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