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150 lines
6.8 KiB
C
150 lines
6.8 KiB
C
/**
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* @file gate.h
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* @author longjin
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* @brief 门定义
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* @date 2022-01-24
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*
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*/
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#pragma once
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//描述符表的结构体
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struct desc_struct
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{
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unsigned char x[8];
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};
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//门的结构体
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struct gate_struct
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{
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unsigned char x[16];
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};
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extern struct desc_struct GDT_Table[]; //GDT_Table是head.S中的GDT_Table
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extern struct gate_struct IDT_Table[]; //IDT_Table是head.S中的IDT_Table
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extern unsigned int TSS64_Table[26];
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/**
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* @brief 初始化中段描述符表内的门描述符（每个16B）
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* @param gate_selector_addr IDT表项的地址
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* @param attr P、DPL、TYPE的属性
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* @param ist 中断栈表号
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* @param code_addr 中断服务程序的地址
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*/
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// todo:在系统异常处理主功能完成后，将这段代码用C来写一遍。这段汇编实在是太晦涩难懂了，我看了半个钟才看明白。
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/*
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#define _set_gate(gate_selector_addr, attr, ist, code_addr) \
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do{ \
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unsigned long __d0, __d1; \
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__asm__ __volatile__ ( "movw %%dx, %%ax \n\t" \
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"andq $0x7, %%rcx \n\t" // 清空rcx中除了2:0以外的所有位 此前ist的值已经被赋给了rcx \
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"addq %4, %%rcx \n\t" // 将P,DPL, Type的值加到rcx中 \
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"shlq $32, %%rcx \n\t" \
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"addq %%rcx, %%rax \n\t" // 设置ist \
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"xorq %%rcx, %%rcx \n\t" // 清空rcx \
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"movl %%edx, %%ecx \n\t" \
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"shrq $16, %%ecx \n\t" \
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"shlq $48, %%rcx \n\t" // 左移到低8B中表示段内偏移的[31:16]处 \
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"addq %%rcx, %%rax \n\t" // 设置段内偏移[31:16] \
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"movq %%rax, %0 \n\t" // 输出到门选择子的低8B \
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"shrq $32, %%rdx \n\t" \
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"movq %%rdx, %1 \n\t" // 输出到门选择子的高8B \
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:"=m"(*((unsigned long *)(gate_selector_addr))) , \
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"=m"(*(1 + (unsigned long *)(gate_selector_addr))),"=&a"(__d0),"=&d"(__d1) \
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:"i"(attr << 8), \
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"3"((unsigned long *)(code_addr)),"2"(0x8 << 16),"c"(ist) \
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:"memory" \
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); \
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}while(0)
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*/
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//由于带上注释就编译不过，因此复制一份到这里
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#define _set_gate(gate_selector_addr, attr, ist, code_addr) \
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do \
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{ \
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unsigned long __d0, __d1; \
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__asm__ __volatile__("movw %%dx, %%ax \n\t" \
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"andq $0x7, %%rcx \n\t" \
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"addq %4, %%rcx \n\t" \
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"shlq $32, %%rcx \n\t" \
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"addq %%rcx, %%rax \n\t" \
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"xorq %%rcx, %%rcx \n\t" \
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"movl %%edx, %%ecx \n\t" \
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"shrq $16, %%rcx \n\t" \
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"shlq $48, %%rcx \n\t" \
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"addq %%rcx, %%rax \n\t" \
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"movq %%rax, %0 \n\t" \
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"shrq $32, %%rdx \n\t" \
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"movq %%rdx, %1 \n\t" \
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: "=m"(*((unsigned long *)(gate_selector_addr))), \
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"=m"(*(1 + (unsigned long *)(gate_selector_addr))), "=&a"(__d0), "=&d"(__d1) \
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: "i"(attr << 8), \
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"3"((unsigned long *)(code_addr)), "2"(0x8 << 16), "c"(ist) \
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: "memory"); \
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} while (0)
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/**
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* @brief 加载任务状态段寄存器
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* @param n TSS基地址在GDT中的第几项
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* 左移3位的原因是GDT每项占8字节
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*/
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#define load_TR(n) \
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do \
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{ \
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__asm__ __volatile__("ltr %%ax" ::"a"(n << 3)); \
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} while (0)
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/**
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* @brief 设置中断门
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*
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* @param n 中断号
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* @param ist ist
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* @param addr 服务程序的地址
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*/
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void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
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{
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_set_gate(IDT_Table + n, 0x8E, ist, addr); // p=1，DPL=0, type=E
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}
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/**
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* @brief 设置64位，DPL=0的陷阱门
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*
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* @param n 中断号
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* @param ist ist
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* @param addr 服务程序的地址
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*/
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void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
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{
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_set_gate(IDT_Table + n, 0x8F, ist, addr); // p=1，DPL=0, type=F
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}
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/**
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* @brief 设置64位，DPL=3的陷阱门
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*
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* @param n 中断号
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* @param ist ist
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* @param addr 服务程序的地址
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*/
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void set_system_trap_gate(unsigned int n, unsigned char ist, void *addr)
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{
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_set_gate(IDT_Table + n, 0xEF, ist, addr); // p=1，DPL=3, type=F
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}
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/**
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* @brief 初始化TSS表的内容
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*
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*/
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void set_TSS64(ul rsp0, ul rsp1, ul rsp2, ul ist1, ul ist2, ul ist3, ul ist4, ul ist5, ul ist6, ul ist7)
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{
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*(ul *)(TSS64_Table + 1) = rsp0;
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*(ul *)(TSS64_Table + 3) = rsp1;
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*(ul *)(TSS64_Table + 5) = rsp2;
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*(ul *)(TSS64_Table + 9) = ist1;
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*(ul *)(TSS64_Table + 11) = ist2;
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*(ul *)(TSS64_Table + 13) = ist3;
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*(ul *)(TSS64_Table + 15) = ist4;
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*(ul *)(TSS64_Table + 17) = ist5;
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*(ul *)(TSS64_Table + 19) = ist6;
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*(ul *)(TSS64_Table + 21) = ist7;
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} |