diff options
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/fixmap.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h index b61f0242f9d0..84558b611ad3 100644 --- a/arch/x86/include/asm/fixmap.h +++ b/arch/x86/include/asm/fixmap.h @@ -54,6 +54,13 @@ extern unsigned long __FIXADDR_TOP; */ struct cpu_entry_area { char gdt[PAGE_SIZE]; + + /* + * The GDT is just below cpu_tss and thus serves (on x86_64) as a + * a read-only guard page for the SYSENTER stack at the bottom + * of the TSS region. + */ + struct tss_struct tss; }; #define CPU_ENTRY_AREA_PAGES (sizeof(struct cpu_entry_area) / PAGE_SIZE) |
