x86/cpu_entry_area: Move it to a separate unit

Separate the cpu_entry_area code out of cpu/common.c and the fixmap.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 1 insertions, 40 deletions

diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index 8153b8d86a3c3..fb801662a2305 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -25,6 +25,7 @@
 #else
 #include <uapi/asm/vsyscall.h>
 #endif
+#include <asm/cpu_entry_area.h>
 
 /*
  * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
@@ -45,46 +46,6 @@ extern unsigned long __FIXADDR_TOP;
 #endif
 
 /*
- * cpu_entry_area is a percpu region in the fixmap that contains things
- * needed by the CPU and early entry/exit code.  Real types aren't used
- * for all fields here to avoid circular header dependencies.
- *
- * Every field is a virtual alias of some other allocated backing store.
- * There is no direct allocation of a struct cpu_entry_area.
- */
-struct cpu_entry_area {
-	char gdt[PAGE_SIZE];
-
-	/*
-	 * The GDT is just below entry_stack and thus serves (on x86_64) as
-	 * a a read-only guard page.
-	 */
-	struct entry_stack_page entry_stack_page;
-
-	/*
-	 * On x86_64, the TSS is mapped RO.  On x86_32, it's mapped RW because
-	 * we need task switches to work, and task switches write to the TSS.
-	 */
-	struct tss_struct tss;
-
-	char entry_trampoline[PAGE_SIZE];
-
-#ifdef CONFIG_X86_64
-	/*
-	 * Exception stacks used for IST entries.
-	 *
-	 * In the future, this should have a separate slot for each stack
-	 * with guard pages between them.
-	 */
-	char exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ];
-#endif
-};
-
-#define CPU_ENTRY_AREA_PAGES (sizeof(struct cpu_entry_area) / PAGE_SIZE)
-
-extern void setup_cpu_entry_areas(void);
-
-/*
  * Here we define all the compile-time 'special' virtual
  * addresses. The point is to have a constant address at
  * compile time, but to set the physical address only