/arch/x86/boot/boot.h

  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
 32/* Useful macros */
 33#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
 34
 35#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
 36
 37extern struct setup_header hdr;
 38extern struct boot_params boot_params;
 39
 40/* Basic port I/O */
 41static inline void outb(u8 v, u16 port)
 42{
 43	asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
 44}
 45static inline u8 inb(u16 port)
 46{
 47	u8 v;
 48	asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
 49	return v;
 50}
 51
 52static inline void outw(u16 v, u16 port)
 53{
 54	asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
 55}
 56static inline u16 inw(u16 port)
 57{
 58	u16 v;
 59	asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
 60	return v;
 61}
 62
 63static inline void outl(u32 v, u16 port)
 64{
 65	asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
 66}
 67static inline u32 inl(u32 port)
 68{
 69	u32 v;
 70	asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
 71	return v;
 72}
 73
 74static inline void io_delay(void)
 75{
 76	const u16 DELAY_PORT = 0x80;
 77	asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
 78}
 79
 80/* These functions are used to reference data in other segments. */
 81
 82static inline u16 ds(void)
 83{
 84	u16 seg;
 85	asm("movw %%ds,%0" : "=rm" (seg));
 86	return seg;
 87}
 88
 89static inline void set_fs(u16 seg)
 90{
 91	asm volatile("movw %0,%%fs" : : "rm" (seg));
 92}
 93static inline u16 fs(void)
 94{
 95	u16 seg;
 96	asm volatile("movw %%fs,%0" : "=rm" (seg));
 97	return seg;
 98}
 99
100static inline void set_gs(u16 seg)
101{
102	asm volatile("movw %0,%%gs" : : "rm" (seg));
103}
104static inline u16 gs(void)
105{
106	u16 seg;
107	asm volatile("movw %%gs,%0" : "=rm" (seg));
108	return seg;
109}
110
111typedef unsigned int addr_t;
112
113static inline u8 rdfs8(addr_t addr)
114{
115	u8 v;
116	asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
117	return v;
118}
119static inline u16 rdfs16(addr_t addr)
120{
121	u16 v;
122	asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
123	return v;
124}
125static inline u32 rdfs32(addr_t addr)
126{
127	u32 v;
128	asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
129	return v;
130}
131
132static inline void wrfs8(u8 v, addr_t addr)
133{
134	asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
135}
136static inline void wrfs16(u16 v, addr_t addr)
137{
138	asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
139}
140static inline void wrfs32(u32 v, addr_t addr)
141{
142	asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
143}
144
145static inline u8 rdgs8(addr_t addr)
146{
147	u8 v;
148	asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
149	return v;
150}
151static inline u16 rdgs16(addr_t addr)
152{
153	u16 v;
154	asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
155	return v;
156}
157static inline u32 rdgs32(addr_t addr)
158{
159	u32 v;
160	asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
161	return v;
162}
163
164static inline void wrgs8(u8 v, addr_t addr)
165{
166	asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
167}
168static inline void wrgs16(u16 v, addr_t addr)
169{
170	asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
171}
172static inline void wrgs32(u32 v, addr_t addr)
173{
174	asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
175}
176
177/* Note: these only return true/false, not a signed return value! */
178static inline int memcmp(const void *s1, const void *s2, size_t len)
179{
180	u8 diff;
181	asm("repe; cmpsb; setnz %0"
182	    : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
183	return diff;
184}
185
186static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
187{
188	u8 diff;
189	asm volatile("fs; repe; cmpsb; setnz %0"
190		     : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
191	return diff;
192}
193static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
194{
195	u8 diff;
196	asm volatile("gs; repe; cmpsb; setnz %0"
197		     : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
198	return diff;
199}
200
201static inline int isdigit(int ch)
202{
203	return (ch >= '0') && (ch <= '9');
204}
205
206/* Heap -- available for dynamic lists. */
207extern char _end[];
208extern char *HEAP;
209extern char *heap_end;
210#define RESET_HEAP() ((void *)( HEAP = _end ))
211static inline char *__get_heap(size_t s, size_t a, size_t n)
212{
213	char *tmp;
214
215	HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
216	tmp = HEAP;
217	HEAP += s*n;
218	return tmp;
219}
220#define GET_HEAP(type, n) \
221	((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
222
223static inline bool heap_free(size_t n)
224{
225	return (int)(heap_end-HEAP) >= (int)n;
226}
227
228/* copy.S */
229
230void copy_to_fs(addr_t dst, void *src, size_t len);
231void *copy_from_fs(void *dst, addr_t src, size_t len);
232void copy_to_gs(addr_t dst, void *src, size_t len);
233void *copy_from_gs(void *dst, addr_t src, size_t len);
234void *memcpy(void *dst, void *src, size_t len);
235void *memset(void *dst, int c, size_t len);
236
237#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
238#define memset(d,c,l) __builtin_memset(d,c,l)
239
240/* a20.c */
241int enable_a20(void);
242
243/* apm.c */
244int query_apm_bios(void);
245
246/* bioscall.c */
247struct biosregs {
248	union {
249		struct {
250			u32 edi;
251			u32 esi;
252			u32 ebp;
253			u32 _esp;
254			u32 ebx;
255			u32 edx;
256			u32 ecx;
257			u32 eax;
258			u32 _fsgs;
259			u32 _dses;
260			u32 eflags;
261		};
262		struct {
263			u16 di, hdi;
264			u16 si, hsi;
265			u16 bp, hbp;
266			u16 _sp, _hsp;
267			u16 bx, hbx;
268			u16 dx, hdx;
269			u16 cx, hcx;
270			u16 ax, hax;
271			u16 gs, fs;
272			u16 es, ds;
273			u16 flags, hflags;
274		};
275		struct {
276			u8 dil, dih, edi2, edi3;
277			u8 sil, sih, esi2, esi3;
278			u8 bpl, bph, ebp2, ebp3;
279			u8 _spl, _sph, _esp2, _esp3;
280			u8 bl, bh, ebx2, ebx3;
281			u8 dl, dh, edx2, edx3;
282			u8 cl, ch, ecx2, ecx3;
283			u8 al, ah, eax2, eax3;
284		};
285	};
286};
287void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
288
289/* cmdline.c */
290int cmdline_find_option(const char *option, char *buffer, int bufsize);
291int cmdline_find_option_bool(const char *option);
292
293/* cpu.c, cpucheck.c */
294struct cpu_features {
295	int level;		/* Family, or 64 for x86-64 */
296	int model;
297	u32 flags[NCAPINTS];
298};
299extern struct cpu_features cpu;
300int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
301int validate_cpu(void);
302
303/* edd.c */
304void query_edd(void);
305
306/* header.S */
307void __attribute__((noreturn)) die(void);
308
309/* mca.c */
310int query_mca(void);
311
312/* memory.c */
313int detect_memory(void);
314
315/* pm.c */
316void __attribute__((noreturn)) go_to_protected_mode(void);
317
318/* pmjump.S */
319void __attribute__((noreturn))
320	protected_mode_jump(u32 entrypoint, u32 bootparams);
321
322/* printf.c */
323int sprintf(char *buf, const char *fmt, ...);
324int vsprintf(char *buf, const char *fmt, va_list args);
325int printf(const char *fmt, ...);
326
327/* regs.c */
328void initregs(struct biosregs *regs);
329
330/* string.c */
331int strcmp(const char *str1, const char *str2);
332size_t strnlen(const char *s, size_t maxlen);
333unsigned int atou(const char *s);
334
335/* tty.c */
336void puts(const char *);
337void putchar(int);
338int getchar(void);
339void kbd_flush(void);
340int getchar_timeout(void);
341
342/* video.c */
343void set_video(void);
344
345/* video-mode.c */
346int set_mode(u16 mode);
347int mode_defined(u16 mode);
348void probe_cards(int unsafe);
349
350/* video-vesa.c */
351void vesa_store_edid(void);
352
353#endif /* __ASSEMBLY__ */
354
355#endif /* BOOT_BOOT_H */