/arch/x86/boot/boot.h
C++ Header | 355 lines | 268 code | 50 blank | 37 comment | 1 complexity | 8da494fc807fe7f8fee6677a610b07de MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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 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/* Basic port I/O */ 41static inline void outb(u8 v, u16 port) 42{ 43 asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); 44} 45static inline u8 inb(u16 port) 46{ 47 u8 v; 48 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); 49 return v; 50} 51 52static inline void outw(u16 v, u16 port) 53{ 54 asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); 55} 56static inline u16 inw(u16 port) 57{ 58 u16 v; 59 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); 60 return v; 61} 62 63static inline void outl(u32 v, u16 port) 64{ 65 asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); 66} 67static inline u32 inl(u32 port) 68{ 69 u32 v; 70 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); 71 return v; 72} 73 74static inline void io_delay(void) 75{ 76 const u16 DELAY_PORT = 0x80; 77 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); 78} 79 80/* These functions are used to reference data in other segments. */ 81 82static inline u16 ds(void) 83{ 84 u16 seg; 85 asm("movw %%ds,%0" : "=rm" (seg)); 86 return seg; 87} 88 89static inline void set_fs(u16 seg) 90{ 91 asm volatile("movw %0,%%fs" : : "rm" (seg)); 92} 93static inline u16 fs(void) 94{ 95 u16 seg; 96 asm volatile("movw %%fs,%0" : "=rm" (seg)); 97 return seg; 98} 99 100static inline void set_gs(u16 seg) 101{ 102 asm volatile("movw %0,%%gs" : : "rm" (seg)); 103} 104static inline u16 gs(void) 105{ 106 u16 seg; 107 asm volatile("movw %%gs,%0" : "=rm" (seg)); 108 return seg; 109} 110 111typedef unsigned int addr_t; 112 113static inline u8 rdfs8(addr_t addr) 114{ 115 u8 v; 116 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); 117 return v; 118} 119static inline u16 rdfs16(addr_t addr) 120{ 121 u16 v; 122 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 123 return v; 124} 125static inline u32 rdfs32(addr_t addr) 126{ 127 u32 v; 128 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 129 return v; 130} 131 132static inline void wrfs8(u8 v, addr_t addr) 133{ 134 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 135} 136static inline void wrfs16(u16 v, addr_t addr) 137{ 138 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 139} 140static inline void wrfs32(u32 v, addr_t addr) 141{ 142 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 143} 144 145static inline u8 rdgs8(addr_t addr) 146{ 147 u8 v; 148 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); 149 return v; 150} 151static inline u16 rdgs16(addr_t addr) 152{ 153 u16 v; 154 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 155 return v; 156} 157static inline u32 rdgs32(addr_t addr) 158{ 159 u32 v; 160 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 161 return v; 162} 163 164static inline void wrgs8(u8 v, addr_t addr) 165{ 166 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); 167} 168static inline void wrgs16(u16 v, addr_t addr) 169{ 170 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); 171} 172static inline void wrgs32(u32 v, addr_t addr) 173{ 174 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); 175} 176 177/* Note: these only return true/false, not a signed return value! */ 178static inline int memcmp(const void *s1, const void *s2, size_t len) 179{ 180 u8 diff; 181 asm("repe; cmpsb; setnz %0" 182 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 183 return diff; 184} 185 186static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) 187{ 188 u8 diff; 189 asm volatile("fs; repe; cmpsb; setnz %0" 190 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 191 return diff; 192} 193static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) 194{ 195 u8 diff; 196 asm volatile("gs; repe; cmpsb; setnz %0" 197 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 198 return diff; 199} 200 201static inline int isdigit(int ch) 202{ 203 return (ch >= '0') && (ch <= '9'); 204} 205 206/* Heap -- available for dynamic lists. */ 207extern char _end[]; 208extern char *HEAP; 209extern char *heap_end; 210#define RESET_HEAP() ((void *)( HEAP = _end )) 211static inline char *__get_heap(size_t s, size_t a, size_t n) 212{ 213 char *tmp; 214 215 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); 216 tmp = HEAP; 217 HEAP += s*n; 218 return tmp; 219} 220#define GET_HEAP(type, n) \ 221 ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) 222 223static inline bool heap_free(size_t n) 224{ 225 return (int)(heap_end-HEAP) >= (int)n; 226} 227 228/* copy.S */ 229 230void copy_to_fs(addr_t dst, void *src, size_t len); 231void *copy_from_fs(void *dst, addr_t src, size_t len); 232void copy_to_gs(addr_t dst, void *src, size_t len); 233void *copy_from_gs(void *dst, addr_t src, size_t len); 234void *memcpy(void *dst, void *src, size_t len); 235void *memset(void *dst, int c, size_t len); 236 237#define memcpy(d,s,l) __builtin_memcpy(d,s,l) 238#define memset(d,c,l) __builtin_memset(d,c,l) 239 240/* a20.c */ 241int enable_a20(void); 242 243/* apm.c */ 244int query_apm_bios(void); 245 246/* bioscall.c */ 247struct biosregs { 248 union { 249 struct { 250 u32 edi; 251 u32 esi; 252 u32 ebp; 253 u32 _esp; 254 u32 ebx; 255 u32 edx; 256 u32 ecx; 257 u32 eax; 258 u32 _fsgs; 259 u32 _dses; 260 u32 eflags; 261 }; 262 struct { 263 u16 di, hdi; 264 u16 si, hsi; 265 u16 bp, hbp; 266 u16 _sp, _hsp; 267 u16 bx, hbx; 268 u16 dx, hdx; 269 u16 cx, hcx; 270 u16 ax, hax; 271 u16 gs, fs; 272 u16 es, ds; 273 u16 flags, hflags; 274 }; 275 struct { 276 u8 dil, dih, edi2, edi3; 277 u8 sil, sih, esi2, esi3; 278 u8 bpl, bph, ebp2, ebp3; 279 u8 _spl, _sph, _esp2, _esp3; 280 u8 bl, bh, ebx2, ebx3; 281 u8 dl, dh, edx2, edx3; 282 u8 cl, ch, ecx2, ecx3; 283 u8 al, ah, eax2, eax3; 284 }; 285 }; 286}; 287void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 288 289/* cmdline.c */ 290int cmdline_find_option(const char *option, char *buffer, int bufsize); 291int cmdline_find_option_bool(const char *option); 292 293/* cpu.c, cpucheck.c */ 294struct cpu_features { 295 int level; /* Family, or 64 for x86-64 */ 296 int model; 297 u32 flags[NCAPINTS]; 298}; 299extern struct cpu_features cpu; 300int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 301int validate_cpu(void); 302 303/* edd.c */ 304void query_edd(void); 305 306/* header.S */ 307void __attribute__((noreturn)) die(void); 308 309/* mca.c */ 310int query_mca(void); 311 312/* memory.c */ 313int detect_memory(void); 314 315/* pm.c */ 316void __attribute__((noreturn)) go_to_protected_mode(void); 317 318/* pmjump.S */ 319void __attribute__((noreturn)) 320 protected_mode_jump(u32 entrypoint, u32 bootparams); 321 322/* printf.c */ 323int sprintf(char *buf, const char *fmt, ...); 324int vsprintf(char *buf, const char *fmt, va_list args); 325int printf(const char *fmt, ...); 326 327/* regs.c */ 328void initregs(struct biosregs *regs); 329 330/* string.c */ 331int strcmp(const char *str1, const char *str2); 332size_t strnlen(const char *s, size_t maxlen); 333unsigned int atou(const char *s); 334 335/* tty.c */ 336void puts(const char *); 337void putchar(int); 338int getchar(void); 339void kbd_flush(void); 340int getchar_timeout(void); 341 342/* video.c */ 343void set_video(void); 344 345/* video-mode.c */ 346int set_mode(u16 mode); 347int mode_defined(u16 mode); 348void probe_cards(int unsafe); 349 350/* video-vesa.c */ 351void vesa_store_edid(void); 352 353#endif /* __ASSEMBLY__ */ 354 355#endif /* BOOT_BOOT_H */