1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* -*- linux-c -*- ------------------------------------------------------- *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright 2007 rPath, Inc. - All Rights Reserved
6 * Copyright 2009 Intel Corporation; author H. Peter Anvin
8 * ----------------------------------------------------------------------- */
11 * Header file for the real-mode kernel code
17 #define STACK_SIZE 1024 /* Minimum number of bytes for stack */
22 #include <linux/types.h>
23 #include <linux/edd.h>
24 #include <asm/setup.h>
31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
33 extern struct setup_header hdr;
34 extern struct boot_params boot_params;
36 #define cpu_relax() asm volatile("rep; nop")
39 static inline void outb(u8 v, u16 port)
41 asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
43 static inline u8 inb(u16 port)
46 asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
50 static inline void outw(u16 v, u16 port)
52 asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
54 static inline u16 inw(u16 port)
57 asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
61 static inline void outl(u32 v, u16 port)
63 asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
65 static inline u32 inl(u16 port)
68 asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
72 static inline void io_delay(void)
74 const u16 DELAY_PORT = 0x80;
75 asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
78 /* These functions are used to reference data in other segments. */
80 static inline u16 ds(void)
83 asm("movw %%ds,%0" : "=rm" (seg));
87 static inline void set_fs(u16 seg)
89 asm volatile("movw %0,%%fs" : : "rm" (seg));
91 static inline u16 fs(void)
94 asm volatile("movw %%fs,%0" : "=rm" (seg));
98 static inline void set_gs(u16 seg)
100 asm volatile("movw %0,%%gs" : : "rm" (seg));
102 static inline u16 gs(void)
105 asm volatile("movw %%gs,%0" : "=rm" (seg));
109 typedef unsigned int addr_t;
111 static inline u8 rdfs8(addr_t addr)
113 u8 *ptr = (u8 *)absolute_pointer(addr);
115 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*ptr));
118 static inline u16 rdfs16(addr_t addr)
120 u16 *ptr = (u16 *)absolute_pointer(addr);
122 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
125 static inline u32 rdfs32(addr_t addr)
127 u32 *ptr = (u32 *)absolute_pointer(addr);
129 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
133 static inline void wrfs8(u8 v, addr_t addr)
135 u8 *ptr = (u8 *)absolute_pointer(addr);
136 asm volatile("movb %1,%%fs:%0" : "+m" (*ptr) : "qi" (v));
138 static inline void wrfs16(u16 v, addr_t addr)
140 u16 *ptr = (u16 *)absolute_pointer(addr);
141 asm volatile("movw %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
143 static inline void wrfs32(u32 v, addr_t addr)
145 u32 *ptr = (u32 *)absolute_pointer(addr);
146 asm volatile("movl %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
149 static inline u8 rdgs8(addr_t addr)
151 u8 *ptr = (u8 *)absolute_pointer(addr);
153 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*ptr));
156 static inline u16 rdgs16(addr_t addr)
158 u16 *ptr = (u16 *)absolute_pointer(addr);
160 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
163 static inline u32 rdgs32(addr_t addr)
165 u32 *ptr = (u32 *)absolute_pointer(addr);
167 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
171 static inline void wrgs8(u8 v, addr_t addr)
173 u8 *ptr = (u8 *)absolute_pointer(addr);
174 asm volatile("movb %1,%%gs:%0" : "+m" (*ptr) : "qi" (v));
176 static inline void wrgs16(u16 v, addr_t addr)
178 u16 *ptr = (u16 *)absolute_pointer(addr);
179 asm volatile("movw %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
181 static inline void wrgs32(u32 v, addr_t addr)
183 u32 *ptr = (u32 *)absolute_pointer(addr);
184 asm volatile("movl %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
187 /* Note: these only return true/false, not a signed return value! */
188 static inline bool memcmp_fs(const void *s1, addr_t s2, size_t len)
191 asm volatile("fs; repe; cmpsb" CC_SET(nz)
192 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
195 static inline bool memcmp_gs(const void *s1, addr_t s2, size_t len)
198 asm volatile("gs; repe; cmpsb" CC_SET(nz)
199 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
203 /* Heap -- available for dynamic lists. */
206 extern char *heap_end;
207 #define RESET_HEAP() ((void *)( HEAP = _end ))
208 static inline char *__get_heap(size_t s, size_t a, size_t n)
212 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
217 #define GET_HEAP(type, n) \
218 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
220 static inline bool heap_free(size_t n)
222 return (int)(heap_end-HEAP) >= (int)n;
227 void copy_to_fs(addr_t dst, void *src, size_t len);
228 void *copy_from_fs(void *dst, addr_t src, size_t len);
229 void copy_to_gs(addr_t dst, void *src, size_t len);
230 void *copy_from_gs(void *dst, addr_t src, size_t len);
233 int enable_a20(void);
236 int query_apm_bios(void);
268 u8 dil, dih, edi2, edi3;
269 u8 sil, sih, esi2, esi3;
270 u8 bpl, bph, ebp2, ebp3;
271 u8 _spl, _sph, _esp2, _esp3;
272 u8 bl, bh, ebx2, ebx3;
273 u8 dl, dh, edx2, edx3;
274 u8 cl, ch, ecx2, ecx3;
275 u8 al, ah, eax2, eax3;
279 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
282 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize);
283 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option);
284 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
286 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
288 if (cmd_line_ptr >= 0x100000)
289 return -1; /* inaccessible */
291 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
294 static inline int cmdline_find_option_bool(const char *option)
296 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
298 if (cmd_line_ptr >= 0x100000)
299 return -1; /* inaccessible */
301 return __cmdline_find_option_bool(cmd_line_ptr, option);
304 /* cpu.c, cpucheck.c */
305 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
306 int check_knl_erratum(void);
307 int validate_cpu(void);
309 /* early_serial_console.c */
310 extern int early_serial_base;
311 void console_init(void);
314 void query_edd(void);
317 void __attribute__((noreturn)) die(void);
320 void detect_memory(void);
323 void __attribute__((noreturn)) go_to_protected_mode(void);
326 void __attribute__((noreturn))
327 protected_mode_jump(u32 entrypoint, u32 bootparams);
330 int sprintf(char *buf, const char *fmt, ...);
331 int vsprintf(char *buf, const char *fmt, va_list args);
332 int printf(const char *fmt, ...);
335 void initregs(struct biosregs *regs);
338 int strcmp(const char *str1, const char *str2);
339 int strncmp(const char *cs, const char *ct, size_t count);
340 size_t strnlen(const char *s, size_t maxlen);
341 unsigned int atou(const char *s);
342 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
343 size_t strlen(const char *s);
344 char *strchr(const char *s, int c);
347 void puts(const char *);
350 void kbd_flush(void);
351 int getchar_timeout(void);
354 void set_video(void);
357 int set_mode(u16 mode);
358 int mode_defined(u16 mode);
359 void probe_cards(int unsafe);
362 void vesa_store_edid(void);
364 #endif /* __ASSEMBLY__ */
366 #endif /* BOOT_BOOT_H */