diff options
Diffstat (limited to 'arch/x86/include/asm/vvar.h')
| -rw-r--r-- | arch/x86/include/asm/vvar.h | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h deleted file mode 100644 index 3f32dfc2ab73..000000000000 --- a/arch/x86/include/asm/vvar.h +++ /dev/null @@ -1,51 +0,0 @@ -/* - * 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) - -#else - -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 - -#endif - -/* DECLARE_VVAR(offset, type, name) */ - -DECLARE_VVAR(128, struct vsyscall_gtod_data, vsyscall_gtod_data) - -#undef DECLARE_VVAR - -#endif |
