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 <asm/cpufeature.h> 30 #include <asm/processor-flags.h> 31 #include "ctype.h" 32 33 /* Useful macros */ 34 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 35 36 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) 37 38 extern struct setup_header hdr; 39 extern struct boot_params boot_params; 40 41 #define cpu_relax() asm volatile("rep; nop") 42 43 /* Basic port I/O */ 44 static inline void outb(u8 v, u16 port) 45 { 46 asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); 47 } 48 static inline u8 inb(u16 port) 49 { 50 u8 v; 51 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); 52 return v; 53 } 54 55 static inline void outw(u16 v, u16 port) 56 { 57 asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); 58 } 59 static inline u16 inw(u16 port) 60 { 61 u16 v; 62 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); 63 return v; 64 } 65 66 static inline void outl(u32 v, u16 port) 67 { 68 asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); 69 } 70 static inline u32 inl(u16 port) 71 { 72 u32 v; 73 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); 74 return v; 75 } 76 77 static inline void io_delay(void) 78 { 79 const u16 DELAY_PORT = 0x80; 80 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); 81 } 82 83 /* These functions are used to reference data in other segments. */ 84 85 static inline u16 ds(void) 86 { 87 u16 seg; 88 asm("movw %%ds,%0" : "=rm" (seg)); 89 return seg; 90 } 91 92 static inline void set_fs(u16 seg) 93 { 94 asm volatile("movw %0,%%fs" : : "rm" (seg)); 95 } 96 static inline u16 fs(void) 97 { 98 u16 seg; 99 asm volatile("movw %%fs,%0" : "=rm" (seg)); 100 return seg; 101 } 102 103 static inline void set_gs(u16 seg) 104 { 105 asm volatile("movw %0,%%gs" : : "rm" (seg)); 106 } 107 static inline u16 gs(void) 108 { 109 u16 seg; 110 asm volatile("movw %%gs,%0" : "=rm" (seg)); 111 return seg; 112 } 113 114 typedef unsigned int addr_t; 115 116 static inline u8 rdfs8(addr_t addr) 117 { 118 u8 v; 119 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); 120 return v; 121 } 122 static inline u16 rdfs16(addr_t addr) 123 { 124 u16 v; 125 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 126 return v; 127 } 128 static inline u32 rdfs32(addr_t addr) 129 { 130 u32 v; 131 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 132 return v; 133 } 134 135 static inline void wrfs8(u8 v, addr_t addr) 136 { 137 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 138 } 139 static inline void wrfs16(u16 v, addr_t addr) 140 { 141 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 142 } 143 static inline void wrfs32(u32 v, addr_t addr) 144 { 145 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 146 } 147 148 static inline u8 rdgs8(addr_t addr) 149 { 150 u8 v; 151 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); 152 return v; 153 } 154 static inline u16 rdgs16(addr_t addr) 155 { 156 u16 v; 157 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 158 return v; 159 } 160 static inline u32 rdgs32(addr_t addr) 161 { 162 u32 v; 163 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 164 return v; 165 } 166 167 static inline void wrgs8(u8 v, addr_t addr) 168 { 169 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 170 } 171 static inline void wrgs16(u16 v, addr_t addr) 172 { 173 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 174 } 175 static inline void wrgs32(u32 v, addr_t addr) 176 { 177 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 178 } 179 180 /* Note: these only return true/false, not a signed return value! */ 181 static inline int memcmp(const void *s1, const void *s2, size_t len) 182 { 183 u8 diff; 184 asm("repe; cmpsb; setnz %0" 185 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 186 return diff; 187 } 188 189 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) 190 { 191 u8 diff; 192 asm volatile("fs; repe; cmpsb; setnz %0" 193 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 194 return diff; 195 } 196 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) 197 { 198 u8 diff; 199 asm volatile("gs; repe; cmpsb; setnz %0" 200 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 201 return diff; 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 /* bioscall.c */ 245 struct biosregs { 246 union { 247 struct { 248 u32 edi; 249 u32 esi; 250 u32 ebp; 251 u32 _esp; 252 u32 ebx; 253 u32 edx; 254 u32 ecx; 255 u32 eax; 256 u32 _fsgs; 257 u32 _dses; 258 u32 eflags; 259 }; 260 struct { 261 u16 di, hdi; 262 u16 si, hsi; 263 u16 bp, hbp; 264 u16 _sp, _hsp; 265 u16 bx, hbx; 266 u16 dx, hdx; 267 u16 cx, hcx; 268 u16 ax, hax; 269 u16 gs, fs; 270 u16 es, ds; 271 u16 flags, hflags; 272 }; 273 struct { 274 u8 dil, dih, edi2, edi3; 275 u8 sil, sih, esi2, esi3; 276 u8 bpl, bph, ebp2, ebp3; 277 u8 _spl, _sph, _esp2, _esp3; 278 u8 bl, bh, ebx2, ebx3; 279 u8 dl, dh, edx2, edx3; 280 u8 cl, ch, ecx2, ecx3; 281 u8 al, ah, eax2, eax3; 282 }; 283 }; 284 }; 285 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 286 287 /* cmdline.c */ 288 int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int bufsize); 289 int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option); 290 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) 291 { 292 return __cmdline_find_option(boot_params.hdr.cmd_line_ptr, option, buffer, bufsize); 293 } 294 295 static inline int cmdline_find_option_bool(const char *option) 296 { 297 return __cmdline_find_option_bool(boot_params.hdr.cmd_line_ptr, option); 298 } 299 300 301 /* cpu.c, cpucheck.c */ 302 struct cpu_features { 303 int level; /* Family, or 64 for x86-64 */ 304 int model; 305 u32 flags[NCAPINTS]; 306 }; 307 extern struct cpu_features cpu; 308 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 309 int validate_cpu(void); 310 311 /* early_serial_console.c */ 312 extern int early_serial_base; 313 void console_init(void); 314 315 /* edd.c */ 316 void query_edd(void); 317 318 /* header.S */ 319 void __attribute__((noreturn)) die(void); 320 321 /* mca.c */ 322 int query_mca(void); 323 324 /* memory.c */ 325 int detect_memory(void); 326 327 /* pm.c */ 328 void __attribute__((noreturn)) go_to_protected_mode(void); 329 330 /* pmjump.S */ 331 void __attribute__((noreturn)) 332 protected_mode_jump(u32 entrypoint, u32 bootparams); 333 334 /* printf.c */ 335 int sprintf(char *buf, const char *fmt, ...); 336 int vsprintf(char *buf, const char *fmt, va_list args); 337 int printf(const char *fmt, ...); 338 339 /* regs.c */ 340 void initregs(struct biosregs *regs); 341 342 /* string.c */ 343 int strcmp(const char *str1, const char *str2); 344 int strncmp(const char *cs, const char *ct, size_t count); 345 size_t strnlen(const char *s, size_t maxlen); 346 unsigned int atou(const char *s); 347 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); 348 349 /* tty.c */ 350 void puts(const char *); 351 void putchar(int); 352 int getchar(void); 353 void kbd_flush(void); 354 int getchar_timeout(void); 355 356 /* video.c */ 357 void set_video(void); 358 359 /* video-mode.c */ 360 int set_mode(u16 mode); 361 int mode_defined(u16 mode); 362 void probe_cards(int unsafe); 363 364 /* video-vesa.c */ 365 void vesa_store_edid(void); 366 367 #endif /* __ASSEMBLY__ */ 368 369 #endif /* BOOT_BOOT_H */ 370