x86, setup: Allow global variables and functions in the decompressor
[deliverable/linux.git] / arch / x86 / boot / boot.h
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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
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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/*
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13 * Header file for the real-mode kernel code
14 */
15
16#ifndef BOOT_BOOT_H
17#define BOOT_BOOT_H
18
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19#define STACK_SIZE 512 /* Minimum number of bytes for stack */
20
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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>
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28#include "bitops.h"
29#include <asm/cpufeature.h>
7a734e7d 30#include <asm/processor-flags.h>
7b27718b 31
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32/* Useful macros */
33#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
34
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35#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
36
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37extern struct setup_header hdr;
38extern struct boot_params boot_params;
39
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40#define cpu_relax() asm volatile("rep; nop")
41
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42/* Basic port I/O */
43static inline void outb(u8 v, u16 port)
44{
45 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
46}
47static inline u8 inb(u16 port)
48{
49 u8 v;
50 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
51 return v;
52}
53
54static inline void outw(u16 v, u16 port)
55{
56 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
57}
58static inline u16 inw(u16 port)
59{
60 u16 v;
61 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
62 return v;
63}
64
65static inline void outl(u32 v, u16 port)
66{
5593eaa8 67 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
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68}
69static inline u32 inl(u32 port)
70{
71 u32 v;
72 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
73 return v;
74}
75
76static 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
84static inline u16 ds(void)
85{
86 u16 seg;
87 asm("movw %%ds,%0" : "=rm" (seg));
88 return seg;
89}
90
91static inline void set_fs(u16 seg)
92{
93 asm volatile("movw %0,%%fs" : : "rm" (seg));
94}
95static inline u16 fs(void)
96{
97 u16 seg;
b015124e 98 asm volatile("movw %%fs,%0" : "=rm" (seg));
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99 return seg;
100}
101
102static inline void set_gs(u16 seg)
103{
104 asm volatile("movw %0,%%gs" : : "rm" (seg));
105}
106static inline u16 gs(void)
107{
108 u16 seg;
b015124e 109 asm volatile("movw %%gs,%0" : "=rm" (seg));
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110 return seg;
111}
112
113typedef unsigned int addr_t;
114
115static inline u8 rdfs8(addr_t addr)
116{
117 u8 v;
811a0fff 118 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
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119 return v;
120}
121static inline u16 rdfs16(addr_t addr)
122{
123 u16 v;
b015124e 124 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
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125 return v;
126}
127static inline u32 rdfs32(addr_t addr)
128{
129 u32 v;
b015124e 130 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
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131 return v;
132}
133
134static inline void wrfs8(u8 v, addr_t addr)
135{
811a0fff 136 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
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137}
138static inline void wrfs16(u16 v, addr_t addr)
139{
811a0fff 140 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
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141}
142static inline void wrfs32(u32 v, addr_t addr)
143{
811a0fff 144 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
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145}
146
147static inline u8 rdgs8(addr_t addr)
148{
149 u8 v;
811a0fff 150 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
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151 return v;
152}
153static inline u16 rdgs16(addr_t addr)
154{
155 u16 v;
b015124e 156 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
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157 return v;
158}
159static inline u32 rdgs32(addr_t addr)
160{
161 u32 v;
b015124e 162 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
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163 return v;
164}
165
166static inline void wrgs8(u8 v, addr_t addr)
167{
811a0fff 168 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
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169}
170static inline void wrgs16(u16 v, addr_t addr)
171{
811a0fff 172 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
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173}
174static inline void wrgs32(u32 v, addr_t addr)
175{
811a0fff 176 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
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177}
178
179/* Note: these only return true/false, not a signed return value! */
180static inline int memcmp(const void *s1, const void *s2, size_t len)
181{
182 u8 diff;
183 asm("repe; cmpsb; setnz %0"
184 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
185 return diff;
186}
187
188static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
189{
190 u8 diff;
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191 asm volatile("fs; repe; cmpsb; setnz %0"
192 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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193 return diff;
194}
195static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
196{
197 u8 diff;
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198 asm volatile("gs; repe; cmpsb; setnz %0"
199 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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200 return diff;
201}
202
203static inline int isdigit(int ch)
204{
205 return (ch >= '0') && (ch <= '9');
206}
207
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208static inline int isxdigit(int ch)
209{
210 if (isdigit(ch))
211 return true;
212
213 if ((ch >= 'a') && (ch <= 'f'))
214 return true;
215
216 return (ch >= 'A') && (ch <= 'F');
217}
218
62bd0337 219/* Heap -- available for dynamic lists. */
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220extern char _end[];
221extern char *HEAP;
222extern char *heap_end;
223#define RESET_HEAP() ((void *)( HEAP = _end ))
224static inline char *__get_heap(size_t s, size_t a, size_t n)
225{
226 char *tmp;
227
228 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
229 tmp = HEAP;
230 HEAP += s*n;
231 return tmp;
232}
233#define GET_HEAP(type, n) \
234 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
235
e6e1ace9 236static inline bool heap_free(size_t n)
62bd0337 237{
e6e1ace9 238 return (int)(heap_end-HEAP) >= (int)n;
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239}
240
241/* copy.S */
242
243void copy_to_fs(addr_t dst, void *src, size_t len);
244void *copy_from_fs(void *dst, addr_t src, size_t len);
245void copy_to_gs(addr_t dst, void *src, size_t len);
246void *copy_from_gs(void *dst, addr_t src, size_t len);
247void *memcpy(void *dst, void *src, size_t len);
248void *memset(void *dst, int c, size_t len);
249
250#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
251#define memset(d,c,l) __builtin_memset(d,c,l)
252
253/* a20.c */
254int enable_a20(void);
255
256/* apm.c */
257int query_apm_bios(void);
258
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259/* bioscall.c */
260struct biosregs {
261 union {
262 struct {
263 u32 edi;
264 u32 esi;
265 u32 ebp;
266 u32 _esp;
267 u32 ebx;
268 u32 edx;
269 u32 ecx;
270 u32 eax;
271 u32 _fsgs;
272 u32 _dses;
273 u32 eflags;
274 };
275 struct {
276 u16 di, hdi;
277 u16 si, hsi;
278 u16 bp, hbp;
279 u16 _sp, _hsp;
280 u16 bx, hbx;
281 u16 dx, hdx;
282 u16 cx, hcx;
283 u16 ax, hax;
284 u16 gs, fs;
285 u16 es, ds;
286 u16 flags, hflags;
287 };
288 struct {
289 u8 dil, dih, edi2, edi3;
290 u8 sil, sih, esi2, esi3;
291 u8 bpl, bph, ebp2, ebp3;
292 u8 _spl, _sph, _esp2, _esp3;
293 u8 bl, bh, ebx2, ebx3;
294 u8 dl, dh, edx2, edx3;
295 u8 cl, ch, ecx2, ecx3;
296 u8 al, ah, eax2, eax3;
297 };
298 };
299};
300void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
301
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302/* cmdline.c */
303int cmdline_find_option(const char *option, char *buffer, int bufsize);
70d8abf5 304int cmdline_find_option_bool(const char *option);
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305
306/* cpu.c, cpucheck.c */
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307struct cpu_features {
308 int level; /* Family, or 64 for x86-64 */
309 int model;
310 u32 flags[NCAPINTS];
311};
312extern struct cpu_features cpu;
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313int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
314int validate_cpu(void);
315
316/* edd.c */
317void query_edd(void);
318
319/* header.S */
320void __attribute__((noreturn)) die(void);
321
322/* mca.c */
323int query_mca(void);
324
325/* memory.c */
326int detect_memory(void);
327
328/* pm.c */
329void __attribute__((noreturn)) go_to_protected_mode(void);
330
331/* pmjump.S */
332void __attribute__((noreturn))
333 protected_mode_jump(u32 entrypoint, u32 bootparams);
334
335/* printf.c */
336int sprintf(char *buf, const char *fmt, ...);
337int vsprintf(char *buf, const char *fmt, va_list args);
338int printf(const char *fmt, ...);
339
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340/* regs.c */
341void initregs(struct biosregs *regs);
342
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343/* string.c */
344int strcmp(const char *str1, const char *str2);
fa97bdf9 345int strncmp(const char *cs, const char *ct, size_t count);
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346size_t strnlen(const char *s, size_t maxlen);
347unsigned int atou(const char *s);
fa97bdf9 348unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
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349
350/* tty.c */
fa97bdf9 351void console_init(void);
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352void puts(const char *);
353void putchar(int);
354int getchar(void);
355void kbd_flush(void);
356int getchar_timeout(void);
357
358/* video.c */
359void set_video(void);
360
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361/* video-mode.c */
362int set_mode(u16 mode);
363int mode_defined(u16 mode);
364void probe_cards(int unsafe);
365
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366/* video-vesa.c */
367void vesa_store_edid(void);
368
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369#endif /* __ASSEMBLY__ */
370
371#endif /* BOOT_BOOT_H */
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