| /* 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 <linux/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 *ptr = (u8 *)absolute_pointer(addr); |
| u8 v; |
| asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*ptr)); |
| return v; |
| } |
| static inline u16 rdfs16(addr_t addr) |
| { |
| u16 *ptr = (u16 *)absolute_pointer(addr); |
| u16 v; |
| asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*ptr)); |
| return v; |
| } |
| static inline u32 rdfs32(addr_t addr) |
| { |
| u32 *ptr = (u32 *)absolute_pointer(addr); |
| u32 v; |
| asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*ptr)); |
| return v; |
| } |
| |
| static inline void wrfs8(u8 v, addr_t addr) |
| { |
| u8 *ptr = (u8 *)absolute_pointer(addr); |
| asm volatile("movb %1,%%fs:%0" : "+m" (*ptr) : "qi" (v)); |
| } |
| static inline void wrfs16(u16 v, addr_t addr) |
| { |
| u16 *ptr = (u16 *)absolute_pointer(addr); |
| asm volatile("movw %1,%%fs:%0" : "+m" (*ptr) : "ri" (v)); |
| } |
| static inline void wrfs32(u32 v, addr_t addr) |
| { |
| u32 *ptr = (u32 *)absolute_pointer(addr); |
| asm volatile("movl %1,%%fs:%0" : "+m" (*ptr) : "ri" (v)); |
| } |
| |
| static inline u8 rdgs8(addr_t addr) |
| { |
| u8 *ptr = (u8 *)absolute_pointer(addr); |
| u8 v; |
| asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*ptr)); |
| return v; |
| } |
| static inline u16 rdgs16(addr_t addr) |
| { |
| u16 *ptr = (u16 *)absolute_pointer(addr); |
| u16 v; |
| asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*ptr)); |
| return v; |
| } |
| static inline u32 rdgs32(addr_t addr) |
| { |
| u32 *ptr = (u32 *)absolute_pointer(addr); |
| u32 v; |
| asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*ptr)); |
| return v; |
| } |
| |
| static inline void wrgs8(u8 v, addr_t addr) |
| { |
| u8 *ptr = (u8 *)absolute_pointer(addr); |
| asm volatile("movb %1,%%gs:%0" : "+m" (*ptr) : "qi" (v)); |
| } |
| static inline void wrgs16(u16 v, addr_t addr) |
| { |
| u16 *ptr = (u16 *)absolute_pointer(addr); |
| asm volatile("movw %1,%%gs:%0" : "+m" (*ptr) : "ri" (v)); |
| } |
| static inline void wrgs32(u32 v, addr_t addr) |
| { |
| u32 *ptr = (u32 *)absolute_pointer(addr); |
| asm volatile("movl %1,%%gs:%0" : "+m" (*ptr) : "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 */ |