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(const void *s1, const void *s2, size_t len) 181 { 182 u8 diff; 183 asm("repe; cmpsb; setnz %0" 184 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 185 return diff; 186 } 187 188 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) 189 { 190 u8 diff; 191 asm volatile("fs; repe; cmpsb; setnz %0" 192 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 193 return diff; 194 } 195 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) 196 { 197 u8 diff; 198 asm volatile("gs; repe; cmpsb; setnz %0" 199 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 200 return diff; 201 } 202 203 /* Heap -- available for dynamic lists. */ 204 extern char _end[]; 205 extern char *HEAP; 206 extern char *heap_end; 207 #define RESET_HEAP() ((void *)( HEAP = _end )) 208 static inline char *__get_heap(size_t s, size_t a, size_t n) 209 { 210 char *tmp; 211 212 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); 213 tmp = HEAP; 214 HEAP += s*n; 215 return tmp; 216 } 217 #define GET_HEAP(type, n) \ 218 ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) 219 220 static inline bool heap_free(size_t n) 221 { 222 return (int)(heap_end-HEAP) >= (int)n; 223 } 224 225 /* copy.S */ 226 227 void copy_to_fs(addr_t dst, void *src, size_t len); 228 void *copy_from_fs(void *dst, addr_t src, size_t len); 229 void copy_to_gs(addr_t dst, void *src, size_t len); 230 void *copy_from_gs(void *dst, addr_t src, size_t len); 231 void *memcpy(void *dst, void *src, size_t len); 232 void *memset(void *dst, int c, size_t len); 233 234 #define memcpy(d,s,l) __builtin_memcpy(d,s,l) 235 #define memset(d,c,l) __builtin_memset(d,c,l) 236 237 /* a20.c */ 238 int enable_a20(void); 239 240 /* apm.c */ 241 int query_apm_bios(void); 242 243 /* bioscall.c */ 244 struct biosregs { 245 union { 246 struct { 247 u32 edi; 248 u32 esi; 249 u32 ebp; 250 u32 _esp; 251 u32 ebx; 252 u32 edx; 253 u32 ecx; 254 u32 eax; 255 u32 _fsgs; 256 u32 _dses; 257 u32 eflags; 258 }; 259 struct { 260 u16 di, hdi; 261 u16 si, hsi; 262 u16 bp, hbp; 263 u16 _sp, _hsp; 264 u16 bx, hbx; 265 u16 dx, hdx; 266 u16 cx, hcx; 267 u16 ax, hax; 268 u16 gs, fs; 269 u16 es, ds; 270 u16 flags, hflags; 271 }; 272 struct { 273 u8 dil, dih, edi2, edi3; 274 u8 sil, sih, esi2, esi3; 275 u8 bpl, bph, ebp2, ebp3; 276 u8 _spl, _sph, _esp2, _esp3; 277 u8 bl, bh, ebx2, ebx3; 278 u8 dl, dh, edx2, edx3; 279 u8 cl, ch, ecx2, ecx3; 280 u8 al, ah, eax2, eax3; 281 }; 282 }; 283 }; 284 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 285 286 /* cmdline.c */ 287 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); 288 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); 289 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) 290 { 291 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 292 293 if (cmd_line_ptr >= 0x100000) 294 return -1; /* inaccessible */ 295 296 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); 297 } 298 299 static inline int cmdline_find_option_bool(const char *option) 300 { 301 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 302 303 if (cmd_line_ptr >= 0x100000) 304 return -1; /* inaccessible */ 305 306 return __cmdline_find_option_bool(cmd_line_ptr, option); 307 } 308 309 /* cpu.c, cpucheck.c */ 310 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 311 int validate_cpu(void); 312 313 /* early_serial_console.c */ 314 extern int early_serial_base; 315 void console_init(void); 316 317 /* edd.c */ 318 void query_edd(void); 319 320 /* header.S */ 321 void __attribute__((noreturn)) die(void); 322 323 /* mca.c */ 324 int query_mca(void); 325 326 /* memory.c */ 327 int detect_memory(void); 328 329 /* pm.c */ 330 void __attribute__((noreturn)) go_to_protected_mode(void); 331 332 /* pmjump.S */ 333 void __attribute__((noreturn)) 334 protected_mode_jump(u32 entrypoint, u32 bootparams); 335 336 /* printf.c */ 337 int sprintf(char *buf, const char *fmt, ...); 338 int vsprintf(char *buf, const char *fmt, va_list args); 339 int printf(const char *fmt, ...); 340 341 /* regs.c */ 342 void initregs(struct biosregs *regs); 343 344 /* string.c */ 345 int strcmp(const char *str1, const char *str2); 346 int strncmp(const char *cs, const char *ct, size_t count); 347 size_t strnlen(const char *s, size_t maxlen); 348 unsigned int atou(const char *s); 349 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); 350 size_t strlen(const char *s); 351 352 /* tty.c */ 353 void puts(const char *); 354 void putchar(int); 355 int getchar(void); 356 void kbd_flush(void); 357 int getchar_timeout(void); 358 359 /* video.c */ 360 void set_video(void); 361 362 /* video-mode.c */ 363 int set_mode(u16 mode); 364 int mode_defined(u16 mode); 365 void probe_cards(int unsafe); 366 367 /* video-vesa.c */ 368 void vesa_store_edid(void); 369 370 #endif /* __ASSEMBLY__ */ 371 372 #endif /* BOOT_BOOT_H */ 373