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freebsd-dev/sys/boot/i386/boot2/boot2.c
Warner Losh 6422ac8292 Fix mistake when transitioning to the new defines with ZFS loader. I 
hate adding yet another define, but it is the lessor of the evil
choices available. Kill another evil by removing PATH_BOOT3 and
replacing it with PATH_LOADER or PATH_LOADER_ZFS as appropriate.

PR: 206659
2016-01-27 16:36:18 +00:00

647 lines
13 KiB
C
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/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/disklabel.h>
#include <sys/diskmbr.h>
#include <sys/dirent.h>
#include <sys/reboot.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"
#include "paths.h"
#include "rbx.h"
/* Define to 0 to omit serial support */
#ifndef SERIAL
#define SERIAL 1
#endif
#define IO_KEYBOARD 1
#define IO_SERIAL 2
#if SERIAL
#define DO_KBD (ioctrl & IO_KEYBOARD)
#define DO_SIO (ioctrl & IO_SERIAL)
#else
#define DO_KBD (1)
#define DO_SIO (0)
#endif
#define SECOND 18 /* Circa that many ticks in a second. */
#define ARGS 0x900
#define NOPT 14
#define NDEV 3
#define MEM_BASE 0x12
#define MEM_EXT 0x15
#define DRV_HARD 0x80
#define DRV_MASK 0x7f
#define TYPE_AD 0
#define TYPE_DA 1
#define TYPE_MAXHARD TYPE_DA
#define TYPE_FD 2
extern uint32_t _end;
static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
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_PAUSE,
RBX_QUIET,
RBX_DFLTROOT,
RBX_SINGLE,
RBX_VERBOSE
};
static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
static const unsigned char dev_maj[NDEV] = {30, 4, 2};
static struct dsk {
unsigned drive;
unsigned type;
unsigned unit;
uint8_t slice;
uint8_t part;
unsigned start;
int init;
} dsk;
static char cmd[512], cmddup[512], knamebuf[1024];
static const char *kname;
uint32_t opts;
static struct bootinfo bootinfo;
#if SERIAL
static int comspeed = SIOSPD;
static uint8_t ioctrl = IO_KEYBOARD;
#endif
int main(void);
void exit(int);
static void load(void);
static int parse(void);
static int dskread(void *, unsigned, unsigned);
static void printf(const char *,...);
static void putchar(int);
static int drvread(void *, unsigned, unsigned);
static int keyhit(unsigned);
static int xputc(int);
static int xgetc(int);
static inline int getc(int);
static void memcpy(void *, const void *, int);
static void
memcpy(void *dst, const void *src, int len)
{
const char *s = src;
char *d = dst;
while (len--)
*d++ = *s++;
}
static inline int
strcmp(const char *s1, const char *s2)
{
for (; *s1 == *s2 && *s1; s1++, s2++);
return (unsigned char)*s1 - (unsigned char)*s2;
}
#define UFS_SMALL_CGBASE
#include "ufsread.c"
static inline int
xfsread(ufs_ino_t inode, void *buf, size_t nbyte)
{
if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
printf("Invalid %s\n", "format");
return -1;
}
return 0;
}
static inline void
getstr(void)
{
char *s;
int c;
s = cmd;
for (;;) {
switch (c = xgetc(0)) {
case 0:
break;
case '\177':
case '\b':
if (s > cmd) {
s--;
printf("\b \b");
}
break;
case '\n':
case '\r':
*s = 0;
return;
default:
if (s - cmd < sizeof(cmd) - 1)
*s++ = c;
putchar(c);
}
}
}
static inline void
putc(int c)
{
v86.addr = 0x10;
v86.eax = 0xe00 | (c & 0xff);
v86.ebx = 0x7;
v86int();
}
int
main(void)
{
uint8_t autoboot;
ufs_ino_t ino;
size_t nbyte;
dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
v86.ctl = V86_FLAGS;
v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
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);
/* Process configuration file */
autoboot = 1;
if ((ino = lookup(PATH_CONFIG)) ||
(ino = lookup(PATH_DOTCONFIG))) {
nbyte = fsread(ino, cmd, sizeof(cmd) - 1);
cmd[nbyte] = '\0';
}
if (*cmd) {
memcpy(cmddup, cmd, sizeof(cmd));
if (parse())
autoboot = 0;
if (!OPT_CHECK(RBX_QUIET))
printf("%s: %s", PATH_CONFIG, cmddup);
/* 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 (!kname) {
kname = PATH_LOADER;
if (autoboot && !keyhit(3*SECOND)) {
load();
kname = PATH_KERNEL;
}
}
/* Present the user with the boot2 prompt. */
for (;;) {
if (!autoboot || !OPT_CHECK(RBX_QUIET))
printf("\nFreeBSD/x86 boot\n"
"Default: %u:%s(%u,%c)%s\n"
"boot: ",
dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
'a' + dsk.part, kname);
if (DO_SIO)
sio_flush();
if (!autoboot || keyhit(3*SECOND))
getstr();
else if (!autoboot || !OPT_CHECK(RBX_QUIET))
putchar('\n');
autoboot = 0;
if (parse())
putchar('\a');
else
load();
}
}
/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
void
exit(int x)
{
}
static void
load(void)
{
union {
struct exec ex;
Elf32_Ehdr eh;
} hdr;
static Elf32_Phdr ep[2];
static Elf32_Shdr es[2];
caddr_t p;
ufs_ino_t ino;
uint32_t addr;
int k;
uint8_t i, j;
if (!(ino = lookup(kname))) {
if (!ls)
printf("No %s\n", kname);
return;
}
if (xfsread(ino, &hdr, sizeof(hdr)))
return;
if (N_GETMAGIC(hdr.ex) == ZMAGIC) {
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;
} else if (IS_ELF(hdr.eh)) {
fs_off = hdr.eh.e_phoff;
for (j = k = 0; k < hdr.eh.e_phnum && j < 2; k++) {
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++) {
*(Elf32_Word *)p = 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);
} else {
printf("Invalid %s\n", "format");
return;
}
bootinfo.bi_kernelname = VTOP(kname);
bootinfo.bi_bios_dev = dsk.drive;
__exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
MAKEBOOTDEV(dev_maj[dsk.type], dsk.slice, dsk.unit, dsk.part),
0, 0, 0, VTOP(&bootinfo));
}
static int
parse()
{
char *arg = cmd;
char *ep, *p, *q;
const char *cp;
unsigned int drv;
int c, i, j;
size_t k;
while ((c = *arg++)) {
if (c == ' ' || c == '\t' || c == '\n')
continue;
for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
ep = p;
if (*p)
*p++ = 0;
if (c == '-') {
while ((c = *arg++)) {
if (c == 'P') {
if (*(uint8_t *)PTOV(0x496) & 0x10) {
cp = "yes";
} else {
opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL);
cp = "no";
}
printf("Keyboard: %s\n", cp);
continue;
#if SERIAL
} else if (c == 'S') {
j = 0;
while ((unsigned int)(i = *arg++ - '0') <= 9)
j = j * 10 + i;
if (j > 0 && i == -'0') {
comspeed = j;
break;
}
/* Fall through to error below ('S' not in optstr[]). */
#endif
}
for (i = 0; c != optstr[i]; i++)
if (i == NOPT - 1)
return -1;
opts ^= OPT_SET(flags[i]);
}
#if SERIAL
ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
if (DO_SIO) {
if (sio_init(115200 / comspeed) != 0)
ioctrl &= ~IO_SERIAL;
}
#endif
} else {
for (q = arg--; *q && *q != '('; q++);
if (*q) {
drv = -1;
if (arg[1] == ':') {
drv = *arg - '0';
if (drv > 9)
return (-1);
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;
dsk.unit = *arg - '0';
if (arg[1] != ',' || dsk.unit > 9)
return -1;
arg += 2;
dsk.slice = WHOLE_DISK_SLICE;
if (arg[1] == ',') {
dsk.slice = *arg - '0' + 1;
if (dsk.slice > NDOSPART + 1)
return -1;
arg += 2;
}
if (arg[1] != ')')
return -1;
dsk.part = *arg - 'a';
if (dsk.part > 7)
return (-1);
arg += 2;
if (drv == -1)
drv = dsk.unit;
dsk.drive = (dsk.type <= TYPE_MAXHARD
? DRV_HARD : 0) + drv;
dsk_meta = 0;
}
k = ep - arg;
if (k > 0) {
if (k >= sizeof(knamebuf))
return -1;
memcpy(knamebuf, arg, k + 1);
kname = knamebuf;
}
}
arg = p;
}
return 0;
}
static int
dskread(void *buf, unsigned lba, unsigned nblk)
{
struct dos_partition *dp;
struct disklabel *d;
char *sec;
unsigned i;
uint8_t sl;
const char *reason;
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) {
reason = "slice";
goto error;
}
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) {
reason = "label";
goto error;
}
} 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) {
reason = "partition";
goto error;
}
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);
error:
printf("Invalid %s\n", reason);
return -1;
}
static void
printf(const char *fmt,...)
{
va_list ap;
static char buf[10];
char *s;
unsigned 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':
u = va_arg(ap, unsigned);
s = buf;
do
*s++ = '0' + u % 10U;
while (u /= 10U);
while (--s >= buf)
putchar(*s);
continue;
}
}
putchar(c);
}
va_end(ap);
return;
}
static void
putchar(int c)
{
if (c == '\n')
xputc('\r');
xputc(c);
}
static int
drvread(void *buf, unsigned lba, unsigned nblk)
{
static unsigned c = 0x2d5c7c2f;
if (!OPT_CHECK(RBX_QUIET)) {
xputc(c = c << 8 | c >> 24);
xputc('\b');
}
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("error %u lba %u\n", v86.eax >> 8 & 0xff, lba);
return -1;
}
return 0;
}
static int
keyhit(unsigned ticks)
{
uint32_t t0, t1;
if (OPT_CHECK(RBX_NOINTR))
return 0;
t0 = 0;
for (;;) {
if (xgetc(1))
return 1;
t1 = *(uint32_t *)PTOV(0x46c);
if (!t0)
t0 = t1;
if ((uint32_t)(t1 - t0) >= ticks)
return 0;
}
}
static int
xputc(int c)
{
if (DO_KBD)
putc(c);
if (DO_SIO)
sio_putc(c);
return c;
}
static int
getc(int fn)
{
v86.addr = 0x16;
v86.eax = fn << 8;
v86int();
return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);
}
static int
xgetc(int fn)
{
if (OPT_CHECK(RBX_NOINTR))
return 0;
for (;;) {
if (DO_KBD && getc(1))
return fn ? 1 : getc(0);
if (DO_SIO && sio_ischar())
return fn ? 1 : sio_getc();
if (fn)
return 0;
}
}
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