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 <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
  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" CC_SET(nz)
 159                      : CC_OUT(nz) (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" 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 ))
 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 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);
 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
 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 */