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