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 __ASSEMBLY__ 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("rep; nop") 38 io_delay(void)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 ds(void)47 static inline u16 ds(void) 48 { 49 u16 seg; 50 asm("movw %%ds,%0" : "=rm" (seg)); 51 return seg; 52 } 53 set_fs(u16 seg)54 static inline void set_fs(u16 seg) 55 { 56 asm volatile("movw %0,%%fs" : : "rm" (seg)); 57 } fs(void)58 static inline u16 fs(void) 59 { 60 u16 seg; 61 asm volatile("movw %%fs,%0" : "=rm" (seg)); 62 return seg; 63 } 64 set_gs(u16 seg)65 static inline void set_gs(u16 seg) 66 { 67 asm volatile("movw %0,%%gs" : : "rm" (seg)); 68 } gs(void)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 rdfs8(addr_t addr)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 } rdfs16(addr_t addr)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 } rdfs32(addr_t addr)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 wrfs8(u8 v,addr_t addr)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 } wrfs16(u16 v,addr_t addr)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 } wrfs32(u32 v,addr_t addr)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 rdgs8(addr_t addr)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 } rdgs16(addr_t addr)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 } rdgs32(addr_t addr)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 wrgs8(u8 v,addr_t addr)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 } wrgs16(u16 v,addr_t addr)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 } wrgs32(u32 v,addr_t addr)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! */ memcmp_fs(const void * s1,addr_t s2,size_t len)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" CC_SET(nz) 159 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len)); 160 return diff; 161 } memcmp_gs(const void * s1,addr_t s2,size_t len)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" CC_SET(nz) 166 : CC_OUT(nz) (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 )) __get_heap(size_t s,size_t a,size_t n)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 heap_free(size_t n)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 void copy_to_gs(addr_t dst, void *src, size_t len); 197 void *copy_from_gs(void *dst, addr_t src, size_t len); 198 199 /* a20.c */ 200 int enable_a20(void); 201 202 /* apm.c */ 203 int query_apm_bios(void); 204 205 /* bioscall.c */ 206 struct biosregs { 207 union { 208 struct { 209 u32 edi; 210 u32 esi; 211 u32 ebp; 212 u32 _esp; 213 u32 ebx; 214 u32 edx; 215 u32 ecx; 216 u32 eax; 217 u32 _fsgs; 218 u32 _dses; 219 u32 eflags; 220 }; 221 struct { 222 u16 di, hdi; 223 u16 si, hsi; 224 u16 bp, hbp; 225 u16 _sp, _hsp; 226 u16 bx, hbx; 227 u16 dx, hdx; 228 u16 cx, hcx; 229 u16 ax, hax; 230 u16 gs, fs; 231 u16 es, ds; 232 u16 flags, hflags; 233 }; 234 struct { 235 u8 dil, dih, edi2, edi3; 236 u8 sil, sih, esi2, esi3; 237 u8 bpl, bph, ebp2, ebp3; 238 u8 _spl, _sph, _esp2, _esp3; 239 u8 bl, bh, ebx2, ebx3; 240 u8 dl, dh, edx2, edx3; 241 u8 cl, ch, ecx2, ecx3; 242 u8 al, ah, eax2, eax3; 243 }; 244 }; 245 }; 246 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); 247 248 /* cmdline.c */ 249 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); 250 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); cmdline_find_option(const char * option,char * buffer,int bufsize)251 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) 252 { 253 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 254 255 if (cmd_line_ptr >= 0x100000) 256 return -1; /* inaccessible */ 257 258 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); 259 } 260 cmdline_find_option_bool(const char * option)261 static inline int cmdline_find_option_bool(const char *option) 262 { 263 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; 264 265 if (cmd_line_ptr >= 0x100000) 266 return -1; /* inaccessible */ 267 268 return __cmdline_find_option_bool(cmd_line_ptr, option); 269 } 270 271 /* cpu.c, cpucheck.c */ 272 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 273 int check_knl_erratum(void); 274 int validate_cpu(void); 275 276 /* early_serial_console.c */ 277 extern int early_serial_base; 278 void console_init(void); 279 280 /* edd.c */ 281 void query_edd(void); 282 283 /* header.S */ 284 void __attribute__((noreturn)) die(void); 285 286 /* memory.c */ 287 void detect_memory(void); 288 289 /* pm.c */ 290 void __attribute__((noreturn)) go_to_protected_mode(void); 291 292 /* pmjump.S */ 293 void __attribute__((noreturn)) 294 protected_mode_jump(u32 entrypoint, u32 bootparams); 295 296 /* printf.c */ 297 int sprintf(char *buf, const char *fmt, ...); 298 int vsprintf(char *buf, const char *fmt, va_list args); 299 int printf(const char *fmt, ...); 300 301 /* regs.c */ 302 void initregs(struct biosregs *regs); 303 304 /* string.c */ 305 int strcmp(const char *str1, const char *str2); 306 int strncmp(const char *cs, const char *ct, size_t count); 307 size_t strnlen(const char *s, size_t maxlen); 308 unsigned int atou(const char *s); 309 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); 310 size_t strlen(const char *s); 311 char *strchr(const char *s, int c); 312 313 /* tty.c */ 314 void puts(const char *); 315 void putchar(int); 316 int getchar(void); 317 void kbd_flush(void); 318 int getchar_timeout(void); 319 320 /* video.c */ 321 void set_video(void); 322 323 /* video-mode.c */ 324 int set_mode(u16 mode); 325 int mode_defined(u16 mode); 326 void probe_cards(int unsafe); 327 328 /* video-vesa.c */ 329 void vesa_store_edid(void); 330 331 #endif /* __ASSEMBLY__ */ 332 333 #endif /* BOOT_BOOT_H */ 334