diff options
Diffstat (limited to 'sys/arch/i386/apm_init/real_prot.S')
| -rw-r--r-- | sys/arch/i386/apm_init/real_prot.S | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/sys/arch/i386/apm_init/real_prot.S b/sys/arch/i386/apm_init/real_prot.S deleted file mode 100644 index 5f9e97ecf68..00000000000 --- a/sys/arch/i386/apm_init/real_prot.S +++ /dev/null @@ -1,186 +0,0 @@ -/* - * Mach Operating System - * Copyright (c) 1992, 1991 Carnegie Mellon University - * All Rights Reserved. - * - * Permission to use, copy, modify and distribute this software and its - * documentation is hereby granted, provided that both the copyright - * notice and this permission notice appear in all copies of the - * software, derivative works or modified versions, and any portions - * thereof, and that both notices appear in supporting documentation. - * - * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" - * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR - * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * Carnegie Mellon requests users of this software to return to - * - * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU - * School of Computer Science - * Carnegie Mellon University - * Pittsburgh PA 15213-3890 - * - * any improvements or extensions that they make and grant Carnegie Mellon - * the rights to redistribute these changes. - * - * from: Mach, Revision 2.2 92/04/04 11:34:13 rpd - * $Id: real_prot.S,v 1.1 1996/04/29 14:15:43 hvozda Exp $ - */ - - -/* - Copyright 1988, 1989, 1990, 1991, 1992 - by Intel Corporation, Santa Clara, California. - - All Rights Reserved - -Permission to use, copy, modify, and distribute this software and -its documentation for any purpose and without fee is hereby -granted, provided that the above copyright notice appears in all -copies and that both the copyright notice and this permission notice -appear in supporting documentation, and that the name of Intel -not be used in advertising or publicity pertaining to distribution -of the software without specific, written prior permission. - -INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE -INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, -IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR -CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM -LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, -NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION -WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -*/ - -/* - * LP (Laptop Package) - * - * Copyright (C) 1994 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp> - * - * This software may be used, modified, copied, and distributed, in - * both source and binary form provided that the above copyright and - * these terms are retained. Under no circumstances is the author - * responsible for the proper functioning of this software, nor does - * the author assume any responsibility for damages incurred with its - * use. - * - * Sep., 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD) - * Oct., 1994 NetBSD port (1.0 BETA 10/2) by ukai - */ - -/* - * Modified for APM BIOS initializer by HOSOKAWA Tatsumi - * - * See also locore.s. It supports these functions works correctly. - */ - - .file "real_prot.S" - -#include "real_prot.h" -#include "apm_segments.h" - -CR0_PE_ON = 0x1 -CR0_PE_OFF = 0xfffffffe - -.globl _ouraddr - .text - -/* - * - * real_to_prot() - * transfer from real mode to protected mode. - */ - -ENTRY(real_to_prot) - /* guarantee that interrupt is disabled when in prot mode */ - cli - - /* - * deleted for APM initializer by HOSOKAWA Tatsumi - * <hosoakwa@mt.cs.keio.ac.jp> - */ -#if 0 - /* load the gdtr */ - addr32 - data32 - lgdt EXT(Gdtr) -#endif - - /* set the PE bit of CR0 */ - mov %cr0, %eax - - data32 - or $CR0_PE_ON, %eax - mov %eax, %cr0 - - /* - * make intrasegment jump to flush the processor pipeline and - * reload CS register - */ - data32 - ljmp $(APM_INIT_CS_SEL), $xprot - -xprot: - /* - * we are in USE32 mode now - * set up the protected mode segment registers : DS, SS, ES - */ - mov $(APM_INIT_DS_SEL), %eax - movw %ax, %ds - movw %ax, %ss - movw %ax, %es - - /* load idtr so we can debug */ - lidt EXT(Idtr_prot) - - ret - -/* - * - * prot_to_real() - * transfer from protected mode to real mode - * - */ - -ENTRY(prot_to_real) - - /* set up a dummy stack frame for the second seg change. */ - movl _ouraddr, %eax - sarl $4, %eax - pushw %ax - movw $xreal, %ax /* gas botches pushw $xreal - extra bytes 0, 0*/ - pushw %ax /* decode to add %al, (%eax) (%al usually 0) */ - - /* Change to use16 mode. */ - ljmp $(APM_INIT_CS16_SEL), $x16 - -x16: - /* clear the PE bit of CR0 */ - mov %cr0, %eax - data32 - and $CR0_PE_OFF, %eax - mov %eax, %cr0 - - /* - * make intersegment jmp to flush the processor pipeline - * using the fake stack frame set up earlier - * and reload CS register - */ - lret - -xreal: - /* - * we are in real mode now - * set up the real mode segment registers : DS, SS, ES - */ - movw %cs, %ax - movw %ax, %ds - movw %ax, %ss - movw %ax, %es - - /* load idtr so we can debug */ - addr32 - data32 - lidt EXT(Idtr_real) - - data32 - ret |