]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - arch/x86/boot/boot.h
1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 * Copyright 2009 Intel Corporation; author H. Peter Anvin
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.
10 * ----------------------------------------------------------------------- */
13 * Header file for the real-mode kernel code
19 #define STACK_SIZE 512 /* Minimum number of bytes for stack */
24 #include <linux/types.h>
25 #include <linux/edd.h>
27 #include <asm/setup.h>
33 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
35 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
37 extern struct setup_header hdr
;
38 extern struct boot_params boot_params
;
40 #define cpu_relax() asm volatile("rep; nop")
43 static inline void outb(u8 v
, u16 port
)
45 asm volatile("outb %0,%1" : : "a" (v
), "dN" (port
));
47 static inline u8
inb(u16 port
)
50 asm volatile("inb %1,%0" : "=a" (v
) : "dN" (port
));
54 static inline void outw(u16 v
, u16 port
)
56 asm volatile("outw %0,%1" : : "a" (v
), "dN" (port
));
58 static inline u16
inw(u16 port
)
61 asm volatile("inw %1,%0" : "=a" (v
) : "dN" (port
));
65 static inline void outl(u32 v
, u16 port
)
67 asm volatile("outl %0,%1" : : "a" (v
), "dN" (port
));
69 static inline u32
inl(u16 port
)
72 asm volatile("inl %1,%0" : "=a" (v
) : "dN" (port
));
76 static inline void io_delay(void)
78 const u16 DELAY_PORT
= 0x80;
79 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT
));
82 /* These functions are used to reference data in other segments. */
84 static inline u16
ds(void)
87 asm("movw %%ds,%0" : "=rm" (seg
));
91 static inline void set_fs(u16 seg
)
93 asm volatile("movw %0,%%fs" : : "rm" (seg
));
95 static inline u16
fs(void)
98 asm volatile("movw %%fs,%0" : "=rm" (seg
));
102 static inline void set_gs(u16 seg
)
104 asm volatile("movw %0,%%gs" : : "rm" (seg
));
106 static inline u16
gs(void)
109 asm volatile("movw %%gs,%0" : "=rm" (seg
));
113 typedef unsigned int addr_t
;
115 static inline u8
rdfs8(addr_t addr
)
118 asm volatile("movb %%fs:%1,%0" : "=q" (v
) : "m" (*(u8
*)addr
));
121 static inline u16
rdfs16(addr_t addr
)
124 asm volatile("movw %%fs:%1,%0" : "=r" (v
) : "m" (*(u16
*)addr
));
127 static inline u32
rdfs32(addr_t addr
)
130 asm volatile("movl %%fs:%1,%0" : "=r" (v
) : "m" (*(u32
*)addr
));
134 static inline void wrfs8(u8 v
, addr_t addr
)
136 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8
*)addr
) : "qi" (v
));
138 static inline void wrfs16(u16 v
, addr_t addr
)
140 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16
*)addr
) : "ri" (v
));
142 static inline void wrfs32(u32 v
, addr_t addr
)
144 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32
*)addr
) : "ri" (v
));
147 static inline u8
rdgs8(addr_t addr
)
150 asm volatile("movb %%gs:%1,%0" : "=q" (v
) : "m" (*(u8
*)addr
));
153 static inline u16
rdgs16(addr_t addr
)
156 asm volatile("movw %%gs:%1,%0" : "=r" (v
) : "m" (*(u16
*)addr
));
159 static inline u32
rdgs32(addr_t addr
)
162 asm volatile("movl %%gs:%1,%0" : "=r" (v
) : "m" (*(u32
*)addr
));
166 static inline void wrgs8(u8 v
, addr_t addr
)
168 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8
*)addr
) : "qi" (v
));
170 static inline void wrgs16(u16 v
, addr_t addr
)
172 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16
*)addr
) : "ri" (v
));
174 static inline void wrgs32(u32 v
, addr_t addr
)
176 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32
*)addr
) : "ri" (v
));
179 /* Note: these only return true/false, not a signed return value! */
180 static inline int memcmp_fs(const void *s1
, addr_t s2
, size_t len
)
183 asm volatile("fs; repe; cmpsb; setnz %0"
184 : "=qm" (diff
), "+D" (s1
), "+S" (s2
), "+c" (len
));
187 static inline int memcmp_gs(const void *s1
, addr_t s2
, size_t len
)
190 asm volatile("gs; repe; cmpsb; setnz %0"
191 : "=qm" (diff
), "+D" (s1
), "+S" (s2
), "+c" (len
));
195 /* Heap -- available for dynamic lists. */
198 extern char *heap_end
;
199 #define RESET_HEAP() ((void *)( HEAP = _end ))
200 static inline char *__get_heap(size_t s
, size_t a
, size_t n
)
204 HEAP
= (char *)(((size_t)HEAP
+(a
-1)) & ~(a
-1));
209 #define GET_HEAP(type, n) \
210 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
212 static inline bool heap_free(size_t n
)
214 return (int)(heap_end
-HEAP
) >= (int)n
;
219 void copy_to_fs(addr_t dst
, void *src
, size_t len
);
220 void *copy_from_fs(void *dst
, addr_t src
, size_t len
);
221 void copy_to_gs(addr_t dst
, void *src
, size_t len
);
222 void *copy_from_gs(void *dst
, addr_t src
, size_t len
);
225 int enable_a20(void);
228 int query_apm_bios(void);
260 u8 dil
, dih
, edi2
, edi3
;
261 u8 sil
, sih
, esi2
, esi3
;
262 u8 bpl
, bph
, ebp2
, ebp3
;
263 u8 _spl
, _sph
, _esp2
, _esp3
;
264 u8 bl
, bh
, ebx2
, ebx3
;
265 u8 dl
, dh
, edx2
, edx3
;
266 u8 cl
, ch
, ecx2
, ecx3
;
267 u8 al
, ah
, eax2
, eax3
;
271 void intcall(u8 int_no
, const struct biosregs
*ireg
, struct biosregs
*oreg
);
274 int __cmdline_find_option(unsigned long cmdline_ptr
, const char *option
, char *buffer
, int bufsize
);
275 int __cmdline_find_option_bool(unsigned long cmdline_ptr
, const char *option
);
276 static inline int cmdline_find_option(const char *option
, char *buffer
, int bufsize
)
278 unsigned long cmd_line_ptr
= boot_params
.hdr
.cmd_line_ptr
;
280 if (cmd_line_ptr
>= 0x100000)
281 return -1; /* inaccessible */
283 return __cmdline_find_option(cmd_line_ptr
, option
, buffer
, bufsize
);
286 static inline int cmdline_find_option_bool(const char *option
)
288 unsigned long cmd_line_ptr
= boot_params
.hdr
.cmd_line_ptr
;
290 if (cmd_line_ptr
>= 0x100000)
291 return -1; /* inaccessible */
293 return __cmdline_find_option_bool(cmd_line_ptr
, option
);
296 /* cpu.c, cpucheck.c */
297 int check_cpu(int *cpu_level_ptr
, int *req_level_ptr
, u32
**err_flags_ptr
);
298 int validate_cpu(void);
300 /* early_serial_console.c */
301 extern int early_serial_base
;
302 void console_init(void);
305 void query_edd(void);
308 void __attribute__((noreturn
)) die(void);
311 int detect_memory(void);
314 void __attribute__((noreturn
)) go_to_protected_mode(void);
317 void __attribute__((noreturn
))
318 protected_mode_jump(u32 entrypoint
, u32 bootparams
);
321 int sprintf(char *buf
, const char *fmt
, ...);
322 int vsprintf(char *buf
, const char *fmt
, va_list args
);
323 int printf(const char *fmt
, ...);
326 void initregs(struct biosregs
*regs
);
329 int strcmp(const char *str1
, const char *str2
);
330 int strncmp(const char *cs
, const char *ct
, size_t count
);
331 size_t strnlen(const char *s
, size_t maxlen
);
332 unsigned int atou(const char *s
);
333 unsigned long long simple_strtoull(const char *cp
, char **endp
, unsigned int base
);
334 size_t strlen(const char *s
);
337 void puts(const char *);
340 void kbd_flush(void);
341 int getchar_timeout(void);
344 void set_video(void);
347 int set_mode(u16 mode
);
348 int mode_defined(u16 mode
);
349 void probe_cards(int unsafe
);
352 void vesa_store_edid(void);
354 #endif /* __ASSEMBLY__ */
356 #endif /* BOOT_BOOT_H */