#include <linux/jiffies.h>
#include <linux/sysctl.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/topology.h>
#define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr)))
+#define __syscall_clobber "r11","rcx","memory"
int __sysctl_vsyscall __section_sysctl_vsyscall = 1;
seqlock_t __xtime_lock __section_xtime_lock = SEQLOCK_UNLOCKED;
sequence = read_seqbegin(&__xtime_lock);
sec = __xtime.tv_sec;
- usec = (__xtime.tv_nsec / 1000) +
- (__jiffies - __wall_jiffies) * (1000000 / HZ);
+ usec = __xtime.tv_nsec / 1000;
if (__vxtime.mode != VXTIME_HPET) {
t = get_cycles_sync();
__vxtime.tsc_quot) >> 32;
/* See comment in x86_64 do_gettimeofday. */
} else {
- usec += ((readl((void *)fix_to_virt(VSYSCALL_HPET) + 0xf0) -
+ usec += ((readl((void __iomem *)
+ fix_to_virt(VSYSCALL_HPET) + 0xf0) -
__vxtime.last) * __vxtime.quot) >> 32;
}
} while (read_seqretry(&__xtime_lock, sequence));
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->t0 == (j = __jiffies)) {
- p = tcache->t1;
+ 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);
asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
}
if (tcache) {
- tcache->t0 = j;
- tcache->t1 = p;
+ tcache->blob[0] = j;
+ tcache->blob[1] = p;
}
if (cpu)
*cpu = p & 0xfff;
void __user *buffer, size_t *lenp, loff_t *ppos)
{
extern u16 vsysc1, vsysc2;
- u16 *map1, *map2;
+ u16 __iomem *map1;
+ u16 __iomem *map2;
int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
if (!write)
return ret;
goto out;
}
if (!sysctl_vsyscall) {
- *map1 = SYSCALL;
- *map2 = SYSCALL;
+ writew(SYSCALL, map1);
+ writew(SYSCALL, map2);
} else {
- *map1 = NOP2;
- *map2 = NOP2;
+ writew(NOP2, map1);
+ writew(NOP2, map2);
}
iounmap(map2);
out:
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,
- void **context)
+ void __user *newval, size_t newlen)
{
return -ENOSYS;
}
#endif
-static void __cpuinit write_rdtscp_cb(void *info)
-{
- write_rdtscp_aux((unsigned long)info);
-}
-
-void __cpuinit vsyscall_set_cpu(int cpu)
+/* 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)) {
- void *info = (void *)((node << 12) | cpu);
- /* Can happen on preemptive kernel */
- if (get_cpu() == cpu)
- write_rdtscp_cb(info);
-#ifdef CONFIG_SMP
- else {
- /* the notifier is unfortunately not executed on the
- target CPU */
- smp_call_function_single(cpu,write_rdtscp_cb,info,0,1);
- }
-#endif
- put_cpu();
- }
+ 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.
*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)
+ 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);
}
#ifdef CONFIG_SYSCTL
register_sysctl_table(kernel_root_table2, 0);
#endif
+ on_each_cpu(cpu_vsyscall_init, NULL, 0, 1);
+ hotcpu_notifier(cpu_vsyscall_notifier, 0);
return 0;
}