[refactor] 整理注释

kernel/interrupt/pic.cpp

@@ -13,37 +13,37 @@ static inline UINT8 inb(UINT16 port) {
     return ret;
 }
 
+// 慢速 PIC 的小延迟
 static void pic_wait(void) {
-    // Small delay for slow PICs
     ASM("jmp 1f\n\t1: jmp 1f\n\t1:");
 }
 
 void pic_init(void) {
     serial_write("PIC: remapping 8259 PIC\n");
 
-    // Save masks
+    // 保存掩码
     UINT8 mask1 = inb(PIC1_DATA);
     UINT8 mask2 = inb(PIC2_DATA);
 
-    // ICW1: begin initialization, ICW4 needed
+    // ICW1：开始初始化，需要 ICW4
     outb(PIC1_CMD, 0x11); pic_wait();
     outb(PIC2_CMD, 0x11); pic_wait();
 
-    // ICW2: vector offset
-    outb(PIC1_DATA, PIC_IRQ_BASE);     // IRQ 0-7 → vector 0x20-0x27
+    // ICW2：向量偏移
+    outb(PIC1_DATA, PIC_IRQ_BASE);     // IRQ 0-7 → 向量 0x20-0x27
     pic_wait();
-    outb(PIC2_DATA, PIC_IRQ_BASE + 8); // IRQ 8-15 → vector 0x28-0x2F
+    outb(PIC2_DATA, PIC_IRQ_BASE + 8); // IRQ 8-15 → 向量 0x28-0x2F
     pic_wait();
 
-    // ICW3: cascading
-    outb(PIC1_DATA, 0x04); pic_wait();  // slave on IRQ 2
-    outb(PIC2_DATA, 0x02); pic_wait();  // cascade identity
+    // ICW3：级联
+    outb(PIC1_DATA, 0x04); pic_wait();  // 从片在 IRQ 2
+    outb(PIC2_DATA, 0x02); pic_wait();  // 级联标识
 
-    // ICW4: 8086 mode
+    // ICW4：8086 模式
     outb(PIC1_DATA, 0x01); pic_wait();
     outb(PIC2_DATA, 0x01); pic_wait();
 
-    // Restore masks
+    // 恢复掩码
     outb(PIC1_DATA, mask1);
     outb(PIC2_DATA, mask2);