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