mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-09 15:26:47 +00:00
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/**
|
||
* @file gate.h
|
||
* @author longjin
|
||
* @brief 门定义
|
||
* @date 2022-01-24
|
||
*
|
||
*/
|
||
|
||
#pragma once
|
||
|
||
//描述符表的结构体
|
||
struct desc_struct
|
||
{
|
||
unsigned char x[8];
|
||
};
|
||
|
||
//门的结构体
|
||
struct gate_struct
|
||
{
|
||
unsigned char x[16];
|
||
};
|
||
|
||
extern struct desc_struct GDT_Table[]; //GDT_Table是head.S中的GDT_Table
|
||
extern struct gate_struct IDT_Table[]; //IDT_Table是head.S中的IDT_Table
|
||
extern unsigned int TSS64_Table[26];
|
||
|
||
|
||
/**
|
||
* @brief 初始化中段描述符表内的门描述符(每个16B)
|
||
* @param gate_selector_addr IDT表项的地址
|
||
* @param attr P、DPL、TYPE的属性
|
||
* @param ist 中断栈表号
|
||
* @param code_addr 指向中断服务程序的指针的地址
|
||
*/
|
||
|
||
void set_gate(ul *gate_selector_addr, ul attr, unsigned char ist, ul *code_addr)
|
||
{
|
||
ul __d0=0, __d1=0;
|
||
ul tmp_code_addr = *code_addr;
|
||
__d0 = attr << 40; //设置P、DPL、Type
|
||
|
||
__d0 |= ((ul)(ist) << 32); // 设置ist
|
||
|
||
__d0 |= 8 << 16; //设置段选择子为0x1000
|
||
|
||
__d0 |= (0xffff & tmp_code_addr); //设置段内偏移的[15:00]
|
||
|
||
tmp_code_addr >>= 16;
|
||
__d0 |= (0xffff & tmp_code_addr) << 48; // 设置段内偏移[31:16]
|
||
|
||
tmp_code_addr >>= 16;
|
||
|
||
__d1 = (0xffffffff & tmp_code_addr); //设置段内偏移[63:32]
|
||
|
||
|
||
*gate_selector_addr = __d0;
|
||
*(gate_selector_addr + 1) = __d1;
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
/**
|
||
* @brief 加载任务状态段寄存器
|
||
* @param n TSS基地址在GDT中的第几项
|
||
* 左移3位的原因是GDT每项占8字节
|
||
*/
|
||
#define load_TR(n) \
|
||
do \
|
||
{ \
|
||
__asm__ __volatile__("ltr %%ax" ::"a"(n << 3)); \
|
||
} while (0)
|
||
|
||
/**
|
||
* @brief 设置中断门
|
||
*
|
||
* @param n 中断号
|
||
* @param ist ist
|
||
* @param addr 服务程序的地址
|
||
*/
|
||
void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
|
||
{
|
||
set_gate((ul*)(IDT_Table + n), 0x8E, ist, (ul*)(&addr)); // p=1,DPL=0, type=E
|
||
}
|
||
|
||
/**
|
||
* @brief 设置64位,DPL=0的陷阱门
|
||
*
|
||
* @param n 中断号
|
||
* @param ist ist
|
||
* @param addr 服务程序的地址
|
||
*/
|
||
void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
|
||
{
|
||
set_gate((ul*)(IDT_Table + n), 0x8F, ist, (ul*)(&addr)); // p=1,DPL=0, type=F
|
||
}
|
||
|
||
/**
|
||
* @brief 设置64位,DPL=3的陷阱门
|
||
*
|
||
* @param n 中断号
|
||
* @param ist ist
|
||
* @param addr 服务程序的地址
|
||
*/
|
||
void set_system_trap_gate(unsigned int n, unsigned char ist, void *addr)
|
||
{
|
||
set_gate((ul*)(IDT_Table + n), 0xEF, ist, (ul*)(&addr)); // p=1,DPL=3, type=F
|
||
}
|
||
|
||
/**
|
||
* @brief 初始化TSS表的内容
|
||
*
|
||
*/
|
||
void set_TSS64(ul rsp0, ul rsp1, ul rsp2, ul ist1, ul ist2, ul ist3, ul ist4, ul ist5, ul ist6, ul ist7)
|
||
{
|
||
*(ul *)(TSS64_Table + 1) = rsp0;
|
||
*(ul *)(TSS64_Table + 3) = rsp1;
|
||
*(ul *)(TSS64_Table + 5) = rsp2;
|
||
|
||
*(ul *)(TSS64_Table + 9) = ist1;
|
||
*(ul *)(TSS64_Table + 11) = ist2;
|
||
*(ul *)(TSS64_Table + 13) = ist3;
|
||
*(ul *)(TSS64_Table + 15) = ist4;
|
||
*(ul *)(TSS64_Table + 17) = ist5;
|
||
*(ul *)(TSS64_Table + 19) = ist6;
|
||
*(ul *)(TSS64_Table + 21) = ist7;
|
||
} |