mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
d691005856
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 18 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520075211.321157221@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
79 lines
1.4 KiB
ArmAsm
79 lines
1.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/* -----------------------------------------------------------------------
|
|
*
|
|
* Copyright 2009-2014 Intel Corporation; author H. Peter Anvin
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* "Glove box" for BIOS calls. Avoids the constant problems with BIOSes
|
|
* touching registers they shouldn't be.
|
|
*/
|
|
|
|
.code16
|
|
.section ".inittext","ax"
|
|
.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
|