freebsd-dev/sys/i386/boot/biosboot/table.c
Bruce Evans b5d89ca8ad Load the kernel symbol table in the boot loader and not at compile time.
(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.
1995-01-25 21:40:47 +00:00

140 lines
5.0 KiB
C

/*
* 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 11:36:43 rpd
* $Id: table.c,v 1.4 1994/08/30 01:38:04 bde 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.
*/
/* Segment Descriptor
*
* 31 24 19 16 7 0
* ------------------------------------------------------------
* | | |B| |A| | | |1|0|E|W|A| |
* | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 |
* | | |D| |L| 19..16| | |1|1|C|R|A| |
* ------------------------------------------------------------
* | | |
* | BASE 15..0 | LIMIT 15..0 |
* | | |
* ------------------------------------------------------------
*/
struct seg_desc {
unsigned short limit_15_0;
unsigned short base_15_0;
unsigned char base_23_16;
unsigned char p_dpl_type;
unsigned char g_b_a_limit;
unsigned char base_31_24;
};
#define RUN 0 /* not really 0, but filled in at boot time */
struct seg_desc Gdt[] = {
{0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* 0x0 : null */
{0xFFFF, 0x0, 0x0, 0x9F, 0xCF, 0x0}, /* 0x08 : kernel code */
/* 0x9E? */
{0xFFFF, 0x0, 0x0, 0x93, 0xCF, 0x0}, /* 0x10 : kernel data */
/* 0x92? */
{0xFFFF, RUN, RUN, 0x9E, 0x40, 0x0}, /* 0x18 : boot code */
{0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* 0x20 : boot data */
{0xFFFF, RUN, RUN, 0x9E, 0x0, 0x0}, /* 0x28 : boot code, 16 bits */
#ifdef BDE_DEBUGGER
/* More for bdb. */
{}, /* BIOS_CS_INDEX = 6 : null */
{}, /* BIOS_TMP_INDEX = 7 : null */
{}, /* TSS_INDEX = 8 : null */
{0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* DS_286_INDEX = 9 */
{0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* ES_286_INDEX = 10 */
{}, /* Unused = 11 : null */
{0x7FFF, 0x8000, 0xB, 0xB2, 0x40, 0x0}, /* COLOR_INDEX = 12 */
{0x7FFF, 0x0, 0xB, 0xB2, 0x40, 0x0}, /* MONO_INDEX = 13 */
{0xFFFF, RUN, RUN, 0x9A, 0x40, 0x0}, /* DB_CS_INDEX = 14 */
{0xFFFF, RUN, RUN, 0x9A, 0x0, 0x0}, /* DB_CS16_INDEX = 15 */
{0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* DB_DS_INDEX = 16 */
{8*18-1, RUN, RUN, 0x92, 0x40, 0x0}, /* GDT_INDEX = 17 */
#endif /* BDE_DEBUGGER */
};
#ifdef BDE_DEBUGGER
struct idt_desc {
unsigned short entry_15_0;
unsigned short selector;
unsigned char padding;
unsigned char p_dpl_type;
unsigned short entry_31_16;
};
struct idt_desc Idt[] = {
{}, /* Null (int 0) */
{RUN, 0x70, 0, 0x8E, 0}, /* DEBUG_VECTOR = 1 */
{}, /* Null (int 2) */
{RUN, 0x70, 0, 0xEE, 0}, /* BREAKPOINT_VECTOR = 3 */
};
#endif /* BDE_DEBUGGER */
struct pseudo_desc {
unsigned short limit;
unsigned short base_low;
unsigned short base_high;
};
struct pseudo_desc Gdtr = { sizeof Gdt - 1, RUN, RUN };
#ifdef BDE_DEBUGGER
struct pseudo_desc Idtr_prot = { sizeof Idt - 1, RUN, RUN };
struct pseudo_desc Idtr_real = { 0x400 - 1, 0x0, 0x0 };
#endif
/*
* All initialized data is defined in one file to reduce space wastage from
* fragmentation.
*/
char *devs[] = { "wd", "hd", "fd", "wt", "sd", 0 };
char *name = "/kernel";
unsigned long tw_chars = 0x5C2D2F7C; /* "\-/|" */