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/setup.h> 27 #include "bitops.h" 28 #include "ctype.h" 29 #include "cpuflags.h" 30 31 /* Useful macros */ 32 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 33 34 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) 35 36 extern struct setup_header hdr; 37 extern struct boot_params boot_params; 38 39 #define cpu_relax() asm volatile("rep; nop") 40 41 /* Basic port I/O */ 42 static inline void outb(u8 v, u16 port) 43 { 44 asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); 45 } 46 static inline u8 inb(u16 port) 47 { 48 u8 v; 49 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); 50 return v; 51 } 52 53 static inline void outw(u16 v, u16 port) 54 { 55 asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); 56 } 57 static inline u16 inw(u16 port) 58 { 59 u16 v; 60 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); 61 return v; 62 } 63 64 static inline void outl(u32 v, u16 port) 65 { 66 asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); 67 } 68 static inline u32 inl(u16 port) 69 { 70 u32 v; 71 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); 72 return v; 73 } 74 75 static inline void io_delay(void) 76 { 77 const u16 DELAY_PORT = 0x80; 78 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); 79 } 80 81 /* These functions are used to reference data in other segments. */ 82 83 static inline u16 ds(void) 84 { 85 u16 seg; 86 asm("movw %%ds,%0" : "=rm" (seg)); 87 return seg; 88 } 89 90 static inline void set_fs(u16 seg) 91 { 92 asm volatile("movw %0,%%fs" : : "rm" (seg)); 93 } 94 static inline u16 fs(void) 95 { 96 u16 seg; 97 asm volatile("movw %%fs,%0" : "=rm" (seg)); 98 return seg; 99 } 100 101 static inline void set_gs(u16 seg) 102 { 103 asm volatile("movw %0,%%gs" : : "rm" (seg)); 104 } 105 static inline u16 gs(void) 106 { 107 u16 seg; 108 asm volatile("movw %%gs,%0" : "=rm" (seg)); 109 return seg; 110 } 111 112 typedef unsigned int addr_t; 113 114 static inline u8 rdfs8(addr_t addr) 115 { 116 u8 v; 117 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); 118 return v; 119 } 120 static inline u16 rdfs16(addr_t addr) 121 { 122 u16 v; 123 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 124 return v; 125 } 126 static inline u32 rdfs32(addr_t addr) 127 { 128 u32 v; 129 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 130 return v; 131 } 132 133 static inline void wrfs8(u8 v, addr_t addr) 134 { 135 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 136 } 137 static inline void wrfs16(u16 v, addr_t addr) 138 { 139 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 140 } 141 static inline void wrfs32(u32 v, addr_t addr) 142 { 143 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 144 } 145 146 static inline u8 rdgs8(addr_t addr) 147 { 148 u8 v; 149 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); 150 return v; 151 } 152 static inline u16 rdgs16(addr_t addr) 153 { 154 u16 v; 155 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 156 return v; 157 } 158 static inline u32 rdgs32(addr_t addr) 159 { 160 u32 v; 161 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 162 return v; 163 } 164 165 static inline void wrgs8(u8 v, addr_t addr) 166 { 167 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 168 } 169 static inline void wrgs16(u16 v, addr_t addr) 170 { 171 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 172 } 173 static inline void wrgs32(u32 v, addr_t addr) 174 { 175 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 176 } 177 178 /* Note: these only return true/false, not a signed return value! */ 179 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) 180 { 181 u8 diff; 182 asm volatile("fs; repe; cmpsb; setnz %0" 183 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 184 return diff; 185 } 186 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) 187 { 188 u8 diff; 189 asm volatile("gs; repe; cmpsb; setnz %0" 190 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 191 return diff; 192 } 193 194 /* Heap -- available for dynamic lists. */ 195 extern char _end[]; 196 extern char *HEAP; 197 extern char *heap_end; 198 #define RESET_HEAP() ((void *)( HEAP = _end )) 199 static inline char *__get_heap(size_t s, size_t a, size_t n) 200 { 201 char *tmp; 202 203 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); 204 tmp = HEAP; 205 HEAP += s*n; 206 return tmp; 207 } 208 #define GET_HEAP(type, n) \ 209 ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) 210 211 static inline bool heap_free(size_t n) 212 { 213 return (int)(heap_end-HEAP) >= (int)n; 214 } 215 216 /* copy.S */ 217 218 void copy_to_fs(addr_t dst, void *src, size_t len); 219 void *copy_from_fs(void *dst, addr_t src, size_t len); 220 void copy_to_gs(addr_t dst, void *src, size_t len); 221 void *copy_from_gs(void *dst, addr_t src, size_t len); 222 223 /* a20.c */ 224 int enable_a20(void); 225 226 /* apm.c */ 227 int query_apm_bios(void); 228 229 /* bioscall.c */ 230 struct biosregs { 231 union { 232 struct { 233 u32 edi; 234 u32 esi; 235 u32 ebp; 236 u32 _esp; 237 u32 ebx; 238 u32 edx; 239 u32 ecx; 240 u32 eax; 241 u32 _fsgs; 242 u32 _dses; 243 u32 eflags; 244 }; 245 struct { 246 u16 di, hdi; 247 u16 si, hsi; 248 u16 bp, hbp; 249 u16 _sp, _hsp; 250 u16 bx, hbx; 251 u16 dx, hdx; 252 u16 cx, hcx; 253 u16 ax, hax; 254 u16 gs, fs; 255 u16 es, ds; 256 u16 flags, hflags; 257 }; 258 struct { 259 u8 dil, dih, edi2, edi3; 260 u8 sil, sih, esi2, esi3; 261 u8 bpl, bph, ebp2, ebp3; 262 u8 _spl, _sph, _esp2, _esp3; 263 u8 bl, bh, ebx2, ebx3; 264 u8 dl, dh, edx2, edx3; 265 u8 cl, ch, ecx2, ecx3; 266 u8 al, ah, eax2, eax3; 267 }; 268 }; 269 }; 270 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 271 272 /* cmdline.c */ 273 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); 274 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); 275 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) 276 { 277 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 278 279 if (cmd_line_ptr >= 0x100000) 280 return -1; /* inaccessible */ 281 282 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); 283 } 284 285 static inline int cmdline_find_option_bool(const char *option) 286 { 287 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 288 289 if (cmd_line_ptr >= 0x100000) 290 return -1; /* inaccessible */ 291 292 return __cmdline_find_option_bool(cmd_line_ptr, option); 293 } 294 295 /* cpu.c, cpucheck.c */ 296 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 297 int validate_cpu(void); 298 299 /* early_serial_console.c */ 300 extern int early_serial_base; 301 void console_init(void); 302 303 /* edd.c */ 304 void query_edd(void); 305 306 /* header.S */ 307 void __attribute__((noreturn)) die(void); 308 309 /* memory.c */ 310 int detect_memory(void); 311 312 /* pm.c */ 313 void __attribute__((noreturn)) go_to_protected_mode(void); 314 315 /* pmjump.S */ 316 void __attribute__((noreturn)) 317 protected_mode_jump(u32 entrypoint, u32 bootparams); 318 319 /* printf.c */ 320 int sprintf(char *buf, const char *fmt, ...); 321 int vsprintf(char *buf, const char *fmt, va_list args); 322 int printf(const char *fmt, ...); 323 324 /* regs.c */ 325 void initregs(struct biosregs *regs); 326 327 /* string.c */ 328 int strcmp(const char *str1, const char *str2); 329 int strncmp(const char *cs, const char *ct, size_t count); 330 size_t strnlen(const char *s, size_t maxlen); 331 unsigned int atou(const char *s); 332 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); 333 size_t strlen(const char *s); 334 335 /* tty.c */ 336 void puts(const char *); 337 void putchar(int); 338 int getchar(void); 339 void kbd_flush(void); 340 int getchar_timeout(void); 341 342 /* video.c */ 343 void set_video(void); 344 345 /* video-mode.c */ 346 int set_mode(u16 mode); 347 int mode_defined(u16 mode); 348 void probe_cards(int unsafe); 349 350 /* video-vesa.c */ 351 void vesa_store_edid(void); 352 353 #endif /* __ASSEMBLY__ */ 354 355 #endif /* BOOT_BOOT_H */ 356