/* -*- linux-c -*- ------------------------------------------------------- * * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright 2007 rPath, Inc. - All Rights Reserved * * This file is part of the Linux kernel, and is made available under * the terms of the GNU General Public License version 2. * * ----------------------------------------------------------------------- */ /* * Header file for the real-mode kernel code */ #ifndef BOOT_BOOT_H #define BOOT_BOOT_H #define STACK_SIZE 512 /* Minimum number of bytes for stack */ #ifndef __ASSEMBLY__ #include <stdarg.h> #include <linux/types.h> #include <linux/edd.h> #include <asm/boot.h> #include <asm/setup.h> #include "bitops.h" #include <asm/cpufeature.h> /* Useful macros */ #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) extern struct setup_header hdr; extern struct boot_params boot_params; /* 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(u32 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 int memcmp(const void *s1, const void *s2, size_t len) { u8 diff; asm("repe; cmpsb; setnz %0" : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); return diff; } static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) { u8 diff; asm volatile("fs; repe; cmpsb; setnz %0" : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); return diff; } static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) { u8 diff; asm volatile("gs; repe; cmpsb; setnz %0" : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); return diff; } static inline int isdigit(int ch) { return (ch >= '0') && (ch <= '9'); } /* 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); void *memcpy(void *dst, void *src, size_t len); void *memset(void *dst, int c, size_t len); #define memcpy(d,s,l) __builtin_memcpy(d,s,l) #define memset(d,c,l) __builtin_memset(d,c,l) /* a20.c */ int enable_a20(void); /* apm.c */ int query_apm_bios(void); /* cmdline.c */ int cmdline_find_option(const char *option, char *buffer, int bufsize); int cmdline_find_option_bool(const char *option); /* cpu.c, cpucheck.c */ struct cpu_features { int level; /* Family, or 64 for x86-64 */ int model; u32 flags[NCAPINTS]; }; extern struct cpu_features cpu; int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); int validate_cpu(void); /* edd.c */ void query_edd(void); /* header.S */ void __attribute__((noreturn)) die(void); /* mca.c */ int query_mca(void); /* memory.c */ int 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, ...); /* string.c */ int strcmp(const char *str1, const char *str2); size_t strnlen(const char *s, size_t maxlen); unsigned int atou(const char *s); /* 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); /* voyager.c */ int query_voyager(void); #endif /* __ASSEMBLY__ */ #endif /* BOOT_BOOT_H */