x86/asm/boot/64: Use __BOOT_TSS instead of literal $0x20
authorDenys Vlasenko <dvlasenk@redhat.com>
Wed, 1 Apr 2015 14:50:58 +0000 (16:50 +0200)
committerIngo Molnar <mingo@kernel.org>
Thu, 2 Apr 2015 10:00:20 +0000 (12:00 +0200)
__BOOT_TSS = (GDT_ENTRY_BOOT_TSS * 8)
GDT_ENTRY_BOOT_TSS = (GDT_ENTRY_BOOT_CS + 2)
GDT_ENTRY_BOOT_CS = 2

(2 + 2) * 8 = 4 * 8 = 32 = 0x20

No code changes.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1427899858-7165-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/boot/compressed/head_64.S

index 90c1521..b0c0d16 100644 (file)
@@ -165,7 +165,7 @@ ENTRY(startup_32)
        /* After gdt is loaded */
        xorl    %eax, %eax
        lldt    %ax
-       movl    $0x20, %eax
+       movl    $__BOOT_TSS, %eax
        ltr     %ax
 
        /*