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authorAl Viro <viro@zeniv.linux.org.uk>2008-08-18 03:05:42 +0200
committerH. Peter Anvin <hpa@zytor.com>2008-10-23 07:55:20 +0200
commitbb8985586b7a906e116db835c64773b7a7d51663 (patch)
treede93ae58e88cc563d95cc124a73f3930594c6100 /arch/x86/include/asm/vsyscall.h
parentx86, um: initial part of asm-um move (diff)
downloadlinux-bb8985586b7a906e116db835c64773b7a7d51663.tar.xz
linux-bb8985586b7a906e116db835c64773b7a7d51663.zip
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/include/asm/vsyscall.h')
-rw-r--r--arch/x86/include/asm/vsyscall.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h
new file mode 100644
index 000000000000..dcd4682413de
--- /dev/null
+++ b/arch/x86/include/asm/vsyscall.h
@@ -0,0 +1,44 @@
+#ifndef ASM_X86__VSYSCALL_H
+#define ASM_X86__VSYSCALL_H
+
+enum vsyscall_num {
+ __NR_vgettimeofday,
+ __NR_vtime,
+ __NR_vgetcpu,
+};
+
+#define VSYSCALL_START (-10UL << 20)
+#define VSYSCALL_SIZE 1024
+#define VSYSCALL_END (-2UL << 20)
+#define VSYSCALL_MAPPED_PAGES 1
+#define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr))
+
+#ifdef __KERNEL__
+#include <linux/seqlock.h>
+
+#define __section_vgetcpu_mode __attribute__ ((unused, __section__ (".vgetcpu_mode"), aligned(16)))
+#define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16)))
+
+/* Definitions for CONFIG_GENERIC_TIME definitions */
+#define __section_vsyscall_gtod_data __attribute__ \
+ ((unused, __section__ (".vsyscall_gtod_data"),aligned(16)))
+#define __section_vsyscall_clock __attribute__ \
+ ((unused, __section__ (".vsyscall_clock"),aligned(16)))
+#define __vsyscall_fn \
+ __attribute__ ((unused, __section__(".vsyscall_fn"))) notrace
+
+#define VGETCPU_RDTSCP 1
+#define VGETCPU_LSL 2
+
+extern int __vgetcpu_mode;
+extern volatile unsigned long __jiffies;
+
+/* kernel space (writeable) */
+extern int vgetcpu_mode;
+extern struct timezone sys_tz;
+
+extern void map_vsyscall(void);
+
+#endif /* __KERNEL__ */
+
+#endif /* ASM_X86__VSYSCALL_H */