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 * Header file for the real-mode kernel code
18 #define STACK_SIZE 512 /* Minimum number of bytes for stack */
23 #include <linux/types.h>
24 #include <linux/edd.h>
26 #include <asm/setup.h>
28 #include <asm/cpufeature.h>
31 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
33 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
35 extern struct setup_header hdr;
36 extern struct boot_params boot_params;
39 static inline void outb(u8 v, u16 port)
41 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
43 static inline u8 inb(u16 port)
46 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
50 static inline void outw(u16 v, u16 port)
52 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
54 static inline u16 inw(u16 port)
57 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
61 static inline void outl(u32 v, u16 port)
63 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
65 static inline u32 inl(u32 port)
68 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
72 static inline void io_delay(void)
74 const u16 DELAY_PORT = 0x80;
75 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
78 /* These functions are used to reference data in other segments. */
80 static inline u16 ds(void)
83 asm("movw %%ds,%0" : "=rm" (seg));
87 static inline void set_fs(u16 seg)
89 asm volatile("movw %0,%%fs" : : "rm" (seg));
91 static inline u16 fs(void)
94 asm volatile("movw %%fs,%0" : "=rm" (seg));
98 static inline void set_gs(u16 seg)
100 asm volatile("movw %0,%%gs" : : "rm" (seg));
102 static inline u16 gs(void)
105 asm volatile("movw %%gs,%0" : "=rm" (seg));
109 typedef unsigned int addr_t;
111 static inline u8 rdfs8(addr_t addr)
114 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
117 static inline u16 rdfs16(addr_t addr)
120 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
123 static inline u32 rdfs32(addr_t addr)
126 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
130 static inline void wrfs8(u8 v, addr_t addr)
132 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
134 static inline void wrfs16(u16 v, addr_t addr)
136 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
138 static inline void wrfs32(u32 v, addr_t addr)
140 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
143 static inline u8 rdgs8(addr_t addr)
146 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
149 static inline u16 rdgs16(addr_t addr)
152 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
155 static inline u32 rdgs32(addr_t addr)
158 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
162 static inline void wrgs8(u8 v, addr_t addr)
164 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
166 static inline void wrgs16(u16 v, addr_t addr)
168 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
170 static inline void wrgs32(u32 v, addr_t addr)
172 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
175 /* Note: these only return true/false, not a signed return value! */
176 static inline int memcmp(const void *s1, const void *s2, size_t len)
179 asm("repe; cmpsb; setnz %0"
180 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
184 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
187 asm volatile("fs; repe; cmpsb; setnz %0"
188 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
191 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
194 asm volatile("gs; repe; cmpsb; setnz %0"
195 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
199 static inline int isdigit(int ch)
201 return (ch >= '0') && (ch <= '9');
204 /* Heap -- available for dynamic lists. */
207 extern char *heap_end;
208 #define RESET_HEAP() ((void *)( HEAP = _end ))
209 static inline char *__get_heap(size_t s, size_t a, size_t n)
213 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
218 #define GET_HEAP(type, n) \
219 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
221 static inline bool heap_free(size_t n)
223 return (int)(heap_end-HEAP) >= (int)n;
228 void copy_to_fs(addr_t dst, void *src, size_t len);
229 void *copy_from_fs(void *dst, addr_t src, size_t len);
230 void copy_to_gs(addr_t dst, void *src, size_t len);
231 void *copy_from_gs(void *dst, addr_t src, size_t len);
232 void *memcpy(void *dst, void *src, size_t len);
233 void *memset(void *dst, int c, size_t len);
235 #define memcpy(d,s,l) __builtin_memcpy(d,s,l)
236 #define memset(d,c,l) __builtin_memset(d,c,l)
239 int enable_a20(void);
242 int query_apm_bios(void);
245 int cmdline_find_option(const char *option, char *buffer, int bufsize);
246 int cmdline_find_option_bool(const char *option);
248 /* cpu.c, cpucheck.c */
249 struct cpu_features {
250 int level; /* Family, or 64 for x86-64 */
254 extern struct cpu_features cpu;
255 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
256 int validate_cpu(void);
259 void query_edd(void);
262 void __attribute__((noreturn)) die(void);
268 int detect_memory(void);
271 void __attribute__((noreturn)) go_to_protected_mode(void);
274 void __attribute__((noreturn))
275 protected_mode_jump(u32 entrypoint, u32 bootparams);
278 int sprintf(char *buf, const char *fmt, ...);
279 int vsprintf(char *buf, const char *fmt, va_list args);
280 int printf(const char *fmt, ...);
283 int strcmp(const char *str1, const char *str2);
284 size_t strnlen(const char *s, size_t maxlen);
285 unsigned int atou(const char *s);
288 void puts(const char *);
291 void kbd_flush(void);
292 int getchar_timeout(void);
295 void set_video(void);
298 int set_mode(u16 mode);
299 int mode_defined(u16 mode);
300 void probe_cards(int unsafe);
303 void vesa_store_edid(void);
306 int query_voyager(void);
308 #endif /* __ASSEMBLY__ */
310 #endif /* BOOT_BOOT_H */