arch/x86/boot/boot.h

   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 <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
  30 /* Useful macros */
  31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
  32
  33 extern struct setup_header hdr;
  34 extern struct boot_params boot_params;
  35
  36 #define cpu_relax()     asm volatile("rep; nop")
  37
  38 /* Basic port I/O */
  39 static inline void outb(u8 v, u16 port)
  40 {
  41         asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
  42 }
  43 static inline u8 inb(u16 port)
  44 {
  45         u8 v;
  46         asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
  47         return v;
  48 }
  49
  50 static inline void outw(u16 v, u16 port)
  51 {
  52         asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
  53 }
  54 static inline u16 inw(u16 port)
  55 {
  56         u16 v;
  57         asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
  58         return v;
  59 }
  60
  61 static inline void outl(u32 v, u16 port)
  62 {
  63         asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
  64 }
  65 static inline u32 inl(u16 port)
  66 {
  67         u32 v;
  68         asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
  69         return v;
  70 }
  71
  72 static inline void io_delay(void)
  73 {
  74         const u16 DELAY_PORT = 0x80;
  75         asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
  76 }
  77
  78 /* These functions are used to reference data in other segments. */
  79
  80 static inline u16 ds(void)
  81 {
  82         u16 seg;
  83         asm("movw %%ds,%0" : "=rm" (seg));
  84         return seg;
  85 }
  86
  87 static inline void set_fs(u16 seg)
  88 {
  89         asm volatile("movw %0,%%fs" : : "rm" (seg));
  90 }
  91 static inline u16 fs(void)
  92 {
  93         u16 seg;
  94         asm volatile("movw %%fs,%0" : "=rm" (seg));
  95         return seg;
  96 }
  97
  98 static inline void set_gs(u16 seg)
  99 {
 100         asm volatile("movw %0,%%gs" : : "rm" (seg));
 101 }
 102 static inline u16 gs(void)
 103 {
 104         u16 seg;
 105         asm volatile("movw %%gs,%0" : "=rm" (seg));
 106         return seg;
 107 }
 108
 109 typedef unsigned int addr_t;
 110
 111 static inline u8 rdfs8(addr_t addr)
 112 {
 113         u8 v;
 114         asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 115         return v;
 116 }
 117 static inline u16 rdfs16(addr_t addr)
 118 {
 119         u16 v;
 120         asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 121         return v;
 122 }
 123 static inline u32 rdfs32(addr_t addr)
 124 {
 125         u32 v;
 126         asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 127         return v;
 128 }
 129
 130 static inline void wrfs8(u8 v, addr_t addr)
 131 {
 132         asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 133 }
 134 static inline void wrfs16(u16 v, addr_t addr)
 135 {
 136         asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 137 }
 138 static inline void wrfs32(u32 v, addr_t addr)
 139 {
 140         asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 141 }
 142
 143 static inline u8 rdgs8(addr_t addr)
 144 {
 145         u8 v;
 146         asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
 147         return v;
 148 }
 149 static inline u16 rdgs16(addr_t addr)
 150 {
 151         u16 v;
 152         asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
 153         return v;
 154 }
 155 static inline u32 rdgs32(addr_t addr)
 156 {
 157         u32 v;
 158         asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
 159         return v;
 160 }
 161
 162 static inline void wrgs8(u8 v, addr_t addr)
 163 {
 164         asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
 165 }
 166 static inline void wrgs16(u16 v, addr_t addr)
 167 {
 168         asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
 169 }
 170 static inline void wrgs32(u32 v, addr_t addr)
 171 {
 172         asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
 173 }
 174
 175 /* Note: these only return true/false, not a signed return value! */
 176 static inline bool memcmp_fs(const void *s1, addr_t s2, size_t len)
 177 {
 178         bool diff;
 179         asm volatile("fs; repe; cmpsb" CC_SET(nz)
 180                      : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
 181         return diff;
 182 }
 183 static inline bool memcmp_gs(const void *s1, addr_t s2, size_t len)
 184 {
 185         bool diff;
 186         asm volatile("gs; repe; cmpsb" CC_SET(nz)
 187                      : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
 188         return diff;
 189 }
 190
 191 /* Heap -- available for dynamic lists. */
 192 extern char _end[];
 193 extern char *HEAP;
 194 extern char *heap_end;
 195 #define RESET_HEAP() ((void *)( HEAP = _end ))
 196 static inline char *__get_heap(size_t s, size_t a, size_t n)
 197 {
 198         char *tmp;
 199
 200         HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
 201         tmp = HEAP;
 202         HEAP += s*n;
 203         return tmp;
 204 }
 205 #define GET_HEAP(type, n) \
 206         ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
 207
 208 static inline bool heap_free(size_t n)
 209 {
 210         return (int)(heap_end-HEAP) >= (int)n;
 211 }
 212
 213 /* copy.S */
 214
 215 void copy_to_fs(addr_t dst, void *src, size_t len);
 216 void *copy_from_fs(void *dst, addr_t src, size_t len);
 217 void copy_to_gs(addr_t dst, void *src, size_t len);
 218 void *copy_from_gs(void *dst, addr_t src, size_t len);
 219
 220 /* a20.c */
 221 int enable_a20(void);
 222
 223 /* apm.c */
 224 int query_apm_bios(void);
 225
 226 /* bioscall.c */
 227 struct biosregs {
 228         union {
 229                 struct {
 230                         u32 edi;
 231                         u32 esi;
 232                         u32 ebp;
 233                         u32 _esp;
 234                         u32 ebx;
 235                         u32 edx;
 236                         u32 ecx;
 237                         u32 eax;
 238                         u32 _fsgs;
 239                         u32 _dses;
 240                         u32 eflags;
 241                 };
 242                 struct {
 243                         u16 di, hdi;
 244                         u16 si, hsi;
 245                         u16 bp, hbp;
 246                         u16 _sp, _hsp;
 247                         u16 bx, hbx;
 248                         u16 dx, hdx;
 249                         u16 cx, hcx;
 250                         u16 ax, hax;
 251                         u16 gs, fs;
 252                         u16 es, ds;
 253                         u16 flags, hflags;
 254                 };
 255                 struct {
 256                         u8 dil, dih, edi2, edi3;
 257                         u8 sil, sih, esi2, esi3;
 258                         u8 bpl, bph, ebp2, ebp3;
 259                         u8 _spl, _sph, _esp2, _esp3;
 260                         u8 bl, bh, ebx2, ebx3;
 261                         u8 dl, dh, edx2, edx3;
 262                         u8 cl, ch, ecx2, ecx3;
 263                         u8 al, ah, eax2, eax3;
 264                 };
 265         };
 266 };
 267 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
 268
 269 /* cmdline.c */
 270 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize);
 271 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option);
 272 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
 273 {
 274         unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
 275
 276         if (cmd_line_ptr >= 0x100000)
 277                 return -1;      /* inaccessible */
 278
 279         return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
 280 }
 281
 282 static inline int cmdline_find_option_bool(const char *option)
 283 {
 284         unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
 285
 286         if (cmd_line_ptr >= 0x100000)
 287                 return -1;      /* inaccessible */
 288
 289         return __cmdline_find_option_bool(cmd_line_ptr, option);
 290 }
 291
 292 /* cpu.c, cpucheck.c */
 293 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
 294 int check_knl_erratum(void);
 295 int validate_cpu(void);
 296
 297 /* early_serial_console.c */
 298 extern int early_serial_base;
 299 void console_init(void);
 300
 301 /* edd.c */
 302 void query_edd(void);
 303
 304 /* header.S */
 305 void __attribute__((noreturn)) die(void);
 306
 307 /* memory.c */
 308 void detect_memory(void);
 309
 310 /* pm.c */
 311 void __attribute__((noreturn)) go_to_protected_mode(void);
 312
 313 /* pmjump.S */
 314 void __attribute__((noreturn))
 315         protected_mode_jump(u32 entrypoint, u32 bootparams);
 316
 317 /* printf.c */
 318 int sprintf(char *buf, const char *fmt, ...);
 319 int vsprintf(char *buf, const char *fmt, va_list args);
 320 int printf(const char *fmt, ...);
 321
 322 /* regs.c */
 323 void initregs(struct biosregs *regs);
 324
 325 /* string.c */
 326 int strcmp(const char *str1, const char *str2);
 327 int strncmp(const char *cs, const char *ct, size_t count);
 328 size_t strnlen(const char *s, size_t maxlen);
 329 unsigned int atou(const char *s);
 330 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
 331 size_t strlen(const char *s);
 332 char *strchr(const char *s, int c);
 333
 334 /* tty.c */
 335 void puts(const char *);
 336 void putchar(int);
 337 int getchar(void);
 338 void kbd_flush(void);
 339 int getchar_timeout(void);
 340
 341 /* video.c */
 342 void set_video(void);
 343
 344 /* video-mode.c */
 345 int set_mode(u16 mode);
 346 int mode_defined(u16 mode);
 347 void probe_cards(int unsafe);
 348
 349 /* video-vesa.c */
 350 void vesa_store_edid(void);
 351
 352 #endif /* __ASSEMBLY__ */
 353
 354 #endif /* BOOT_BOOT_H */