tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 * Copyright 2009 Intel Corporation; author H. Peter Anvin
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/*
13 * Header file for the real-mode kernel code
14 */
15
16#ifndef BOOT_BOOT_H
17#define BOOT_BOOT_H
18
19#define STACK_SIZE 512 /* Minimum number of bytes for stack */
20
21#ifndef __ASSEMBLY__
22
23#include <stdarg.h>
24#include <linux/types.h>
25#include <linux/edd.h>
26#include <asm/boot.h>
27#include <asm/setup.h>
28#include "bitops.h"
29#include <asm/cpufeature.h>
30#include <asm/processor-flags.h>
31#include "ctype.h"
32
33/* Useful macros */
34#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
35
36#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
37
38extern struct setup_header hdr;
39extern struct boot_params boot_params;
40
41#define cpu_relax() asm volatile("rep; nop")
42
43/* Basic port I/O */
44static inline void outb(u8 v, u16 port)
45{
46 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
47}
48static inline u8 inb(u16 port)
49{
50 u8 v;
51 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
52 return v;
53}
54
55static inline void outw(u16 v, u16 port)
56{
57 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
58}
59static inline u16 inw(u16 port)
60{
61 u16 v;
62 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
63 return v;
64}
65
66static inline void outl(u32 v, u16 port)
67{
68 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
69}
70static inline u32 inl(u16 port)
71{
72 u32 v;
73 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
74 return v;
75}
76
77static inline void io_delay(void)
78{
79 const u16 DELAY_PORT = 0x80;
80 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
81}
82
83/* These functions are used to reference data in other segments. */
84
85static inline u16 ds(void)
86{
87 u16 seg;
88 asm("movw %%ds,%0" : "=rm" (seg));
89 return seg;
90}
91
92static inline void set_fs(u16 seg)
93{
94 asm volatile("movw %0,%%fs" : : "rm" (seg));
95}
96static inline u16 fs(void)
97{
98 u16 seg;
99 asm volatile("movw %%fs,%0" : "=rm" (seg));
100 return seg;
101}
102
103static inline void set_gs(u16 seg)
104{
105 asm volatile("movw %0,%%gs" : : "rm" (seg));
106}
107static inline u16 gs(void)
108{
109 u16 seg;
110 asm volatile("movw %%gs,%0" : "=rm" (seg));
111 return seg;
112}
113
114typedef unsigned int addr_t;
115
116static inline u8 rdfs8(addr_t addr)
117{
118 u8 v;
119 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
120 return v;
121}
122static inline u16 rdfs16(addr_t addr)
123{
124 u16 v;
125 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
126 return v;
127}
128static inline u32 rdfs32(addr_t addr)
129{
130 u32 v;
131 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
132 return v;
133}
134
135static inline void wrfs8(u8 v, addr_t addr)
136{
137 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
138}
139static inline void wrfs16(u16 v, addr_t addr)
140{
141 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
142}
143static inline void wrfs32(u32 v, addr_t addr)
144{
145 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
146}
147
148static inline u8 rdgs8(addr_t addr)
149{
150 u8 v;
151 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
152 return v;
153}
154static inline u16 rdgs16(addr_t addr)
155{
156 u16 v;
157 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
158 return v;
159}
160static inline u32 rdgs32(addr_t addr)
161{
162 u32 v;
163 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
164 return v;
165}
166
167static inline void wrgs8(u8 v, addr_t addr)
168{
169 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
170}
171static inline void wrgs16(u16 v, addr_t addr)
172{
173 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
174}
175static inline void wrgs32(u32 v, addr_t addr)
176{
177 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
178}
179
180/* Note: these only return true/false, not a signed return value! */
181static inline int memcmp(const void *s1, const void *s2, size_t len)
182{
183 u8 diff;
184 asm("repe; cmpsb; setnz %0"
185 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
186 return diff;
187}
188
189static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
190{
191 u8 diff;
192 asm volatile("fs; repe; cmpsb; setnz %0"
193 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
194 return diff;
195}
196static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
197{
198 u8 diff;
199 asm volatile("gs; repe; cmpsb; setnz %0"
200 : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
201 return diff;
202}
203
204/* Heap -- available for dynamic lists. */
205extern char _end[];
206extern char *HEAP;
207extern char *heap_end;
208#define RESET_HEAP() ((void *)( HEAP = _end ))
209static inline char *__get_heap(size_t s, size_t a, size_t n)
210{
211 char *tmp;
212
213 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
214 tmp = HEAP;
215 HEAP += s*n;
216 return tmp;
217}
218#define GET_HEAP(type, n) \
219 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
220
221static inline bool heap_free(size_t n)
222{
223 return (int)(heap_end-HEAP) >= (int)n;
224}
225
226/* copy.S */
227
228void copy_to_fs(addr_t dst, void *src, size_t len);
229void *copy_from_fs(void *dst, addr_t src, size_t len);
230void copy_to_gs(addr_t dst, void *src, size_t len);
231void *copy_from_gs(void *dst, addr_t src, size_t len);
232void *memcpy(void *dst, void *src, size_t len);
233void *memset(void *dst, int c, size_t len);
234
235#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
236#define memset(d,c,l) __builtin_memset(d,c,l)
237
238/* a20.c */
239int enable_a20(void);
240
241/* apm.c */
242int query_apm_bios(void);
243
244/* bioscall.c */
245struct biosregs {
246 union {
247 struct {
248 u32 edi;
249 u32 esi;
250 u32 ebp;
251 u32 _esp;
252 u32 ebx;
253 u32 edx;
254 u32 ecx;
255 u32 eax;
256 u32 _fsgs;
257 u32 _dses;
258 u32 eflags;
259 };
260 struct {
261 u16 di, hdi;
262 u16 si, hsi;
263 u16 bp, hbp;
264 u16 _sp, _hsp;
265 u16 bx, hbx;
266 u16 dx, hdx;
267 u16 cx, hcx;
268 u16 ax, hax;
269 u16 gs, fs;
270 u16 es, ds;
271 u16 flags, hflags;
272 };
273 struct {
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;
282 };
283 };
284};
285void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
286
287/* cmdline.c */
288int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize);
289int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option);
290static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
291{
292 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
293
294 if (cmd_line_ptr >= 0x100000)
295 return -1; /* inaccessible */
296
297 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
298}
299
300static inline int cmdline_find_option_bool(const char *option)
301{
302 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
303
304 if (cmd_line_ptr >= 0x100000)
305 return -1; /* inaccessible */
306
307 return __cmdline_find_option_bool(cmd_line_ptr, option);
308}
309
310
311/* cpu.c, cpucheck.c */
312struct cpu_features {
313 int level; /* Family, or 64 for x86-64 */
314 int model;
315 u32 flags[NCAPINTS];
316};
317extern struct cpu_features cpu;
318int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
319int validate_cpu(void);
320
321/* early_serial_console.c */
322extern int early_serial_base;
323void console_init(void);
324
325/* edd.c */
326void query_edd(void);
327
328/* header.S */
329void __attribute__((noreturn)) die(void);
330
331/* mca.c */
332int query_mca(void);
333
334/* memory.c */
335int detect_memory(void);
336
337/* pm.c */
338void __attribute__((noreturn)) go_to_protected_mode(void);
339
340/* pmjump.S */
341void __attribute__((noreturn))
342 protected_mode_jump(u32 entrypoint, u32 bootparams);
343
344/* printf.c */
345int sprintf(char *buf, const char *fmt, ...);
346int vsprintf(char *buf, const char *fmt, va_list args);
347int printf(const char *fmt, ...);
348
349/* regs.c */
350void initregs(struct biosregs *regs);
351
352/* string.c */
353int strcmp(const char *str1, const char *str2);
354int strncmp(const char *cs, const char *ct, size_t count);
355size_t strnlen(const char *s, size_t maxlen);
356unsigned int atou(const char *s);
357unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
358size_t strlen(const char *s);
359
360/* tty.c */
361void puts(const char *);
362void putchar(int);
363int getchar(void);
364void kbd_flush(void);
365int getchar_timeout(void);
366
367/* video.c */
368void set_video(void);
369
370/* video-mode.c */
371int set_mode(u16 mode);
372int mode_defined(u16 mode);
373void probe_cards(int unsafe);
374
375/* video-vesa.c */
376void vesa_store_edid(void);
377
378#endif /* __ASSEMBLY__ */
379
380#endif /* BOOT_BOOT_H */