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  *
   6  *   This file is part of the Linux kernel, and is made available under
   7  *   the terms of the GNU General Public License version 2.
   8  *
   9  * ----------------------------------------------------------------------- */
  10
  11 /*
  12  * Header file for the real-mode kernel code
  13  */
  14
  15 #ifndef BOOT_BOOT_H
  16 #define BOOT_BOOT_H
  17
  18 #define STACK_SIZE      512     /* Minimum number of bytes for stack */
  19
  20 #ifndef __ASSEMBLY__
  21
  22 #include <stdarg.h>
  23 #include <linux/types.h>
  24 #include <linux/edd.h>
  25 #include <asm/boot.h>
  26 #include <asm/setup.h>
  27 #include "bitops.h"
  28 #include <asm/cpufeature.h>
  29
  30 /* Useful macros */
  31 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  32
  33 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
  34
  35 extern struct setup_header hdr;
  36 extern struct boot_params boot_params;
  37
  38 /* Basic port I/O */
  39 static inline void outb(u8 v, u16 port)
  40 {
  41         asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
  42 }
  43 static inline u8 inb(u16 port)
  44 {
  45         u8 v;
  46         asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
  47         return v;
  48 }
  49
  50 static inline void outw(u16 v, u16 port)
  51 {
  52         asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
  53 }
  54 static inline u16 inw(u16 port)
  55 {
  56         u16 v;
  57         asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
  58         return v;
  59 }
  60
  61 static inline void outl(u32 v, u16 port)
  62 {
  63         asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
  64 }
  65 static inline u32 inl(u32 port)
  66 {
  67         u32 v;
  68         asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
  69         return v;
  70 }
  71
  72 static inline void io_delay(void)
  73 {
  74         const u16 DELAY_PORT = 0x80;
  75         asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
  76 }
  77
  78 /* These functions are used to reference data in other segments. */
  79
  80 static inline u16 ds(void)
  81 {
  82         u16 seg;
  83         asm("movw %%ds,%0" : "=rm" (seg));
  84         return seg;
  85 }
  86
  87 static inline void set_fs(u16 seg)
  88 {
  89         asm volatile("movw %0,%%fs" : : "rm" (seg));
  90 }
  91 static inline u16 fs(void)
  92 {
  93         u16 seg;
  94         asm volatile("movw %%fs,%0" : "=rm" (seg));
  95         return seg;
  96 }
  97
  98 static inline void set_gs(u16 seg)
  99 {
 100         asm volatile("movw %0,%%gs" : : "rm" (seg));
 101 }
 102 static inline u16 gs(void)
 103 {
 104         u16 seg;
 105         asm volatile("movw %%gs,%0" : "=rm" (seg));
 106         return seg;
 107 }
 108
 109 typedef unsigned int addr_t;
 110
 111 static inline u8 rdfs8(addr_t addr)
 112 {
 113         u8 v;
 114         asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 115         return v;
 116 }
 117 static inline u16 rdfs16(addr_t addr)
 118 {
 119         u16 v;
 120         asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 121         return v;
 122 }
 123 static inline u32 rdfs32(addr_t addr)
 124 {
 125         u32 v;
 126         asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 127         return v;
 128 }
 129
 130 static inline void wrfs8(u8 v, addr_t addr)
 131 {
 132         asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 133 }
 134 static inline void wrfs16(u16 v, addr_t addr)
 135 {
 136         asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 137 }
 138 static inline void wrfs32(u32 v, addr_t addr)
 139 {
 140         asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 141 }
 142
 143 static inline u8 rdgs8(addr_t addr)
 144 {
 145         u8 v;
 146         asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 147         return v;
 148 }
 149 static inline u16 rdgs16(addr_t addr)
 150 {
 151         u16 v;
 152         asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 153         return v;
 154 }
 155 static inline u32 rdgs32(addr_t addr)
 156 {
 157         u32 v;
 158         asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 159         return v;
 160 }
 161
 162 static inline void wrgs8(u8 v, addr_t addr)
 163 {
 164         asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 165 }
 166 static inline void wrgs16(u16 v, addr_t addr)
 167 {
 168         asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 169 }
 170 static inline void wrgs32(u32 v, addr_t addr)
 171 {
 172         asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 173 }
 174
 175 /* Note: these only return true/false, not a signed return value! */
 176 static inline int memcmp(const void *s1, const void *s2, size_t len)
 177 {
 178         u8 diff;
 179         asm("repe; cmpsb; setnz %0"
 180             : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 181         return diff;
 182 }
 183
 184 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
 185 {
 186         u8 diff;
 187         asm volatile("fs; repe; cmpsb; setnz %0"
 188                      : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 189         return diff;
 190 }
 191 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
 192 {
 193         u8 diff;
 194         asm volatile("gs; repe; cmpsb; setnz %0"
 195                      : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 196         return diff;
 197 }
 198
 199 static inline int isdigit(int ch)
 200 {
 201         return (ch >= '0') && (ch <= '9');
 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 /* cmdline.c */
 245 int cmdline_find_option(const char *option, char *buffer, int bufsize);
 246 int cmdline_find_option_bool(const char *option);
 247
 248 /* cpu.c, cpucheck.c */
 249 struct cpu_features {
 250         int level;              /* Family, or 64 for x86-64 */
 251         int model;
 252         u32 flags[NCAPINTS];
 253 };
 254 extern struct cpu_features cpu;
 255 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
 256 int validate_cpu(void);
 257
 258 /* edd.c */
 259 void query_edd(void);
 260
 261 /* header.S */
 262 void __attribute__((noreturn)) die(void);
 263
 264 /* mca.c */
 265 int query_mca(void);
 266
 267 /* memory.c */
 268 int detect_memory(void);
 269
 270 /* pm.c */
 271 void __attribute__((noreturn)) go_to_protected_mode(void);
 272
 273 /* pmjump.S */
 274 void __attribute__((noreturn))
 275         protected_mode_jump(u32 entrypoint, u32 bootparams);
 276
 277 /* printf.c */
 278 int sprintf(char *buf, const char *fmt, ...);
 279 int vsprintf(char *buf, const char *fmt, va_list args);
 280 int printf(const char *fmt, ...);
 281
 282 /* string.c */
 283 int strcmp(const char *str1, const char *str2);
 284 size_t strnlen(const char *s, size_t maxlen);
 285 unsigned int atou(const char *s);
 286
 287 /* tty.c */
 288 void puts(const char *);
 289 void putchar(int);
 290 int getchar(void);
 291 void kbd_flush(void);
 292 int getchar_timeout(void);
 293
 294 /* video.c */
 295 void set_video(void);
 296
 297 /* video-mode.c */
 298 int set_mode(u16 mode);
 299 int mode_defined(u16 mode);
 300 void probe_cards(int unsafe);
 301
 302 /* video-vesa.c */
 303 void vesa_store_edid(void);
 304
 305 /* voyager.c */
 306 int query_voyager(void);
 307
 308 #endif /* __ASSEMBLY__ */
 309
 310 #endif /* BOOT_BOOT_H */