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x86 setup: handle boot loaders which set up the stack incorrectly
[deliverable/linux.git] / arch / x86 / boot / boot.h
CommitLineData
62bd0337
PA		 1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 *
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.
8 *
9 * ----------------------------------------------------------------------- */
10
11/*
12 * arch/i386/boot/boot.h
13 *
14 * Header file for the real-mode kernel code
15 */
16
17#ifndef BOOT_BOOT_H
18#define BOOT_BOOT_H
19
6b6815c6
PA		 20#define STACK_SIZE 512 /* Minimum number of bytes for stack */
21
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PA		 22#ifndef __ASSEMBLY__
23
24#include <stdarg.h>
25#include <linux/types.h>
26#include <linux/edd.h>
27#include <asm/boot.h>
fa76dab9 28#include <asm/setup.h>
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PA		 29
30/* Useful macros */
31#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
32
33extern struct setup_header hdr;
34extern struct boot_params boot_params;
35
36/* Basic port I/O */
37static inline void outb(u8 v, u16 port)
38{
39 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
40}
41static inline u8 inb(u16 port)
42{
43 u8 v;
44 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
45 return v;
46}
47
48static inline void outw(u16 v, u16 port)
49{
50 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
51}
52static inline u16 inw(u16 port)
53{
54 u16 v;
55 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
56 return v;
57}
58
59static inline void outl(u32 v, u16 port)
60{
5593eaa8 61 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
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PA		 62}
63static inline u32 inl(u32 port)
64{
65 u32 v;
66 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
67 return v;
68}
69
70static inline void io_delay(void)
71{
72 const u16 DELAY_PORT = 0x80;
73 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
74}
75
76/* These functions are used to reference data in other segments. */
77
78static inline u16 ds(void)
79{
80 u16 seg;
81 asm("movw %%ds,%0" : "=rm" (seg));
82 return seg;
83}
84
85static inline void set_fs(u16 seg)
86{
87 asm volatile("movw %0,%%fs" : : "rm" (seg));
88}
89static inline u16 fs(void)
90{
91 u16 seg;
b015124e 92 asm volatile("movw %%fs,%0" : "=rm" (seg));
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PA		 93 return seg;
94}
95
96static inline void set_gs(u16 seg)
97{
98 asm volatile("movw %0,%%gs" : : "rm" (seg));
99}
100static inline u16 gs(void)
101{
102 u16 seg;
b015124e 103 asm volatile("movw %%gs,%0" : "=rm" (seg));
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PA		 104 return seg;
105}
106
107typedef unsigned int addr_t;
108
109static inline u8 rdfs8(addr_t addr)
110{
111 u8 v;
b015124e 112 asm volatile("movb %%fs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
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PA		 113 return v;
114}
115static inline u16 rdfs16(addr_t addr)
116{
117 u16 v;
b015124e 118 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
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PA		 119 return v;
120}
121static inline u32 rdfs32(addr_t addr)
122{
123 u32 v;
b015124e 124 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
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PA		 125 return v;
126}
127
128static inline void wrfs8(u8 v, addr_t addr)
129{
130 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "r" (v));
131}
132static inline void wrfs16(u16 v, addr_t addr)
133{
134 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "r" (v));
135}
136static inline void wrfs32(u32 v, addr_t addr)
137{
138 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "r" (v));
139}
140
141static inline u8 rdgs8(addr_t addr)
142{
143 u8 v;
b015124e 144 asm volatile("movb %%gs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
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PA		 145 return v;
146}
147static inline u16 rdgs16(addr_t addr)
148{
149 u16 v;
b015124e 150 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
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PA		 151 return v;
152}
153static inline u32 rdgs32(addr_t addr)
154{
155 u32 v;
b015124e 156 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
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PA		 157 return v;
158}
159
160static inline void wrgs8(u8 v, addr_t addr)
161{
162 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "r" (v));
163}
164static inline void wrgs16(u16 v, addr_t addr)
165{
166 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "r" (v));
167}
168static inline void wrgs32(u32 v, addr_t addr)
169{
170 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "r" (v));
171}
172
173/* Note: these only return true/false, not a signed return value! */
174static inline int memcmp(const void *s1, const void *s2, size_t len)
175{
176 u8 diff;
177 asm("repe; cmpsb; setnz %0"
178 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
179 return diff;
180}
181
182static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
183{
184 u8 diff;
b015124e
PA		 185 asm volatile("fs; repe; cmpsb; setnz %0"
186 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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PA		 187 return diff;
188}
189static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
190{
191 u8 diff;
b015124e
PA		 192 asm volatile("gs; repe; cmpsb; setnz %0"
193 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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PA		 194 return diff;
195}
196
197static inline int isdigit(int ch)
198{
199 return (ch >= '0') && (ch <= '9');
200}
201
202/* Heap -- available for dynamic lists. */
62bd0337
PA		 203extern char _end[];
204extern char *HEAP;
205extern char *heap_end;
206#define RESET_HEAP() ((void *)( HEAP = _end ))
207static inline char *__get_heap(size_t s, size_t a, size_t n)
208{
209 char *tmp;
210
211 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
212 tmp = HEAP;
213 HEAP += s*n;
214 return tmp;
215}
216#define GET_HEAP(type, n) \
217 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
218
219static inline int heap_free(void)
220{
221 return heap_end-HEAP;
222}
223
224/* copy.S */
225
226void copy_to_fs(addr_t dst, void *src, size_t len);
227void *copy_from_fs(void *dst, addr_t src, size_t len);
228void copy_to_gs(addr_t dst, void *src, size_t len);
229void *copy_from_gs(void *dst, addr_t src, size_t len);
230void *memcpy(void *dst, void *src, size_t len);
231void *memset(void *dst, int c, size_t len);
232
233#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
234#define memset(d,c,l) __builtin_memset(d,c,l)
235
236/* a20.c */
237int enable_a20(void);
238
239/* apm.c */
240int query_apm_bios(void);
241
242/* cmdline.c */
243int cmdline_find_option(const char *option, char *buffer, int bufsize);
244
245/* cpu.c, cpucheck.c */
246int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
247int validate_cpu(void);
248
249/* edd.c */
250void query_edd(void);
251
252/* header.S */
253void __attribute__((noreturn)) die(void);
254
255/* mca.c */
256int query_mca(void);
257
258/* memory.c */
259int detect_memory(void);
260
261/* pm.c */
262void __attribute__((noreturn)) go_to_protected_mode(void);
263
264/* pmjump.S */
265void __attribute__((noreturn))
266 protected_mode_jump(u32 entrypoint, u32 bootparams);
267
268/* printf.c */
269int sprintf(char *buf, const char *fmt, ...);
270int vsprintf(char *buf, const char *fmt, va_list args);
271int printf(const char *fmt, ...);
272
273/* string.c */
274int strcmp(const char *str1, const char *str2);
275size_t strnlen(const char *s, size_t maxlen);
276unsigned int atou(const char *s);
277
278/* tty.c */
279void puts(const char *);
280void putchar(int);
281int getchar(void);
282void kbd_flush(void);
283int getchar_timeout(void);
284
285/* video.c */
286void set_video(void);
287
288/* video-vesa.c */
289void vesa_store_edid(void);
290
291/* voyager.c */
292int query_voyager(void);
293
294#endif /* __ASSEMBLY__ */
295
296#endif /* BOOT_BOOT_H */
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