1 /* -*- linux-c -*- ------------------------------------------------------- * 2 * 3 * Copyright (C) 1991, 1992 Linus Torvalds 4 * Copyright 2007 rPath, Inc. - All Rights Reserved 5 * 6 * This file is part of the Linux kernel, and is made available under 7 * the terms of the GNU General Public License version 2. 8 * 9 * ----------------------------------------------------------------------- */ 10 11 /* 12 * arch/i386/boot/boot.h 13 * 14 * Header file for the real-mode kernel code 15 */ 16 17 #ifndef BOOT_BOOT_H 18 #define BOOT_BOOT_H 19 20 #ifndef __ASSEMBLY__ 21 22 #include <stdarg.h> 23 #include <linux/types.h> 24 #include <linux/edd.h> 25 #include <asm/boot.h> 26 #include <asm/bootparam.h> 27 28 /* Useful macros */ 29 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 30 31 extern struct setup_header hdr; 32 extern struct boot_params boot_params; 33 34 /* Basic port I/O */ 35 static inline void outb(u8 v, u16 port) 36 { 37 asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); 38 } 39 static inline u8 inb(u16 port) 40 { 41 u8 v; 42 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); 43 return v; 44 } 45 46 static inline void outw(u16 v, u16 port) 47 { 48 asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); 49 } 50 static inline u16 inw(u16 port) 51 { 52 u16 v; 53 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); 54 return v; 55 } 56 57 static inline void outl(u32 v, u16 port) 58 { 59 asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); 60 } 61 static inline u32 inl(u32 port) 62 { 63 u32 v; 64 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); 65 return v; 66 } 67 68 static inline void io_delay(void) 69 { 70 const u16 DELAY_PORT = 0x80; 71 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); 72 } 73 74 /* These functions are used to reference data in other segments. */ 75 76 static inline u16 ds(void) 77 { 78 u16 seg; 79 asm("movw %%ds,%0" : "=rm" (seg)); 80 return seg; 81 } 82 83 static inline void set_fs(u16 seg) 84 { 85 asm volatile("movw %0,%%fs" : : "rm" (seg)); 86 } 87 static inline u16 fs(void) 88 { 89 u16 seg; 90 asm volatile("movw %%fs,%0" : "=rm" (seg)); 91 return seg; 92 } 93 94 static inline void set_gs(u16 seg) 95 { 96 asm volatile("movw %0,%%gs" : : "rm" (seg)); 97 } 98 static inline u16 gs(void) 99 { 100 u16 seg; 101 asm volatile("movw %%gs,%0" : "=rm" (seg)); 102 return seg; 103 } 104 105 typedef unsigned int addr_t; 106 107 static inline u8 rdfs8(addr_t addr) 108 { 109 u8 v; 110 asm volatile("movb %%fs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr)); 111 return v; 112 } 113 static inline u16 rdfs16(addr_t addr) 114 { 115 u16 v; 116 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 117 return v; 118 } 119 static inline u32 rdfs32(addr_t addr) 120 { 121 u32 v; 122 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 123 return v; 124 } 125 126 static inline void wrfs8(u8 v, addr_t addr) 127 { 128 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "r" (v)); 129 } 130 static inline void wrfs16(u16 v, addr_t addr) 131 { 132 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "r" (v)); 133 } 134 static inline void wrfs32(u32 v, addr_t addr) 135 { 136 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "r" (v)); 137 } 138 139 static inline u8 rdgs8(addr_t addr) 140 { 141 u8 v; 142 asm volatile("movb %%gs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr)); 143 return v; 144 } 145 static inline u16 rdgs16(addr_t addr) 146 { 147 u16 v; 148 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); 149 return v; 150 } 151 static inline u32 rdgs32(addr_t addr) 152 { 153 u32 v; 154 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); 155 return v; 156 } 157 158 static inline void wrgs8(u8 v, addr_t addr) 159 { 160 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "r" (v)); 161 } 162 static inline void wrgs16(u16 v, addr_t addr) 163 { 164 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "r" (v)); 165 } 166 static inline void wrgs32(u32 v, addr_t addr) 167 { 168 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "r" (v)); 169 } 170 171 /* Note: these only return true/false, not a signed return value! */ 172 static inline int memcmp(const void *s1, const void *s2, size_t len) 173 { 174 u8 diff; 175 asm("repe; cmpsb; setnz %0" 176 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 177 return diff; 178 } 179 180 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) 181 { 182 u8 diff; 183 asm volatile("fs; repe; cmpsb; setnz %0" 184 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 185 return diff; 186 } 187 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) 188 { 189 u8 diff; 190 asm volatile("gs; repe; cmpsb; setnz %0" 191 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); 192 return diff; 193 } 194 195 static inline int isdigit(int ch) 196 { 197 return (ch >= '0') && (ch <= '9'); 198 } 199 200 /* Heap -- available for dynamic lists. */ 201 #define STACK_SIZE 512 /* Minimum number of bytes for stack */ 202 203 extern char _end[]; 204 extern char *HEAP; 205 extern char *heap_end; 206 #define RESET_HEAP() ((void *)( HEAP = _end )) 207 static inline char *__get_heap(size_t s, size_t a, size_t n) 208 { 209 char *tmp; 210 211 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); 212 tmp = HEAP; 213 HEAP += s*n; 214 return tmp; 215 } 216 #define GET_HEAP(type, n) \ 217 ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) 218 219 static inline int heap_free(void) 220 { 221 return heap_end-HEAP; 222 } 223 224 /* copy.S */ 225 226 void copy_to_fs(addr_t dst, void *src, size_t len); 227 void *copy_from_fs(void *dst, addr_t src, size_t len); 228 void copy_to_gs(addr_t dst, void *src, size_t len); 229 void *copy_from_gs(void *dst, addr_t src, size_t len); 230 void *memcpy(void *dst, void *src, size_t len); 231 void *memset(void *dst, int c, size_t len); 232 233 #define memcpy(d,s,l) __builtin_memcpy(d,s,l) 234 #define memset(d,c,l) __builtin_memset(d,c,l) 235 236 /* a20.c */ 237 int enable_a20(void); 238 239 /* apm.c */ 240 int query_apm_bios(void); 241 242 /* cmdline.c */ 243 int cmdline_find_option(const char *option, char *buffer, int bufsize); 244 245 /* cpu.c, cpucheck.c */ 246 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); 247 int validate_cpu(void); 248 249 /* edd.c */ 250 void query_edd(void); 251 252 /* header.S */ 253 void __attribute__((noreturn)) die(void); 254 255 /* mca.c */ 256 int query_mca(void); 257 258 /* memory.c */ 259 int detect_memory(void); 260 261 /* pm.c */ 262 void __attribute__((noreturn)) go_to_protected_mode(void); 263 264 /* pmjump.S */ 265 void __attribute__((noreturn)) 266 protected_mode_jump(u32 entrypoint, u32 bootparams); 267 268 /* printf.c */ 269 int sprintf(char *buf, const char *fmt, ...); 270 int vsprintf(char *buf, const char *fmt, va_list args); 271 int printf(const char *fmt, ...); 272 273 /* string.c */ 274 int strcmp(const char *str1, const char *str2); 275 size_t strnlen(const char *s, size_t maxlen); 276 unsigned int atou(const char *s); 277 278 /* tty.c */ 279 void puts(const char *); 280 void putchar(int); 281 int getchar(void); 282 void kbd_flush(void); 283 int getchar_timeout(void); 284 285 /* video.c */ 286 void set_video(void); 287 288 /* video-vesa.c */ 289 void vesa_store_edid(void); 290 291 /* voyager.c */ 292 int query_voyager(void); 293 294 #endif /* __ASSEMBLY__ */ 295 296 #endif /* BOOT_BOOT_H */ 297