diff options
Diffstat (limited to 'sys/boot/pc98/boot2/boot2.S')
| -rw-r--r-- | sys/boot/pc98/boot2/boot2.S | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/sys/boot/pc98/boot2/boot2.S b/sys/boot/pc98/boot2/boot2.S deleted file mode 100644 index be85030..0000000 --- a/sys/boot/pc98/boot2/boot2.S +++ /dev/null @@ -1,182 +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 11:35:26 rpd - * boot2.S,v 1.6 1995/01/25 21:37:40 bde Exp - * $FreeBSD$ - */ -/* - * Ported to PC-9801 by Yoshio Kimura - */ - -#include "asm.h" - -/* Conventional GDT indexes. */ -#define BOOT_CS_INDEX 3 -#define BOOT_CS16_INDEX 5 -#define BOOT_DS_INDEX 4 - -#ifdef BDE_DEBUGGER -#define DB_CS_INDEX 14 -#define DB_CS16_INDEX 15 -#define DB_DS_INDEX 16 -#define GDT_INDEX 17 -#endif - -/* Vector numbers. */ -#define BREAKPOINT_VECTOR 3 -#define DEBUG_VECTOR 1 - -/* - * boot2() -- second stage boot - * SP points to default string if found - */ - .code16 -ENTRY(boot2) - subl %eax, %eax - mov %cs, %ax - mov %ax, %ds - mov %ax, %es - shll $4, %eax - - /* fix up GDT entries for bootstrap */ -#define FIXUP(gdt_index) \ - .code32; \ - addr32; \ - movl %eax, EXT(Gdt)+(8*gdt_index)+2; /* actually movw %ax */ \ - addr32; \ - movb %bl, EXT(Gdt)+(8*gdt_index)+4; \ - .code16 - - shld $16, %eax, %ebx - FIXUP(BOOT_CS_INDEX) - FIXUP(BOOT_CS16_INDEX) - FIXUP(BOOT_DS_INDEX) - - /* fix up GDT pointer */ - movl %eax, %ecx - addl $ EXT(Gdt), %eax - .code32 - addr32 - data32 - movl %eax, EXT(Gdtr)+2 - .code16 - -#ifdef BDE_DEBUGGER - /* fix up GDT entry for GDT */ - data32 - shld $16, %eax, %ebx - FIXUP(GDT_INDEX) - - /* fix up IDT pointer */ - data32 - addl $ EXT(Idt), %ecx - addr32 - data32 - movl %ecx, EXT(Idtr_prot)+2 - - /* %es = vector table segment for a while */ - push %es - data32 - subl %eax, %eax - mov %ax, %es - - /* fix up GDT entries for bdb */ - data32 - movl $4*DEBUG_VECTOR, %esi - addr32 - movl %es: 2(%esi), %eax /* actually movw to %ax */ - data32 - shll $4, %eax - data32 - shld $16, %eax, %ebx - FIXUP(DB_CS_INDEX) - FIXUP(DB_CS16_INDEX) - FIXUP(DB_DS_INDEX) - - /* Fetch entry points of bdb's protected mode trap handlers. These - * are stored at 2 before the corresponding entry points for real mode. - */ - data32 - subl %ebx, %ebx - addr32 - movl %es: (%esi), %ebx /* actually movw to %bx */ - data32 - subl %ecx, %ecx - addr32 - movl %es: 4*(BREAKPOINT_VECTOR-DEBUG_VECTOR)(%esi), %ecx - /* actually movw to %cx */ - - /* %es = bdb segment for a while */ - data32 - shrl $4, %eax - mov %ax, %es - - /* fix up IDT entries for bdb */ - data32 - subl $2, %ebx /* calculate EA to check it */ - jb 1f /* give up if it would trap */ - addr32 - movl %es: (%ebx), %eax /* actually movw to %ax */ - addr32 - movl %eax, EXT(Idt)+8*DEBUG_VECTOR /* actually movw %ax */ -1: - data32 - subl $2, %ecx - jb 1f - addr32 - movl %es: (%ecx), %eax /* actually movw to %ax */ - addr32 - movl %eax, EXT(Idt)+8*BREAKPOINT_VECTOR /* actually movw %ax */ -1: - - /* finished with groping in real mode segments */ - pop %es -#endif /* BDE_DEBUGGER */ - - /* change to protected mode */ - .code32 - data32 - call EXT(real_to_prot) - - /* clear the bss */ - movl $ EXT(edata), %edi /* no EXT(_edata) - krufty ld */ - movl $ EXT(end), %ecx /* or EXT(_end) */ - subl %edi, %ecx - subb %al, %al - rep - stosb - -#ifdef NAMEBLOCK - movl %esp, EXT(dflt_name) -#endif - - movb 0xA1584 - BOOTSEG * 0x10, %dl - movzbl %dl, %edx /* discard head (%dh) and random high bits */ - pushl %edx - call EXT(boot) -oops: - hlt - jmp oops |
