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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> | |
26 | #include <asm/boot.h> | |
fa76dab9 | 27 | #include <asm/setup.h> |
c2dcfde8 | 28 | #include "bitops.h" |
6238b47b | 29 | #include "ctype.h" |
dd78b973 | 30 | #include "cpuflags.h" |
7b27718b | 31 | |
62bd0337 PA |
32 | /* Useful macros */ |
33 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) | |
34 | ||
1b72691c AK |
35 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
36 | ||
62bd0337 PA |
37 | extern struct setup_header hdr; |
38 | extern struct boot_params boot_params; | |
39 | ||
fa97bdf9 PE |
40 | #define cpu_relax() asm volatile("rep; nop") |
41 | ||
62bd0337 PA |
42 | /* Basic port I/O */ |
43 | static inline void outb(u8 v, u16 port) | |
44 | { | |
45 | asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); | |
46 | } | |
47 | static inline u8 inb(u16 port) | |
48 | { | |
49 | u8 v; | |
50 | asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); | |
51 | return v; | |
52 | } | |
53 | ||
54 | static inline void outw(u16 v, u16 port) | |
55 | { | |
56 | asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); | |
57 | } | |
58 | static inline u16 inw(u16 port) | |
59 | { | |
60 | u16 v; | |
61 | asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); | |
62 | return v; | |
63 | } | |
64 | ||
65 | static inline void outl(u32 v, u16 port) | |
66 | { | |
5593eaa8 | 67 | asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); |
62bd0337 | 68 | } |
35f1790e | 69 | static inline u32 inl(u16 port) |
62bd0337 PA |
70 | { |
71 | u32 v; | |
72 | asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); | |
73 | return v; | |
74 | } | |
75 | ||
76 | static inline void io_delay(void) | |
77 | { | |
78 | const u16 DELAY_PORT = 0x80; | |
79 | asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); | |
80 | } | |
81 | ||
82 | /* These functions are used to reference data in other segments. */ | |
83 | ||
84 | static inline u16 ds(void) | |
85 | { | |
86 | u16 seg; | |
87 | asm("movw %%ds,%0" : "=rm" (seg)); | |
88 | return seg; | |
89 | } | |
90 | ||
91 | static inline void set_fs(u16 seg) | |
92 | { | |
93 | asm volatile("movw %0,%%fs" : : "rm" (seg)); | |
94 | } | |
95 | static inline u16 fs(void) | |
96 | { | |
97 | u16 seg; | |
b015124e | 98 | asm volatile("movw %%fs,%0" : "=rm" (seg)); |
62bd0337 PA |
99 | return seg; |
100 | } | |
101 | ||
102 | static inline void set_gs(u16 seg) | |
103 | { | |
104 | asm volatile("movw %0,%%gs" : : "rm" (seg)); | |
105 | } | |
106 | static inline u16 gs(void) | |
107 | { | |
108 | u16 seg; | |
b015124e | 109 | asm volatile("movw %%gs,%0" : "=rm" (seg)); |
62bd0337 PA |
110 | return seg; |
111 | } | |
112 | ||
113 | typedef unsigned int addr_t; | |
114 | ||
115 | static inline u8 rdfs8(addr_t addr) | |
116 | { | |
117 | u8 v; | |
811a0fff | 118 | asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); |
62bd0337 PA |
119 | return v; |
120 | } | |
121 | static inline u16 rdfs16(addr_t addr) | |
122 | { | |
123 | u16 v; | |
b015124e | 124 | asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); |
62bd0337 PA |
125 | return v; |
126 | } | |
127 | static inline u32 rdfs32(addr_t addr) | |
128 | { | |
129 | u32 v; | |
b015124e | 130 | asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); |
62bd0337 PA |
131 | return v; |
132 | } | |
133 | ||
134 | static inline void wrfs8(u8 v, addr_t addr) | |
135 | { | |
811a0fff | 136 | asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); |
62bd0337 PA |
137 | } |
138 | static inline void wrfs16(u16 v, addr_t addr) | |
139 | { | |
811a0fff | 140 | asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); |
62bd0337 PA |
141 | } |
142 | static inline void wrfs32(u32 v, addr_t addr) | |
143 | { | |
811a0fff | 144 | asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); |
62bd0337 PA |
145 | } |
146 | ||
147 | static inline u8 rdgs8(addr_t addr) | |
148 | { | |
149 | u8 v; | |
811a0fff | 150 | asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); |
62bd0337 PA |
151 | return v; |
152 | } | |
153 | static inline u16 rdgs16(addr_t addr) | |
154 | { | |
155 | u16 v; | |
b015124e | 156 | asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); |
62bd0337 PA |
157 | return v; |
158 | } | |
159 | static inline u32 rdgs32(addr_t addr) | |
160 | { | |
161 | u32 v; | |
b015124e | 162 | asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); |
62bd0337 PA |
163 | return v; |
164 | } | |
165 | ||
166 | static inline void wrgs8(u8 v, addr_t addr) | |
167 | { | |
811a0fff | 168 | asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); |
62bd0337 PA |
169 | } |
170 | static inline void wrgs16(u16 v, addr_t addr) | |
171 | { | |
811a0fff | 172 | asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); |
62bd0337 PA |
173 | } |
174 | static inline void wrgs32(u32 v, addr_t addr) | |
175 | { | |
811a0fff | 176 | asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); |
62bd0337 PA |
177 | } |
178 | ||
179 | /* Note: these only return true/false, not a signed return value! */ | |
62bd0337 PA |
180 | static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) |
181 | { | |
182 | u8 diff; | |
b015124e PA |
183 | asm volatile("fs; repe; cmpsb; setnz %0" |
184 | : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); | |
62bd0337 PA |
185 | return diff; |
186 | } | |
187 | static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) | |
188 | { | |
189 | u8 diff; | |
b015124e PA |
190 | asm volatile("gs; repe; cmpsb; setnz %0" |
191 | : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); | |
62bd0337 PA |
192 | return diff; |
193 | } | |
194 | ||
62bd0337 | 195 | /* Heap -- available for dynamic lists. */ |
62bd0337 PA |
196 | extern char _end[]; |
197 | extern char *HEAP; | |
198 | extern char *heap_end; | |
199 | #define RESET_HEAP() ((void *)( HEAP = _end )) | |
200 | static inline char *__get_heap(size_t s, size_t a, size_t n) | |
201 | { | |
202 | char *tmp; | |
203 | ||
204 | HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); | |
205 | tmp = HEAP; | |
206 | HEAP += s*n; | |
207 | return tmp; | |
208 | } | |
209 | #define GET_HEAP(type, n) \ | |
210 | ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) | |
211 | ||
e6e1ace9 | 212 | static inline bool heap_free(size_t n) |
62bd0337 | 213 | { |
e6e1ace9 | 214 | return (int)(heap_end-HEAP) >= (int)n; |
62bd0337 PA |
215 | } |
216 | ||
217 | /* copy.S */ | |
218 | ||
219 | void copy_to_fs(addr_t dst, void *src, size_t len); | |
220 | void *copy_from_fs(void *dst, addr_t src, size_t len); | |
221 | void copy_to_gs(addr_t dst, void *src, size_t len); | |
222 | void *copy_from_gs(void *dst, addr_t src, size_t len); | |
62bd0337 PA |
223 | |
224 | /* a20.c */ | |
225 | int enable_a20(void); | |
226 | ||
227 | /* apm.c */ | |
228 | int query_apm_bios(void); | |
229 | ||
7a734e7d PA |
230 | /* bioscall.c */ |
231 | struct biosregs { | |
232 | union { | |
233 | struct { | |
234 | u32 edi; | |
235 | u32 esi; | |
236 | u32 ebp; | |
237 | u32 _esp; | |
238 | u32 ebx; | |
239 | u32 edx; | |
240 | u32 ecx; | |
241 | u32 eax; | |
242 | u32 _fsgs; | |
243 | u32 _dses; | |
244 | u32 eflags; | |
245 | }; | |
246 | struct { | |
247 | u16 di, hdi; | |
248 | u16 si, hsi; | |
249 | u16 bp, hbp; | |
250 | u16 _sp, _hsp; | |
251 | u16 bx, hbx; | |
252 | u16 dx, hdx; | |
253 | u16 cx, hcx; | |
254 | u16 ax, hax; | |
255 | u16 gs, fs; | |
256 | u16 es, ds; | |
257 | u16 flags, hflags; | |
258 | }; | |
259 | struct { | |
260 | u8 dil, dih, edi2, edi3; | |
261 | u8 sil, sih, esi2, esi3; | |
262 | u8 bpl, bph, ebp2, ebp3; | |
263 | u8 _spl, _sph, _esp2, _esp3; | |
264 | u8 bl, bh, ebx2, ebx3; | |
265 | u8 dl, dh, edx2, edx3; | |
266 | u8 cl, ch, ecx2, ecx3; | |
267 | u8 al, ah, eax2, eax3; | |
268 | }; | |
269 | }; | |
270 | }; | |
271 | void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); | |
272 | ||
62bd0337 | 273 | /* cmdline.c */ |
3db07e70 YL |
274 | int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); |
275 | int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); | |
f4ed2877 YL |
276 | static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) |
277 | { | |
3db07e70 | 278 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; |
16a4baa6 YL |
279 | |
280 | if (cmd_line_ptr >= 0x100000) | |
281 | return -1; /* inaccessible */ | |
282 | ||
283 | return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); | |
f4ed2877 YL |
284 | } |
285 | ||
286 | static inline int cmdline_find_option_bool(const char *option) | |
287 | { | |
3db07e70 | 288 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; |
16a4baa6 YL |
289 | |
290 | if (cmd_line_ptr >= 0x100000) | |
291 | return -1; /* inaccessible */ | |
292 | ||
293 | return __cmdline_find_option_bool(cmd_line_ptr, option); | |
f4ed2877 YL |
294 | } |
295 | ||
62bd0337 PA |
296 | /* cpu.c, cpucheck.c */ |
297 | int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); | |
298 | int validate_cpu(void); | |
299 | ||
f4ed2877 YL |
300 | /* early_serial_console.c */ |
301 | extern int early_serial_base; | |
302 | void console_init(void); | |
303 | ||
62bd0337 PA |
304 | /* edd.c */ |
305 | void query_edd(void); | |
306 | ||
307 | /* header.S */ | |
308 | void __attribute__((noreturn)) die(void); | |
309 | ||
310 | /* mca.c */ | |
311 | int query_mca(void); | |
312 | ||
313 | /* memory.c */ | |
314 | int detect_memory(void); | |
315 | ||
316 | /* pm.c */ | |
317 | void __attribute__((noreturn)) go_to_protected_mode(void); | |
318 | ||
319 | /* pmjump.S */ | |
320 | void __attribute__((noreturn)) | |
321 | protected_mode_jump(u32 entrypoint, u32 bootparams); | |
322 | ||
323 | /* printf.c */ | |
324 | int sprintf(char *buf, const char *fmt, ...); | |
325 | int vsprintf(char *buf, const char *fmt, va_list args); | |
326 | int printf(const char *fmt, ...); | |
327 | ||
7a734e7d PA |
328 | /* regs.c */ |
329 | void initregs(struct biosregs *regs); | |
330 | ||
62bd0337 PA |
331 | /* string.c */ |
332 | int strcmp(const char *str1, const char *str2); | |
fa97bdf9 | 333 | int strncmp(const char *cs, const char *ct, size_t count); |
62bd0337 PA |
334 | size_t strnlen(const char *s, size_t maxlen); |
335 | unsigned int atou(const char *s); | |
fa97bdf9 | 336 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); |
062fe8fe | 337 | size_t strlen(const char *s); |
62bd0337 PA |
338 | |
339 | /* tty.c */ | |
340 | void puts(const char *); | |
341 | void putchar(int); | |
342 | int getchar(void); | |
343 | void kbd_flush(void); | |
344 | int getchar_timeout(void); | |
345 | ||
346 | /* video.c */ | |
347 | void set_video(void); | |
348 | ||
e44b7b75 PM |
349 | /* video-mode.c */ |
350 | int set_mode(u16 mode); | |
351 | int mode_defined(u16 mode); | |
352 | void probe_cards(int unsafe); | |
353 | ||
62bd0337 PA |
354 | /* video-vesa.c */ |
355 | void vesa_store_edid(void); | |
356 | ||
62bd0337 PA |
357 | #endif /* __ASSEMBLY__ */ |
358 | ||
359 | #endif /* BOOT_BOOT_H */ |