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>
26 #include <asm/setup.h>
32 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
34 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
36 extern struct setup_header hdr;
37 extern struct boot_params boot_params;
39 #define cpu_relax() asm volatile("rep; nop")
42 static inline void outb(u8 v, u16 port)
44 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
46 static inline u8 inb(u16 port)
49 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
53 static inline void outw(u16 v, u16 port)
55 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
57 static inline u16 inw(u16 port)
60 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
64 static inline void outl(u32 v, u16 port)
66 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
68 static inline u32 inl(u16 port)
71 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
75 static inline void io_delay(void)
77 const u16 DELAY_PORT = 0x80;
78 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
81 /* These functions are used to reference data in other segments. */
83 static inline u16 ds(void)
86 asm("movw %%ds,%0" : "=rm" (seg));
90 static inline void set_fs(u16 seg)
92 asm volatile("movw %0,%%fs" : : "rm" (seg));
94 static inline u16 fs(void)
97 asm volatile("movw %%fs,%0" : "=rm" (seg));
101 static inline void set_gs(u16 seg)
103 asm volatile("movw %0,%%gs" : : "rm" (seg));
105 static inline u16 gs(void)
108 asm volatile("movw %%gs,%0" : "=rm" (seg));
112 typedef unsigned int addr_t;
114 static inline u8 rdfs8(addr_t addr)
117 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
120 static inline u16 rdfs16(addr_t addr)
123 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
126 static inline u32 rdfs32(addr_t addr)
129 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
133 static inline void wrfs8(u8 v, addr_t addr)
135 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
137 static inline void wrfs16(u16 v, addr_t addr)
139 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
141 static inline void wrfs32(u32 v, addr_t addr)
143 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
146 static inline u8 rdgs8(addr_t addr)
149 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
152 static inline u16 rdgs16(addr_t addr)
155 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
158 static inline u32 rdgs32(addr_t addr)
161 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
165 static inline void wrgs8(u8 v, addr_t addr)
167 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
169 static inline void wrgs16(u16 v, addr_t addr)
171 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
173 static inline void wrgs32(u32 v, addr_t addr)
175 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
178 /* Note: these only return true/false, not a signed return value! */
179 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
182 asm volatile("fs; repe; cmpsb; setnz %0"
183 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
186 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
189 asm volatile("gs; repe; cmpsb; setnz %0"
190 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
194 /* Heap -- available for dynamic lists. */
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)
203 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
208 #define GET_HEAP(type, n) \
209 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
211 static inline bool heap_free(size_t n)
213 return (int)(heap_end-HEAP) >= (int)n;
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);
224 int enable_a20(void);
227 int query_apm_bios(void);
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;
270 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
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);
275 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
277 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
279 if (cmd_line_ptr >= 0x100000)
280 return -1; /* inaccessible */
282 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
285 static inline int cmdline_find_option_bool(const char *option)
287 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
289 if (cmd_line_ptr >= 0x100000)
290 return -1; /* inaccessible */
292 return __cmdline_find_option_bool(cmd_line_ptr, option);
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);
299 /* early_serial_console.c */
300 extern int early_serial_base;
301 void console_init(void);
304 void query_edd(void);
307 void __attribute__((noreturn)) die(void);
310 int detect_memory(void);
313 void __attribute__((noreturn)) go_to_protected_mode(void);
316 void __attribute__((noreturn))
317 protected_mode_jump(u32 entrypoint, u32 bootparams);
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, ...);
325 void initregs(struct biosregs *regs);
328 int strcmp(const char *str1, const char *str2);
329 int strncmp(const char *cs, const char *ct, size_t count);
330 size_t strnlen(const char *s, size_t maxlen);
331 unsigned int atou(const char *s);
332 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
333 size_t strlen(const char *s);
336 void puts(const char *);
339 void kbd_flush(void);
340 int getchar_timeout(void);
343 void set_video(void);
346 int set_mode(u16 mode);
347 int mode_defined(u16 mode);
348 void probe_cards(int unsafe);
351 void vesa_store_edid(void);
353 #endif /* __ASSEMBLY__ */
355 #endif /* BOOT_BOOT_H */