From 4c438ce64d005366f04c249ebdb3ee22c0c52e45 Mon Sep 17 00:00:00 2001
From: fslongjin <fslongjin@vip.qq.com>
Date: Mon, 24 Jan 2022 23:10:38 +0800
Subject: [PATCH] =?UTF-8?q?:new:=20=E8=AE=BE=E7=BD=AE=E9=97=A8=E7=9A=84?=
 =?UTF-8?q?=E5=AE=8F=E5=AE=9A=E4=B9=89?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 kernel/exception/gate.h | 42 ++++++++++++++++++++++++++++++++++++
 kernel/exception/trap.h | 48 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 kernel/exception/gate.h
 create mode 100644 kernel/exception/trap.h

diff --git a/kernel/exception/gate.h b/kernel/exception/gate.h
new file mode 100644
index 00000000..d0bdb0b4
--- /dev/null
+++ b/kernel/exception/gate.h
@@ -0,0 +1,42 @@
+/**
+ * @file gate.h
+ * @author longjin
+ * @brief 门定义
+ * @date 2022-01-24
+ * 
+ */
+
+#pragma once
+
+
+/**
+ * @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 中断服务程序的地址
+ */
+// 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。
+#define _set_gate(gate_selector_addr, attr, ist, code_addr) \
+do{
+    unsigned long __d0, __d1;                               \
+    __asm__ __volatile__ (  "movw   %%dx,   %%ax    \n\t"   \
+                            "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)
+                            "addq   %4,     %%rcx   \n\t"   \   // 将P,DPL, Type的值加到rcx中
+                            "shlq   $32,    %%rcx   \n\t"   \ 
+                            "addq   %%rcx,  %%rax   \n\t"   \   // 设置ist
+                            "xorq   %%rcx,  %%rcx   \n\t"   \   // 清空rcx
+                            "movl   %%edx,  %%ecx   \n\t"   \ 
+                            "shrq   $16,    %%ecx   \n\t"   \
+                            "shlq   $48,    %%rcx   \n\t"   \   // 左移到低8B中表示段内偏移的[31:16]处
+                            "addq   %%rcx,  %%rax   \n\t"   \   // 设置段内偏移[31:16]
+                            "movq   %%rax,  %0      \n\t"   \   // 输出到门选择子的低8B
+                            "shrq   $32,    %%rdx   \n\t"   \
+                            "movq   %%rdx,  %1      \n\t"   \   // 输出到门选择子的高8B
+                            :"=m"(*((unsigned long *)(gate_selector_addr)))	,					                \
+					            "=m"(*(1 + (unsigned long *)(gate_selector_addr))),"=&a"(__d0),"=&d"(__d1)		\
+					        :"i"(attr << 8),									                                \
+					            "3"((unsigned long *)(code_addr)),"2"(0x8 << 16),"c"(ist)				        \
+					        :"memory"		                                                                    \
+    )
+}while(0)
diff --git a/kernel/exception/trap.h b/kernel/exception/trap.h
new file mode 100644
index 00000000..3a47c855
--- /dev/null
+++ b/kernel/exception/trap.h
@@ -0,0 +1,48 @@
+/**
+ * @file trap.h
+ * @author longjin@RinGoTek.cn
+ * @brief 异常捕获模块
+ * @date 2022-01-24
+ * 
+ */
+
+#pragma once
+
+#include <common/printk.h>
+#include <common/glib.h>
+
+/**
+ * @brief 初始化系统中断表
+ * 
+ */
+void init_sys_vector();
+
+//除法错误
+void divide_error();
+// 调试
+void debug();
+// 不可屏蔽中断
+void nmi();
+//
+void int3();
+// 溢出
+void overflow();
+// 边界问题
+void bounds();
+// 未定义的操作数
+void undefined_opcode();
+// 设备不可用
+void dev_not_available();
+void double_fault();
+void coprocessor_segment_overrun();
+void invalid_TSS();
+void segment_not_present();
+void stack_segment_fault();
+void general_protection();
+// 缺页异常
+void page_fault();
+void x87_FPU_error();
+void alignment_check();
+void machine_check();
+void SIMD_exception();
+void virtualization_exception();