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Diffstat (limited to 'sys/i386/boot/asm.S')
| -rw-r--r-- | sys/i386/boot/asm.S | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/sys/i386/boot/asm.S b/sys/i386/boot/asm.S deleted file mode 100644 index b291428..0000000 --- a/sys/i386/boot/asm.S +++ /dev/null @@ -1,260 +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 - * $Id$ - */ - - -/* - 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. -*/ - - .file "asm.s" - -#include "asm.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 - - # load the gdtr - addr32 - data32 - lgdt EXT(Gdtr) - - # 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 $0x18, $xprot - -xprot: - # we are in USE32 mode now - # set up the protected mode segment registers : DS, SS, ES - mov $0x20, %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 $0x28, $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 - -/* -# -# startprog(phyaddr) -# start the program on protected mode where phyaddr is the entry point -# -*/ - -ENTRY(startprog) - push %ebp - mov %esp, %ebp - - # get things we need into registers - movl 0x8(%ebp), %ecx # entry offset - movl 0x0c(%ebp), %eax # &argv - - # make a new stack at 0:0xa0000 (big segs) - mov $0x10, %ebx - movw %bx, %ss - movl $0xa0000, %ebx - movl %ebx, %esp - - # push some number of args onto the stack - pushl $0 # nominally a cyl offset in the boot. - pushl 0x8(%eax) # argv[2] = bootdev - pushl 0x4(%eax) # argv[1] = howto - pushl $0 # dummy 'return' address - - # push on our entry address - mov $0x08, %ebx # segment - pushl %ebx - pushl %ecx - - # convert over the other data segs - mov $0x10, %ebx - movw %bx, %ds - movw %bx, %es - - # convert the PC (and code seg) - lret -/* -# -# pbzero( dst, cnt) -# where src is a virtual address and dst is a physical address -*/ - -ENTRY(pbzero) - push %ebp - mov %esp, %ebp - push %es - push %esi - push %edi - push %ecx - - cld - - # set %es to point at the flat segment - mov $0x10, %eax - movw %ax, %es - - mov 0x8(%ebp), %edi # destination - mov 0xc(%ebp), %ecx # count - mov $0x0, %eax # value - - rep - stosb - - pop %ecx - pop %edi - pop %esi - pop %es - pop %ebp - - ret -/* -# -# pcpy(src, dst, cnt) -# where src is a virtual address and dst is a physical address -# -*/ - -ENTRY(pcpy) - push %ebp - mov %esp, %ebp - push %es - push %esi - push %edi - push %ecx - - cld - - # set %es to point at the flat segment - mov $0x10, %eax - movw %ax, %es - - mov 0x8(%ebp), %esi # source - mov 0xc(%ebp), %edi # destination - mov 0x10(%ebp), %ecx # count - - rep - movsb - - pop %ecx - pop %edi - pop %esi - pop %es - pop %ebp - - ret - |
