214 lines
6.0 KiB
C
214 lines
6.0 KiB
C
/* boot.h - Info between different parts of boot. Author: Kees J. Bot
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*/
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#ifndef DEBUG
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#define DEBUG 0
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#endif
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/* Constants describing the metal: */
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#define SECTOR_SIZE 512
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#define SECTOR_SHIFT 9
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#define RATIO(b) ((b) / SECTOR_SIZE)
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#define PARAMSEC 1 /* Sector containing boot parameters. */
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#define DSKBASE 0x1E /* Floppy disk parameter vector. */
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#define DSKPARSIZE 11 /* There are this many bytes of parameters. */
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#define ESC '\33' /* Escape key. */
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#define HEADERPOS 0x00600L /* Place for an array of struct exec's. */
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#define FREEPOS 0x08000L /* Memory from FREEPOS to caddr is free to
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* play with.
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*/
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#if BIOS
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#define MSEC_PER_TICK 55 /* Clock does 18.2 ticks per second. */
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#define TICKS_PER_DAY 0x1800B0L /* After 24 hours it wraps. */
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#endif
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#if UNIX
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#define MSEC_PER_TICK 1000 /* Clock does 18.2 ticks per second. */
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#define TICKS_PER_DAY 86400L /* Doesn't wrap, but that doesn't matter. */
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#endif
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#define BOOTPOS 0x07C00L /* Bootstraps are loaded here. */
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#define SIGNATURE 0xAA55 /* Proper bootstraps have this signature. */
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#define SIGNATOFF 510 /* Offset within bootblock. */
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/* BIOS video modes. */
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#define MONO_MODE 0x07 /* 80x25 monochrome. */
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#define COLOR_MODE 0x03 /* 80x25 color. */
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/* Variables shared with boothead.s: */
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#ifndef EXTERN
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#define EXTERN extern
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#endif
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typedef struct vector { /* 8086 vector */
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u16_t offset;
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u16_t segment;
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} vector;
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EXTERN vector rem_part; /* Boot partition table entry. */
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EXTERN u32_t caddr, daddr; /* Code and data address of the boot program. */
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EXTERN u32_t runsize; /* Size of this program. */
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EXTERN u16_t device; /* Drive being booted from. */
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typedef struct { /* One chunk of free memory. */
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u32_t base; /* Start byte. */
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u32_t size; /* Number of bytes. */
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} memory;
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EXTERN memory mem[3]; /* List of available memory. */
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EXTERN int mon_return; /* Monitor stays in memory? */
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typedef struct bios_env
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{
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u16_t ax;
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u16_t bx;
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u16_t cx;
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u16_t flags;
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} bios_env_t;
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#define FL_CARRY 0x0001 /* carry flag */
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/* Functions defined by boothead.s: */
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void exit(int code);
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/* Exit the monitor. */
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u32_t mon2abs(void *ptr);
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/* Local monitor address to absolute address. */
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u32_t vec2abs(vector *vec);
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/* Vector to absolute address. */
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void raw_copy(u32_t dstaddr, u32_t srcaddr, u32_t count);
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/* Copy bytes from anywhere to anywhere. */
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u16_t get_word(u32_t addr);
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/* Get a word from anywhere. */
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void put_word(u32_t addr, U16_t word);
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/* Put a word anywhere. */
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void relocate(void);
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/* Switch to a copy of this program. */
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int dev_open(void), dev_close(void);
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/* Open device and determine params / close device. */
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int dev_boundary(u32_t sector);
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/* True if sector is on a track boundary. */
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int readsectors(u32_t bufaddr, u32_t sector, U8_t count);
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/* Read 1 or more sectors from "device". */
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int writesectors(u32_t bufaddr, u32_t sector, U8_t count);
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/* Write 1 or more sectors to "device". */
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int getch(void);
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/* Read a keypress. */
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void scan_keyboard(void);
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/* Read keypress directly from kb controller. */
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void ungetch(int c);
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/* Undo a keypress. */
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int escape(void);
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/* True if escape typed. */
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void putch(int c);
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/* Send a character to the screen. */
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#if BIOS
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void pause(void);
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/* Wait for an interrupt. */
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void serial_init(int line);
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#endif /* Enable copying console I/O to a serial line. */
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void set_mode(unsigned mode);
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void clear_screen(void);
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/* Set video mode / clear the screen. */
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u16_t get_bus(void);
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/* System bus type, XT, AT, or MCA. */
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u16_t get_video(void);
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/* Display type, MDA to VGA. */
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u32_t get_tick(void);
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/* Current value of the clock tick counter. */
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void bootstrap(int device, struct part_entry *entry);
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/* Execute a bootstrap routine for a different O.S. */
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void minix(u32_t koff, u32_t kcs, u32_t kds,
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char *bootparams, size_t paramsize, u32_t aout);
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/* Start Minix. */
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void int15(bios_env_t *);
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/* Shared between boot.c and bootimage.c: */
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/* Sticky attributes. */
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#define E_SPECIAL 0x01 /* These are known to the program. */
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#define E_DEV 0x02 /* The value is a device name. */
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#define E_RESERVED 0x04 /* May not be set by user, e.g. 'boot' */
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#define E_STICKY 0x07 /* Don't go once set. */
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/* Volatile attributes. */
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#define E_VAR 0x08 /* Variable */
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#define E_FUNCTION 0x10 /* Function definition. */
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/* Variables, functions, and commands. */
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typedef struct environment {
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struct environment *next;
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char flags;
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char *name; /* name = value */
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char *arg; /* name(arg) {value} */
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char *value;
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char *defval; /* Safehouse for default values. */
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} environment;
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EXTERN environment *env; /* Lists the environment. */
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char *b_value(char *name); /* Get/set the value of a variable. */
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int b_setvar(int flags, char *name, char *value);
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void b_unset(char *name);
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void parse_code(char *code); /* Parse boot monitor commands. */
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extern int fsok; /* True if the boot device contains an FS. */
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EXTERN u32_t lowsec; /* Offset to the file system on the boot device. */
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/* Called by boot.c: */
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void bootminix(void); /* Load and start a Minix image. */
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/* Called by bootimage.c: */
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void readerr(off_t sec, int err);
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/* Report a read error. */
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char *ul2a(u32_t n, unsigned b), *ul2a10(u32_t n);
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/* Transform u32_t to ASCII at base b or base 10. */
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long a2l(char *a);
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/* Cheap atol(). */
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unsigned a2x(char *a);
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/* ASCII to hex. */
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dev_t name2dev(char *name);
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/* Translate a device name to a device number. */
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int numprefix(char *s, char **ps);
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/* True for a numeric prefix. */
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int numeric(char *s);
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/* True for a numeric string. */
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char *unix_err(int err);
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/* Give a descriptive text for some UNIX errors. */
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int run_trailer(void);
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/* Run the trailer function. */
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#if DOS
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/* The monitor runs under MS-DOS. */
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extern char PSP[256]; /* Program Segment Prefix. */
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EXTERN char *vdisk; /* Name of the virtual disk. */
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EXTERN char *drun; /* Initial command from DOS command line. */
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#else
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/* The monitor uses only the BIOS. */
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#define DOS 0
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#endif
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void readblock(off_t, char *, int);
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void delay(char *);
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/*
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* $PchId: boot.h,v 1.12 2002/02/27 19:42:45 philip Exp $
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*/
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