b5d89ca8ad
(Boot with the -D flag if you want symbols.) Make it easier to extend `struct bootinfo' without losing either forwards or backwards compatibility. ddb_aout.c: Get the symbol table from wherever the loader put it. Nuke db_symtab[SYMTAB_SPACE]. boot.c: Enable loading of symbols. Align them on a page boundary. Add printfs about the symbol table sizes. Pass the memory sizes to the kernel. Fix initialization of `unit' (it got moved out of the loop). Fix adding the bss size (it got moved inside an ifdef). Initialize serial port when RB_SERIAL is toggled on. Fix comments. Clean up formatting of recently added code. io.c: Clean up formatting of recently added code. netboot/main.c, machdep.c, wd.c: Change names of bootinfo fields. LINT: Nuke SYMTAB_SPACE. Fix comment about DODUMP. Makefile.i386: Nuke use of dbsym. Exclude gcc symbols from kernel unless compiling with -g. Remove unused macro. Fix comments and formatting. genassym.c: Generate defines for some new bootinfo fields. Change names of old ones. locore.s: Copy only the valid part of the `struct bootinfo' passed by the loader. Reserve space for symbol table, if any. machdep.c: Check the memory sizes passed by the loader, if any. Don't use them yet. bootinfo.h: Add a size field so that we can resolve some mismatches between the loader bootinfo and the kernel boot info. The version number is not so good for this because of historical botches and because it's harder to maintain. Add memory size and symbol table fields. Change the names of everything. Hacks to save a few bytes: asm.S, boot.c, boot2.S: Replace `ouraddr' by `(BOOTSEG << 4)'. boot.c: Don't statically initialize `loadflags' to 0. Disable the "REDUNDANT" code that skips the BIOS variables. Eliminate `total'. Combine some more printfs. boot.h, disk.c, io.c, table.c: Move all statically initialzed data to table.c. io.c: Don't put the A20 gate bits in a variable.
173 lines
3.8 KiB
ArmAsm
173 lines
3.8 KiB
ArmAsm
/*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* from: Mach, Revision 2.2 92/04/04 11:35:26 rpd
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* $Id: boot2.S,v 1.5 1994/08/30 01:38:03 bde Exp $
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*/
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#include "asm.h"
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/* Conventional GDT indexes. */
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#define BOOT_CS_INDEX 3
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#define BOOT_CS16_INDEX 5
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#define BOOT_DS_INDEX 4
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#ifdef BDE_DEBUGGER
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#define DB_CS_INDEX 14
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#define DB_CS16_INDEX 15
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#define DB_DS_INDEX 16
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#define GDT_INDEX 17
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#endif
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/* Vector numbers. */
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#define BREAKPOINT_VECTOR 3
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#define DEBUG_VECTOR 1
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/*
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* boot2() -- second stage boot
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*/
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ENTRY(boot2)
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data32
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subl %eax, %eax
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mov %cs, %ax
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mov %ax, %ds
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mov %ax, %es
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data32
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shll $4, %eax
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/* fix up GDT entries for bootstrap */
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#define FIXUP(gdt_index) \
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addr32; \
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movl %eax, EXT(Gdt)+(8*gdt_index)+2; /* actually movw %ax */ \
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addr32; \
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movb %bl, EXT(Gdt)+(8*gdt_index)+4
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data32
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shld $16, %eax, %ebx
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FIXUP(BOOT_CS_INDEX)
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FIXUP(BOOT_CS16_INDEX)
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FIXUP(BOOT_DS_INDEX)
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/* fix up GDT pointer */
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data32
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movl %eax, %ecx
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data32
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addl $ EXT(Gdt), %eax
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addr32
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data32
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movl %eax, EXT(Gdtr)+2
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#ifdef BDE_DEBUGGER
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/* fix up GDT entry for GDT */
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data32
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shld $16, %eax, %ebx
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FIXUP(GDT_INDEX)
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/* fix up IDT pointer */
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data32
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addl $ EXT(Idt), %ecx
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addr32
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data32
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movl %ecx, EXT(Idtr_prot)+2
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/* %es = vector table segment for a while */
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push %es
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data32
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subl %eax, %eax
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mov %ax, %es
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/* fix up GDT entries for bdb */
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data32
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movl $4*DEBUG_VECTOR, %esi
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addr32
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movl %es: 2(%esi), %eax /* actually movw to %ax */
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data32
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shll $4, %eax
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data32
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shld $16, %eax, %ebx
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FIXUP(DB_CS_INDEX)
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FIXUP(DB_CS16_INDEX)
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FIXUP(DB_DS_INDEX)
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/* Fetch entry points of bdb's protected mode trap handlers. These
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* are stored at 2 before the corresponding entry points for real mode.
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*/
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data32
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subl %ebx, %ebx
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addr32
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movl %es: (%esi), %ebx /* actually movw to %bx */
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data32
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subl %ecx, %ecx
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addr32
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movl %es: 4*(BREAKPOINT_VECTOR-DEBUG_VECTOR)(%esi), %ecx
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/* actually movw to %cx */
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/* %es = bdb segment for a while */
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data32
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shrl $4, %eax
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mov %ax, %es
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/* fix up IDT entries for bdb */
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data32
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subl $2, %ebx /* calculate EA to check it */
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jb 1f /* give up if it would trap */
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addr32
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movl %es: (%ebx), %eax /* actually movw to %ax */
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addr32
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movl %eax, EXT(Idt)+8*DEBUG_VECTOR /* actually movw %ax */
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1:
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data32
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subl $2, %ecx
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jb 1f
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addr32
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movl %es: (%ecx), %eax /* actually movw to %ax */
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addr32
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movl %eax, EXT(Idt)+8*BREAKPOINT_VECTOR /* actually movw %ax */
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1:
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/* finished with groping in real mode segments */
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pop %es
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#endif /* BDE_DEBUGGER */
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/* change to protected mode */
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data32
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call EXT(real_to_prot)
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/* clear the bss */
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movl $ EXT(edata), %edi /* no EXT(_edata) - krufty ld */
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movl $ EXT(end), %ecx /* or EXT(_end) */
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subl %edi, %ecx
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subb %al, %al
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rep
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stosb
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movzbl %dl, %edx /* discard head (%dh) and random high bits */
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pushl %edx
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call EXT(boot)
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oops:
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hlt
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jmp oops
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