minix/boot/boot.h
2009-08-17 18:49:15 +00:00

213 lines
6 KiB
C
Executable file

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