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 */
21 #include <linux/stdarg.h>
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)
114 asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
117 static inline u16 rdfs16(addr_t addr)
120 asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
123 static inline u32 rdfs32(addr_t addr)
126 asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
130 static inline void wrfs8(u8 v, addr_t addr)
132 asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
134 static inline void wrfs16(u16 v, addr_t addr)
136 asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
138 static inline void wrfs32(u32 v, addr_t addr)
140 asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
143 static inline u8 rdgs8(addr_t addr)
146 asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
149 static inline u16 rdgs16(addr_t addr)
152 asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
155 static inline u32 rdgs32(addr_t addr)
158 asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
162 static inline void wrgs8(u8 v, addr_t addr)
164 asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
166 static inline void wrgs16(u16 v, addr_t addr)
168 asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
170 static inline void wrgs32(u32 v, addr_t addr)
172 asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
175 /* Note: these only return true/false, not a signed return value! */
176 static inline bool memcmp_fs(const void *s1, addr_t s2, size_t len)
179 asm volatile("fs; repe; cmpsb" CC_SET(nz)
180 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
183 static inline bool memcmp_gs(const void *s1, addr_t s2, size_t len)
186 asm volatile("gs; repe; cmpsb" CC_SET(nz)
187 : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len));
191 /* Heap -- available for dynamic lists. */
194 extern char *heap_end;
195 #define RESET_HEAP() ((void *)( HEAP = _end ))
196 static inline char *__get_heap(size_t s, size_t a, size_t n)
200 HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
205 #define GET_HEAP(type, n) \
206 ((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
208 static inline bool heap_free(size_t n)
210 return (int)(heap_end-HEAP) >= (int)n;
215 void copy_to_fs(addr_t dst, void *src, size_t len);
216 void *copy_from_fs(void *dst, addr_t src, size_t len);
217 void copy_to_gs(addr_t dst, void *src, size_t len);
218 void *copy_from_gs(void *dst, addr_t src, size_t len);
221 int enable_a20(void);
224 int query_apm_bios(void);
256 u8 dil, dih, edi2, edi3;
257 u8 sil, sih, esi2, esi3;
258 u8 bpl, bph, ebp2, ebp3;
259 u8 _spl, _sph, _esp2, _esp3;
260 u8 bl, bh, ebx2, ebx3;
261 u8 dl, dh, edx2, edx3;
262 u8 cl, ch, ecx2, ecx3;
263 u8 al, ah, eax2, eax3;
267 void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
270 int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize);
271 int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option);
272 static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)
274 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
276 if (cmd_line_ptr >= 0x100000)
277 return -1; /* inaccessible */
279 return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize);
282 static inline int cmdline_find_option_bool(const char *option)
284 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
286 if (cmd_line_ptr >= 0x100000)
287 return -1; /* inaccessible */
289 return __cmdline_find_option_bool(cmd_line_ptr, option);
292 /* cpu.c, cpucheck.c */
293 int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
294 int check_knl_erratum(void);
295 int validate_cpu(void);
297 /* early_serial_console.c */
298 extern int early_serial_base;
299 void console_init(void);
302 void query_edd(void);
305 void __attribute__((noreturn)) die(void);
308 void detect_memory(void);
311 void __attribute__((noreturn)) go_to_protected_mode(void);
314 void __attribute__((noreturn))
315 protected_mode_jump(u32 entrypoint, u32 bootparams);
318 int sprintf(char *buf, const char *fmt, ...);
319 int vsprintf(char *buf, const char *fmt, va_list args);
320 int printf(const char *fmt, ...);
323 void initregs(struct biosregs *regs);
326 int strcmp(const char *str1, const char *str2);
327 int strncmp(const char *cs, const char *ct, size_t count);
328 size_t strnlen(const char *s, size_t maxlen);
329 unsigned int atou(const char *s);
330 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
331 size_t strlen(const char *s);
332 char *strchr(const char *s, int c);
335 void puts(const char *);
338 void kbd_flush(void);
339 int getchar_timeout(void);
342 void set_video(void);
345 int set_mode(u16 mode);
346 int mode_defined(u16 mode);
347 void probe_cards(int unsafe);
350 void vesa_store_edid(void);
352 #endif /* __ASSEMBLY__ */
354 #endif /* BOOT_BOOT_H */