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 38extern struct setup_header hdr; 39extern struct boot_params boot_params; 40 41#define cpu_relax() asm volatile("rep; nop") 42 43/* Basic port I/O */ 44static inline void outb(u8 v, u16 port) 45{ 46 asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); 47} 48static inline u8 inb(u16 port) 49{ 50 u8 v; 51 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); 52 return v; 53} 54 55static inline void outw(u16 v, u16 port) 56{ 57 asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); 58} 59static inline u16 inw(u16 port) 60{ 61 u16 v; 62 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); 63 return v; 64} 65 66static inline void outl(u32 v, u16 port) 67{ 68 asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); 69} 70static inline u32 inl(u32 port) 71{ 72 u32 v; 73 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); 74 return v; 75} 76 77static 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 85static inline u16 ds(void) 86{ 87 u16 seg; 88 asm("movw %%ds,%0" : "=rm" (seg)); 89 return seg; 90} 91 92static inline void set_fs(u16 seg) 93{ 94 asm volatile("movw %0,%%fs" : : "rm" (seg)); 95} 96static inline u16 fs(void) 97{ 98 u16 seg; 99 asm volatile("movw %%fs,%0" : "=rm" (seg)); 100 return seg; 101} 102 103static inline void set_gs(u16 seg) 104{ 105 asm volatile("movw %0,%%gs" : : "rm" (seg)); 106} 107static inline u16 gs(void) 108{ 109 u16 seg; 110 asm volatile("movw %%gs,%0" : "=rm" (seg)); 111 return seg; 112} 113 114typedef unsigned int addr_t; 115 116static 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} 122static 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} 128static 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 135static inline void wrfs8(u8 v, addr_t addr) 136{ 137 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 138} 139static inline void wrfs16(u16 v, addr_t addr) 140{ 141 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 142} 143static inline void wrfs32(u32 v, addr_t addr) 144{ 145 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 146} 147 148static 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} 154static 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} 160static 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 167static inline void wrgs8(u8 v, addr_t addr) 168{ 169 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 170} 171static inline void wrgs16(u16 v, addr_t addr) 172{ 173 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 174} 175static 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! */ 181static 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 189static 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} 196static 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. */ 205extern char _end[]; 206extern char *HEAP; 207extern char *heap_end; 208#define RESET_HEAP() ((void *)( HEAP = _end )) 209static 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 221static inline bool heap_free(size_t n) 222{ 223 return (int)(heap_end-HEAP) >= (int)n; 224} 225 226/* copy.S */ 227 228void copy_to_fs(addr_t dst, void *src, size_t len); 229void *copy_from_fs(void *dst, addr_t src, size_t len); 230void copy_to_gs(addr_t dst, void *src, size_t len); 231void *copy_from_gs(void *dst, addr_t src, size_t len); 232void *memcpy(void *dst, void *src, size_t len); 233void *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 */ 239int enable_a20(void); 240 241/* apm.c */ 242int query_apm_bios(void); 243 244/* bioscall.c */ 245struct 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}; 285void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 286 287/* cmdline.c */ 288int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int bufsize); 289int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option); 290static 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 295static 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 */ 302struct cpu_features { 303 int level; /* Family, or 64 for x86-64 */ 304 int model; 305 u32 flags[NCAPINTS]; 306}; 307extern struct cpu_features cpu; 308int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 309int validate_cpu(void); 310 311/* early_serial_console.c */ 312extern int early_serial_base; 313void console_init(void); 314 315/* edd.c */ 316void query_edd(void); 317 318/* header.S */ 319void __attribute__((noreturn)) die(void); 320 321/* mca.c */ 322int query_mca(void); 323 324/* memory.c */ 325int detect_memory(void); 326 327/* pm.c */ 328void __attribute__((noreturn)) go_to_protected_mode(void); 329 330/* pmjump.S */ 331void __attribute__((noreturn)) 332 protected_mode_jump(u32 entrypoint, u32 bootparams); 333 334/* printf.c */ 335int sprintf(char *buf, const char *fmt, ...); 336int vsprintf(char *buf, const char *fmt, va_list args); 337int printf(const char *fmt, ...); 338 339/* regs.c */ 340void initregs(struct biosregs *regs); 341 342/* string.c */ 343int strcmp(const char *str1, const char *str2); 344int strncmp(const char *cs, const char *ct, size_t count); 345size_t strnlen(const char *s, size_t maxlen); 346unsigned int atou(const char *s); 347unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); 348 349/* tty.c */ 350void puts(const char *); 351void putchar(int); 352int getchar(void); 353void kbd_flush(void); 354int getchar_timeout(void); 355 356/* video.c */ 357void set_video(void); 358 359/* video-mode.c */ 360int set_mode(u16 mode); 361int mode_defined(u16 mode); 362void probe_cards(int unsafe); 363 364/* video-vesa.c */ 365void vesa_store_edid(void); 366 367#endif /* __ASSEMBLY__ */ 368 369#endif /* BOOT_BOOT_H */ 370