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