1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* -*- linux-c -*- ------------------------------------------------------- * 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright 2007 rPath, Inc. - All Rights Reserved 6 * Copyright 2009 Intel Corporation; author H. Peter Anvin 7 * 8 * ----------------------------------------------------------------------- */ 9 10 /* 11 * Header file for the real-mode kernel code 12 */ 13 14 #ifndef BOOT_BOOT_H 15 #define BOOT_BOOT_H 16 17 #define STACK_SIZE 1024 /* Minimum number of bytes for stack */ 18 19 #ifndef __ASSEMBLER__ 20 21 #include <linux/stdarg.h> 22 #include <linux/types.h> 23 #include <linux/edd.h> 24 #include <asm/setup.h> 25 #include <asm/asm.h> 26 #include "bitops.h" 27 #include "ctype.h" 28 #include "cpuflags.h" 29 #include "io.h" 30 31 /* Useful macros */ 32 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) 33 34 extern struct setup_header hdr; 35 extern struct boot_params boot_params; 36 37 #define cpu_relax() asm volatile("pause") 38 39 static inline void io_delay(void) 40 { 41 const u16 DELAY_PORT = 0x80; 42 outb(0, DELAY_PORT); 43 } 44 45 /* These functions are used to reference data in other segments. */ 46 47 static inline u16 ds(void) 48 { 49 u16 seg; 50 asm("movw %%ds,%0" : "=rm" (seg)); 51 return seg; 52 } 53 54 static inline void set_fs(u16 seg) 55 { 56 asm volatile("movw %0,%%fs" : : "rm" (seg)); 57 } 58 static inline u16 fs(void) 59 { 60 u16 seg; 61 asm volatile("movw %%fs,%0" : "=rm" (seg)); 62 return seg; 63 } 64 65 static inline void set_gs(u16 seg) 66 { 67 asm volatile("movw %0,%%gs" : : "rm" (seg)); 68 } 69 static inline u16 gs(void) 70 { 71 u16 seg; 72 asm volatile("movw %%gs,%0" : "=rm" (seg)); 73 return seg; 74 } 75 76 typedef unsigned int addr_t; 77 78 static inline u8 rdfs8(addr_t addr) 79 { 80 u8 *ptr = (u8 *)absolute_pointer(addr); 81 u8 v; 82 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*ptr)); 83 return v; 84 } 85 static inline u16 rdfs16(addr_t addr) 86 { 87 u16 *ptr = (u16 *)absolute_pointer(addr); 88 u16 v; 89 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*ptr)); 90 return v; 91 } 92 static inline u32 rdfs32(addr_t addr) 93 { 94 u32 *ptr = (u32 *)absolute_pointer(addr); 95 u32 v; 96 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*ptr)); 97 return v; 98 } 99 100 static inline void wrfs8(u8 v, addr_t addr) 101 { 102 u8 *ptr = (u8 *)absolute_pointer(addr); 103 asm volatile("movb %1,%%fs:%0" : "+m" (*ptr) : "qi" (v)); 104 } 105 static inline void wrfs16(u16 v, addr_t addr) 106 { 107 u16 *ptr = (u16 *)absolute_pointer(addr); 108 asm volatile("movw %1,%%fs:%0" : "+m" (*ptr) : "ri" (v)); 109 } 110 static inline void wrfs32(u32 v, addr_t addr) 111 { 112 u32 *ptr = (u32 *)absolute_pointer(addr); 113 asm volatile("movl %1,%%fs:%0" : "+m" (*ptr) : "ri" (v)); 114 } 115 116 static inline u8 rdgs8(addr_t addr) 117 { 118 u8 *ptr = (u8 *)absolute_pointer(addr); 119 u8 v; 120 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*ptr)); 121 return v; 122 } 123 static inline u16 rdgs16(addr_t addr) 124 { 125 u16 *ptr = (u16 *)absolute_pointer(addr); 126 u16 v; 127 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*ptr)); 128 return v; 129 } 130 static inline u32 rdgs32(addr_t addr) 131 { 132 u32 *ptr = (u32 *)absolute_pointer(addr); 133 u32 v; 134 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*ptr)); 135 return v; 136 } 137 138 static inline void wrgs8(u8 v, addr_t addr) 139 { 140 u8 *ptr = (u8 *)absolute_pointer(addr); 141 asm volatile("movb %1,%%gs:%0" : "+m" (*ptr) : "qi" (v)); 142 } 143 static inline void wrgs16(u16 v, addr_t addr) 144 { 145 u16 *ptr = (u16 *)absolute_pointer(addr); 146 asm volatile("movw %1,%%gs:%0" : "+m" (*ptr) : "ri" (v)); 147 } 148 static inline void wrgs32(u32 v, addr_t addr) 149 { 150 u32 *ptr = (u32 *)absolute_pointer(addr); 151 asm volatile("movl %1,%%gs:%0" : "+m" (*ptr) : "ri" (v)); 152 } 153 154 /* Note: these only return true/false, not a signed return value! */ 155 static inline bool memcmp_fs(const void *s1, addr_t s2, size_t len) 156 { 157 bool diff; 158 asm volatile("fs repe cmpsb" 159 : "=@ccnz" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 160 return diff; 161 } 162 static inline bool memcmp_gs(const void *s1, addr_t s2, size_t len) 163 { 164 bool diff; 165 asm volatile("gs repe cmpsb" 166 : "=@ccnz" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 167 return diff; 168 } 169 170 /* Heap -- available for dynamic lists. */ 171 extern char _end[]; 172 extern char *HEAP; 173 extern char *heap_end; 174 #define RESET_HEAP() ((void *)( HEAP = _end )) 175 static inline char *__get_heap(size_t s, size_t a, size_t n) 176 { 177 char *tmp; 178 179 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); 180 tmp = HEAP; 181 HEAP += s*n; 182 return tmp; 183 } 184 #define GET_HEAP(type, n) \ 185 ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) 186 187 static inline bool heap_free(size_t n) 188 { 189 return (int)(heap_end-HEAP) >= (int)n; 190 } 191 192 /* copy.S */ 193 194 void copy_to_fs(addr_t dst, void *src, size_t len); 195 void *copy_from_fs(void *dst, addr_t src, size_t len); 196 197 /* a20.c */ 198 int enable_a20(void); 199 200 /* apm.c */ 201 int query_apm_bios(void); 202 203 /* bioscall.c */ 204 struct biosregs { 205 union { 206 struct { 207 u32 edi; 208 u32 esi; 209 u32 ebp; 210 u32 _esp; 211 u32 ebx; 212 u32 edx; 213 u32 ecx; 214 u32 eax; 215 u32 _fsgs; 216 u32 _dses; 217 u32 eflags; 218 }; 219 struct { 220 u16 di, hdi; 221 u16 si, hsi; 222 u16 bp, hbp; 223 u16 _sp, _hsp; 224 u16 bx, hbx; 225 u16 dx, hdx; 226 u16 cx, hcx; 227 u16 ax, hax; 228 u16 gs, fs; 229 u16 es, ds; 230 u16 flags, hflags; 231 }; 232 struct { 233 u8 dil, dih, edi2, edi3; 234 u8 sil, sih, esi2, esi3; 235 u8 bpl, bph, ebp2, ebp3; 236 u8 _spl, _sph, _esp2, _esp3; 237 u8 bl, bh, ebx2, ebx3; 238 u8 dl, dh, edx2, edx3; 239 u8 cl, ch, ecx2, ecx3; 240 u8 al, ah, eax2, eax3; 241 }; 242 }; 243 }; 244 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 245 246 /* cmdline.c */ 247 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); 248 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); 249 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) 250 { 251 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 252 253 if (cmd_line_ptr >= 0x100000) 254 return -1; /* inaccessible */ 255 256 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); 257 } 258 259 static inline int cmdline_find_option_bool(const char *option) 260 { 261 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 262 263 if (cmd_line_ptr >= 0x100000) 264 return -1; /* inaccessible */ 265 266 return __cmdline_find_option_bool(cmd_line_ptr, option); 267 } 268 269 /* cpu.c, cpucheck.c */ 270 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 271 int check_knl_erratum(void); 272 int validate_cpu(void); 273 274 /* early_serial_console.c */ 275 extern int early_serial_base; 276 void console_init(void); 277 278 /* edd.c */ 279 void query_edd(void); 280 281 /* header.S */ 282 void __attribute__((noreturn)) die(void); 283 284 /* memory.c */ 285 void detect_memory(void); 286 287 /* pm.c */ 288 void __attribute__((noreturn)) go_to_protected_mode(void); 289 290 /* pmjump.S */ 291 void __attribute__((noreturn)) 292 protected_mode_jump(u32 entrypoint, u32 bootparams); 293 294 /* printf.c */ 295 int sprintf(char *buf, const char *fmt, ...); 296 int vsprintf(char *buf, const char *fmt, va_list args); 297 int printf(const char *fmt, ...); 298 299 /* regs.c */ 300 void initregs(struct biosregs *regs); 301 302 /* string.c */ 303 int strcmp(const char *str1, const char *str2); 304 int strncmp(const char *cs, const char *ct, size_t count); 305 size_t strnlen(const char *s, size_t maxlen); 306 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); 307 size_t strlen(const char *s); 308 char *strchr(const char *s, int c); 309 310 /* tty.c */ 311 void puts(const char *); 312 void putchar(int); 313 int getchar(void); 314 void kbd_flush(void); 315 int getchar_timeout(void); 316 317 /* video.c */ 318 void set_video(void); 319 320 /* video-mode.c */ 321 int set_mode(u16 mode); 322 int mode_defined(u16 mode); 323 void probe_cards(int unsafe); 324 325 /* video-vesa.c */ 326 void vesa_store_edid(void); 327 328 #endif /* __ASSEMBLER__ */ 329 330 #endif /* BOOT_BOOT_H */ 331