a1ac14f7d4
Curiously, changing whitespace seems to cause the md5 of the .o files to differ these days hence the following testing strategy: Tested by: objdump -d | md5 (both in-tree clang and lang/gcc6)
659 lines
12 KiB
C
659 lines
12 KiB
C
/*-
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* Copyright (c) 1998 Robert Nordier
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/disklabel.h>
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#include <sys/diskmbr.h>
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#include <sys/dirent.h>
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#include <sys/reboot.h>
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#include <machine/bootinfo.h>
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#include <machine/elf.h>
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#include <stdarg.h>
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#include <a.out.h>
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#include <btxv86.h>
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#include "boot2.h"
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#include "lib.h"
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#include "paths.h"
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#include "rbx.h"
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/* Define to 0 to omit serial support */
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#ifndef SERIAL
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#define SERIAL 1
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#endif
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#define IO_KEYBOARD 1
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#define IO_SERIAL 2
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#if SERIAL
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#define DO_KBD (ioctrl & IO_KEYBOARD)
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#define DO_SIO (ioctrl & IO_SERIAL)
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#else
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#define DO_KBD (1)
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#define DO_SIO (0)
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#endif
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#define SECOND 18 /* Circa that many ticks in a second. */
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#define ARGS 0x900
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#define NOPT 14
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#define NDEV 3
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#define MEM_BASE 0x12
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#define MEM_EXT 0x15
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#define DRV_HARD 0x80
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#define DRV_MASK 0x7f
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#define TYPE_AD 0
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#define TYPE_DA 1
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#define TYPE_MAXHARD TYPE_DA
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#define TYPE_FD 2
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extern uint32_t _end;
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static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
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static const unsigned char flags[NOPT] = {
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RBX_DUAL,
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RBX_SERIAL,
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RBX_ASKNAME,
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RBX_CDROM,
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RBX_CONFIG,
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RBX_KDB,
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RBX_GDB,
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RBX_MUTE,
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RBX_NOINTR,
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RBX_PAUSE,
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RBX_QUIET,
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RBX_DFLTROOT,
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RBX_SINGLE,
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RBX_VERBOSE
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};
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static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
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static const unsigned char dev_maj[NDEV] = {30, 4, 2};
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static struct dsk {
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unsigned drive;
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unsigned type;
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unsigned unit;
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uint8_t slice;
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uint8_t part;
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unsigned start;
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int init;
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} dsk;
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static char cmd[512], cmddup[512], knamebuf[1024];
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static const char *kname;
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uint32_t opts;
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static struct bootinfo bootinfo;
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#if SERIAL
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static int comspeed = SIOSPD;
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static uint8_t ioctrl = IO_KEYBOARD;
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#endif
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int main(void);
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void exit(int);
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static void load(void);
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static int parse(void);
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static int dskread(void *, unsigned, unsigned);
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static void printf(const char *,...);
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static void putchar(int);
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static int drvread(void *, unsigned, unsigned);
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static int keyhit(unsigned);
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static int xputc(int);
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static int xgetc(int);
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static inline int getc(int);
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static void memcpy(void *, const void *, int);
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static void
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memcpy(void *dst, const void *src, int len)
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{
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const char *s = src;
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char *d = dst;
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while (len--)
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*d++ = *s++;
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}
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static inline int
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strcmp(const char *s1, const char *s2)
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{
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for (; *s1 == *s2 && *s1; s1++, s2++);
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return (unsigned char)*s1 - (unsigned char)*s2;
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}
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#define UFS_SMALL_CGBASE
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#include "ufsread.c"
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static int
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xfsread(ufs_ino_t inode, void *buf, size_t nbyte)
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{
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if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
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printf("Invalid %s\n", "format");
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return -1;
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}
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return 0;
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}
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static inline void
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getstr(void)
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{
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char *s;
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int c;
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s = cmd;
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for (;;) {
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switch (c = xgetc(0)) {
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case 0:
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break;
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case '\177':
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case '\b':
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if (s > cmd) {
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s--;
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printf("\b \b");
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}
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break;
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case '\n':
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case '\r':
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*s = 0;
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return;
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default:
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if (s - cmd < sizeof(cmd) - 1)
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*s++ = c;
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putchar(c);
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}
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}
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}
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static inline void
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putc(int c)
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{
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v86.addr = 0x10;
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v86.eax = 0xe00 | (c & 0xff);
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v86.ebx = 0x7;
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v86int();
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}
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int
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main(void)
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{
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uint8_t autoboot;
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ufs_ino_t ino;
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size_t nbyte;
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dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
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v86.ctl = V86_FLAGS;
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v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
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dsk.drive = *(uint8_t *)PTOV(ARGS);
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dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
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dsk.unit = dsk.drive & DRV_MASK;
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dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
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bootinfo.bi_version = BOOTINFO_VERSION;
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bootinfo.bi_size = sizeof(bootinfo);
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/* Process configuration file */
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autoboot = 1;
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if ((ino = lookup(PATH_CONFIG)) ||
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(ino = lookup(PATH_DOTCONFIG))) {
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nbyte = fsread(ino, cmd, sizeof(cmd) - 1);
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cmd[nbyte] = '\0';
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}
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if (*cmd) {
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memcpy(cmddup, cmd, sizeof(cmd));
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if (parse())
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autoboot = 0;
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if (!OPT_CHECK(RBX_QUIET))
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printf("%s: %s", PATH_CONFIG, cmddup);
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/* Do not process this command twice */
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*cmd = 0;
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}
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/*
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* Try to exec stage 3 boot loader. If interrupted by a keypress,
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* or in case of failure, try to load a kernel directly instead.
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*/
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if (!kname) {
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kname = PATH_LOADER;
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if (autoboot && !keyhit(3*SECOND)) {
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load();
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kname = PATH_KERNEL;
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}
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}
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/* Present the user with the boot2 prompt. */
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for (;;) {
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if (!autoboot || !OPT_CHECK(RBX_QUIET))
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printf("\nFreeBSD/x86 boot\n"
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"Default: %u:%s(%u,%c)%s\n"
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"boot: ",
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dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
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'a' + dsk.part, kname);
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if (DO_SIO)
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sio_flush();
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if (!autoboot || keyhit(3*SECOND))
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getstr();
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else if (!autoboot || !OPT_CHECK(RBX_QUIET))
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putchar('\n');
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autoboot = 0;
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if (parse())
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putchar('\a');
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else
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load();
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}
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}
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/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
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void
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exit(int x)
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{
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}
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static void
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load(void)
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{
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union {
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struct exec ex;
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Elf32_Ehdr eh;
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} hdr;
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static Elf32_Phdr ep[2];
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static Elf32_Shdr es[2];
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caddr_t p;
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ufs_ino_t ino;
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uint32_t addr;
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int k;
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uint8_t i, j;
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if (!(ino = lookup(kname))) {
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if (!ls)
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printf("No %s\n", kname);
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return;
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}
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if (xfsread(ino, &hdr, sizeof(hdr)))
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return;
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if (N_GETMAGIC(hdr.ex) == ZMAGIC) {
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addr = hdr.ex.a_entry & 0xffffff;
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p = PTOV(addr);
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fs_off = PAGE_SIZE;
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if (xfsread(ino, p, hdr.ex.a_text))
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return;
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p += roundup2(hdr.ex.a_text, PAGE_SIZE);
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if (xfsread(ino, p, hdr.ex.a_data))
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return;
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} else if (IS_ELF(hdr.eh)) {
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fs_off = hdr.eh.e_phoff;
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for (j = k = 0; k < hdr.eh.e_phnum && j < 2; k++) {
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if (xfsread(ino, ep + j, sizeof(ep[0])))
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return;
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if (ep[j].p_type == PT_LOAD)
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j++;
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}
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for (i = 0; i < 2; i++) {
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p = PTOV(ep[i].p_paddr & 0xffffff);
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fs_off = ep[i].p_offset;
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if (xfsread(ino, p, ep[i].p_filesz))
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return;
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}
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p += roundup2(ep[1].p_memsz, PAGE_SIZE);
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bootinfo.bi_symtab = VTOP(p);
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if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
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fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
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(hdr.eh.e_shstrndx + 1);
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if (xfsread(ino, &es, sizeof(es)))
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return;
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for (i = 0; i < 2; i++) {
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*(Elf32_Word *)p = es[i].sh_size;
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p += sizeof(es[i].sh_size);
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fs_off = es[i].sh_offset;
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if (xfsread(ino, p, es[i].sh_size))
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return;
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p += es[i].sh_size;
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}
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}
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addr = hdr.eh.e_entry & 0xffffff;
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bootinfo.bi_esymtab = VTOP(p);
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} else {
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printf("Invalid %s\n", "format");
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return;
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}
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bootinfo.bi_kernelname = VTOP(kname);
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bootinfo.bi_bios_dev = dsk.drive;
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__exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
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MAKEBOOTDEV(dev_maj[dsk.type], dsk.slice, dsk.unit, dsk.part),
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0, 0, 0, VTOP(&bootinfo));
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}
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static int
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parse()
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{
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char *arg = cmd;
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char *ep, *p, *q;
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const char *cp;
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unsigned int drv;
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int c, i, j;
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size_t k;
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while ((c = *arg++)) {
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if (c == ' ' || c == '\t' || c == '\n')
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continue;
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for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
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ep = p;
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if (*p)
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*p++ = 0;
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if (c == '-') {
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while ((c = *arg++)) {
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if (c == 'P') {
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if (*(uint8_t *)PTOV(0x496) & 0x10) {
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cp = "yes";
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} else {
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opts |= OPT_SET(RBX_DUAL) |
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OPT_SET(RBX_SERIAL);
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cp = "no";
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}
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printf("Keyboard: %s\n", cp);
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continue;
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#if SERIAL
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} else if (c == 'S') {
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j = 0;
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while ((u_int)(i = *arg++ - '0') <= 9)
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j = j * 10 + i;
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if (j > 0 && i == -'0') {
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comspeed = j;
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break;
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}
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/*
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* Fall through to error below
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* ('S' not in optstr[]).
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*/
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#endif
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}
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for (i = 0; c != optstr[i]; i++)
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if (i == NOPT - 1)
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return -1;
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opts ^= OPT_SET(flags[i]);
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}
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#if SERIAL
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ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
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OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
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if (DO_SIO) {
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if (sio_init(115200 / comspeed) != 0)
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ioctrl &= ~IO_SERIAL;
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}
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#endif
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} else {
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for (q = arg--; *q && *q != '('; q++);
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if (*q) {
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drv = -1;
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if (arg[1] == ':') {
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drv = *arg - '0';
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if (drv > 9)
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return (-1);
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arg += 2;
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}
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if (q - arg != 2)
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return (-1);
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for (i = 0; arg[0] != dev_nm[i][0] ||
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arg[1] != dev_nm[i][1]; i++)
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if (i == NDEV - 1)
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return -1;
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dsk.type = i;
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arg += 3;
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dsk.unit = *arg - '0';
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if (arg[1] != ',' || dsk.unit > 9)
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return -1;
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arg += 2;
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dsk.slice = WHOLE_DISK_SLICE;
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if (arg[1] == ',') {
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dsk.slice = *arg - '0' + 1;
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if (dsk.slice > NDOSPART + 1)
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return -1;
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arg += 2;
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}
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if (arg[1] != ')')
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return -1;
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dsk.part = *arg - 'a';
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if (dsk.part > 7)
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return (-1);
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arg += 2;
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if (drv == -1)
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drv = dsk.unit;
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dsk.drive = (dsk.type <= TYPE_MAXHARD
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? DRV_HARD : 0) + drv;
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dsk_meta = 0;
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}
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k = ep - arg;
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if (k > 0) {
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if (k >= sizeof(knamebuf))
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return -1;
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memcpy(knamebuf, arg, k + 1);
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kname = knamebuf;
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}
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}
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arg = p;
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}
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return 0;
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}
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static int
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dskread(void *buf, unsigned lba, unsigned nblk)
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{
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struct dos_partition *dp;
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struct disklabel *d;
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char *sec;
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unsigned i;
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uint8_t sl;
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const char *reason;
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if (!dsk_meta) {
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sec = dmadat->secbuf;
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dsk.start = 0;
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if (drvread(sec, DOSBBSECTOR, 1))
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return -1;
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dp = (void *)(sec + DOSPARTOFF);
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sl = dsk.slice;
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if (sl < BASE_SLICE) {
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for (i = 0; i < NDOSPART; i++)
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if (dp[i].dp_typ == DOSPTYP_386BSD &&
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(dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
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sl = BASE_SLICE + i;
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if (dp[i].dp_flag & 0x80 ||
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dsk.slice == COMPATIBILITY_SLICE)
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break;
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}
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if (dsk.slice == WHOLE_DISK_SLICE)
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dsk.slice = sl;
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}
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if (sl != WHOLE_DISK_SLICE) {
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if (sl != COMPATIBILITY_SLICE)
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dp += sl - BASE_SLICE;
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if (dp->dp_typ != DOSPTYP_386BSD) {
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reason = "slice";
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goto error;
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}
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dsk.start = dp->dp_start;
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}
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if (drvread(sec, dsk.start + LABELSECTOR, 1))
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return -1;
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d = (void *)(sec + LABELOFFSET);
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if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
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if (dsk.part != RAW_PART) {
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reason = "label";
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goto error;
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}
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} else {
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if (!dsk.init) {
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if (d->d_type == DTYPE_SCSI)
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dsk.type = TYPE_DA;
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dsk.init++;
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}
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if (dsk.part >= d->d_npartitions ||
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!d->d_partitions[dsk.part].p_size) {
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reason = "partition";
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goto error;
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}
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dsk.start += d->d_partitions[dsk.part].p_offset;
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dsk.start -= d->d_partitions[RAW_PART].p_offset;
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}
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}
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return drvread(buf, dsk.start + lba, nblk);
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error:
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printf("Invalid %s\n", reason);
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return -1;
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}
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static void
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printf(const char *fmt,...)
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{
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va_list ap;
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static char buf[10];
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char *s;
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unsigned u;
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int c;
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|
|
|
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;
|
|
}
|
|
}
|