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>
29 #include <asm/cpufeature.h>
30 #include <asm/processor-flags.h>
34 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
36 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
38 extern struct setup_header hdr;
39 extern struct boot_params boot_params;
41 #define cpu_relax() asm volatile("rep; nop")
44 static inline void outb(u8 v, u16 port)
46 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
48 static inline u8 inb(u16 port)
51 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
55 static inline void outw(u16 v, u16 port)
57 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
59 static inline u16 inw(u16 port)
62 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
66 static inline void outl(u32 v, u16 port)
68 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
70 static inline u32 inl(u32 port)
73 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
77 static inline void io_delay(void)
79 const u16 DELAY_PORT = 0x80;
80 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
83 /* These functions are used to reference data in other segments. */
85 static inline u16 ds(void)
88 asm("movw %%ds,%0" : "=rm" (seg));
92 static inline void set_fs(u16 seg)
94 asm volatile("movw %0,%%fs" : : "rm" (seg));
96 static inline u16 fs(void)
99 asm volatile("movw %%fs,%0" : "=rm" (seg));
103 static inline void set_gs(u16 seg)
105 asm volatile("movw %0,%%gs" : : "rm" (seg));
107 static inline u16 gs(void)
110 asm volatile("movw %%gs,%0" : "=rm" (seg));
114 typedef unsigned int addr_t;
116 static inline u8 rdfs8(addr_t addr)
119 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
122 static inline u16 rdfs16(addr_t addr)
125 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
128 static inline u32 rdfs32(addr_t addr)
131 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
135 static inline void wrfs8(u8 v, addr_t addr)
137 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
139 static inline void wrfs16(u16 v, addr_t addr)
141 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
143 static inline void wrfs32(u32 v, addr_t addr)
145 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
148 static inline u8 rdgs8(addr_t addr)
151 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
154 static inline u16 rdgs16(addr_t addr)
157 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
160 static inline u32 rdgs32(addr_t addr)
163 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
167 static inline void wrgs8(u8 v, addr_t addr)
169 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
171 static inline void wrgs16(u16 v, addr_t addr)
173 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
175 static inline void wrgs32(u32 v, addr_t addr)
177 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
180 /* Note: these only return true/false, not a signed return value! */
181 static inline int memcmp(const void *s1, const void *s2, size_t len)
184 asm("repe; cmpsb; setnz %0"
185 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
189 static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
192 asm volatile("fs; repe; cmpsb; setnz %0"
193 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
196 static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
199 asm volatile("gs; repe; cmpsb; setnz %0"
200 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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);
274 u8 dil, dih, edi2, edi3;
275 u8 sil, sih, esi2, esi3;
276 u8 bpl, bph, ebp2, ebp3;
277 u8 _spl, _sph, _esp2, _esp3;
278 u8 bl, bh, ebx2, ebx3;
279 u8 dl, dh, edx2, edx3;
280 u8 cl, ch, ecx2, ecx3;
281 u8 al, ah, eax2, eax3;
285 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
288 int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int bufsize);
289 int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option);
290 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
292 return __cmdline_find_option(boot_params.hdr.cmd_line_ptr, option, buffer, bufsize);
295 static inline int cmdline_find_option_bool(const char *option)
297 return __cmdline_find_option_bool(boot_params.hdr.cmd_line_ptr, option);
301 /* cpu.c, cpucheck.c */
302 struct cpu_features {
303 int level; /* Family, or 64 for x86-64 */
307 extern struct cpu_features cpu;
308 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
309 int validate_cpu(void);
311 /* early_serial_console.c */
312 extern int early_serial_base;
313 void console_init(void);
316 void query_edd(void);
319 void __attribute__((noreturn)) die(void);
325 int detect_memory(void);
328 void __attribute__((noreturn)) go_to_protected_mode(void);
331 void __attribute__((noreturn))
332 protected_mode_jump(u32 entrypoint, u32 bootparams);
335 int sprintf(char *buf, const char *fmt, ...);
336 int vsprintf(char *buf, const char *fmt, va_list args);
337 int printf(const char *fmt, ...);
340 void initregs(struct biosregs *regs);
343 int strcmp(const char *str1, const char *str2);
344 int strncmp(const char *cs, const char *ct, size_t count);
345 size_t strnlen(const char *s, size_t maxlen);
346 unsigned int atou(const char *s);
347 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
350 void puts(const char *);
353 void kbd_flush(void);
354 int getchar_timeout(void);
357 void set_video(void);
360 int set_mode(u16 mode);
361 int mode_defined(u16 mode);
362 void probe_cards(int unsafe);
365 void vesa_store_edid(void);
367 #endif /* __ASSEMBLY__ */
369 #endif /* BOOT_BOOT_H */