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@@ -24,73 +24,46 @@ 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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/**
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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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+ * @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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-// 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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-/*
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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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+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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+
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+ __d0 |= 8 << 16; //设置段选择子为0x1000
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+
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+ __d0 |= (0xffff & tmp_code_addr); //设置段内偏移的[15:00]
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+
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+ tmp_code_addr >>= 16;
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+ __d0 |= (0xffff & tmp_code_addr) << 48; // 设置段内偏移[31:16]
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+
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+ tmp_code_addr >>= 16;
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+
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+ __d1 = (0xffffffff & tmp_code_addr); //设置段内偏移[63:32]
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+
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+
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+ *gate_selector_addr = __d0;
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+ *(gate_selector_addr + 1) = __d1;
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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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* @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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+#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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@@ -103,7 +76,7 @@ do{ \
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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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+ 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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@@ -115,7 +88,7 @@ void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
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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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+ 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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@@ -127,7 +100,7 @@ void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
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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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+ 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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fslongjin