/* SPDX-License-Identifier: GPL-2.0-only */ /* -*- linux-c -*- ------------------------------------------------------- * * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright 2007 rPath, Inc. - All Rights Reserved * Copyright 2009 Intel Corporation; author H. Peter Anvin * * ----------------------------------------------------------------------- */ /* * Header file for the real-mode kernel code */ #ifndef BOOT_BOOT_H #define BOOT_BOOT_H #define STACK_SIZE 1024 /* Minimum number of bytes for stack */ #ifndef __ASSEMBLY__ #include <stdarg.h> #include <linux/types.h> #include <linux/edd.h> #include <asm/setup.h> #include <asm/asm.h> #include "bitops.h" #include "ctype.h" #include "cpuflags.h" /* Useful macros */ #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) extern struct setup_header hdr; extern struct boot_params boot_params; #define cpu_relax() asm volatile("rep; nop") /* Basic port I/O */ static inline void outb(u8 v, u16 port) { asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); } static inline u8 inb(u16 port) { u8 v; asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); return v; } static inline void outw(u16 v, u16 port) { asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); } static inline u16 inw(u16 port) { u16 v; asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); return v; } static inline void outl(u32 v, u16 port) { asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); } static inline u32 inl(u16 port) { u32 v; asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); return v; } static inline void io_delay(void) { const u16 DELAY_PORT = 0x80; asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); } /* These functions are used to reference data in other segments. */ static inline u16 ds(void) { u16 seg; asm("movw %%ds,%0" : "=rm" (seg)); return seg; } static inline void set_fs(u16 seg) { asm volatile("movw %0,%%fs" : : "rm" (seg)); } static inline u16 fs(void) { u16 seg; asm volatile("movw %%fs,%0" : "=rm" (seg)); return seg; } static inline void set_gs(u16 seg) { asm volatile("movw %0,%%gs" : : "rm" (seg)); } static inline u16 gs(void) { u16 seg; asm volatile("movw %%gs,%0" : "=rm" (seg)); return seg; } typedef unsigned int addr_t; static inline u8 rdfs8(addr_t addr) { u8 v; asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); return v; } static inline u16 rdfs16(addr_t addr) { u16 v; asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); return v; } static inline u32 rdfs32(addr_t addr) { u32 v; asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); return v; } static inline void wrfs8(u8 v, addr_t addr) { asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); } static inline void wrfs16(u16 v, addr_t addr) { asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); } static inline void wrfs32(u32 v, addr_t addr) { asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); } static inline u8 rdgs8(addr_t addr) { u8 v; asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr)); return v; } static inline u16 rdgs16(addr_t addr) { u16 v; asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); return v; } static inline u32 rdgs32(addr_t addr) { u32 v; asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); return v; } static inline void wrgs8(u8 v, addr_t addr) { asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v)); } static inline void wrgs16(u16 v, addr_t addr) { asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v)); } static inline void wrgs32(u32 v, addr_t addr) { asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v)); } /* Note: these only return true/false, not a signed return value! */ static inline bool memcmp_fs(const void *s1, addr_t s2, size_t len) { bool diff; asm volatile("fs; repe; cmpsb" CC_SET(nz) : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len)); return diff; } static inline bool memcmp_gs(const void *s1, addr_t s2, size_t len) { bool diff; asm volatile("gs; repe; cmpsb" CC_SET(nz) : CC_OUT(nz) (diff), "+D" (s1), "+S" (s2), "+c" (len)); return diff; } /* Heap -- available for dynamic lists. */ extern char _end[]; extern char *HEAP; extern char *heap_end; #define RESET_HEAP() ((void *)( HEAP = _end )) static inline char *__get_heap(size_t s, size_t a, size_t n) { char *tmp; HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); tmp = HEAP; HEAP += s*n; return tmp; } #define GET_HEAP(type, n) \ ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) static inline bool heap_free(size_t n) { return (int)(heap_end-HEAP) >= (int)n; } /* copy.S */ void copy_to_fs(addr_t dst, void *src, size_t len); void *copy_from_fs(void *dst, addr_t src, size_t len); void copy_to_gs(addr_t dst, void *src, size_t len); void *copy_from_gs(void *dst, addr_t src, size_t len); /* a20.c */ int enable_a20(void); /* apm.c */ int query_apm_bios(void); /* bioscall.c */ struct biosregs { union { struct { u32 edi; u32 esi; u32 ebp; u32 _esp; u32 ebx; u32 edx; u32 ecx; u32 eax; u32 _fsgs; u32 _dses; u32 eflags; }; struct { u16 di, hdi; u16 si, hsi; u16 bp, hbp; u16 _sp, _hsp; u16 bx, hbx; u16 dx, hdx; u16 cx, hcx; u16 ax, hax; u16 gs, fs; u16 es, ds; u16 flags, hflags; }; struct { u8 dil, dih, edi2, edi3; u8 sil, sih, esi2, esi3; u8 bpl, bph, ebp2, ebp3; u8 _spl, _sph, _esp2, _esp3; u8 bl, bh, ebx2, ebx3; u8 dl, dh, edx2, edx3; u8 cl, ch, ecx2, ecx3; u8 al, ah, eax2, eax3; }; }; }; void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg); /* cmdline.c */ int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize); int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option); static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) { unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; if (cmd_line_ptr >= 0x100000) return -1; /* inaccessible */ return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); } static inline int cmdline_find_option_bool(const char *option) { unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; if (cmd_line_ptr >= 0x100000) return -1; /* inaccessible */ return __cmdline_find_option_bool(cmd_line_ptr, option); } /* cpu.c, cpucheck.c */ int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); int check_knl_erratum(void); int validate_cpu(void); /* early_serial_console.c */ extern int early_serial_base; void console_init(void); /* edd.c */ void query_edd(void); /* header.S */ void __attribute__((noreturn)) die(void); /* memory.c */ void detect_memory(void); /* pm.c */ void __attribute__((noreturn)) go_to_protected_mode(void); /* pmjump.S */ void __attribute__((noreturn)) protected_mode_jump(u32 entrypoint, u32 bootparams); /* printf.c */ int sprintf(char *buf, const char *fmt, ...); int vsprintf(char *buf, const char *fmt, va_list args); int printf(const char *fmt, ...); /* regs.c */ void initregs(struct biosregs *regs); /* string.c */ int strcmp(const char *str1, const char *str2); int strncmp(const char *cs, const char *ct, size_t count); size_t strnlen(const char *s, size_t maxlen); unsigned int atou(const char *s); unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); size_t strlen(const char *s); char *strchr(const char *s, int c); /* tty.c */ void puts(const char *); void putchar(int); int getchar(void); void kbd_flush(void); int getchar_timeout(void); /* video.c */ void set_video(void); /* video-mode.c */ int set_mode(u16 mode); int mode_defined(u16 mode); void probe_cards(int unsafe); /* video-vesa.c */ void vesa_store_edid(void); #endif /* __ASSEMBLY__ */ #endif /* BOOT_BOOT_H */