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 1024 /* Minimum number of bytes for stack */
24 #include <linux/types.h>
25 #include <linux/edd.h>
26 #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)
117 u8 *ptr = (u8 *)absolute_pointer(addr);
119 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*ptr));
122 static inline u16 rdfs16(addr_t addr)
124 u16 *ptr = (u16 *)absolute_pointer(addr);
126 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
129 static inline u32 rdfs32(addr_t addr)
131 u32 *ptr = (u32 *)absolute_pointer(addr);
133 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
137 static inline void wrfs8(u8 v, addr_t addr)
139 u8 *ptr = (u8 *)absolute_pointer(addr);
140 asm volatile("movb %1,%%fs:%0" : "+m" (*ptr) : "qi" (v));
142 static inline void wrfs16(u16 v, addr_t addr)
144 u16 *ptr = (u16 *)absolute_pointer(addr);
145 asm volatile("movw %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
147 static inline void wrfs32(u32 v, addr_t addr)
149 u32 *ptr = (u32 *)absolute_pointer(addr);
150 asm volatile("movl %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
153 static inline u8 rdgs8(addr_t addr)
155 u8 *ptr = (u8 *)absolute_pointer(addr);
157 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*ptr));
160 static inline u16 rdgs16(addr_t addr)
162 u16 *ptr = (u16 *)absolute_pointer(addr);
164 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
167 static inline u32 rdgs32(addr_t addr)
169 u32 *ptr = (u32 *)absolute_pointer(addr);
171 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
175 static inline void wrgs8(u8 v, addr_t addr)
177 u8 *ptr = (u8 *)absolute_pointer(addr);
178 asm volatile("movb %1,%%gs:%0" : "+m" (*ptr) : "qi" (v));
180 static inline void wrgs16(u16 v, addr_t addr)
182 u16 *ptr = (u16 *)absolute_pointer(addr);
183 asm volatile("movw %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
185 static inline void wrgs32(u32 v, addr_t addr)
187 u32 *ptr = (u32 *)absolute_pointer(addr);
188 asm volatile("movl %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
191 /* Note: these only return true/false, not a signed return value! */
192 static inline bool memcmp_fs(const void *s1, addr_t s2, size_t len)
195 asm volatile("fs; repe; cmpsb" CC_SET(nz)
196 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
199 static inline bool memcmp_gs(const void *s1, addr_t s2, size_t len)
202 asm volatile("gs; repe; cmpsb" CC_SET(nz)
203 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
207 /* Heap -- available for dynamic lists. */
210 extern char *heap_end;
211 #define RESET_HEAP() ((void *)( HEAP = _end ))
212 static inline char *__get_heap(size_t s, size_t a, size_t n)
216 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
221 #define GET_HEAP(type, n) \
222 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
224 static inline bool heap_free(size_t n)
226 return (int)(heap_end-HEAP) >= (int)n;
231 void copy_to_fs(addr_t dst, void *src, size_t len);
232 void *copy_from_fs(void *dst, addr_t src, size_t len);
233 void copy_to_gs(addr_t dst, void *src, size_t len);
234 void *copy_from_gs(void *dst, addr_t src, size_t len);
237 int enable_a20(void);
240 int query_apm_bios(void);
272 u8 dil, dih, edi2, edi3;
273 u8 sil, sih, esi2, esi3;
274 u8 bpl, bph, ebp2, ebp3;
275 u8 _spl, _sph, _esp2, _esp3;
276 u8 bl, bh, ebx2, ebx3;
277 u8 dl, dh, edx2, edx3;
278 u8 cl, ch, ecx2, ecx3;
279 u8 al, ah, eax2, eax3;
283 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
286 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize);
287 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option);
288 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
290 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
292 if (cmd_line_ptr >= 0x100000)
293 return -1; /* inaccessible */
295 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
298 static inline int cmdline_find_option_bool(const char *option)
300 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
302 if (cmd_line_ptr >= 0x100000)
303 return -1; /* inaccessible */
305 return __cmdline_find_option_bool(cmd_line_ptr, option);
308 /* cpu.c, cpucheck.c */
309 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
310 int check_knl_erratum(void);
311 int validate_cpu(void);
313 /* early_serial_console.c */
314 extern int early_serial_base;
315 void console_init(void);
318 void query_edd(void);
321 void __attribute__((noreturn)) die(void);
324 int detect_memory(void);
327 void __attribute__((noreturn)) go_to_protected_mode(void);
330 void __attribute__((noreturn))
331 protected_mode_jump(u32 entrypoint, u32 bootparams);
334 int sprintf(char *buf, const char *fmt, ...);
335 int vsprintf(char *buf, const char *fmt, va_list args);
336 int printf(const char *fmt, ...);
339 void initregs(struct biosregs *regs);
342 int strcmp(const char *str1, const char *str2);
343 int strncmp(const char *cs, const char *ct, size_t count);
344 size_t strnlen(const char *s, size_t maxlen);
345 unsigned int atou(const char *s);
346 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
347 size_t strlen(const char *s);
348 char *strchr(const char *s, int c);
351 void puts(const char *);
354 void kbd_flush(void);
355 int getchar_timeout(void);
358 void set_video(void);
361 int set_mode(u16 mode);
362 int mode_defined(u16 mode);
363 void probe_cards(int unsafe);
366 void vesa_store_edid(void);
368 #endif /* __ASSEMBLY__ */
370 #endif /* BOOT_BOOT_H */