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authorStefani Seibold <stefani@seibold.net>2014-03-18 02:22:01 +0400
committerH. Peter Anvin <hpa@linux.intel.com>2014-03-18 23:51:52 +0400
commitd2312e3379d581d2c3603357a0181046448e1de3 (patch)
treeab547fa84f977650479eb13dc038bca85acba402 /arch/x86/include/asm/vvar.h
parent1f2cbcf648962cdcf511d234cb39745baa9f5d07 (diff)
downloadlinux-d2312e3379d581d2c3603357a0181046448e1de3.tar.xz
x86, vdso: Make vsyscall_gtod_data handling x86 generic
This patch move the vsyscall_gtod_data handling out of vsyscall_64.c into an additonal file vsyscall_gtod.c to make the functionality available for x86 32 bit kernel. It also adds a new vsyscall_32.c which setup the VVAR page. Reviewed-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Stefani Seibold <stefani@seibold.net> Link: http://lkml.kernel.org/r/1395094933-14252-2-git-send-email-stefani@seibold.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/vvar.h')
-rw-r--r--arch/x86/include/asm/vvar.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index d76ac40da206..0a534eac5f56 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -16,9 +16,6 @@
* you mess up, the linker will catch it.)
*/
-/* Base address of vvars. This is not ABI. */
-#define VVAR_ADDRESS (-10*1024*1024 - 4096)
-
#if defined(__VVAR_KERNEL_LDS)
/* The kernel linker script defines its own magic to put vvars in the
@@ -29,6 +26,15 @@
#else
+extern char __vvar_page;
+
+/* Base address of vvars. This is not ABI. */
+#ifdef CONFIG_X86_64
+#define VVAR_ADDRESS (-10*1024*1024 - 4096)
+#else
+#define VVAR_ADDRESS (&__vvar_page)
+#endif
+
#define DECLARE_VVAR(offset, type, name) \
static type const * const vvaraddr_ ## name = \
(void *)(VVAR_ADDRESS + (offset));