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ed025d6983
freebsd-dev/sys/boot/i386/boot2/boot2.c
Poul-Henning Kamp ed025d6983 Correctly calculate dmadat: We need to take the address of _end, it's 
contents is irrelevant and likely to be zero;

This doesn't change the resultant value, but it does save a couple of bytes
because &_end is constant.
2002-10-08 10:15:42 +00:00

672 lines
14 KiB
C
Raw Blame History

/*
* Copyright (c) 1998 Robert Nordier
* All rights reserved.
*
* Redistribution and use in source and binary forms are freely
* permitted provided that the above copyright notice and this
* paragraph and the following disclaimer are duplicated in all
* such forms.
*
* This software is provided "AS IS" and without any express or
* implied warranties, including, without limitation, the implied
* warranties of merchantability and fitness for a particular
* purpose.
*/
/*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/reboot.h>
#include <sys/diskslice.h>
#include <sys/disklabel.h>
#include <sys/diskmbr.h>
#include <sys/dirent.h>
#include <machine/bootinfo.h>
#include <machine/elf.h>
#include <stdarg.h>
#include <a.out.h>
#include <btxv86.h>
#include "boot2.h"
#include "lib.h"
#define IO_KEYBOARD 1
#define IO_SERIAL 2
#define SECOND 18 /* Circa that many ticks in a second. */
#define RBX_ASKNAME 0x0 /* -a */
#define RBX_SINGLE 0x1 /* -s */
#define RBX_DFLTROOT 0x5 /* -r */
#define RBX_KDB 0x6 /* -d */
#define RBX_CONFIG 0xa /* -c */
#define RBX_VERBOSE 0xb /* -v */
#define RBX_SERIAL 0xc /* -h */
#define RBX_CDROM 0xd /* -C */
#define RBX_GDB 0xf /* -g */
#define RBX_MUTE 0x10 /* -m */
#define RBX_PAUSE 0x12 /* -p */
#define RBX_DUAL 0x1d /* -D */
#define RBX_PROBEKBD 0x1e /* -P */
#define RBX_NOINTR 0x1f /* -n */
#define RBX_MASK 0x2005ffff
#define PATH_CONFIG "/boot.config"
#define PATH_BOOT3 "/boot/loader"
#define PATH_KERNEL "/kernel"
#define ARGS 0x900
#define NOPT 14
#define NDEV 5
#define MEM_BASE 0x12
#define MEM_EXT 0x15
#define V86_CY(x) ((x) & 1)
#define V86_ZR(x) ((x) & 0x40)
#define DRV_HARD 0x80
#define DRV_MASK 0x7f
#define TYPE_AD 0
#define TYPE_WD 1
#define TYPE_DA 2
#define TYPE_MAXHARD TYPE_DA
#define TYPE_WFD 3
#define TYPE_FD 4
extern uint32_t _end;
static const char optstr[NOPT] = "DhaCcdgmnPprsv";
static const unsigned char flags[NOPT] = {
RBX_DUAL,
RBX_SERIAL,
RBX_ASKNAME,
RBX_CDROM,
RBX_CONFIG,
RBX_KDB,
RBX_GDB,
RBX_MUTE,
RBX_NOINTR,
RBX_PROBEKBD,
RBX_PAUSE,
RBX_DFLTROOT,
RBX_SINGLE,
RBX_VERBOSE
};
static const char *const dev_nm[NDEV] = {"ad", "wd", "da", " ", "fd"};
static const unsigned char dev_maj[NDEV] = {30, 0, 4, 1, 2};
static struct dsk {
unsigned drive;
unsigned type;
unsigned unit;
unsigned slice;
unsigned part;
unsigned start;
int init;
} dsk;
static char cmd[512];
static char kname[1024];
static uint32_t opts = RB_BOOTINFO;
static struct bootinfo bootinfo;
static uint8_t ioctrl = IO_KEYBOARD;
void exit(int);
static void load(const char *);
static int parse(char *);
static int xfsread(ino_t, void *, size_t);
static int dskread(void *, unsigned, unsigned);
static int printf(const char *,...);
static int putchar(int);
static uint32_t memsize(int);
static int drvread(void *, unsigned, unsigned);
static int keyhit(unsigned);
static int xputc(int);
static int xgetc(int);
static int getc(int);
#if 1
#define memcpy __builtin_memcpy
#else
static void memcpy(char *, const char *, int);
static void
memcpy(char *dst, const char *src, int len)
{
while (len--)
*dst++ = *src++;
}
#endif
static inline int
strcmp(const char *s1, const char *s2)
{
for (; *s1 == *s2 && *s1; s1++, s2++);
return (u_char)*s1 - (u_char)*s2;
}
#include "ufsread.c"
static int
xfsread(ino_t inode, void *buf, size_t nbyte)
{
if (fsread(inode, buf, nbyte) != nbyte) {
printf("Invalid %s\n", "format");
return -1;
}
return 0;
}
static inline void
getstr(char *str, int size)
{
char *s;
int c;
s = str;
for (;;) {
switch (c = xgetc(0)) {
case 0:
break;
case '\177':
c = '\b';
case '\b':
if (s > str) {
s--;
putchar('\b');
putchar(' ');
} else
c = 0;
break;
case '\n':
case '\r':
*s = 0;
return;
default:
if (s - str < size - 1)
*s++ = c;
}
if (c)
putchar(c);
}
}
static inline uint32_t
drvinfo(int drive)
{
v86.addr = 0x13;
v86.eax = 0x800;
v86.edx = DRV_HARD + drive;
v86int();
if (V86_CY(v86.efl))
return 0x4f010f;
return ((v86.ecx & 0xc0) << 18) | ((v86.ecx & 0xff00) << 8) |
(v86.edx & 0xff00) | (v86.ecx & 0x3f);
}
static inline void
putc(int c)
{
v86.addr = 0x10;
v86.eax = 0xe00 | (c & 0xff);
v86.ebx = 0x7;
v86int();
}
int
main(void)
{
int autoboot, i;
ino_t ino;
dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
v86.ctl = V86_FLAGS;
dsk.drive = *(uint8_t *)PTOV(ARGS);
dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
dsk.unit = dsk.drive & DRV_MASK;
dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
bootinfo.bi_version = BOOTINFO_VERSION;
bootinfo.bi_size = sizeof(bootinfo);
bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */
bootinfo.bi_extmem = memsize(MEM_EXT);
bootinfo.bi_memsizes_valid++;
for (i = 0; i < N_BIOS_GEOM; i++)
bootinfo.bi_bios_geom[i] = drvinfo(i);
/* Process configuration file */
autoboot = 1;
if ((ino = lookup(PATH_CONFIG)))
fsread(ino, cmd, sizeof(cmd));
if (*cmd) {
printf("%s: %s", PATH_CONFIG, cmd);
if (parse(cmd))
autoboot = 0;
/* Do not process this command twice */
*cmd = 0;
}
/*
* Try to exec stage 3 boot loader. If interrupted by a keypress,
* or in case of failure, try to load a kernel directly instead.
*/
if (autoboot && !*kname) {
memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
if (!keyhit(3*SECOND)) {
load(kname);
memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
}
}
/* Present the user with the boot2 prompt. */
for (;;) {
#ifdef UFS1_ONLY
printf(" \n>> FreeBSD/i386/UFS1 BOOT\n"
#else
printf(" \n>> FreeBSD/i386/UFS[12] BOOT\n"
#endif
"Default: %u:%s(%u,%c)%s\n"
"boot: ",
dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
'a' + dsk.part, kname);
if (ioctrl & IO_SERIAL)
sio_flush();
if (!autoboot || keyhit(5*SECOND))
getstr(cmd, sizeof(cmd));
else
putchar('\n');
autoboot = 0;
if (parse(cmd))
putchar('\a');
else
load(kname);
}
}
/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
void
exit(int x)
{
}
static void
load(const char *fname)
{
union {
struct exec ex;
Elf32_Ehdr eh;
} hdr;
Elf32_Phdr ep[2];
Elf32_Shdr es[2];
caddr_t p;
ino_t ino;
uint32_t addr, x;
int fmt, i, j;
if (!(ino = lookup(fname))) {
if (!ls)
printf("No %s\n", fname);
return;
}
if (xfsread(ino, &hdr, sizeof(hdr)))
return;
if (N_GETMAGIC(hdr.ex) == ZMAGIC)
fmt = 0;
else if (IS_ELF(hdr.eh))
fmt = 1;
else {
printf("Invalid %s\n", "format");
return;
}
if (fmt == 0) {
addr = hdr.ex.a_entry & 0xffffff;
p = PTOV(addr);
fs_off = PAGE_SIZE;
if (xfsread(ino, p, hdr.ex.a_text))
return;
p += roundup2(hdr.ex.a_text, PAGE_SIZE);
if (xfsread(ino, p, hdr.ex.a_data))
return;
p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
bootinfo.bi_symtab = VTOP(p);
memcpy(p, (char *)&hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
p += sizeof(hdr.ex.a_syms);
if (hdr.ex.a_syms) {
if (xfsread(ino, p, hdr.ex.a_syms))
return;
p += hdr.ex.a_syms;
if (xfsread(ino, p, sizeof(int)))
return;
x = *(uint32_t *)p;
p += sizeof(int);
x -= sizeof(int);
if (xfsread(ino, p, x))
return;
p += x;
}
} else {
fs_off = hdr.eh.e_phoff;
for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
if (xfsread(ino, ep + j, sizeof(ep[0])))
return;
if (ep[j].p_type == PT_LOAD)
j++;
}
for (i = 0; i < 2; i++) {
p = PTOV(ep[i].p_paddr & 0xffffff);
fs_off = ep[i].p_offset;
if (xfsread(ino, p, ep[i].p_filesz))
return;
}
p += roundup2(ep[1].p_memsz, PAGE_SIZE);
bootinfo.bi_symtab = VTOP(p);
if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
(hdr.eh.e_shstrndx + 1);
if (xfsread(ino, &es, sizeof(es)))
return;
for (i = 0; i < 2; i++) {
memcpy(p, (char *)&es[i].sh_size, sizeof(es[i].sh_size));
p += sizeof(es[i].sh_size);
fs_off = es[i].sh_offset;
if (xfsread(ino, p, es[i].sh_size))
return;
p += es[i].sh_size;
}
}
addr = hdr.eh.e_entry & 0xffffff;
}
bootinfo.bi_esymtab = VTOP(p);
bootinfo.bi_kernelname = VTOP(fname);
bootinfo.bi_bios_dev = dsk.drive;
__exec((caddr_t)addr, opts & RBX_MASK,
MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
0, 0, 0, VTOP(&bootinfo));
}
static int
parse(char *arg)
{
char *p, *q;
int drv, c, i;
while ((c = *arg++)) {
if (c == ' ' || c == '\t' || c == '\n')
continue;
for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
if (*p)
*p++ = 0;
if (c == '-') {
while ((c = *arg++)) {
for (i = 0; c != optstr[i]; i++)
if (i == NOPT - 1)
return -1;
opts ^= 1 << flags[i];
}
if (opts & 1 << RBX_PROBEKBD) {
i = *(uint8_t *)PTOV(0x496) & 0x10;
/* printf("Keyboard: %s\n", i ? "yes" : "no"); */
if (!i)
opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL;
opts &= ~(1 << RBX_PROBEKBD);
}
ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) :
opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD;
if (ioctrl & IO_SERIAL)
sio_init();
} else {
for (q = arg--; *q && *q != '('; q++);
if (*q) {
drv = -1;
if (arg[1] == ':') {
if (*arg < '0' || *arg > '9')
return -1;
drv = *arg - '0';
arg += 2;
}
if (q - arg != 2)
return -1;
for (i = 0; arg[0] != dev_nm[i][0] ||
arg[1] != dev_nm[i][1]; i++)
if (i == NDEV - 1)
return -1;
dsk.type = i;
arg += 3;
if (arg[1] != ',' || *arg < '0' || *arg > '9')
return -1;
dsk.unit = *arg - '0';
arg += 2;
dsk.slice = WHOLE_DISK_SLICE;
if (arg[1] == ',') {
if (*arg < '0' || *arg > '0' + NDOSPART)
return -1;
if ((dsk.slice = *arg - '0'))
dsk.slice++;
arg += 2;
}
if (arg[1] != ')' || *arg < 'a' || *arg > 'p')
return -1;
dsk.part = *arg - 'a';
arg += 2;
if (drv == -1)
drv = dsk.unit;
dsk.drive = (dsk.type <= TYPE_MAXHARD
? DRV_HARD : 0) + drv;
dsk_meta = 0;
fsread(0, NULL, 0);
}
if ((i = p - arg - !*(p - 1))) {
if (i >= sizeof(kname))
return -1;
memcpy(kname, arg, i + 1);
}
}
arg = p;
}
return 0;
}
static int
dskread(void *buf, unsigned lba, unsigned nblk)
{
struct dos_partition *dp;
struct disklabel *d;
char *sec;
unsigned sl, i;
if (!dsk_meta) {
sec = dmadat->secbuf;
dsk.start = 0;
if (drvread(sec, DOSBBSECTOR, 1))
return -1;
dp = (void *)(sec + DOSPARTOFF);
sl = dsk.slice;
if (sl < BASE_SLICE) {
for (i = 0; i < NDOSPART; i++)
if (dp[i].dp_typ == DOSPTYP_386BSD &&
(dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
sl = BASE_SLICE + i;
if (dp[i].dp_flag & 0x80 ||
dsk.slice == COMPATIBILITY_SLICE)
break;
}
if (dsk.slice == WHOLE_DISK_SLICE)
dsk.slice = sl;
}
if (sl != WHOLE_DISK_SLICE) {
if (sl != COMPATIBILITY_SLICE)
dp += sl - BASE_SLICE;
if (dp->dp_typ != DOSPTYP_386BSD) {
printf("Invalid %s\n", "slice");
return -1;
}
dsk.start = dp->dp_start;
}
if (drvread(sec, dsk.start + LABELSECTOR, 1))
return -1;
d = (void *)(sec + LABELOFFSET);
if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
if (dsk.part != RAW_PART) {
printf("Invalid %s\n", "label");
return -1;
}
} else {
if (!dsk.init) {
if (d->d_type == DTYPE_SCSI)
dsk.type = TYPE_DA;
dsk.init++;
}
if (dsk.part >= d->d_npartitions ||
!d->d_partitions[dsk.part].p_size) {
printf("Invalid %s\n", "partition");
return -1;
}
dsk.start += d->d_partitions[dsk.part].p_offset;
dsk.start -= d->d_partitions[RAW_PART].p_offset;
}
}
return drvread(buf, dsk.start + lba, nblk);
}
static int
printf(const char *fmt,...)
{
static const char digits[16] = "0123456789abcdef";
va_list ap;
char buf[10];
char *s;
unsigned r, u;
int c;
va_start(ap, fmt);
while ((c = *fmt++)) {
if (c == '%') {
c = *fmt++;
switch (c) {
case 'c':
putchar(va_arg(ap, int));
continue;
case 's':
for (s = va_arg(ap, char *); *s; s++)
putchar(*s);
continue;
case 'u':
case 'x':
r = c == 'u' ? 10U : 16U;
u = va_arg(ap, unsigned);
s = buf;
do
*s++ = digits[u % r];
while (u /= r);
while (--s >= buf)
putchar(*s);
continue;
}
}
putchar(c);
}
va_end(ap);
return 0;
}
static int
putchar(int c)
{
if (c == '\n')
xputc('\r');
return xputc(c);
}
static uint32_t
memsize(int type)
{
v86.addr = type;
v86.eax = 0x8800;
v86int();
return v86.eax;
}
static int
drvread(void *buf, unsigned lba, unsigned nblk)
{
static unsigned c = 0x2d5c7c2f;
printf("%c\b", c = c << 8 | c >> 24);
v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
v86.addr = XREADORG; /* call to xread in boot1 */
v86.es = VTOPSEG(buf);
v86.eax = lba;
v86.ebx = VTOPOFF(buf);
v86.ecx = lba >> 16;
v86.edx = nblk << 8 | dsk.drive;
v86int();
v86.ctl = V86_FLAGS;
if (V86_CY(v86.efl)) {
printf("Disk error 0x%x lba 0x%x\n", v86.eax >> 8 & 0xff, lba);
return -1;
}
return 0;
}
static int
keyhit(unsigned ticks)
{
uint32_t t0, t1;
if (opts & 1 << RBX_NOINTR)
return 0;
t0 = 0;
for (;;) {
if (xgetc(1))
return 1;
t1 = *(uint32_t *)PTOV(0x46c);
if (!t0)
t0 = t1;
if (t1 < t0 || t1 >= t0 + ticks)
return 0;
}
}
static int
xputc(int c)
{
if (ioctrl & IO_KEYBOARD)
putc(c);
if (ioctrl & IO_SERIAL)
sio_putc(c);
return c;
}
static int
xgetc(int fn)
{
if (opts & 1 << RBX_NOINTR)
return 0;
for (;;) {
if (ioctrl & IO_KEYBOARD && getc(1))
return fn ? 1 : getc(0);
if (ioctrl & IO_SERIAL && sio_ischar())
return fn ? 1 : sio_getc();
if (fn)
return 0;
}
}
static int
getc(int fn)
{
v86.addr = 0x16;
v86.eax = fn << 8;
v86int();
return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);
}
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