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
  28 /* Useful macros */
  29 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  30
  31 extern struct setup_header hdr;
  32 extern struct boot_params boot_params;
  33
  34 /* Basic port I/O */
  35 static inline void outb(u8 v, u16 port)
  36 {
  37         asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
  38 }
  39 static inline u8 inb(u16 port)
  40 {
  41         u8 v;
  42         asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
  43         return v;
  44 }
  45
  46 static inline void outw(u16 v, u16 port)
  47 {
  48         asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
  49 }
  50 static inline u16 inw(u16 port)
  51 {
  52         u16 v;
  53         asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
  54         return v;
  55 }
  56
  57 static inline void outl(u32 v, u16 port)
  58 {
  59         asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
  60 }
  61 static inline u32 inl(u32 port)
  62 {
  63         u32 v;
  64         asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
  65         return v;
  66 }
  67
  68 static inline void io_delay(void)
  69 {
  70         const u16 DELAY_PORT = 0x80;
  71         asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
  72 }
  73
  74 /* These functions are used to reference data in other segments. */
  75
  76 static inline u16 ds(void)
  77 {
  78         u16 seg;
  79         asm("movw %%ds,%0" : "=rm" (seg));
  80         return seg;
  81 }
  82
  83 static inline void set_fs(u16 seg)
  84 {
  85         asm volatile("movw %0,%%fs" : : "rm" (seg));
  86 }
  87 static inline u16 fs(void)
  88 {
  89         u16 seg;
  90         asm volatile("movw %%fs,%0" : "=rm" (seg));
  91         return seg;
  92 }
  93
  94 static inline void set_gs(u16 seg)
  95 {
  96         asm volatile("movw %0,%%gs" : : "rm" (seg));
  97 }
  98 static inline u16 gs(void)
  99 {
 100         u16 seg;
 101         asm volatile("movw %%gs,%0" : "=rm" (seg));
 102         return seg;
 103 }
 104
 105 typedef unsigned int addr_t;
 106
 107 static inline u8 rdfs8(addr_t addr)
 108 {
 109         u8 v;
 110         asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 111         return v;
 112 }
 113 static inline u16 rdfs16(addr_t addr)
 114 {
 115         u16 v;
 116         asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 117         return v;
 118 }
 119 static inline u32 rdfs32(addr_t addr)
 120 {
 121         u32 v;
 122         asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 123         return v;
 124 }
 125
 126 static inline void wrfs8(u8 v, addr_t addr)
 127 {
 128         asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 129 }
 130 static inline void wrfs16(u16 v, addr_t addr)
 131 {
 132         asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 133 }
 134 static inline void wrfs32(u32 v, addr_t addr)
 135 {
 136         asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 137 }
 138
 139 static inline u8 rdgs8(addr_t addr)
 140 {
 141         u8 v;
 142         asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 143         return v;
 144 }
 145 static inline u16 rdgs16(addr_t addr)
 146 {
 147         u16 v;
 148         asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 149         return v;
 150 }
 151 static inline u32 rdgs32(addr_t addr)
 152 {
 153         u32 v;
 154         asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 155         return v;
 156 }
 157
 158 static inline void wrgs8(u8 v, addr_t addr)
 159 {
 160         asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 161 }
 162 static inline void wrgs16(u16 v, addr_t addr)
 163 {
 164         asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 165 }
 166 static inline void wrgs32(u32 v, addr_t addr)
 167 {
 168         asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 169 }
 170
 171 /* Note: these only return true/false, not a signed return value! */
 172 static inline int memcmp(const void *s1, const void *s2, size_t len)
 173 {
 174         u8 diff;
 175         asm("repe; cmpsb; setnz %0"
 176             : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 177         return diff;
 178 }
 179
 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 static inline int isdigit(int ch)
 196 {
 197         return (ch >= '0') && (ch <= '9');
 198 }
 199
 200 /* Heap -- available for dynamic lists. */
 201 extern char _end[];
 202 extern char *HEAP;
 203 extern char *heap_end;
 204 #define RESET_HEAP() ((void *)( HEAP = _end ))
 205 static inline char *__get_heap(size_t s, size_t a, size_t n)
 206 {
 207         char *tmp;
 208
 209         HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
 210         tmp = HEAP;
 211         HEAP += s*n;
 212         return tmp;
 213 }
 214 #define GET_HEAP(type, n) \
 215         ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
 216
 217 static inline bool heap_free(size_t n)
 218 {
 219         return (int)(heap_end-HEAP) >= (int)n;
 220 }
 221
 222 /* copy.S */
 223
 224 void copy_to_fs(addr_t dst, void *src, size_t len);
 225 void *copy_from_fs(void *dst, addr_t src, size_t len);
 226 void copy_to_gs(addr_t dst, void *src, size_t len);
 227 void *copy_from_gs(void *dst, addr_t src, size_t len);
 228 void *memcpy(void *dst, void *src, size_t len);
 229 void *memset(void *dst, int c, size_t len);
 230
 231 #define memcpy(d,s,l) __builtin_memcpy(d,s,l)
 232 #define memset(d,c,l) __builtin_memset(d,c,l)
 233
 234 /* a20.c */
 235 int enable_a20(void);
 236
 237 /* apm.c */
 238 int query_apm_bios(void);
 239
 240 /* cmdline.c */
 241 int cmdline_find_option(const char *option, char *buffer, int bufsize);
 242 int cmdline_find_option_bool(const char *option);
 243
 244 /* cpu.c, cpucheck.c */
 245 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
 246 int validate_cpu(void);
 247
 248 /* edd.c */
 249 void query_edd(void);
 250
 251 /* header.S */
 252 void __attribute__((noreturn)) die(void);
 253
 254 /* mca.c */
 255 int query_mca(void);
 256
 257 /* memory.c */
 258 int detect_memory(void);
 259
 260 /* pm.c */
 261 void __attribute__((noreturn)) go_to_protected_mode(void);
 262
 263 /* pmjump.S */
 264 void __attribute__((noreturn))
 265         protected_mode_jump(u32 entrypoint, u32 bootparams);
 266
 267 /* printf.c */
 268 int sprintf(char *buf, const char *fmt, ...);
 269 int vsprintf(char *buf, const char *fmt, va_list args);
 270 int printf(const char *fmt, ...);
 271
 272 /* string.c */
 273 int strcmp(const char *str1, const char *str2);
 274 size_t strnlen(const char *s, size_t maxlen);
 275 unsigned int atou(const char *s);
 276
 277 /* tty.c */
 278 void puts(const char *);
 279 void putchar(int);
 280 int getchar(void);
 281 void kbd_flush(void);
 282 int getchar_timeout(void);
 283
 284 /* video.c */
 285 void set_video(void);
 286
 287 /* video-mode.c */
 288 int set_mode(u16 mode);
 289 int mode_defined(u16 mode);
 290 void probe_cards(int unsafe);
 291
 292 /* video-vesa.c */
 293 void vesa_store_edid(void);
 294
 295 /* voyager.c */
 296 int query_voyager(void);
 297
 298 #endif /* __ASSEMBLY__ */
 299
 300 #endif /* BOOT_BOOT_H */