It's based on the newest i386's one and has the advantage of: - ELF binary support. - UFS2 filesystem support. - Many FreeBSD slices support on a disk. Tested by: SATOU Tomokazu ( tomo1770 _ maple _ ocn _ ne _ jp ), WATANABE Kazuhiro ( CQG00620 _ nifty _ ne _ jp ) and nyan MFC after: 2 week Happy New Year in Japan!!
843 lines
18 KiB
C
843 lines
18 KiB
C
/*-
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* Copyright (c) 2008-2009 TAKAHASHI Yoshihiro
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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/diskpc98.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/cpufunc.h>
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#include <machine/elf.h>
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#include <machine/psl.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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#define IO_KEYBOARD 1
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#define IO_SERIAL 2
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#define SECOND 1 /* Circa that many ticks in a second. */
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#define RBX_ASKNAME 0x0 /* -a */
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#define RBX_SINGLE 0x1 /* -s */
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/* 0x2 is reserved for log2(RB_NOSYNC). */
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/* 0x3 is reserved for log2(RB_HALT). */
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/* 0x4 is reserved for log2(RB_INITNAME). */
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#define RBX_DFLTROOT 0x5 /* -r */
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#define RBX_KDB 0x6 /* -d */
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/* 0x7 is reserved for log2(RB_RDONLY). */
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/* 0x8 is reserved for log2(RB_DUMP). */
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/* 0x9 is reserved for log2(RB_MINIROOT). */
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#define RBX_CONFIG 0xa /* -c */
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#define RBX_VERBOSE 0xb /* -v */
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#define RBX_SERIAL 0xc /* -h */
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#define RBX_CDROM 0xd /* -C */
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/* 0xe is reserved for log2(RB_POWEROFF). */
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#define RBX_GDB 0xf /* -g */
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#define RBX_MUTE 0x10 /* -m */
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/* 0x11 is reserved for log2(RB_SELFTEST). */
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/* 0x12 is reserved for boot programs. */
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/* 0x13 is reserved for boot programs. */
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#define RBX_PAUSE 0x14 /* -p */
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#define RBX_QUIET 0x15 /* -q */
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#define RBX_NOINTR 0x1c /* -n */
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/* 0x1d is reserved for log2(RB_MULTIPLE) and is just misnamed here. */
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#define RBX_DUAL 0x1d /* -D */
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/* 0x1f is reserved for log2(RB_BOOTINFO). */
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/* pass: -a, -s, -r, -d, -c, -v, -h, -C, -g, -m, -p, -D */
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#define RBX_MASK (OPT_SET(RBX_ASKNAME) | OPT_SET(RBX_SINGLE) | \
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OPT_SET(RBX_DFLTROOT) | OPT_SET(RBX_KDB ) | \
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OPT_SET(RBX_CONFIG) | OPT_SET(RBX_VERBOSE) | \
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OPT_SET(RBX_SERIAL) | OPT_SET(RBX_CDROM) | \
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OPT_SET(RBX_GDB ) | OPT_SET(RBX_MUTE) | \
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OPT_SET(RBX_PAUSE) | OPT_SET(RBX_DUAL))
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#define PATH_CONFIG "/boot.config"
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#define PATH_BOOT3 "/boot/loader"
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#define PATH_KERNEL "/boot/kernel/kernel"
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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 V86_CY(x) ((x) & PSL_C)
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#define V86_ZR(x) ((x) & PSL_Z)
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#define DRV_DISK 0xf0
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#define DRV_UNIT 0x0f
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#define TYPE_AD 0
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#define TYPE_DA 1
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#define TYPE_FD 2
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#define OPT_SET(opt) (1 << (opt))
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#define OPT_CHECK(opt) ((opts) & OPT_SET(opt))
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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 const unsigned char dev_daua[NDEV] = {0x80, 0xa0, 0x90};
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static struct dsk {
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unsigned daua;
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unsigned type;
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unsigned disk;
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unsigned unit;
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unsigned head;
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unsigned sec;
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unsigned slice;
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unsigned part;
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unsigned start;
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} dsk;
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static char cmd[512], cmddup[512];
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static char kname[1024];
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static uint32_t opts;
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static int comspeed = SIOSPD;
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static struct bootinfo bootinfo;
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static uint8_t ioctrl = IO_KEYBOARD;
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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 xfsread(ino_t, void *, size_t);
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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 uint32_t memsize(void);
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static int drvread(void *, 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 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 inline int
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xfsread(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 uint32_t
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memsize(void)
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{
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u_char *p = (u_char *)PTOV(0);
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return *(p + 0x401) * 128 * 1024 + *(u_int16_t *)(p + 0x594) * 1024 * 1024;
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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.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
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v86.addr = PUTCORG; /* call to putc in boot1 */
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v86.eax = c;
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v86int();
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v86.ctl = V86_FLAGS;
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}
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static inline int
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is_scsi_hd(void)
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{
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if ((*(u_char *)PTOV(0x482) >> dsk.unit) & 0x01)
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return 1;
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return 0;
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}
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static inline void
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fix_sector_size(void)
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{
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u_char *p;
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p = (u_char *)PTOV(0x460 + dsk.unit * 4); /* SCSI equipment parameter */
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if ((p[0] & 0x1f) == 7) { /* SCSI MO */
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if (!(p[3] & 0x30)) { /* 256B / sector */
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p[3] |= 0x10; /* forced set 512B / sector */
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p[3 + 0xa1000] |= 0x10;
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}
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}
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}
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static inline uint32_t
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get_diskinfo(void)
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{
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if (dsk.disk == 0x30) { /* 1440KB FD */
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/* 80 cylinders, 2 heads, 18 sectors */
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return (80 << 16) | (2 << 8) | 18;
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} else if (dsk.disk == 0x90) { /* 1200KB FD */
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/* 80 cylinders, 2 heads, 15 sectors */
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return (80 << 16) | (2 << 8) | 15;
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} else if (dsk.disk == 0x80 || is_scsi_hd()) { /* IDE or SCSI HDD */
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v86.addr = 0x1b;
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v86.eax = 0x8400 | dsk.daua;
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v86int();
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return (v86.ecx << 16) | v86.edx;
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}
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/* SCSI MO or CD */
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fix_sector_size(); /* SCSI MO */
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/* other SCSI devices */
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return (65535 << 16) | (8 << 8) | 32;
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}
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static void
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set_dsk(void)
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{
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uint32_t di;
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di = get_diskinfo();
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dsk.head = (di >> 8) & 0xff;
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dsk.sec = di & 0xff;
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dsk.start = 0;
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}
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#ifdef GET_BIOSGEOM
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static uint32_t
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bd_getbigeom(int bunit)
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{
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int hds = 0;
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int unit = 0x80; /* IDE HDD */
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u_int addr = 0x55d;
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while (unit < 0xa7) {
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if (*(u_char *)PTOV(addr) & (1 << (unit & 0x0f)))
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if (hds++ == bunit)
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break;
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if (unit >= 0xA0) {
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int media = ((unsigned *)PTOV(0x460))[unit & 0x0F] & 0x1F;
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if (media == 7 && hds++ == bunit) /* SCSI MO */
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return(0xFFFE0820); /* C:65535 H:8 S:32 */
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}
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if (++unit == 0x84) {
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unit = 0xA0; /* SCSI HDD */
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addr = 0x482;
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}
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}
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if (unit == 0xa7)
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return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */
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v86.addr = 0x1b;
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v86.eax = 0x8400 | unit;
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v86int();
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if (v86.efl & 0x1)
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return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */
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return ((v86.ecx & 0xffff) << 16) | (v86.edx & 0xffff);
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}
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#endif
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static int
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check_slice(void)
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{
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struct pc98_partition *dp;
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char *sec;
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unsigned i, cyl;
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sec = dmadat->secbuf;
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cyl = *(uint16_t *)PTOV(ARGS);
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set_dsk();
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if (dsk.type == TYPE_FD)
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return (WHOLE_DISK_SLICE);
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if (drvread(sec, DOSBBSECTOR + 1))
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return (WHOLE_DISK_SLICE); /* Read error */
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dp = (void *)(sec + DOSPARTOFF);
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for (i = 0; i < NDOSPART; i++) {
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if (dp[i].dp_mid == DOSMID_386BSD) {
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if (dp[i].dp_scyl <= cyl && cyl <= dp[i].dp_ecyl)
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return (BASE_SLICE + i);
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}
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}
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return (WHOLE_DISK_SLICE);
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}
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int
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main(void)
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{
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#ifdef GET_BIOSGEOM
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int i;
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#endif
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int autoboot;
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ino_t ino;
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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.daua = *(uint8_t *)PTOV(0x584);
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dsk.disk = dsk.daua & DRV_DISK;
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dsk.unit = dsk.daua & DRV_UNIT;
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if (dsk.disk == 0x80)
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dsk.type = TYPE_AD;
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else if (dsk.disk == 0xa0)
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dsk.type = TYPE_DA;
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else /* if (dsk.disk == 0x30 || dsk.disk == 0x90) */
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dsk.type = TYPE_FD;
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dsk.slice = check_slice();
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#ifdef GET_BIOSGEOM
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for (i = 0; i < N_BIOS_GEOM; i++)
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bootinfo.bi_bios_geom[i] = bd_getbigeom(i);
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#endif
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bootinfo.bi_version = BOOTINFO_VERSION;
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bootinfo.bi_size = sizeof(bootinfo);
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bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */
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bootinfo.bi_extmem = memsize();
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bootinfo.bi_memsizes_valid++;
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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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fsread(ino, cmd, sizeof(cmd));
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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 (autoboot && !*kname) {
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memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
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if (!keyhit(3*SECOND)) {
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load();
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memcpy(kname, PATH_KERNEL, sizeof(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/pc98 boot\n"
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"Default: %u:%s(%u,%c)%s\n"
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"boot: ",
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dsk.unit, dev_nm[dsk.type], dsk.unit,
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'a' + dsk.part, kname);
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if (ioctrl & IO_SERIAL)
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sio_flush();
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if (!autoboot || keyhit(5*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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ino_t ino;
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uint32_t addr, x;
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int fmt, 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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fmt = 0;
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else if (IS_ELF(hdr.eh))
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fmt = 1;
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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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if (fmt == 0) {
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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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p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
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bootinfo.bi_symtab = VTOP(p);
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memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
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p += sizeof(hdr.ex.a_syms);
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if (hdr.ex.a_syms) {
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if (xfsread(ino, p, hdr.ex.a_syms))
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return;
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p += hdr.ex.a_syms;
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if (xfsread(ino, p, sizeof(int)))
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return;
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x = *(uint32_t *)p;
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p += sizeof(int);
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x -= sizeof(int);
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if (xfsread(ino, p, x))
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return;
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p += x;
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}
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} else {
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fs_off = hdr.eh.e_phoff;
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for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
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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++;
|
|
}
|
|
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, &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(kname);
|
|
bootinfo.bi_bios_dev = dsk.daua;
|
|
__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;
|
|
|
|
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(0x481) & 0x48) {
|
|
cp = "yes";
|
|
} else {
|
|
opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL);
|
|
cp = "no";
|
|
}
|
|
printf("Keyboard: %s\n", cp);
|
|
continue;
|
|
} 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[]). */
|
|
}
|
|
for (i = 0; c != optstr[i]; i++)
|
|
if (i == NOPT - 1)
|
|
return -1;
|
|
opts ^= OPT_SET(flags[i]);
|
|
}
|
|
ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
|
|
OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
|
|
if (ioctrl & IO_SERIAL)
|
|
sio_init(115200 / comspeed);
|
|
} 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.disk = dev_daua[dsk.type];
|
|
dsk.daua = dsk.disk | dsk.unit;
|
|
dsk_meta = 0;
|
|
}
|
|
if ((i = ep - arg)) {
|
|
if ((size_t)i >= sizeof(kname))
|
|
return -1;
|
|
memcpy(kname, arg, i + 1);
|
|
}
|
|
}
|
|
arg = p;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
dskread(void *buf, unsigned lba, unsigned nblk)
|
|
{
|
|
struct pc98_partition *dp;
|
|
struct disklabel *d;
|
|
char *sec;
|
|
unsigned sl, i;
|
|
u_char *p;
|
|
|
|
if (!dsk_meta) {
|
|
sec = dmadat->secbuf;
|
|
set_dsk();
|
|
if (dsk.type == TYPE_FD)
|
|
goto unsliced;
|
|
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_mid == DOSMID_386BSD) {
|
|
sl = BASE_SLICE + i;
|
|
break;
|
|
}
|
|
dsk.slice = sl;
|
|
}
|
|
if (sl != WHOLE_DISK_SLICE) {
|
|
dp += sl - BASE_SLICE;
|
|
if (dp->dp_mid != DOSMID_386BSD) {
|
|
printf("Invalid %s\n", "slice");
|
|
return -1;
|
|
}
|
|
dsk.start = dp->dp_scyl * dsk.head * dsk.sec +
|
|
dp->dp_shd * dsk.sec + dp->dp_ssect;
|
|
}
|
|
if (drvread(sec, dsk.start + LABELSECTOR))
|
|
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.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;
|
|
}
|
|
unsliced: ;
|
|
}
|
|
for (p = buf; nblk; p += 512, lba++, nblk--) {
|
|
if ((i = drvread(p, dsk.start + lba)))
|
|
return i;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
printf(const char *fmt,...)
|
|
{
|
|
va_list ap;
|
|
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)
|
|
{
|
|
static unsigned c = 0x2d5c7c2f;
|
|
unsigned bpc, x, cyl, head, sec;
|
|
|
|
bpc = dsk.sec * dsk.head;
|
|
cyl = lba / bpc;
|
|
x = lba % bpc;
|
|
head = x / dsk.sec;
|
|
sec = x % dsk.sec;
|
|
|
|
if (!OPT_CHECK(RBX_QUIET))
|
|
printf("%c\b", c = c << 8 | c >> 24);
|
|
v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
|
|
v86.addr = READORG; /* call to read in boot1 */
|
|
v86.ecx = cyl;
|
|
v86.edx = (head << 8) | sec;
|
|
v86.edi = lba;
|
|
v86.ebx = 512;
|
|
v86.es = VTOPSEG(buf);
|
|
v86.ebp = VTOPOFF(buf);
|
|
v86int();
|
|
v86.ctl = V86_FLAGS;
|
|
if (V86_CY(v86.efl)) {
|
|
printf("error %u c/h/s %u/%u/%u lba %u\n", v86.eax >> 8 & 0xff,
|
|
cyl, head, sec, lba);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
delay(void)
|
|
{
|
|
int i;
|
|
|
|
i = 800;
|
|
do {
|
|
outb(0x5f, 0); /* about 600ns */
|
|
} while (--i >= 0);
|
|
}
|
|
|
|
static int
|
|
keyhit(unsigned sec)
|
|
{
|
|
unsigned i;
|
|
|
|
if (OPT_CHECK(RBX_NOINTR))
|
|
return 0;
|
|
for (i = 0; i < sec * 1000; i++) {
|
|
if (xgetc(1))
|
|
return 1;
|
|
delay();
|
|
}
|
|
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 (OPT_CHECK(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 = 0x18;
|
|
v86.eax = fn << 8;
|
|
v86int();
|
|
if (fn)
|
|
return (v86.ebx >> 8) & 0x01;
|
|
else
|
|
return v86.eax & 0xff;
|
|
}
|