arch/x86/boot/boot.h

   1 /* -*- linux-c -*- ------------------------------------------------------- *
   2  *
   3  *   Copyright (C) 1991, 1992 Linus Torvalds
   4  *   Copyright 2007 rPath, Inc. - All Rights Reserved
   5  *   Copyright 2009 Intel Corporation; author H. Peter Anvin
   6  *
   7  *   This file is part of the Linux kernel, and is made available under
   8  *   the terms of the GNU General Public License version 2.
   9  *
  10  * ----------------------------------------------------------------------- */
  11
  12 /*
  13  * Header file for the real-mode kernel code
  14  */
  15
  16 #ifndef BOOT_BOOT_H
  17 #define BOOT_BOOT_H
  18
  19 #define STACK_SIZE      512     /* Minimum number of bytes for stack */
  20
  21 #ifndef __ASSEMBLY__
  22
  23 #include <stdarg.h>
  24 #include <linux/types.h>
  25 #include <linux/edd.h>
  26 #include <asm/boot.h>
  27 #include <asm/setup.h>
  28 #include "bitops.h"
  29 #include <asm/cpufeature.h>
  30 #include <asm/processor-flags.h>
  31 #include "ctype.h"
  32
  33 /* Useful macros */
  34 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  35
  36 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
  37
  38 extern struct setup_header hdr;
  39 extern struct boot_params boot_params;
  40
  41 #define cpu_relax()     asm volatile("rep; nop")
  42
  43 /* Basic port I/O */
  44 static inline void outb(u8 v, u16 port)
  45 {
  46         asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
  47 }
  48 static inline u8 inb(u16 port)
  49 {
  50         u8 v;
  51         asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
  52         return v;
  53 }
  54
  55 static inline void outw(u16 v, u16 port)
  56 {
  57         asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
  58 }
  59 static inline u16 inw(u16 port)
  60 {
  61         u16 v;
  62         asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
  63         return v;
  64 }
  65
  66 static inline void outl(u32 v, u16 port)
  67 {
  68         asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
  69 }
  70 static inline u32 inl(u16 port)
  71 {
  72         u32 v;
  73         asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
  74         return v;
  75 }
  76
  77 static inline void io_delay(void)
  78 {
  79         const u16 DELAY_PORT = 0x80;
  80         asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
  81 }
  82
  83 /* These functions are used to reference data in other segments. */
  84
  85 static inline u16 ds(void)
  86 {
  87         u16 seg;
  88         asm("movw %%ds,%0" : "=rm" (seg));
  89         return seg;
  90 }
  91
  92 static inline void set_fs(u16 seg)
  93 {
  94         asm volatile("movw %0,%%fs" : : "rm" (seg));
  95 }
  96 static inline u16 fs(void)
  97 {
  98         u16 seg;
  99         asm volatile("movw %%fs,%0" : "=rm" (seg));
 100         return seg;
 101 }
 102
 103 static inline void set_gs(u16 seg)
 104 {
 105         asm volatile("movw %0,%%gs" : : "rm" (seg));
 106 }
 107 static inline u16 gs(void)
 108 {
 109         u16 seg;
 110         asm volatile("movw %%gs,%0" : "=rm" (seg));
 111         return seg;
 112 }
 113
 114 typedef unsigned int addr_t;
 115
 116 static inline u8 rdfs8(addr_t addr)
 117 {
 118         u8 v;
 119         asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 120         return v;
 121 }
 122 static inline u16 rdfs16(addr_t addr)
 123 {
 124         u16 v;
 125         asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 126         return v;
 127 }
 128 static inline u32 rdfs32(addr_t addr)
 129 {
 130         u32 v;
 131         asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 132         return v;
 133 }
 134
 135 static inline void wrfs8(u8 v, addr_t addr)
 136 {
 137         asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 138 }
 139 static inline void wrfs16(u16 v, addr_t addr)
 140 {
 141         asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 142 }
 143 static inline void wrfs32(u32 v, addr_t addr)
 144 {
 145         asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 146 }
 147
 148 static inline u8 rdgs8(addr_t addr)
 149 {
 150         u8 v;
 151         asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 152         return v;
 153 }
 154 static inline u16 rdgs16(addr_t addr)
 155 {
 156         u16 v;
 157         asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 158         return v;
 159 }
 160 static inline u32 rdgs32(addr_t addr)
 161 {
 162         u32 v;
 163         asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 164         return v;
 165 }
 166
 167 static inline void wrgs8(u8 v, addr_t addr)
 168 {
 169         asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 170 }
 171 static inline void wrgs16(u16 v, addr_t addr)
 172 {
 173         asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 174 }
 175 static inline void wrgs32(u32 v, addr_t addr)
 176 {
 177         asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 178 }
 179
 180 /* Note: these only return true/false, not a signed return value! */
 181 static inline int memcmp(const void *s1, const void *s2, size_t len)
 182 {
 183         u8 diff;
 184         asm("repe; cmpsb; setnz %0"
 185             : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 186         return diff;
 187 }
 188
 189 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
 190 {
 191         u8 diff;
 192         asm volatile("fs; repe; cmpsb; setnz %0"
 193                      : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 194         return diff;
 195 }
 196 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
 197 {
 198         u8 diff;
 199         asm volatile("gs; repe; cmpsb; setnz %0"
 200                      : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 201         return diff;
 202 }
 203
 204 /* Heap -- available for dynamic lists. */
 205 extern char _end[];
 206 extern char *HEAP;
 207 extern char *heap_end;
 208 #define RESET_HEAP() ((void *)( HEAP = _end ))
 209 static inline char *__get_heap(size_t s, size_t a, size_t n)
 210 {
 211         char *tmp;
 212
 213         HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
 214         tmp = HEAP;
 215         HEAP += s*n;
 216         return tmp;
 217 }
 218 #define GET_HEAP(type, n) \
 219         ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
 220
 221 static inline bool heap_free(size_t n)
 222 {
 223         return (int)(heap_end-HEAP) >= (int)n;
 224 }
 225
 226 /* copy.S */
 227
 228 void copy_to_fs(addr_t dst, void *src, size_t len);
 229 void *copy_from_fs(void *dst, addr_t src, size_t len);
 230 void copy_to_gs(addr_t dst, void *src, size_t len);
 231 void *copy_from_gs(void *dst, addr_t src, size_t len);
 232 void *memcpy(void *dst, void *src, size_t len);
 233 void *memset(void *dst, int c, size_t len);
 234
 235 #define memcpy(d,s,l) __builtin_memcpy(d,s,l)
 236 #define memset(d,c,l) __builtin_memset(d,c,l)
 237
 238 /* a20.c */
 239 int enable_a20(void);
 240
 241 /* apm.c */
 242 int query_apm_bios(void);
 243
 244 /* bioscall.c */
 245 struct biosregs {
 246         union {
 247                 struct {
 248                         u32 edi;
 249                         u32 esi;
 250                         u32 ebp;
 251                         u32 _esp;
 252                         u32 ebx;
 253                         u32 edx;
 254                         u32 ecx;
 255                         u32 eax;
 256                         u32 _fsgs;
 257                         u32 _dses;
 258                         u32 eflags;
 259                 };
 260                 struct {
 261                         u16 di, hdi;
 262                         u16 si, hsi;
 263                         u16 bp, hbp;
 264                         u16 _sp, _hsp;
 265                         u16 bx, hbx;
 266                         u16 dx, hdx;
 267                         u16 cx, hcx;
 268                         u16 ax, hax;
 269                         u16 gs, fs;
 270                         u16 es, ds;
 271                         u16 flags, hflags;
 272                 };
 273                 struct {
 274                         u8 dil, dih, edi2, edi3;
 275                         u8 sil, sih, esi2, esi3;
 276                         u8 bpl, bph, ebp2, ebp3;
 277                         u8 _spl, _sph, _esp2, _esp3;
 278                         u8 bl, bh, ebx2, ebx3;
 279                         u8 dl, dh, edx2, edx3;
 280                         u8 cl, ch, ecx2, ecx3;
 281                         u8 al, ah, eax2, eax3;
 282                 };
 283         };
 284 };
 285 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
 286
 287 /* cmdline.c */
 288 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize);
 289 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option);
 290 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
 291 {
 292         unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
 293
 294         if (cmd_line_ptr >= 0x100000)
 295                 return -1;      /* inaccessible */
 296
 297         return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
 298 }
 299
 300 static inline int cmdline_find_option_bool(const char *option)
 301 {
 302         unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
 303
 304         if (cmd_line_ptr >= 0x100000)
 305                 return -1;      /* inaccessible */
 306
 307         return __cmdline_find_option_bool(cmd_line_ptr, option);
 308 }
 309
 310
 311 /* cpu.c, cpucheck.c */
 312 struct cpu_features {
 313         int level;              /* Family, or 64 for x86-64 */
 314         int model;
 315         u32 flags[NCAPINTS];
 316 };
 317 extern struct cpu_features cpu;
 318 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
 319 int validate_cpu(void);
 320
 321 /* early_serial_console.c */
 322 extern int early_serial_base;
 323 void console_init(void);
 324
 325 /* edd.c */
 326 void query_edd(void);
 327
 328 /* header.S */
 329 void __attribute__((noreturn)) die(void);
 330
 331 /* mca.c */
 332 int query_mca(void);
 333
 334 /* memory.c */
 335 int detect_memory(void);
 336
 337 /* pm.c */
 338 void __attribute__((noreturn)) go_to_protected_mode(void);
 339
 340 /* pmjump.S */
 341 void __attribute__((noreturn))
 342         protected_mode_jump(u32 entrypoint, u32 bootparams);
 343
 344 /* printf.c */
 345 int sprintf(char *buf, const char *fmt, ...);
 346 int vsprintf(char *buf, const char *fmt, va_list args);
 347 int printf(const char *fmt, ...);
 348
 349 /* regs.c */
 350 void initregs(struct biosregs *regs);
 351
 352 /* string.c */
 353 int strcmp(const char *str1, const char *str2);
 354 int strncmp(const char *cs, const char *ct, size_t count);
 355 size_t strnlen(const char *s, size_t maxlen);
 356 unsigned int atou(const char *s);
 357 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
 358 size_t strlen(const char *s);
 359
 360 /* tty.c */
 361 void puts(const char *);
 362 void putchar(int);
 363 int getchar(void);
 364 void kbd_flush(void);
 365 int getchar_timeout(void);
 366
 367 /* video.c */
 368 void set_video(void);
 369
 370 /* video-mode.c */
 371 int set_mode(u16 mode);
 372 int mode_defined(u16 mode);
 373 void probe_cards(int unsafe);
 374
 375 /* video-vesa.c */
 376 void vesa_store_edid(void);
 377
 378 #endif /* __ASSEMBLY__ */
 379
 380 #endif /* BOOT_BOOT_H */