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Diffstat (limited to 'sys/i386/boot/asm.S')
| -rw-r--r-- | sys/i386/boot/asm.S | 276 |
1 files changed, 0 insertions, 276 deletions
diff --git a/sys/i386/boot/asm.S b/sys/i386/boot/asm.S deleted file mode 100644 index 90f523f..0000000 --- a/sys/i386/boot/asm.S +++ /dev/null @@ -1,276 +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: asm.S,v 1.4 1994/10/02 05:18:24 rgrimes 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. -*/ - - .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 - -#ifdef BDE_DEBUGGER - /* load idtr so we can debug */ - lidt EXT(Idtr_prot) -#endif - - 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 - -#ifdef BDE_DEBUGGER - /* load idtr so we can debug */ - addr32 - data32 - lidt EXT(Idtr_real) -#endif - - data32 - ret - -/* - * startprog(phyaddr) - * start the program on protected mode where phyaddr is the entry point - * - * XXX This whole mess should go away and we should run the boot code in - * flat 32 bit mode with it linked -T BOOTSEG. See the netboot code for - * how this is done. - */ - -ENTRY(startprog) - push %ebp - mov %esp, %ebp - movl %esp, %eax /* Use eax as the old stack pointer */ - - /* convert the current stack to a 32 bit flat model */ - mov $0x10, %ebx - movw %bx, %ss - addl $(BOOTSEG<<4),%esp - - /* copy the arguments from the old stack to the new stack */ - pushl 0x14(%eax) /* &bootinfo */ - pushl $0 /* was &nfsdiskless */ - pushl $0 /* was esym */ - pushl $0 /* was cyloffset */ - pushl 0x10(%eax) /* bootdev */ - pushl 0x0C(%eax) /* howto */ - movl $(ourreturn),%ebx - addl $(BOOTSEG<<4),%ebx /* Fix it up for flat segments */ - pushl %ebx /* our return address */ - - /* push on our entry address */ - pushl $0x08 /* segment selector */ - pushl 0x08(%eax) /* kernel entry address */ - - /* convert over the other data segs */ - mov $0x10, %ebx - movw %bx, %ds - movw %bx, %es - - /* convert the PC (and code seg) */ - lret -ourreturn: - /* For now there is not much we can do, just lock in a loop */ - jmp ourreturn - -/* - * - * 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 - |
