FreeBSD/Linux Kernel Cross Reference
sys/boot/boot.h

     /*      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 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 $
    */

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