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62bd0337 PA |
1 | /* -*- linux-c -*- ------------------------------------------------------- * |
2 | * | |
3 | * Copyright (C) 1991, 1992 Linus Torvalds | |
4 | * Copyright 2007 rPath, Inc. - All Rights Reserved | |
7a734e7d | 5 | * Copyright 2009 Intel Corporation; author H. Peter Anvin |
62bd0337 PA |
6 | * |
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. | |
9 | * | |
10 | * ----------------------------------------------------------------------- */ | |
11 | ||
12 | /* | |
62bd0337 PA |
13 | * Header file for the real-mode kernel code |
14 | */ | |
15 | ||
16 | #ifndef BOOT_BOOT_H | |
17 | #define BOOT_BOOT_H | |
18 | ||
6b6815c6 PA |
19 | #define STACK_SIZE 512 /* Minimum number of bytes for stack */ |
20 | ||
62bd0337 PA |
21 | #ifndef __ASSEMBLY__ |
22 | ||
23 | #include <stdarg.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/edd.h> | |
fa76dab9 | 26 | #include <asm/setup.h> |
c2dcfde8 | 27 | #include "bitops.h" |
6238b47b | 28 | #include "ctype.h" |
dd78b973 | 29 | #include "cpuflags.h" |
7b27718b | 30 | |
62bd0337 PA |
31 | /* Useful macros */ |
32 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) | |
33 | ||
1b72691c AK |
34 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
35 | ||
62bd0337 PA |
36 | extern struct setup_header hdr; |
37 | extern struct boot_params boot_params; | |
38 | ||
fa97bdf9 PE |
39 | #define cpu_relax() asm volatile("rep; nop") |
40 | ||
62bd0337 PA |
41 | /* Basic port I/O */ |
42 | static inline void outb(u8 v, u16 port) | |
43 | { | |
44 | asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); | |
45 | } | |
46 | static inline u8 inb(u16 port) | |
47 | { | |
48 | u8 v; | |
49 | asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); | |
50 | return v; | |
51 | } | |
52 | ||
53 | static inline void outw(u16 v, u16 port) | |
54 | { | |
55 | asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); | |
56 | } | |
57 | static inline u16 inw(u16 port) | |
58 | { | |
59 | u16 v; | |
60 | asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); | |
61 | return v; | |
62 | } | |
63 | ||
64 | static inline void outl(u32 v, u16 port) | |
65 | { | |
5593eaa8 | 66 | asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); |
62bd0337 | 67 | } |
35f1790e | 68 | static inline u32 inl(u16 port) |
62bd0337 PA |
69 | { |
70 | u32 v; | |
71 | asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); | |
72 | return v; | |
73 | } | |
74 | ||
75 | static inline void io_delay(void) | |
76 | { | |
77 | const u16 DELAY_PORT = 0x80; | |
78 | asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); | |
79 | } | |
80 | ||
81 | /* These functions are used to reference data in other segments. */ | |
82 | ||
83 | static inline u16 ds(void) | |
84 | { | |
85 | u16 seg; | |
86 | asm("movw %%ds,%0" : "=rm" (seg)); | |
87 | return seg; | |
88 | } | |
89 | ||
90 | static inline void set_fs(u16 seg) | |
91 | { | |
92 | asm volatile("movw %0,%%fs" : : "rm" (seg)); | |
93 | } | |
94 | static inline u16 fs(void) | |
95 | { | |
96 | u16 seg; | |
b015124e | 97 | asm volatile("movw %%fs,%0" : "=rm" (seg)); |
62bd0337 PA |
98 | return seg; |
99 | } | |
100 | ||
101 | static inline void set_gs(u16 seg) | |
102 | { | |
103 | asm volatile("movw %0,%%gs" : : "rm" (seg)); | |
104 | } | |
105 | static inline u16 gs(void) | |
106 | { | |
107 | u16 seg; | |
b015124e | 108 | asm volatile("movw %%gs,%0" : "=rm" (seg)); |
62bd0337 PA |
109 | return seg; |
110 | } | |
111 | ||
112 | typedef unsigned int addr_t; | |
113 | ||
114 | static inline u8 rdfs8(addr_t addr) | |
115 | { | |
116 | u8 v; | |
811a0fff | 117 | asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); |
62bd0337 PA |
118 | return v; |
119 | } | |
120 | static inline u16 rdfs16(addr_t addr) | |
121 | { | |
122 | u16 v; | |
b015124e | 123 | asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); |
62bd0337 PA |
124 | return v; |
125 | } | |
126 | static inline u32 rdfs32(addr_t addr) | |
127 | { | |
128 | u32 v; | |
b015124e | 129 | asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); |
62bd0337 PA |
130 | return v; |
131 | } | |
132 | ||
133 | static inline void wrfs8(u8 v, addr_t addr) | |
134 | { | |
811a0fff | 135 | asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); |
62bd0337 PA |
136 | } |
137 | static inline void wrfs16(u16 v, addr_t addr) | |
138 | { | |
811a0fff | 139 | asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); |
62bd0337 PA |
140 | } |
141 | static inline void wrfs32(u32 v, addr_t addr) | |
142 | { | |
811a0fff | 143 | asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); |
62bd0337 PA |
144 | } |
145 | ||
146 | static inline u8 rdgs8(addr_t addr) | |
147 | { | |
148 | u8 v; | |
811a0fff | 149 | asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); |
62bd0337 PA |
150 | return v; |
151 | } | |
152 | static inline u16 rdgs16(addr_t addr) | |
153 | { | |
154 | u16 v; | |
b015124e | 155 | asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); |
62bd0337 PA |
156 | return v; |
157 | } | |
158 | static inline u32 rdgs32(addr_t addr) | |
159 | { | |
160 | u32 v; | |
b015124e | 161 | asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); |
62bd0337 PA |
162 | return v; |
163 | } | |
164 | ||
165 | static inline void wrgs8(u8 v, addr_t addr) | |
166 | { | |
811a0fff | 167 | asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); |
62bd0337 PA |
168 | } |
169 | static inline void wrgs16(u16 v, addr_t addr) | |
170 | { | |
811a0fff | 171 | asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); |
62bd0337 PA |
172 | } |
173 | static inline void wrgs32(u32 v, addr_t addr) | |
174 | { | |
811a0fff | 175 | asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); |
62bd0337 PA |
176 | } |
177 | ||
178 | /* Note: these only return true/false, not a signed return value! */ | |
62bd0337 PA |
179 | static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) |
180 | { | |
181 | u8 diff; | |
b015124e PA |
182 | asm volatile("fs; repe; cmpsb; setnz %0" |
183 | : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); | |
62bd0337 PA |
184 | return diff; |
185 | } | |
186 | static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) | |
187 | { | |
188 | u8 diff; | |
b015124e PA |
189 | asm volatile("gs; repe; cmpsb; setnz %0" |
190 | : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); | |
62bd0337 PA |
191 | return diff; |
192 | } | |
193 | ||
62bd0337 | 194 | /* Heap -- available for dynamic lists. */ |
62bd0337 PA |
195 | extern char _end[]; |
196 | extern char *HEAP; | |
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) | |
200 | { | |
201 | char *tmp; | |
202 | ||
203 | HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); | |
204 | tmp = HEAP; | |
205 | HEAP += s*n; | |
206 | return tmp; | |
207 | } | |
208 | #define GET_HEAP(type, n) \ | |
209 | ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) | |
210 | ||
e6e1ace9 | 211 | static inline bool heap_free(size_t n) |
62bd0337 | 212 | { |
e6e1ace9 | 213 | return (int)(heap_end-HEAP) >= (int)n; |
62bd0337 PA |
214 | } |
215 | ||
216 | /* copy.S */ | |
217 | ||
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); | |
62bd0337 PA |
222 | |
223 | /* a20.c */ | |
224 | int enable_a20(void); | |
225 | ||
226 | /* apm.c */ | |
227 | int query_apm_bios(void); | |
228 | ||
7a734e7d PA |
229 | /* bioscall.c */ |
230 | struct biosregs { | |
231 | union { | |
232 | struct { | |
233 | u32 edi; | |
234 | u32 esi; | |
235 | u32 ebp; | |
236 | u32 _esp; | |
237 | u32 ebx; | |
238 | u32 edx; | |
239 | u32 ecx; | |
240 | u32 eax; | |
241 | u32 _fsgs; | |
242 | u32 _dses; | |
243 | u32 eflags; | |
244 | }; | |
245 | struct { | |
246 | u16 di, hdi; | |
247 | u16 si, hsi; | |
248 | u16 bp, hbp; | |
249 | u16 _sp, _hsp; | |
250 | u16 bx, hbx; | |
251 | u16 dx, hdx; | |
252 | u16 cx, hcx; | |
253 | u16 ax, hax; | |
254 | u16 gs, fs; | |
255 | u16 es, ds; | |
256 | u16 flags, hflags; | |
257 | }; | |
258 | struct { | |
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; | |
267 | }; | |
268 | }; | |
269 | }; | |
270 | void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); | |
271 | ||
62bd0337 | 272 | /* cmdline.c */ |
3db07e70 YL |
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); | |
f4ed2877 YL |
275 | static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) |
276 | { | |
3db07e70 | 277 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; |
16a4baa6 YL |
278 | |
279 | if (cmd_line_ptr >= 0x100000) | |
280 | return -1; /* inaccessible */ | |
281 | ||
282 | return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); | |
f4ed2877 YL |
283 | } |
284 | ||
285 | static inline int cmdline_find_option_bool(const char *option) | |
286 | { | |
3db07e70 | 287 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; |
16a4baa6 YL |
288 | |
289 | if (cmd_line_ptr >= 0x100000) | |
290 | return -1; /* inaccessible */ | |
291 | ||
292 | return __cmdline_find_option_bool(cmd_line_ptr, option); | |
f4ed2877 YL |
293 | } |
294 | ||
62bd0337 PA |
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); | |
298 | ||
f4ed2877 YL |
299 | /* early_serial_console.c */ |
300 | extern int early_serial_base; | |
301 | void console_init(void); | |
302 | ||
62bd0337 PA |
303 | /* edd.c */ |
304 | void query_edd(void); | |
305 | ||
306 | /* header.S */ | |
307 | void __attribute__((noreturn)) die(void); | |
308 | ||
62bd0337 PA |
309 | /* memory.c */ |
310 | int detect_memory(void); | |
311 | ||
312 | /* pm.c */ | |
313 | void __attribute__((noreturn)) go_to_protected_mode(void); | |
314 | ||
315 | /* pmjump.S */ | |
316 | void __attribute__((noreturn)) | |
317 | protected_mode_jump(u32 entrypoint, u32 bootparams); | |
318 | ||
319 | /* printf.c */ | |
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, ...); | |
323 | ||
7a734e7d PA |
324 | /* regs.c */ |
325 | void initregs(struct biosregs *regs); | |
326 | ||
62bd0337 PA |
327 | /* string.c */ |
328 | int strcmp(const char *str1, const char *str2); | |
fa97bdf9 | 329 | int strncmp(const char *cs, const char *ct, size_t count); |
62bd0337 PA |
330 | size_t strnlen(const char *s, size_t maxlen); |
331 | unsigned int atou(const char *s); | |
fa97bdf9 | 332 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); |
062fe8fe | 333 | size_t strlen(const char *s); |
62bd0337 PA |
334 | |
335 | /* tty.c */ | |
336 | void puts(const char *); | |
337 | void putchar(int); | |
338 | int getchar(void); | |
339 | void kbd_flush(void); | |
340 | int getchar_timeout(void); | |
341 | ||
342 | /* video.c */ | |
343 | void set_video(void); | |
344 | ||
e44b7b75 PM |
345 | /* video-mode.c */ |
346 | int set_mode(u16 mode); | |
347 | int mode_defined(u16 mode); | |
348 | void probe_cards(int unsafe); | |
349 | ||
62bd0337 PA |
350 | /* video-vesa.c */ |
351 | void vesa_store_edid(void); | |
352 | ||
62bd0337 PA |
353 | #endif /* __ASSEMBLY__ */ |
354 | ||
355 | #endif /* BOOT_BOOT_H */ |