| 1 | /* boot.h - Info between different parts of boot. Author: Kees J. Bot
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| 2 | */
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| 3 |
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| 4 | #ifndef DEBUG
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| 5 | #define DEBUG 0
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| 6 | #endif
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| 7 |
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| 8 | /* Constants describing the metal: */
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| 9 |
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| 10 | #define SECTOR_SIZE 512
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| 11 | #define SECTOR_SHIFT 9
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| 12 | #define RATIO(b) ((b) / SECTOR_SIZE)
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| 13 |
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| 14 | #define PARAMSEC 1 /* Sector containing boot parameters. */
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| 15 |
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| 16 | #define DSKBASE 0x1E /* Floppy disk parameter vector. */
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| 17 | #define DSKPARSIZE 11 /* There are this many bytes of parameters. */
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| 18 |
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| 19 | #define ESC '\33' /* Escape key. */
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| 20 |
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| 21 | #define HEADERPOS 0x00600L /* Place for an array of struct exec's. */
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| 22 |
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| 23 | #define FREEPOS 0x08000L /* Memory from FREEPOS to caddr is free to
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| 24 | * play with.
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| 25 | */
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| 26 | #if BIOS
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| 27 | #define MSEC_PER_TICK 55 /* Clock does 18.2 ticks per second. */
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| 28 | #define TICKS_PER_DAY 0x1800B0L /* After 24 hours it wraps. */
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| 29 | #endif
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| 30 |
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| 31 | #if UNIX
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| 32 | #define MSEC_PER_TICK 1000 /* Clock does 18.2 ticks per second. */
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| 33 | #define TICKS_PER_DAY 86400L /* Doesn't wrap, but that doesn't matter. */
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| 34 | #endif
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| 35 |
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| 36 | #define BOOTPOS 0x07C00L /* Bootstraps are loaded here. */
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| 37 | #define SIGNATURE 0xAA55 /* Proper bootstraps have this signature. */
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| 38 | #define SIGNATOFF 510 /* Offset within bootblock. */
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| 39 |
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| 40 | /* BIOS video modes. */
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| 41 | #define MONO_MODE 0x07 /* 80x25 monochrome. */
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| 42 | #define COLOR_MODE 0x03 /* 80x25 color. */
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| 43 |
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| 44 |
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| 45 | /* Variables shared with boothead.s: */
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| 46 | #ifndef EXTERN
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| 47 | #define EXTERN extern
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| 48 | #endif
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| 49 |
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| 50 | typedef struct vector { /* 8086 vector */
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| 51 | u16_t offset;
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| 52 | u16_t segment;
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| 53 | } vector;
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| 54 |
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| 55 | EXTERN vector rem_part; /* Boot partition table entry. */
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| 56 |
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| 57 | EXTERN u32_t caddr, daddr; /* Code and data address of the boot program. */
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| 58 | EXTERN u32_t runsize; /* Size of this program. */
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| 59 |
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| 60 | EXTERN u16_t device; /* Drive being booted from. */
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| 61 |
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| 62 | typedef struct { /* One chunk of free memory. */
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| 63 | u32_t base; /* Start byte. */
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| 64 | u32_t size; /* Number of bytes. */
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| 65 | } memory;
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| 66 |
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| 67 | EXTERN memory mem[3]; /* List of available memory. */
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| 68 | EXTERN int mon_return; /* Monitor stays in memory? */
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| 69 |
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| 70 | typedef struct bios_env
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| 71 | {
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| 72 | u16_t ax;
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| 73 | u16_t bx;
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| 74 | u16_t cx;
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| 75 | u16_t flags;
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| 76 | } bios_env_t;
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| 77 |
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| 78 | #define FL_CARRY 0x0001 /* carry flag */
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| 79 |
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| 80 | /* Functions defined by boothead.s: */
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| 81 |
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| 82 | void exit(int code);
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| 83 | /* Exit the monitor. */
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| 84 | u32_t mon2abs(void *ptr);
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| 85 | /* Local monitor address to absolute address. */
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| 86 | u32_t vec2abs(vector *vec);
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| 87 | /* Vector to absolute address. */
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| 88 | void raw_copy(u32_t dstaddr, u32_t srcaddr, u32_t count);
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| 89 | /* Copy bytes from anywhere to anywhere. */
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| 90 | u16_t get_word(u32_t addr);
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| 91 | /* Get a word from anywhere. */
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| 92 | void put_word(u32_t addr, U16_t word);
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| 93 | /* Put a word anywhere. */
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| 94 | void relocate(void);
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| 95 | /* Switch to a copy of this program. */
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| 96 | int dev_open(void), dev_close(void);
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| 97 | /* Open device and determine params / close device. */
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| 98 | int dev_boundary(u32_t sector);
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| 99 | /* True if sector is on a track boundary. */
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| 100 | int readsectors(u32_t bufaddr, u32_t sector, U8_t count);
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| 101 | /* Read 1 or more sectors from "device". */
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| 102 | int writesectors(u32_t bufaddr, u32_t sector, U8_t count);
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| 103 | /* Write 1 or more sectors to "device". */
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| 104 | int getch(void);
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| 105 | /* Read a keypress. */
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| 106 | void scan_keyboard(void);
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| 107 | /* Read keypress directly from kb controller. */
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| 108 | void ungetch(int c);
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| 109 | /* Undo a keypress. */
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| 110 | int escape(void);
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| 111 | /* True if escape typed. */
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| 112 | void putch(int c);
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| 113 | /* Send a character to the screen. */
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| 114 | #if BIOS
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| 115 | void pause(void);
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| 116 | /* Wait for an interrupt. */
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| 117 | void serial_init(int line);
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| 118 | #endif /* Enable copying console I/O to a serial line. */
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| 119 |
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| 120 | void set_mode(unsigned mode);
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| 121 | void clear_screen(void);
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| 122 | /* Set video mode / clear the screen. */
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| 123 |
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| 124 | u16_t get_bus(void);
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| 125 | /* System bus type, XT, AT, or MCA. */
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| 126 | u16_t get_video(void);
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| 127 | /* Display type, MDA to VGA. */
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| 128 | u32_t get_tick(void);
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| 129 | /* Current value of the clock tick counter. */
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| 130 |
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| 131 | void bootstrap(int device, struct part_entry *entry);
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| 132 | /* Execute a bootstrap routine for a different O.S. */
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| 133 | void minix(u32_t koff, u32_t kcs, u32_t kds,
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| 134 | char *bootparams, size_t paramsize, u32_t aout);
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| 135 | /* Start Minix. */
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| 136 | void int15(bios_env_t *);
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| 137 |
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| 138 |
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| 139 | /* Shared between boot.c and bootimage.c: */
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| 140 |
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| 141 | /* Sticky attributes. */
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| 142 | #define E_SPECIAL 0x01 /* These are known to the program. */
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| 143 | #define E_DEV 0x02 /* The value is a device name. */
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| 144 | #define E_RESERVED 0x04 /* May not be set by user, e.g. 'boot' */
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| 145 | #define E_STICKY 0x07 /* Don't go once set. */
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| 146 |
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| 147 | /* Volatile attributes. */
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| 148 | #define E_VAR 0x08 /* Variable */
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| 149 | #define E_FUNCTION 0x10 /* Function definition. */
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| 150 |
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| 151 | /* Variables, functions, and commands. */
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| 152 | typedef struct environment {
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| 153 | struct environment *next;
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| 154 | char flags;
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| 155 | char *name; /* name = value */
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| 156 | char *arg; /* name(arg) {value} */
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| 157 | char *value;
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| 158 | char *defval; /* Safehouse for default values. */
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| 159 | } environment;
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| 160 |
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| 161 | EXTERN environment *env; /* Lists the environment. */
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| 162 |
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| 163 | char *b_value(char *name); /* Get/set the value of a variable. */
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| 164 | int b_setvar(int flags, char *name, char *value);
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| 165 |
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| 166 | void parse_code(char *code); /* Parse boot monitor commands. */
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| 167 |
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| 168 | extern int fsok; /* True if the boot device contains an FS. */
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| 169 | EXTERN u32_t lowsec; /* Offset to the file system on the boot device. */
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| 170 |
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| 171 | /* Called by boot.c: */
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| 172 |
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| 173 | void bootminix(void); /* Load and start a Minix image. */
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| 174 |
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| 175 |
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| 176 | /* Called by bootimage.c: */
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| 177 |
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| 178 | void readerr(off_t sec, int err);
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| 179 | /* Report a read error. */
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| 180 | char *ul2a(u32_t n, unsigned b), *ul2a10(u32_t n);
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| 181 | /* Transform u32_t to ASCII at base b or base 10. */
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| 182 | long a2l(char *a);
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| 183 | /* Cheap atol(). */
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| 184 | unsigned a2x(char *a);
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| 185 | /* ASCII to hex. */
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| 186 | dev_t name2dev(char *name);
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| 187 | /* Translate a device name to a device number. */
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| 188 | int numprefix(char *s, char **ps);
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| 189 | /* True for a numeric prefix. */
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| 190 | int numeric(char *s);
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| 191 | /* True for a numeric string. */
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| 192 | char *unix_err(int err);
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| 193 | /* Give a descriptive text for some UNIX errors. */
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| 194 | int run_trailer(void);
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| 195 | /* Run the trailer function. */
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| 196 |
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| 197 | #if DOS
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| 198 | /* The monitor runs under MS-DOS. */
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| 199 | extern char PSP[256]; /* Program Segment Prefix. */
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| 200 | EXTERN char *vdisk; /* Name of the virtual disk. */
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| 201 | EXTERN char *drun; /* Initial command from DOS command line. */
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| 202 | #else
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| 203 | /* The monitor uses only the BIOS. */
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| 204 | #define DOS 0
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| 205 | #endif
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| 206 |
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| 207 | void readblock(off_t, char *, int);
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| 208 | void delay(char *);
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| 209 |
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| 210 | /*
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| 211 | * $PchId: boot.h,v 1.12 2002/02/27 19:42:45 philip Exp $
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| 212 | */
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