1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
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.
9 * ----------------------------------------------------------------------- */
12 * arch/i386/boot/boot.h
14 * Header file for the real-mode kernel code
20 #define STACK_SIZE 512 /* Minimum number of bytes for stack */
25 #include <linux/types.h>
26 #include <linux/edd.h>
28 #include <asm/setup.h>
31 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
33 extern struct setup_header hdr;
34 extern struct boot_params boot_params;
37 static inline void outb(u8 v, u16 port)
39 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
41 static inline u8 inb(u16 port)
44 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
48 static inline void outw(u16 v, u16 port)
50 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
52 static inline u16 inw(u16 port)
55 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
59 static inline void outl(u32 v, u16 port)
61 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
63 static inline u32 inl(u32 port)
66 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
70 static inline void io_delay(void)
72 const u16 DELAY_PORT = 0x80;
73 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
76 /* These functions are used to reference data in other segments. */
78 static inline u16 ds(void)
81 asm("movw %%ds,%0" : "=rm" (seg));
85 static inline void set_fs(u16 seg)
87 asm volatile("movw %0,%%fs" : : "rm" (seg));
89 static inline u16 fs(void)
92 asm volatile("movw %%fs,%0" : "=rm" (seg));
96 static inline void set_gs(u16 seg)
98 asm volatile("movw %0,%%gs" : : "rm" (seg));
100 static inline u16 gs(void)
103 asm volatile("movw %%gs,%0" : "=rm" (seg));
107 typedef unsigned int addr_t;
109 static inline u8 rdfs8(addr_t addr)
112 asm volatile("movb %%fs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
115 static inline u16 rdfs16(addr_t addr)
118 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
121 static inline u32 rdfs32(addr_t addr)
124 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
128 static inline void wrfs8(u8 v, addr_t addr)
130 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "r" (v));
132 static inline void wrfs16(u16 v, addr_t addr)
134 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "r" (v));
136 static inline void wrfs32(u32 v, addr_t addr)
138 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "r" (v));
141 static inline u8 rdgs8(addr_t addr)
144 asm volatile("movb %%gs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
147 static inline u16 rdgs16(addr_t addr)
150 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
153 static inline u32 rdgs32(addr_t addr)
156 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
160 static inline void wrgs8(u8 v, addr_t addr)
162 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "r" (v));
164 static inline void wrgs16(u16 v, addr_t addr)
166 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "r" (v));
168 static inline void wrgs32(u32 v, addr_t addr)
170 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "r" (v));
173 /* Note: these only return true/false, not a signed return value! */
174 static inline int memcmp(const void *s1, const void *s2, size_t len)
177 asm("repe; cmpsb; setnz %0"
178 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
182 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
185 asm volatile("fs; repe; cmpsb; setnz %0"
186 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
189 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
192 asm volatile("gs; repe; cmpsb; setnz %0"
193 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
197 static inline int isdigit(int ch)
199 return (ch >= '0') && (ch <= '9');
202 /* Heap -- available for dynamic lists. */
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)
211 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
216 #define GET_HEAP(type, n) \
217 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
219 static inline bool heap_free(size_t n)
221 return (int)(heap_end-HEAP) >= (int)n;
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);
233 #define memcpy(d,s,l) __builtin_memcpy(d,s,l)
234 #define memset(d,c,l) __builtin_memset(d,c,l)
237 int enable_a20(void);
240 int query_apm_bios(void);
243 int cmdline_find_option(const char *option, char *buffer, int bufsize);
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);
250 void query_edd(void);
253 void __attribute__((noreturn)) die(void);
259 int detect_memory(void);
262 void __attribute__((noreturn)) go_to_protected_mode(void);
265 void __attribute__((noreturn))
266 protected_mode_jump(u32 entrypoint, u32 bootparams);
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, ...);
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);
279 void puts(const char *);
282 void kbd_flush(void);
283 int getchar_timeout(void);
286 void set_video(void);
289 void vesa_store_edid(void);
292 int query_voyager(void);
294 #endif /* __ASSEMBLY__ */
296 #endif /* BOOT_BOOT_H */