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The files in this directory are modified version of "biosboot".  The
only difference is in that they perform their I/O via a serial port,
so their preferrable usage is to form bootblocks for systems where the
kernel happens to have an "options COMCONSOLE".  Most of the code is
actually shared with "biosboot", and make will not (and should not)
descend into this directory by default.  It is in the responsibility
of the user to build these bootblocks instead of the original ones.
This commit is contained in:
Joerg Wunsch 1994-12-18 20:12:10 +00:00
parent 0246a9d813
commit 2c681fc102
3 changed files with 709 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
sys/i386/boot/serialboot/Makefile Normal file
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# $Id: Makefile,v 1.22 1994/11/05 21:06:16 ache Exp $
#
PROG= boot
.PATH: ${.CURDIR}/../biosboot
# Order is very important on the SRCS line for this prog
SRCS= start.S table.c boot2.S boot.c asm.S bios.S io.c disk.c sys.c
BINDIR= /usr/mdec
BINMODE= 444
CFLAGS= -O -DDO_BAD144 -DBOOTWAIT=${BOOTWAIT} -DCOMCONSOLE=0x3F8
CFLAGS+= -DBOOTSEG=${BOOTSEG} -DBOOTSTACK=${BOOTSTACK}
CFLAGS+= -I${.CURDIR} -I${.CURDIR}/../biosboot -I${.CURDIR}/../..
CLEANFILES+= boot.nohdr boot.strip boot1 boot2
DPADD= ${LIBC}
LDFLAGS+= -N -T 0 -nostdlib
LDADD= -lc
LINKS= ${BINDIR}/sdboot ${BINDIR}/wdboot\
${BINDIR}/sdboot ${BINDIR}/fdboot\
${BINDIR}/bootsd ${BINDIR}/bootwd\
${BINDIR}/bootsd ${BINDIR}/bootfd
NOSHARED= YES
NOMAN=
STRIP=
# tunable timeout parameter, waiting for keypress, calibrated in mS
BOOTWAIT?= 5000
# Location that boot2 is loaded at
BOOTSEG= 0x1000
# Offset in BOOTSEG for the top of the stack, keep this 16 byte aligned
BOOTSTACK= 0xFFF0
boot.strip: boot
cp -p boot boot.strip
strip boot.strip
size boot.strip
boot.nohdr: boot.strip
dd if=boot.strip of=boot.nohdr ibs=32 skip=1 obs=1024b
ls -l boot.nohdr
boot1: boot.nohdr
dd if=boot.nohdr of=boot1 bs=512 count=1
boot2: boot.nohdr
dd if=boot.nohdr of=boot2 bs=512 skip=1
all: boot1 boot2
beforeinstall:
install ${COPY} -o ${BINOWN} -g ${BINGRP} -m ${BINMODE}\
boot1 ${DESTDIR}${BINDIR}/sdboot
install ${COPY} -o ${BINOWN} -g ${BINGRP} -m ${BINMODE}\
boot2 ${DESTDIR}${BINDIR}/bootsd
.include <bsd.prog.mk>

366
sys/i386/boot/serialboot/bios.S Normal file
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/*
* 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 11:34:26 rpd
* $Id: bios.S,v 1.3 1994/10/02 05:18:25 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.
*/
/*
* Serial bootblock interface routines
* Copyright (c) 1994, J"org Wunsch
*
* 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.
*
* THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*/
.file "bios.s"
#include "asm.h"
.text
/*
* biosread(dev, cyl, head, sec, nsec, offset)
* Read "nsec" sectors from disk to offset "offset" in boot segment
* BIOS call "INT 0x13 Function 0x2" to read sectors from disk into memory
* Call with %ah = 0x2
* %al = number of sectors
* %ch = cylinder
* %cl = sector
* %dh = head
* %dl = drive (0x80 for hard disk, 0x0 for floppy disk)
* %es:%bx = segment:offset of buffer
* Return:
* %al = 0x0 on success; err code on failure
*/
ENTRY(biosread)
push %ebp
mov %esp, %ebp
push %ebx
push %ecx
push %edx
push %es
movb 0x10(%ebp), %dh
movw 0x0c(%ebp), %cx
/* cylinder; the highest 2 bits of cyl is in %cl */
xchgb %ch, %cl
rorb $2, %cl
movb 0x14(%ebp), %al
orb %al, %cl
incb %cl /* sector; sec starts from 1, not 0 */
movb 0x8(%ebp), %dl /* device */
movl 0x1c(%ebp), %ebx /* offset */
/* prot_to_real will set %es to BOOTSEG */
call EXT(prot_to_real) /* enter real mode */
movb $0x2, %ah /* subfunction */
addr32
movb 0x18(%ebp), %al /* number of sectors */
sti
int $0x13
cli
/* save return value (actually movw %ax, %bx) */
mov %eax, %ebx
data32
call EXT(real_to_prot) /* back to protected mode */
xor %eax, %eax
movb %bh, %al /* return value in %ax */
pop %es
pop %edx
pop %ecx
pop %ebx
pop %ebp
ret
/*
* The serial port interface routines implement a simple polled i/o
* interface to a standard serial port. Due to the space restrictions
* for the boot blocks, no BIOS support is used (since BIOS requires
* expensive real/protected mode switches), instead the rudimentary
* BIOS support is duplicated here.
*
* The base address for the i/o port is passed from the Makefile in
* the COMCONSOLE preprocessor macro. Console parameters are currently
* hard-coded to 9600 Bd, 8 bit. This can be changed in the
* init_serial() function.
*/
/*
* void putc(char ch)
* send ch to serial port
*
*/
ENTRY(putc)
push %ebp
mov %esp, %ebp
push %edx
mov $COMCONSOLE + 5, %edx # line status reg
1: inb %dx, %al
test $0x20, %al
jz 1b # TX buffer not empty
movb 0x8(%ebp), %al
sub $5, %edx # TX output reg
outb %al, %dx # send this one
pop %edx
pop %ebp
ret
/*
* int getc(void)
* read a character from serial port
*/
ENTRY(getc)
push %ebp
mov %esp, %ebp
push %edx
mov $COMCONSOLE + 5, %edx # line status reg
1:
inb %dx, %al
testb $0x01, %al
jz 1b # no RX char available
xor %eax, %eax
sub $5, %edx # RX buffer reg
inb %dx, %al # fetch (first) character
cmp $0x7F, %eax # make DEL...
jne 2f
mov $0x08, %eax # look like BS
2:
pop %edx
pop %ebp
ret
/*
* int ischar(void)
* if there is a character pending, return true; otherwise return 0
*/
ENTRY(ischar)
push %ebp
mov %esp, %ebp
push %edx
xorl %eax, %eax
mov $COMCONSOLE + 5, %edx # line status reg
inb %dx, %al
andb $0x01, %al # RX char available?
pop %edx
pop %ebp
ret
/*
* void init_serial(void)
* initialize the serial console port to 9600 Bd, 8 bpc
*/
ENTRY(init_serial)
push %ebp
mov %esp, %ebp
push %edx
mov $COMCONSOLE + 3, %edx # line control reg
movb $0x80, %al
outb %al, %dx # enable DLAB
sub $3, %edx # divisor latch, low byte
mov $12, %ax # divisor 12: 9600 Bd
outb %al, %dx
inc %edx # divisor latch, high byte
movb %ah, %al
outb %al, %dx
add $2, %edx # line control reg
movb $0x13, %al
outb %al, %dx # 8 bit, no parity, 1 stop bit
inc %edx # modem control reg
mov $3, %al
outb %al, %dx # enable DTR/RTS
/* now finally, flush the input buffer */
inc %edx # line status reg
1:
inb %dx, %al
testb $0x01, %al
jz 2f # no more characters buffered
sub $5, %edx # rx buffer reg
inb %dx, %al # throw away
add $5, %edx
jmp 1b
2:
pop %edx
pop %ebp
ret
/*
*
* get_diskinfo(): return a word that represents the
* max number of sectors and heads and drives for this device
*
*/
ENTRY(get_diskinfo)
push %ebp
mov %esp, %ebp
push %es
push %ebx
push %ecx
push %edx
movb 0x8(%ebp), %dl /* diskinfo(drive #) */
call EXT(prot_to_real) /* enter real mode */
movb $0x8, %ah /* ask for disk info */
sti
int $0x13
cli
jnc ok
/*
* Urk. Call failed. It is not supported for floppies by old BIOS's.
* Guess it's a 15-sector floppy. Initialize all the registers for
* documentation, although we only need head and sector counts.
*/
subb %ah, %ah /* %ax = 0 */
movb %al, %al
movb %ah, %bh /* %bh = 0 */
movb $2, %bl /* %bl bits 0-3 = drive type,
bit 2 = 1.2M */
movb $79, %ch /* max track */
movb $15, %cl /* max sector */
movb $1, %dh /* max head */
movb $1, %dl /* # floppy drives installed */
/* es:di = parameter table */
/* carry = 0 */
ok:
data32
call EXT(real_to_prot) /* back to protected mode */
xor %eax, %eax
/* form a longword representing all this gunk */
movb %dh, %ah /* max head */
andb $0x3f, %cl /* mask of cylinder gunk */
movb %cl, %al /* max sector (and # sectors) */
pop %edx
pop %ecx
pop %ebx
pop %es
pop %ebp
ret
/*
*
* memsize(i) : return the memory size in KB. i == 0 for conventional memory,
* i == 1 for extended memory
* BIOS call "INT 12H" to get conventional memory size
* BIOS call "INT 15H, AH=88H" to get extended memory size
* Both have the return value in AX.
*
*/
ENTRY(memsize)
push %ebp
mov %esp, %ebp
push %ebx
mov 8(%ebp), %ebx
call EXT(prot_to_real) /* enter real mode */
cmpb $0x1, %bl
data32
je xext
sti
int $0x12
cli
data32
jmp xdone
xext: movb $0x88, %ah
sti
int $0x15
cli
xdone:
mov %eax, %ebx
data32
call EXT(real_to_prot)
mov %ebx, %eax
pop %ebx
pop %ebp
ret

284
sys/i386/boot/serialboot/boot.c Normal file
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/*
* 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, [92/04/03 16:51:14 rvb]
* $Id: boot.c,v 1.22 1994/11/07 11:26:26 davidg 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.
*/
#include <sys/param.h>
#include "boot.h"
#include <a.out.h>
#include <sys/reboot.h>
#include <machine/bootinfo.h>
struct exec head;
struct bootinfo_t bootinfo;
char *name;
char *names[] = {
"/kernel"
};
#define NUMNAMES (sizeof(names)/sizeof(char *))
extern void init_serial(void);
extern int end;
boot(drive)
int drive;
{
int loadflags, currname = 0, ret;
char *t;
init_serial();
printf("\n>> FreeBSD BOOT @ 0x%x: %d/%d k of memory\n",
ouraddr,
memsize(0),
memsize(1));
printf("Use hd(1,a)/kernel to boot sd0 when wd0 is also installed.\n");
printf("Usage: [[[%s(0,a)]%s][-s][-r][-a][-c][-d][-b]]\nUse ? for file list.\n\n"
, devs[(drive & 0x80) ? 0 : 2]
, names[0]);
gateA20();
loadstart:
/***************************************************************\
* As a default set it to the first partition of the first *
* floppy or hard drive *
\***************************************************************/
part = unit = 0;
maj = (drive&0x80 ? 0 : 2); /* a good first bet */
name = names[currname++];
loadflags = 0;
if (currname == NUMNAMES)
currname = 0;
printf("Boot: ");
getbootdev(&loadflags);
ret = openrd();
if (ret != 0) {
if (ret > 0)
printf("Can't find %s\n", name);
goto loadstart;
}
/* if (inode.i_mode&IEXEC)
loadflags |= RB_KDB;
*/
loadprog(loadflags);
goto loadstart;
}
loadprog(howto)
int howto;
{
long int startaddr;
long int addr; /* physical address.. not directly useable */
long int bootdev;
long int total;
int i;
unsigned char tmpbuf[4096]; /* we need to load the first 4k here */
read(&head, sizeof(head));
if ( N_BADMAG(head)) {
printf("Invalid format!\n");
return;
}
poff = N_TXTOFF(head);
/*if(poff==0)
poff = 32;*/
startaddr = (int)head.a_entry & 0x00FFFFFF; /* some MEG boundary */
addr = startaddr;
printf("Booting %s(%d,%c)%s @ 0x%x\n"
, devs[maj]
, unit
, 'a'+part
, name
, addr);
if(addr < ouraddr)
{
if((addr + head.a_text + head.a_data) > ouraddr)
{
printf("kernel overlaps loader\n");
return;
}
if((addr + head.a_text + head.a_data + head.a_bss) > 0xa0000)
{
printf("bss exceeds 640k limit\n");
return;
}
}
printf("text=0x%x ", head.a_text);
/********************************************************/
/* LOAD THE TEXT SEGMENT */
/* don't clobber the first 4k yet (BIOS NEEDS IT) */
/********************************************************/
read(tmpbuf,4096);
addr += 4096;
xread(addr, head.a_text - 4096);
addr += head.a_text - 4096;
/********************************************************/
/* Load the Initialised data after the text */
/********************************************************/
while (addr & CLOFSET)
*(char *)addr++ = 0;
printf("data=0x%x ", head.a_data);
xread(addr, head.a_data);
addr += head.a_data;
/********************************************************/
/* Skip over the uninitialised data */
/* (but clear it) */
/********************************************************/
printf("bss=0x%x ", head.a_bss);
if( (addr < ouraddr) && ((addr + head.a_bss) > ouraddr))
{
pbzero(addr,ouraddr - (int)addr);
}
else
{
pbzero(addr,head.a_bss);
}
addr += head.a_bss;
#ifdef LOADSYMS /* not yet, haven't worked this out yet */
if (addr > 0x100000)
{
/********************************************************/
/*copy in the symbol header */
/********************************************************/
pcpy(&head.a_syms, addr, sizeof(head.a_syms));
addr += sizeof(head.a_syms);
/********************************************************/
/* READ in the symbol table */
/********************************************************/
printf("symbols=[+0x%x", head.a_syms);
xread(addr, head.a_syms);
addr += head.a_syms;
/********************************************************/
/* Followed by the next integer (another header) */
/* more debug symbols? */
/********************************************************/
read(&i, sizeof(int));
pcpy(&i, addr, sizeof(int));
i -= sizeof(int);
addr += sizeof(int);
/********************************************************/
/* and that many bytes of (debug symbols?) */
/********************************************************/
printf("+0x%x] ", i);
xread(addr, i);
addr += i;
}
#endif LOADSYMS
/********************************************************/
/* and note the end address of all this */
/********************************************************/
total = ((addr+sizeof(int)-1))&~(sizeof(int)-1);
printf("total=0x%x ", total);
bootdev = (MAKEBOOTDEV(maj, 0, 0, unit, part)) ;
/****************************************************************/
/* copy that first page and overwrite any BIOS variables */
/****************************************************************/
printf("entry point=0x%x\n" ,(int)startaddr);
/* Under no circumstances overwrite precious BIOS variables! */
pcpy(tmpbuf, startaddr, 0x400);
pcpy(tmpbuf + 0x500, startaddr + 0x500, 4096 - 0x500);
bootinfo.version=1;
bootinfo.kernelname=(char *)((int)name + (BOOTSEG<<4));
bootinfo.nfs_diskless=0;
startprog((int)startaddr, howto, bootdev, (int)&bootinfo+(BOOTSEG<<4));
return;
}
#define NAMEBUF_LEN 100
char namebuf[NAMEBUF_LEN];
getbootdev(howto)
int *howto;
{
char c, *ptr = namebuf;
if (gets(namebuf)) {
while (c=*ptr) {
while (c==' ')
c = *++ptr;
if (!c)
return;
if (c=='-')
while ((c = *++ptr) && c!=' ')
switch (c) {
case 'r':
*howto |= RB_DFLTROOT; continue;
case 'a':
*howto |= RB_ASKNAME; continue;
case 'c':
*howto |= RB_CONFIG; continue;
case 's':
*howto |= RB_SINGLE; continue;
case 'd':
*howto |= RB_KDB; continue;
case 'b':
*howto |= RB_HALT; continue;
}
else {
name = ptr;
while ((c = *++ptr) && c!=' ');
if (c)
*ptr++ = 0;
}
}
} else
printf("\n");
}