lkml.org 
[lkml]   [2011]   [Dec]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] Extend VVAR support to multiple pages
Date
Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Kumar Sundararajan <kumar@fb.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Andy Lutomirski <luto@MIT.EDU>
Cc: linux-kernel@vger.kernel.org
---
arch/x86/include/asm/fixmap.h | 1 +
arch/x86/include/asm/vvar.h | 3 ++-
arch/x86/kernel/vmlinux.lds.S | 2 +-
arch/x86/kernel/vsyscall_64.c | 1 +
4 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index 460c74e..6441527 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -78,6 +78,7 @@ enum fixed_addresses {
VSYSCALL_LAST_PAGE,
VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
+ ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
+ VVAR_PAGE2,
VVAR_PAGE,
VSYSCALL_HPET,
#endif
diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index de656ac..0fd7a4a 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -17,7 +17,8 @@
*/

/* Base address of vvars. This is not ABI. */
-#define VVAR_ADDRESS (-10*1024*1024 - 4096)
+#define VVAR_NUM_PAGES 2
+#define VVAR_ADDRESS (-10*1024*1024 - VVAR_NUM_PAGES * 4096)

#if defined(__VVAR_KERNEL_LDS)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 0f703f1..70c52de 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -171,7 +171,7 @@ SECTIONS

} :data

- . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
+ . = ALIGN(__vvar_page + VVAR_NUM_PAGES*PAGE_SIZE, PAGE_SIZE);

#endif /* CONFIG_X86_64 */

diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index e4d4a22..7960d3a 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -282,6 +282,7 @@ void __init map_vsyscall(void)
(unsigned long)VSYSCALL_START);

__set_fixmap(VVAR_PAGE, physaddr_vvar_page, PAGE_KERNEL_VVAR);
+ __set_fixmap(VVAR_PAGE2, physaddr_vvar_page + PAGE_SIZE, PAGE_KERNEL_VVAR);
BUILD_BUG_ON((unsigned long)__fix_to_virt(VVAR_PAGE) !=
(unsigned long)VVAR_ADDRESS);
}
--
1.7.4


\
 
 \ /
  Last update: 2011-12-19 20:53    [W:0.191 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site