vgetcpu != VSYSCALL_ADDR(__NR_vgetcpu));
+       map_vsyscall();
+#ifdef CONFIG_SYSCTL
+       register_sysctl_table(kernel_root_table2);
+#endif
+       on_each_cpu(cpu_vsyscall_init, NULL, 0, 1);
+       hotcpu_notifier(cpu_vsyscall_notifier, 0);
+       return 0;
+}
+
+__initcall(vsyscall_init);
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