mirror of
https://github.com/DragonOS-Community/DragonOS.git
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371 lines
9.1 KiB
C
371 lines
9.1 KiB
C
//
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// 内核全局通用库
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// Created by longjin on 2022/1/22.
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//
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#pragma once
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//引入对bool类型的支持
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#include <stdbool.h>
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#define NULL 0
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#define sti() __asm__ __volatile__("sti\n\t" :: \
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: "memory") //开启外部中断
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#define cli() __asm__ __volatile__("cli\n\t" :: \
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: "memory") //关闭外部中断
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#define nop() __asm__ __volatile__("nop\n\t")
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//内存屏障
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#define io_mfence() __asm__ __volatile__("mfence\n\t" :: \
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: "memory") // 在mfence指令前的读写操作必须在mfence指令后的读写操作前完成。
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#define io_sfence() __asm__ __volatile__("sfence\n\t" :: \
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: "memory") // 在sfence指令前的写操作必须在sfence指令后的写操作前完成
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#define io_lfence() __asm__ __volatile__("lfence\n\t" :: \
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: "memory") // 在lfence指令前的读操作必须在lfence指令后的读操作前完成。
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/**
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* @brief 根据结构体变量内某个成员变量member的基地址，计算出该结构体变量的基地址
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* @param ptr 指向结构体变量内的成员变量member的指针
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* @param type 成员变量所在的结构体
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* @param member 成员变量名
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*
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* 方法：使用ptr减去结构体内的偏移，得到结构体变量的基地址
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*/
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#define container_of(ptr, type, member) \
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({ \
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typeof(((type *)0)->member) *p = (ptr); \
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(type *)((unsigned long)p - (unsigned long)&(((type *)0)->member)); \
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})
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// 定义类型的缩写
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typedef unsigned long ul;
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typedef unsigned long long int ull;
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typedef long long int ll;
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#define ABS(x) ((x) > 0 ? (x) : -(x)) // 绝对值
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// 四舍五入成整数
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ul round(double x)
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{
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return (ul)(x + 0.5);
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}
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/**
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* @brief 地址按照align进行对齐
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*
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* @param addr
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* @param _align
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* @return ul 对齐后的地址
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*/
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ul ALIGN(const ul addr, const ul _align)
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{
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return (ul)((addr+_align-1)&(~(_align-1)));
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}
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//链表数据结构
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struct List
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{
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struct List *prev, *next;
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};
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//初始化循环链表
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static inline void list_init(struct List *list)
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{
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list->next = list;
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list->prev = list;
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}
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/**
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* @brief
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* @param entry 给定的节点
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* @param node 待插入的节点
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**/
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static inline void list_add(struct List *entry, struct List *node)
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{
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node->next = entry->next;
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node->prev = entry;
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node->next->prev = node;
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entry->next = node;
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}
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static inline void list_append(struct List *entry, struct List *node)
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{
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/**
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* @brief 将node添加到给定的list的结尾(也就是当前节点的前面)
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* @param entry 列表的入口
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* @param node 待添加的节点
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*/
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struct List *tail = entry->prev;
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list_add(tail, node);
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}
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static inline void list_del(struct List *entry)
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{
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/**
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* @brief 从列表中删除节点
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* @param entry 待删除的节点
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*/
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entry->prev->next = entry->next;
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entry->next = entry->prev;
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}
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static inline bool list_empty(struct List *entry)
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{
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/**
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* @brief 判断循环链表是否为空
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* @param entry 入口
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*/
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if (entry->prev == entry->next)
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return true;
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else
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return false;
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}
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/**
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* @brief 获取链表的上一个元素
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*
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* @param entry
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* @return 链表的上一个元素
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*/
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static inline struct List *list_prev(struct List *entry)
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{
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if (entry->prev != NULL)
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return entry->prev;
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else
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return NULL;
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}
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/**
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* @brief 获取链表的下一个元素
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*
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* @param entry
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* @return 链表的下一个元素
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*/
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static inline struct List *list_next(struct List *entry)
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{
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if (entry->next != NULL)
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return entry->next;
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else
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return NULL;
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}
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//计算字符串的长度（经过测试，该版本比采用repne/scasb汇编的运行速度快16.8%左右）
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static inline int strlen(char *s)
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{
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register int __res = 0;
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while (s[__res] != '\0')
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{
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++__res;
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}
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return __res;
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}
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void *memset(void *dst, unsigned char C, ul Count)
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{
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int d0, d1;
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unsigned long tmp = C * 0x0101010101010101UL;
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__asm__ __volatile__("cld \n\t"
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"rep \n\t"
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"stosq \n\t"
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"testb $4, %b3 \n\t"
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"je 1f \n\t"
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"stosl \n\t"
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"1:\ttestb $2, %b3 \n\t"
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"je 2f\n\t"
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"stosw \n\t"
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"2:\ttestb $1, %b3 \n\t"
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"je 3f \n\t"
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"stosb \n\t"
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"3: \n\t"
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: "=&c"(d0), "=&D"(d1)
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: "a"(tmp), "q"(Count), "0"(Count / 8), "1"(dst)
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: "memory");
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return dst;
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}
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/**
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* @brief 内存拷贝函数
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*
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* @param dst 目标数组
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* @param src 源数组
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* @param Num 字节数
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* @return void*
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*/
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void *memcpy(void *dst, void *src, long Num)
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{
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int d0, d1, d2;
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__asm__ __volatile__("cld \n\t"
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"rep \n\t"
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"movsq \n\t"
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"testb $4,%b4 \n\t"
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"je 1f \n\t"
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"movsl \n\t"
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"1:\ttestb $2,%b4 \n\t"
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"je 2f \n\t"
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"movsw \n\t"
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"2:\ttestb $1,%b4 \n\t"
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"je 3f \n\t"
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"movsb \n\t"
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"3: \n\t"
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: "=&c"(d0), "=&D"(d1), "=&S"(d2)
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: "0"(Num / 8), "q"(Num), "1"(dst), "2"(src)
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: "memory");
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return dst;
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}
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void *memset_c(void *dst, unsigned char c, ul n)
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{
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unsigned char *s = (unsigned char *)dst;
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for (int i = 0; i < n; ++i)
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s[i] = c;
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return dst;
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}
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// 从io口读入8个bit
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unsigned char io_in8(unsigned short port)
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{
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unsigned char ret = 0;
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__asm__ __volatile__("inb %%dx, %0 \n\t"
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"mfence \n\t"
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: "=a"(ret)
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: "d"(port)
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: "memory");
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return ret;
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}
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// 从io口读入32个bit
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unsigned int io_in32(unsigned short port)
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{
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unsigned int ret = 0;
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__asm__ __volatile__("inl %%dx, %0 \n\t"
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"mfence \n\t"
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: "=a"(ret)
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: "d"(port)
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: "memory");
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return ret;
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}
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// 输出8个bit到输出端口
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void io_out8(unsigned short port, unsigned char value)
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{
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__asm__ __volatile__("outb %0, %%dx \n\t"
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"mfence \n\t"
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:
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: "a"(value), "d"(port)
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: "memory");
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}
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// 输出32个bit到输出端口
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void io_out32(unsigned short port, unsigned int value)
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{
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__asm__ __volatile__("outl %0, %%dx \n\t"
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"mfence \n\t"
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:
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: "a"(value), "d"(port)
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: "memory");
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}
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/**
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* @brief 读取rsp寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rsp的值的指针
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*/
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unsigned long *get_rsp()
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{
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ul *tmp;
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__asm__ __volatile__(
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"movq %%rsp, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取rbp寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rbp的值的指针
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*/
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unsigned long *get_rbp()
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{
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ul *tmp;
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__asm__ __volatile__(
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"movq %%rbp, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取ds寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* ds的值的指针
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*/
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unsigned long *get_ds()
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{
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ul *tmp;
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__asm__ __volatile__(
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"movq %%ds, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取rax寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rax的值的指针
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*/
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unsigned long *get_rax()
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{
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ul *tmp;
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__asm__ __volatile__(
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"movq %%rax, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取rbx寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rbx的值的指针
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*/
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unsigned long *get_rbx()
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{
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ul *tmp;
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__asm__ __volatile__(
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"movq %%rbx, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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// ========= MSR寄存器组操作 =============
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/**
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* @brief 向msr寄存器组的address处的寄存器写入值value
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*
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* @param address 地址
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* @param value 要写入的值
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*/
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void wrmsr(ul address, ul value)
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{
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__asm__ __volatile__("wrmsr \n\t" ::"d"(value >> 32), "a"(value & 0xffffffff), "c"(address)
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: "memory");
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}
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/**
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* @brief 从msr寄存器组的address地址处读取值
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*
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* @param address 地址
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* @return ul address处的寄存器的值
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*/
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ul rdmsr(ul address)
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{
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unsigned int tmp0, tmp1;
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__asm__ __volatile__("rdmsr \n\t"
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: "=d"(tmp0), "=a"(tmp1)
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: "c"(address)
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: "memory");
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return ((ul)tmp0 << 32) | tmp1;
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}
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