1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* -*- linux-c -*- ------------------------------------------------------- *
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright 2007 rPath, Inc. - All Rights Reserved
6 * Copyright 2009 Intel Corporation; author H. Peter Anvin
7 *
8 * ----------------------------------------------------------------------- */
9
10 /*
11 * Header file for the real-mode kernel code
12 */
13
14 #ifndef BOOT_BOOT_H
15 #define BOOT_BOOT_H
16
17 #define STACK_SIZE 1024 /* Minimum number of bytes for stack */
18
19 #ifndef __ASSEMBLY__
20
21 #include <linux/stdarg.h>
22 #include <linux/types.h>
23 #include <linux/edd.h>
24 #include <asm/setup.h>
25 #include <asm/asm.h>
26 #include "bitops.h"
27 #include "ctype.h"
28 #include "cpuflags.h"
29 #include "io.h"
30
31 /* Useful macros */
32 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
33
34 extern struct setup_header hdr;
35 extern struct boot_params boot_params;
36
37 #define cpu_relax() asm volatile("rep; nop")
38
io_delay(void)39 static inline void io_delay(void)
40 {
41 const u16 DELAY_PORT = 0x80;
42 outb(0, DELAY_PORT);
43 }
44
45 /* These functions are used to reference data in other segments. */
46
ds(void)47 static inline u16 ds(void)
48 {
49 u16 seg;
50 asm("movw %%ds,%0" : "=rm" (seg));
51 return seg;
52 }
53
set_fs(u16 seg)54 static inline void set_fs(u16 seg)
55 {
56 asm volatile("movw %0,%%fs" : : "rm" (seg));
57 }
fs(void)58 static inline u16 fs(void)
59 {
60 u16 seg;
61 asm volatile("movw %%fs,%0" : "=rm" (seg));
62 return seg;
63 }
64
set_gs(u16 seg)65 static inline void set_gs(u16 seg)
66 {
67 asm volatile("movw %0,%%gs" : : "rm" (seg));
68 }
gs(void)69 static inline u16 gs(void)
70 {
71 u16 seg;
72 asm volatile("movw %%gs,%0" : "=rm" (seg));
73 return seg;
74 }
75
76 typedef unsigned int addr_t;
77
rdfs8(addr_t addr)78 static inline u8 rdfs8(addr_t addr)
79 {
80 u8 *ptr = (u8 *)absolute_pointer(addr);
81 u8 v;
82 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*ptr));
83 return v;
84 }
rdfs16(addr_t addr)85 static inline u16 rdfs16(addr_t addr)
86 {
87 u16 *ptr = (u16 *)absolute_pointer(addr);
88 u16 v;
89 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
90 return v;
91 }
rdfs32(addr_t addr)92 static inline u32 rdfs32(addr_t addr)
93 {
94 u32 *ptr = (u32 *)absolute_pointer(addr);
95 u32 v;
96 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
97 return v;
98 }
99
wrfs8(u8 v,addr_t addr)100 static inline void wrfs8(u8 v, addr_t addr)
101 {
102 u8 *ptr = (u8 *)absolute_pointer(addr);
103 asm volatile("movb %1,%%fs:%0" : "+m" (*ptr) : "qi" (v));
104 }
wrfs16(u16 v,addr_t addr)105 static inline void wrfs16(u16 v, addr_t addr)
106 {
107 u16 *ptr = (u16 *)absolute_pointer(addr);
108 asm volatile("movw %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
109 }
wrfs32(u32 v,addr_t addr)110 static inline void wrfs32(u32 v, addr_t addr)
111 {
112 u32 *ptr = (u32 *)absolute_pointer(addr);
113 asm volatile("movl %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
114 }
115
rdgs8(addr_t addr)116 static inline u8 rdgs8(addr_t addr)
117 {
118 u8 *ptr = (u8 *)absolute_pointer(addr);
119 u8 v;
120 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*ptr));
121 return v;
122 }
rdgs16(addr_t addr)123 static inline u16 rdgs16(addr_t addr)
124 {
125 u16 *ptr = (u16 *)absolute_pointer(addr);
126 u16 v;
127 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
128 return v;
129 }
rdgs32(addr_t addr)130 static inline u32 rdgs32(addr_t addr)
131 {
132 u32 *ptr = (u32 *)absolute_pointer(addr);
133 u32 v;
134 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
135 return v;
136 }
137
wrgs8(u8 v,addr_t addr)138 static inline void wrgs8(u8 v, addr_t addr)
139 {
140 u8 *ptr = (u8 *)absolute_pointer(addr);
141 asm volatile("movb %1,%%gs:%0" : "+m" (*ptr) : "qi" (v));
142 }
wrgs16(u16 v,addr_t addr)143 static inline void wrgs16(u16 v, addr_t addr)
144 {
145 u16 *ptr = (u16 *)absolute_pointer(addr);
146 asm volatile("movw %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
147 }
wrgs32(u32 v,addr_t addr)148 static inline void wrgs32(u32 v, addr_t addr)
149 {
150 u32 *ptr = (u32 *)absolute_pointer(addr);
151 asm volatile("movl %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
152 }
153
154 /* Note: these only return true/false, not a signed return value! */
memcmp_fs(const void * s1,addr_t s2,size_t len)155 static inline bool memcmp_fs(const void *s1, addr_t s2, size_t len)
156 {
157 bool diff;
158 asm volatile("fs; repe; cmpsb" CC_SET(nz)
159 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
160 return diff;
161 }
memcmp_gs(const void * s1,addr_t s2,size_t len)162 static inline bool memcmp_gs(const void *s1, addr_t s2, size_t len)
163 {
164 bool diff;
165 asm volatile("gs; repe; cmpsb" CC_SET(nz)
166 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
167 return diff;
168 }
169
170 /* Heap -- available for dynamic lists. */
171 extern char _end[];
172 extern char *HEAP;
173 extern char *heap_end;
174 #define RESET_HEAP() ((void *)( HEAP = _end ))
__get_heap(size_t s,size_t a,size_t n)175 static inline char *__get_heap(size_t s, size_t a, size_t n)
176 {
177 char *tmp;
178
179 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
180 tmp = HEAP;
181 HEAP += s*n;
182 return tmp;
183 }
184 #define GET_HEAP(type, n) \
185 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
186
heap_free(size_t n)187 static inline bool heap_free(size_t n)
188 {
189 return (int)(heap_end-HEAP) >= (int)n;
190 }
191
192 /* copy.S */
193
194 void copy_to_fs(addr_t dst, void *src, size_t len);
195 void *copy_from_fs(void *dst, addr_t src, size_t len);
196 void copy_to_gs(addr_t dst, void *src, size_t len);
197 void *copy_from_gs(void *dst, addr_t src, size_t len);
198
199 /* a20.c */
200 int enable_a20(void);
201
202 /* apm.c */
203 int query_apm_bios(void);
204
205 /* bioscall.c */
206 struct biosregs {
207 union {
208 struct {
209 u32 edi;
210 u32 esi;
211 u32 ebp;
212 u32 _esp;
213 u32 ebx;
214 u32 edx;
215 u32 ecx;
216 u32 eax;
217 u32 _fsgs;
218 u32 _dses;
219 u32 eflags;
220 };
221 struct {
222 u16 di, hdi;
223 u16 si, hsi;
224 u16 bp, hbp;
225 u16 _sp, _hsp;
226 u16 bx, hbx;
227 u16 dx, hdx;
228 u16 cx, hcx;
229 u16 ax, hax;
230 u16 gs, fs;
231 u16 es, ds;
232 u16 flags, hflags;
233 };
234 struct {
235 u8 dil, dih, edi2, edi3;
236 u8 sil, sih, esi2, esi3;
237 u8 bpl, bph, ebp2, ebp3;
238 u8 _spl, _sph, _esp2, _esp3;
239 u8 bl, bh, ebx2, ebx3;
240 u8 dl, dh, edx2, edx3;
241 u8 cl, ch, ecx2, ecx3;
242 u8 al, ah, eax2, eax3;
243 };
244 };
245 };
246 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
247
248 /* cmdline.c */
249 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize);
250 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option);
cmdline_find_option(const char * option,char * buffer,int bufsize)251 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
252 {
253 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
254
255 if (cmd_line_ptr >= 0x100000)
256 return -1; /* inaccessible */
257
258 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
259 }
260
cmdline_find_option_bool(const char * option)261 static inline int cmdline_find_option_bool(const char *option)
262 {
263 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
264
265 if (cmd_line_ptr >= 0x100000)
266 return -1; /* inaccessible */
267
268 return __cmdline_find_option_bool(cmd_line_ptr, option);
269 }
270
271 /* cpu.c, cpucheck.c */
272 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
273 int check_knl_erratum(void);
274 int validate_cpu(void);
275
276 /* early_serial_console.c */
277 extern int early_serial_base;
278 void console_init(void);
279
280 /* edd.c */
281 void query_edd(void);
282
283 /* header.S */
284 void __attribute__((noreturn)) die(void);
285
286 /* memory.c */
287 void detect_memory(void);
288
289 /* pm.c */
290 void __attribute__((noreturn)) go_to_protected_mode(void);
291
292 /* pmjump.S */
293 void __attribute__((noreturn))
294 protected_mode_jump(u32 entrypoint, u32 bootparams);
295
296 /* printf.c */
297 int sprintf(char *buf, const char *fmt, ...);
298 int vsprintf(char *buf, const char *fmt, va_list args);
299 int printf(const char *fmt, ...);
300
301 /* regs.c */
302 void initregs(struct biosregs *regs);
303
304 /* string.c */
305 int strcmp(const char *str1, const char *str2);
306 int strncmp(const char *cs, const char *ct, size_t count);
307 size_t strnlen(const char *s, size_t maxlen);
308 unsigned int atou(const char *s);
309 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
310 size_t strlen(const char *s);
311 char *strchr(const char *s, int c);
312
313 /* tty.c */
314 void puts(const char *);
315 void putchar(int);
316 int getchar(void);
317 void kbd_flush(void);
318 int getchar_timeout(void);
319
320 /* video.c */
321 void set_video(void);
322
323 /* video-mode.c */
324 int set_mode(u16 mode);
325 int mode_defined(u16 mode);
326 void probe_cards(int unsafe);
327
328 /* video-vesa.c */
329 void vesa_store_edid(void);
330
331 #endif /* __ASSEMBLY__ */
332
333 #endif /* BOOT_BOOT_H */
334