diff options
Diffstat (limited to 'arch/x86/boot/bioscall.S')
| -rw-r--r-- | arch/x86/boot/bioscall.S | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/arch/x86/boot/bioscall.S b/arch/x86/boot/bioscall.S deleted file mode 100644 index 6cda1eb40a..0000000000 --- a/arch/x86/boot/bioscall.S +++ /dev/null @@ -1,90 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* SPDX-FileCopyrightText: 2009 Intel Corporation */ - -/* Author: H. Peter Anvin */ - -/* - * "Glove box" for BIOS calls. Avoids the constant problems with BIOSes - * touching registers they shouldn't be. - */ - - .file "bioscall.S" - .code16 - .section .boot.text.intcall, "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 - -/* ------------------------------------------------------------------------ */ - .code16 - .section .boot.text.die, "ax" - - .globl die - .type die, @function -die: - hlt - jmp die - .size die, .-die |