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🔧 使用C语言重写了设置中断门的代码。
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@ -24,64 +24,37 @@ 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 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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extern unsigned int TSS64_Table[26];
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/**
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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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* @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 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 attr P、DPL、TYPE的属性
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* @param ist 中断栈表号
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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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* @param code_addr 指向中断服务程序的指针的地址
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*/
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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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void set_gate(ul *gate_selector_addr, ul attr, unsigned char ist, ul *code_addr)
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{
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ul __d0=0, __d1=0;
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ul tmp_code_addr = *code_addr;
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__d0 = attr << 40; //设置P、DPL、Type
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/*
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__d0 |= ((ul)(ist) << 32); // 设置ist
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#define _set_gate(gate_selector_addr, attr, ist, code_addr) \
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do{ \
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__d0 |= 8 << 16; //设置段选择子为0x1000
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unsigned long __d0, __d1; \
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__asm__ __volatile__ ( "movw %%dx, %%ax \n\t" \
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__d0 |= (0xffff & tmp_code_addr); //设置段内偏移的[15:00]
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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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tmp_code_addr >>= 16;
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"shlq $32, %%rcx \n\t" \
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__d0 |= (0xffff & tmp_code_addr) << 48; // 设置段内偏移[31:16]
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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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tmp_code_addr >>= 16;
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"movl %%edx, %%ecx \n\t" \
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"shrq $16, %%ecx \n\t" \
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__d1 = (0xffffffff & tmp_code_addr); //设置段内偏移[63:32]
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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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*gate_selector_addr = __d0;
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"shrq $32, %%rdx \n\t" \
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*(gate_selector_addr + 1) = __d1;
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"movq %%rdx, %1 \n\t" // 输出到门选择子的高8B \
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}
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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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/**
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* @brief 加载任务状态段寄存器
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* @brief 加载任务状态段寄存器
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@ -103,7 +76,7 @@ do{ \
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*/
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*/
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void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
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void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
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{
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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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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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/**
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/**
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@ -115,7 +88,7 @@ void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
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*/
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*/
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void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
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void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
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{
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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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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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/**
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/**
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@ -127,7 +100,7 @@ void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
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*/
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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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void set_system_trap_gate(unsigned int n, unsigned char ist, void *addr)
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{
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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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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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/**
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/**
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