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  * arch/i386/boot/boot.h
  13  *
  14  * Header file for the real-mode kernel code
  15  */
  16
  17 #ifndef BOOT_BOOT_H
  18 #define BOOT_BOOT_H
  19
  20 #define STACK_SIZE      512     /* Minimum number of bytes for stack */
  21
  22 #ifndef __ASSEMBLY__
  23
  24 #include <stdarg.h>
  25 #include <linux/types.h>
  26 #include <linux/edd.h>
  27 #include <asm/boot.h>
  28 #include <asm/setup.h>
  29
  30 /* Useful macros */
  31 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  32
  33 extern struct setup_header hdr;
  34 extern struct boot_params boot_params;
  35
  36 /* Basic port I/O */
  37 static inline void outb(u8 v, u16 port)
  38 {
  39         asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
  40 }
  41 static inline u8 inb(u16 port)
  42 {
  43         u8 v;
  44         asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
  45         return v;
  46 }
  47
  48 static inline void outw(u16 v, u16 port)
  49 {
  50         asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
  51 }
  52 static inline u16 inw(u16 port)
  53 {
  54         u16 v;
  55         asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
  56         return v;
  57 }
  58
  59 static inline void outl(u32 v, u16 port)
  60 {
  61         asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
  62 }
  63 static inline u32 inl(u32 port)
  64 {
  65         u32 v;
  66         asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
  67         return v;
  68 }
  69
  70 static inline void io_delay(void)
  71 {
  72         const u16 DELAY_PORT = 0x80;
  73         asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
  74 }
  75
  76 /* These functions are used to reference data in other segments. */
  77
  78 static inline u16 ds(void)
  79 {
  80         u16 seg;
  81         asm("movw %%ds,%0" : "=rm" (seg));
  82         return seg;
  83 }
  84
  85 static inline void set_fs(u16 seg)
  86 {
  87         asm volatile("movw %0,%%fs" : : "rm" (seg));
  88 }
  89 static inline u16 fs(void)
  90 {
  91         u16 seg;
  92         asm volatile("movw %%fs,%0" : "=rm" (seg));
  93         return seg;
  94 }
  95
  96 static inline void set_gs(u16 seg)
  97 {
  98         asm volatile("movw %0,%%gs" : : "rm" (seg));
  99 }
 100 static inline u16 gs(void)
 101 {
 102         u16 seg;
 103         asm volatile("movw %%gs,%0" : "=rm" (seg));
 104         return seg;
 105 }
 106
 107 typedef unsigned int addr_t;
 108
 109 static inline u8 rdfs8(addr_t addr)
 110 {
 111         u8 v;
 112         asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 113         return v;
 114 }
 115 static inline u16 rdfs16(addr_t addr)
 116 {
 117         u16 v;
 118         asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 119         return v;
 120 }
 121 static inline u32 rdfs32(addr_t addr)
 122 {
 123         u32 v;
 124         asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 125         return v;
 126 }
 127
 128 static inline void wrfs8(u8 v, addr_t addr)
 129 {
 130         asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 131 }
 132 static inline void wrfs16(u16 v, addr_t addr)
 133 {
 134         asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 135 }
 136 static inline void wrfs32(u32 v, addr_t addr)
 137 {
 138         asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 139 }
 140
 141 static inline u8 rdgs8(addr_t addr)
 142 {
 143         u8 v;
 144         asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 145         return v;
 146 }
 147 static inline u16 rdgs16(addr_t addr)
 148 {
 149         u16 v;
 150         asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 151         return v;
 152 }
 153 static inline u32 rdgs32(addr_t addr)
 154 {
 155         u32 v;
 156         asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 157         return v;
 158 }
 159
 160 static inline void wrgs8(u8 v, addr_t addr)
 161 {
 162         asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 163 }
 164 static inline void wrgs16(u16 v, addr_t addr)
 165 {
 166         asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 167 }
 168 static inline void wrgs32(u32 v, addr_t addr)
 169 {
 170         asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 171 }
 172
 173 /* Note: these only return true/false, not a signed return value! */
 174 static inline int memcmp(const void *s1, const void *s2, size_t len)
 175 {
 176         u8 diff;
 177         asm("repe; cmpsb; setnz %0"
 178             : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 179         return diff;
 180 }
 181
 182 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
 183 {
 184         u8 diff;
 185         asm volatile("fs; repe; cmpsb; setnz %0"
 186                      : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 187         return diff;
 188 }
 189 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
 190 {
 191         u8 diff;
 192         asm volatile("gs; repe; cmpsb; setnz %0"
 193                      : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
 194         return diff;
 195 }
 196
 197 static inline int isdigit(int ch)
 198 {
 199         return (ch >= '0') && (ch <= '9');
 200 }
 201
 202 /* Heap -- available for dynamic lists. */
 203 extern char _end[];
 204 extern char *HEAP;
 205 extern char *heap_end;
 206 #define RESET_HEAP() ((void *)( HEAP = _end ))
 207 static inline char *__get_heap(size_t s, size_t a, size_t n)
 208 {
 209         char *tmp;
 210
 211         HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
 212         tmp = HEAP;
 213         HEAP += s*n;
 214         return tmp;
 215 }
 216 #define GET_HEAP(type, n) \
 217         ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
 218
 219 static inline bool heap_free(size_t n)
 220 {
 221         return (int)(heap_end-HEAP) >= (int)n;
 222 }
 223
 224 /* copy.S */
 225
 226 void copy_to_fs(addr_t dst, void *src, size_t len);
 227 void *copy_from_fs(void *dst, addr_t src, size_t len);
 228 void copy_to_gs(addr_t dst, void *src, size_t len);
 229 void *copy_from_gs(void *dst, addr_t src, size_t len);
 230 void *memcpy(void *dst, void *src, size_t len);
 231 void *memset(void *dst, int c, size_t len);
 232
 233 #define memcpy(d,s,l) __builtin_memcpy(d,s,l)
 234 #define memset(d,c,l) __builtin_memset(d,c,l)
 235
 236 /* a20.c */
 237 int enable_a20(void);
 238
 239 /* apm.c */
 240 int query_apm_bios(void);
 241
 242 /* cmdline.c */
 243 int cmdline_find_option(const char *option, char *buffer, int bufsize);
 244 int cmdline_find_option_bool(const char *option);
 245
 246 /* cpu.c, cpucheck.c */
 247 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
 248 int validate_cpu(void);
 249
 250 /* edd.c */
 251 void query_edd(void);
 252
 253 /* header.S */
 254 void __attribute__((noreturn)) die(void);
 255
 256 /* mca.c */
 257 int query_mca(void);
 258
 259 /* memory.c */
 260 int detect_memory(void);
 261
 262 /* pm.c */
 263 void __attribute__((noreturn)) go_to_protected_mode(void);
 264
 265 /* pmjump.S */
 266 void __attribute__((noreturn))
 267         protected_mode_jump(u32 entrypoint, u32 bootparams);
 268
 269 /* printf.c */
 270 int sprintf(char *buf, const char *fmt, ...);
 271 int vsprintf(char *buf, const char *fmt, va_list args);
 272 int printf(const char *fmt, ...);
 273
 274 /* string.c */
 275 int strcmp(const char *str1, const char *str2);
 276 size_t strnlen(const char *s, size_t maxlen);
 277 unsigned int atou(const char *s);
 278
 279 /* tty.c */
 280 void puts(const char *);
 281 void putchar(int);
 282 int getchar(void);
 283 void kbd_flush(void);
 284 int getchar_timeout(void);
 285
 286 /* video.c */
 287 void set_video(void);
 288
 289 /* video-vesa.c */
 290 void vesa_store_edid(void);
 291
 292 /* voyager.c */
 293 int query_voyager(void);
 294
 295 #endif /* __ASSEMBLY__ */
 296
 297 #endif /* BOOT_BOOT_H */