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 37extern struct setup_header hdr; 38extern struct boot_params boot_params; 39 40#define cpu_relax() asm volatile("rep; nop") 41 42/* Basic port I/O */ 43static inline void outb(u8 v, u16 port) 44{ 45 asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); 46} 47static inline u8 inb(u16 port) 48{ 49 u8 v; 50 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); 51 return v; 52} 53 54static inline void outw(u16 v, u16 port) 55{ 56 asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); 57} 58static inline u16 inw(u16 port) 59{ 60 u16 v; 61 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); 62 return v; 63} 64 65static inline void outl(u32 v, u16 port) 66{ 67 asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); 68} 69static inline u32 inl(u16 port) 70{ 71 u32 v; 72 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); 73 return v; 74} 75 76static 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 84static inline u16 ds(void) 85{ 86 u16 seg; 87 asm("movw %%ds,%0" : "=rm" (seg)); 88 return seg; 89} 90 91static inline void set_fs(u16 seg) 92{ 93 asm volatile("movw %0,%%fs" : : "rm" (seg)); 94} 95static inline u16 fs(void) 96{ 97 u16 seg; 98 asm volatile("movw %%fs,%0" : "=rm" (seg)); 99 return seg; 100} 101 102static inline void set_gs(u16 seg) 103{ 104 asm volatile("movw %0,%%gs" : : "rm" (seg)); 105} 106static inline u16 gs(void) 107{ 108 u16 seg; 109 asm volatile("movw %%gs,%0" : "=rm" (seg)); 110 return seg; 111} 112 113typedef unsigned int addr_t; 114 115static 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} 121static 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} 127static 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 134static inline void wrfs8(u8 v, addr_t addr) 135{ 136 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 137} 138static inline void wrfs16(u16 v, addr_t addr) 139{ 140 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 141} 142static inline void wrfs32(u32 v, addr_t addr) 143{ 144 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 145} 146 147static 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} 153static 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} 159static 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 166static inline void wrgs8(u8 v, addr_t addr) 167{ 168 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 169} 170static inline void wrgs16(u16 v, addr_t addr) 171{ 172 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 173} 174static 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! */ 180static 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} 187static 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. */ 196extern char _end[]; 197extern char *HEAP; 198extern char *heap_end; 199#define RESET_HEAP() ((void *)( HEAP = _end )) 200static 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 212static inline bool heap_free(size_t n) 213{ 214 return (int)(heap_end-HEAP) >= (int)n; 215} 216 217/* copy.S */ 218 219void copy_to_fs(addr_t dst, void *src, size_t len); 220void *copy_from_fs(void *dst, addr_t src, size_t len); 221void copy_to_gs(addr_t dst, void *src, size_t len); 222void *copy_from_gs(void *dst, addr_t src, size_t len); 223 224/* a20.c */ 225int enable_a20(void); 226 227/* apm.c */ 228int query_apm_bios(void); 229 230/* bioscall.c */ 231struct 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}; 271void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 272 273/* cmdline.c */ 274int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); 275int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); 276static 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 286static 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 */ 297int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 298int validate_cpu(void); 299 300/* early_serial_console.c */ 301extern int early_serial_base; 302void console_init(void); 303 304/* edd.c */ 305void query_edd(void); 306 307/* header.S */ 308void __attribute__((noreturn)) die(void); 309 310/* mca.c */ 311int query_mca(void); 312 313/* memory.c */ 314int detect_memory(void); 315 316/* pm.c */ 317void __attribute__((noreturn)) go_to_protected_mode(void); 318 319/* pmjump.S */ 320void __attribute__((noreturn)) 321 protected_mode_jump(u32 entrypoint, u32 bootparams); 322 323/* printf.c */ 324int sprintf(char *buf, const char *fmt, ...); 325int vsprintf(char *buf, const char *fmt, va_list args); 326int printf(const char *fmt, ...); 327 328/* regs.c */ 329void initregs(struct biosregs *regs); 330 331/* string.c */ 332int strcmp(const char *str1, const char *str2); 333int strncmp(const char *cs, const char *ct, size_t count); 334size_t strnlen(const char *s, size_t maxlen); 335unsigned int atou(const char *s); 336unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); 337size_t strlen(const char *s); 338 339/* tty.c */ 340void puts(const char *); 341void putchar(int); 342int getchar(void); 343void kbd_flush(void); 344int getchar_timeout(void); 345 346/* video.c */ 347void set_video(void); 348 349/* video-mode.c */ 350int set_mode(u16 mode); 351int mode_defined(u16 mode); 352void probe_cards(int unsafe); 353 354/* video-vesa.c */ 355void vesa_store_edid(void); 356 357#endif /* __ASSEMBLY__ */ 358 359#endif /* BOOT_BOOT_H */ 360