Merge branch 'linus' into tracing/hw-breakpoints

Conflicts:
	arch/x86/Kconfig
	arch/x86/kernel/traps.c
	arch/x86/power/cpu.c
	arch/x86/power/cpu_32.c
	kernel/Makefile

Semantic conflict:
	arch/x86/kernel/hw_breakpoint.c

Merge reason: Resolve the conflicts, move from put_cpu_no_sched() to
              put_cpu() in arch/x86/kernel/hw_breakpoint.c.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 82 insertions, 0 deletions

diff --git a/arch/x86/boot/bioscall.S b/arch/x86/boot/bioscall.S
new file mode 100644
index 000000000000..507793739ea5
--- /dev/null
+++ b/arch/x86/boot/bioscall.S
@@ -0,0 +1,82 @@
+/* -----------------------------------------------------------------------
+ *
+ *   Copyright 2009 Intel Corporation; author H. Peter Anvin
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2 or (at your
+ *   option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * "Glove box" for BIOS calls.  Avoids the constant problems with BIOSes
+ * touching registers they shouldn't be.
+ */
+
+        .code16
+        .text
+        .globl  intcall
+        .type   intcall, @function
+intcall:
+        /* Self-modify the INT instruction.  Ugly, but works. */
+        cmpb    %al, 3f
+        je      1f
+        movb    %al, 3f
+        jmp     1f              /* Synchronize pipeline */
+1:
+        /* Save state */
+        pushfl
+        pushw   %fs
+        pushw   %gs
+        pushal
+
+        /* Copy input state to stack frame */
+        subw    $44, %sp
+        movw    %dx, %si
+        movw    %sp, %di
+        movw    $11, %cx
+        rep; movsd
+
+        /* Pop full state from the stack */
+        popal
+        popw    %gs
+        popw    %fs
+        popw    %es
+        popw    %ds
+        popfl
+
+        /* Actual INT */
+        .byte   0xcd            /* INT opcode */
+3:      .byte   0
+
+        /* Push full state to the stack */
+        pushfl
+        pushw   %ds
+        pushw   %es
+        pushw   %fs
+        pushw   %gs
+        pushal
+
+        /* Re-establish C environment invariants */
+        cld
+        movzwl  %sp, %esp
+        movw    %cs, %ax
+        movw    %ax, %ds
+        movw    %ax, %es
+
+        /* Copy output state from stack frame */
+        movw    68(%esp), %di   /* Original %cx == 3rd argument */
+        andw    %di, %di
+        jz      4f
+        movw    %sp, %si
+        movw    $11, %cx
+        rep; movsd
+4:      addw    $44, %sp
+
+        /* Restore state and return */
+        popal
+        popw    %gs
+        popw    %fs
+        popfl
+        retl
+        .size   intcall, .-intcall