H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 1 | /* -*- linux-c -*- ------------------------------------------------------- * |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 4 | * Copyright 2007 rPath, Inc. - All Rights Reserved |
H. Peter Anvin | 7a734e7 | 2009-04-01 18:08:28 -0700 | [diff] [blame] | 5 | * Copyright 2009 Intel Corporation; author H. Peter Anvin |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 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 | /* |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 13 | * Header file for the real-mode kernel code |
| 14 | */ |
| 15 | |
| 16 | #ifndef BOOT_BOOT_H |
| 17 | #define BOOT_BOOT_H |
| 18 | |
H. Peter Anvin | 6b6815c | 2007-10-25 16:11:33 -0700 | [diff] [blame] | 19 | #define STACK_SIZE 512 /* Minimum number of bytes for stack */ |
| 20 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 21 | #ifndef __ASSEMBLY__ |
| 22 | |
| 23 | #include <stdarg.h> |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/edd.h> |
H. Peter Anvin | fa76dab | 2007-10-23 22:37:25 +0200 | [diff] [blame] | 26 | #include <asm/setup.h> |
H. Peter Anvin | c2dcfde | 2008-08-13 13:14:22 -0700 | [diff] [blame] | 27 | #include "bitops.h" |
H. Peter Anvin | 6238b47 | 2010-08-02 21:03:46 -0700 | [diff] [blame] | 28 | #include "ctype.h" |
Kees Cook | dd78b97 | 2013-10-10 17:18:13 -0700 | [diff] [blame] | 29 | #include "cpuflags.h" |
Joerg Roedel | 7b27718 | 2008-08-13 10:07:05 +0200 | [diff] [blame] | 30 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 31 | /* Useful macros */ |
| 32 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
| 33 | |
Andi Kleen | 1b72691 | 2008-08-18 09:06:01 +0200 | [diff] [blame] | 34 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
| 35 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 36 | extern struct setup_header hdr; |
| 37 | extern struct boot_params boot_params; |
| 38 | |
Pekka Enberg | fa97bdf | 2010-07-11 11:06:57 +0300 | [diff] [blame] | 39 | #define cpu_relax() asm volatile("rep; nop") |
| 40 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 41 | /* Basic port I/O */ |
| 42 | static inline void outb(u8 v, u16 port) |
| 43 | { |
| 44 | asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); |
| 45 | } |
| 46 | static inline u8 inb(u16 port) |
| 47 | { |
| 48 | u8 v; |
| 49 | asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); |
| 50 | return v; |
| 51 | } |
| 52 | |
| 53 | static inline void outw(u16 v, u16 port) |
| 54 | { |
| 55 | asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); |
| 56 | } |
| 57 | static inline u16 inw(u16 port) |
| 58 | { |
| 59 | u16 v; |
| 60 | asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); |
| 61 | return v; |
| 62 | } |
| 63 | |
| 64 | static inline void outl(u32 v, u16 port) |
| 65 | { |
H. Peter Anvin | 5593eaa | 2007-07-14 16:47:13 -0700 | [diff] [blame] | 66 | asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 67 | } |
He Chunhui | 35f1790 | 2012-02-01 00:48:28 +0800 | [diff] [blame] | 68 | static inline u32 inl(u16 port) |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 69 | { |
| 70 | u32 v; |
| 71 | asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); |
| 72 | return v; |
| 73 | } |
| 74 | |
| 75 | static inline void io_delay(void) |
| 76 | { |
| 77 | const u16 DELAY_PORT = 0x80; |
| 78 | asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); |
| 79 | } |
| 80 | |
| 81 | /* These functions are used to reference data in other segments. */ |
| 82 | |
| 83 | static inline u16 ds(void) |
| 84 | { |
| 85 | u16 seg; |
| 86 | asm("movw %%ds,%0" : "=rm" (seg)); |
| 87 | return seg; |
| 88 | } |
| 89 | |
| 90 | static inline void set_fs(u16 seg) |
| 91 | { |
| 92 | asm volatile("movw %0,%%fs" : : "rm" (seg)); |
| 93 | } |
| 94 | static inline u16 fs(void) |
| 95 | { |
| 96 | u16 seg; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 97 | asm volatile("movw %%fs,%0" : "=rm" (seg)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 98 | return seg; |
| 99 | } |
| 100 | |
| 101 | static inline void set_gs(u16 seg) |
| 102 | { |
| 103 | asm volatile("movw %0,%%gs" : : "rm" (seg)); |
| 104 | } |
| 105 | static inline u16 gs(void) |
| 106 | { |
| 107 | u16 seg; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 108 | asm volatile("movw %%gs,%0" : "=rm" (seg)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 109 | return seg; |
| 110 | } |
| 111 | |
| 112 | typedef unsigned int addr_t; |
| 113 | |
| 114 | static inline u8 rdfs8(addr_t addr) |
| 115 | { |
| 116 | u8 v; |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 117 | asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 118 | return v; |
| 119 | } |
| 120 | static inline u16 rdfs16(addr_t addr) |
| 121 | { |
| 122 | u16 v; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 123 | asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 124 | return v; |
| 125 | } |
| 126 | static inline u32 rdfs32(addr_t addr) |
| 127 | { |
| 128 | u32 v; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 129 | asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 130 | return v; |
| 131 | } |
| 132 | |
| 133 | static inline void wrfs8(u8 v, addr_t addr) |
| 134 | { |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 135 | asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 136 | } |
| 137 | static inline void wrfs16(u16 v, addr_t addr) |
| 138 | { |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 139 | asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 140 | } |
| 141 | static inline void wrfs32(u32 v, addr_t addr) |
| 142 | { |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 143 | asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | static inline u8 rdgs8(addr_t addr) |
| 147 | { |
| 148 | u8 v; |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 149 | asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 150 | return v; |
| 151 | } |
| 152 | static inline u16 rdgs16(addr_t addr) |
| 153 | { |
| 154 | u16 v; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 155 | asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 156 | return v; |
| 157 | } |
| 158 | static inline u32 rdgs32(addr_t addr) |
| 159 | { |
| 160 | u32 v; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 161 | asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 162 | return v; |
| 163 | } |
| 164 | |
| 165 | static inline void wrgs8(u8 v, addr_t addr) |
| 166 | { |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 167 | asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 168 | } |
| 169 | static inline void wrgs16(u16 v, addr_t addr) |
| 170 | { |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 171 | asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 172 | } |
| 173 | static inline void wrgs32(u32 v, addr_t addr) |
| 174 | { |
H. Peter Anvin | 811a0ff | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 175 | asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | /* Note: these only return true/false, not a signed return value! */ |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 179 | static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) |
| 180 | { |
| 181 | u8 diff; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 182 | asm volatile("fs; repe; cmpsb; setnz %0" |
| 183 | : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 184 | return diff; |
| 185 | } |
| 186 | static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) |
| 187 | { |
| 188 | u8 diff; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 189 | asm volatile("gs; repe; cmpsb; setnz %0" |
| 190 | : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 191 | return diff; |
| 192 | } |
| 193 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 194 | /* Heap -- available for dynamic lists. */ |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 195 | extern char _end[]; |
| 196 | extern char *HEAP; |
| 197 | extern char *heap_end; |
| 198 | #define RESET_HEAP() ((void *)( HEAP = _end )) |
| 199 | static inline char *__get_heap(size_t s, size_t a, size_t n) |
| 200 | { |
| 201 | char *tmp; |
| 202 | |
| 203 | HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); |
| 204 | tmp = HEAP; |
| 205 | HEAP += s*n; |
| 206 | return tmp; |
| 207 | } |
| 208 | #define GET_HEAP(type, n) \ |
| 209 | ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) |
| 210 | |
H. Peter Anvin | e6e1ace | 2007-10-25 16:09:38 -0700 | [diff] [blame] | 211 | static inline bool heap_free(size_t n) |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 212 | { |
H. Peter Anvin | e6e1ace | 2007-10-25 16:09:38 -0700 | [diff] [blame] | 213 | return (int)(heap_end-HEAP) >= (int)n; |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | /* copy.S */ |
| 217 | |
| 218 | void copy_to_fs(addr_t dst, void *src, size_t len); |
| 219 | void *copy_from_fs(void *dst, addr_t src, size_t len); |
| 220 | void copy_to_gs(addr_t dst, void *src, size_t len); |
| 221 | void *copy_from_gs(void *dst, addr_t src, size_t len); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 222 | |
| 223 | /* a20.c */ |
| 224 | int enable_a20(void); |
| 225 | |
| 226 | /* apm.c */ |
| 227 | int query_apm_bios(void); |
| 228 | |
H. Peter Anvin | 7a734e7 | 2009-04-01 18:08:28 -0700 | [diff] [blame] | 229 | /* bioscall.c */ |
| 230 | struct biosregs { |
| 231 | union { |
| 232 | struct { |
| 233 | u32 edi; |
| 234 | u32 esi; |
| 235 | u32 ebp; |
| 236 | u32 _esp; |
| 237 | u32 ebx; |
| 238 | u32 edx; |
| 239 | u32 ecx; |
| 240 | u32 eax; |
| 241 | u32 _fsgs; |
| 242 | u32 _dses; |
| 243 | u32 eflags; |
| 244 | }; |
| 245 | struct { |
| 246 | u16 di, hdi; |
| 247 | u16 si, hsi; |
| 248 | u16 bp, hbp; |
| 249 | u16 _sp, _hsp; |
| 250 | u16 bx, hbx; |
| 251 | u16 dx, hdx; |
| 252 | u16 cx, hcx; |
| 253 | u16 ax, hax; |
| 254 | u16 gs, fs; |
| 255 | u16 es, ds; |
| 256 | u16 flags, hflags; |
| 257 | }; |
| 258 | struct { |
| 259 | u8 dil, dih, edi2, edi3; |
| 260 | u8 sil, sih, esi2, esi3; |
| 261 | u8 bpl, bph, ebp2, ebp3; |
| 262 | u8 _spl, _sph, _esp2, _esp3; |
| 263 | u8 bl, bh, ebx2, ebx3; |
| 264 | u8 dl, dh, edx2, edx3; |
| 265 | u8 cl, ch, ecx2, ecx3; |
| 266 | u8 al, ah, eax2, eax3; |
| 267 | }; |
| 268 | }; |
| 269 | }; |
| 270 | void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); |
| 271 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 272 | /* cmdline.c */ |
Yinghai Lu | 3db07e7 | 2013-01-24 12:19:59 -0800 | [diff] [blame] | 273 | int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); |
| 274 | int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); |
Yinghai Lu | f4ed287 | 2010-08-02 02:17:31 -0700 | [diff] [blame] | 275 | static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) |
| 276 | { |
Yinghai Lu | 3db07e7 | 2013-01-24 12:19:59 -0800 | [diff] [blame] | 277 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; |
Yinghai Lu | 16a4baa | 2013-01-24 12:19:58 -0800 | [diff] [blame] | 278 | |
| 279 | if (cmd_line_ptr >= 0x100000) |
| 280 | return -1; /* inaccessible */ |
| 281 | |
| 282 | return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); |
Yinghai Lu | f4ed287 | 2010-08-02 02:17:31 -0700 | [diff] [blame] | 283 | } |
| 284 | |
| 285 | static inline int cmdline_find_option_bool(const char *option) |
| 286 | { |
Yinghai Lu | 3db07e7 | 2013-01-24 12:19:59 -0800 | [diff] [blame] | 287 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; |
Yinghai Lu | 16a4baa | 2013-01-24 12:19:58 -0800 | [diff] [blame] | 288 | |
| 289 | if (cmd_line_ptr >= 0x100000) |
| 290 | return -1; /* inaccessible */ |
| 291 | |
| 292 | return __cmdline_find_option_bool(cmd_line_ptr, option); |
Yinghai Lu | f4ed287 | 2010-08-02 02:17:31 -0700 | [diff] [blame] | 293 | } |
| 294 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 295 | /* cpu.c, cpucheck.c */ |
| 296 | int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); |
| 297 | int validate_cpu(void); |
| 298 | |
Yinghai Lu | f4ed287 | 2010-08-02 02:17:31 -0700 | [diff] [blame] | 299 | /* early_serial_console.c */ |
| 300 | extern int early_serial_base; |
| 301 | void console_init(void); |
| 302 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 303 | /* edd.c */ |
| 304 | void query_edd(void); |
| 305 | |
| 306 | /* header.S */ |
| 307 | void __attribute__((noreturn)) die(void); |
| 308 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 309 | /* memory.c */ |
| 310 | int detect_memory(void); |
| 311 | |
| 312 | /* pm.c */ |
| 313 | void __attribute__((noreturn)) go_to_protected_mode(void); |
| 314 | |
| 315 | /* pmjump.S */ |
| 316 | void __attribute__((noreturn)) |
| 317 | protected_mode_jump(u32 entrypoint, u32 bootparams); |
| 318 | |
| 319 | /* printf.c */ |
| 320 | int sprintf(char *buf, const char *fmt, ...); |
| 321 | int vsprintf(char *buf, const char *fmt, va_list args); |
| 322 | int printf(const char *fmt, ...); |
| 323 | |
H. Peter Anvin | 7a734e7 | 2009-04-01 18:08:28 -0700 | [diff] [blame] | 324 | /* regs.c */ |
| 325 | void initregs(struct biosregs *regs); |
| 326 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 327 | /* string.c */ |
| 328 | int strcmp(const char *str1, const char *str2); |
Pekka Enberg | fa97bdf | 2010-07-11 11:06:57 +0300 | [diff] [blame] | 329 | int strncmp(const char *cs, const char *ct, size_t count); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 330 | size_t strnlen(const char *s, size_t maxlen); |
| 331 | unsigned int atou(const char *s); |
Pekka Enberg | fa97bdf | 2010-07-11 11:06:57 +0300 | [diff] [blame] | 332 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); |
Fred Chen | 062fe8f | 2013-08-13 11:13:00 -0700 | [diff] [blame] | 333 | size_t strlen(const char *s); |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 334 | |
| 335 | /* tty.c */ |
| 336 | void puts(const char *); |
| 337 | void putchar(int); |
| 338 | int getchar(void); |
| 339 | void kbd_flush(void); |
| 340 | int getchar_timeout(void); |
| 341 | |
| 342 | /* video.c */ |
| 343 | void set_video(void); |
| 344 | |
Pavel Machek | e44b7b7 | 2008-04-10 23:28:10 +0200 | [diff] [blame] | 345 | /* video-mode.c */ |
| 346 | int set_mode(u16 mode); |
| 347 | int mode_defined(u16 mode); |
| 348 | void probe_cards(int unsafe); |
| 349 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 350 | /* video-vesa.c */ |
| 351 | void vesa_store_edid(void); |
| 352 | |
H. Peter Anvin | 62bd033 | 2007-07-11 12:18:39 -0700 | [diff] [blame] | 353 | #endif /* __ASSEMBLY__ */ |
| 354 | |
| 355 | #endif /* BOOT_BOOT_H */ |