blob: 3f32dfc2ab7350b6130bcfca317932f431d6cb99 [file] [log] [blame]
* vvar.h: Shared vDSO/kernel variable declarations
* Copyright (c) 2011 Andy Lutomirski
* Subject to the GNU General Public License, version 2
* A handful of variables are accessible (read-only) from userspace
* code in the vsyscall page and the vdso. They are declared here.
* Some other file must define them with DEFINE_VVAR.
* In normal kernel code, they are used like any other variable.
* In user code, they are accessed through the VVAR macro.
* These variables live in a page of kernel data that has an extra RO
* mapping for userspace. Each variable needs a unique offset within
* that page; specify that offset with the DECLARE_VVAR macro. (If
* you mess up, the linker will catch it.)
#ifndef _ASM_X86_VVAR_H
#define _ASM_X86_VVAR_H
#if defined(__VVAR_KERNEL_LDS)
/* The kernel linker script defines its own magic to put vvars in the
* right place.
#define DECLARE_VVAR(offset, type, name) \
EMIT_VVAR(name, offset)
extern char __vvar_page;
#define DECLARE_VVAR(offset, type, name) \
extern type vvar_ ## name __attribute__((visibility("hidden")));
#define VVAR(name) (vvar_ ## name)
#define DEFINE_VVAR(type, name) \
type name \
__attribute__((section(".vvar_" #name), aligned(16))) __visible
/* DECLARE_VVAR(offset, type, name) */
DECLARE_VVAR(128, struct vsyscall_gtod_data, vsyscall_gtod_data)