🆕 cpu模块获取处理器固件基础信息

kernel/Makefile

@@ -15,8 +15,9 @@ all: kernel
 # cp kernel ../bin/kernel/kernel.elf
 
 
-kernel: head.o entry.o main.o printk.o trap.o mm.o irq.o 8259A.o process.o syscall.o multiboot2.o
+kernel: head.o entry.o main.o printk.o trap.o mm.o irq.o 8259A.o process.o syscall.o multiboot2.o cpu.o
 	ld -b elf64-x86-64 -z muldefs -o kernel head.o exception/entry.o main.o common/printk.o exception/trap.o exception/irq.o exception/8259A.o mm/mm.o process/process.o syscall/syscall.o driver/multiboot2/multiboot2.o \
+	common/cpu.o	\
 	-T link.lds
 
 head.o: head.S
@@ -59,5 +60,8 @@ syscall.o: syscall/syscall.c
 multiboot2.o: driver/multiboot2/multiboot2.c 
 	gcc $(CFLAGS) -c driver/multiboot2/multiboot2.c  -o driver/multiboot2/multiboot2.o
 
+cpu.o: common/cpu.c 
+	gcc $(CFLAGS) -c common/cpu.c -o common/cpu.o
+
 clean: 
 	rm -rf $(GARBAGE)

kernel/common/cpu.c

@@ -0,0 +1,64 @@
+#include "cpu.h"
+#include "kprint.h"
+#include "printk.h"
+
+void cpu_init(void)
+{
+    // 获取处理器制造商信息
+    uint tmp_info[4] = {0};
+    cpu_cpuid(0, 0, &tmp_info[0], &tmp_info[1], &tmp_info[2], &tmp_info[3]);
+    
+    // 保存CPU支持的最大cpuid指令主功能号
+    Cpu_cpuid_max_Basic_mop = tmp_info[0];
+    // 保存制造商名称
+    *(uint *)&Cpu_Manufacturer_Name[0] = tmp_info[1];
+    *(uint *)&Cpu_Manufacturer_Name[4] = tmp_info[3];
+    *(uint *)&Cpu_Manufacturer_Name[8] = tmp_info[2];
+    Cpu_Manufacturer_Name[12] = '\0';
+    kinfo("CPU manufacturer: %s", Cpu_Manufacturer_Name);
+
+    // 获取处理器型号信息
+    int count = 0;
+    for (uint i = 0x80000002; i < 0x80000005; ++i)
+    {
+        cpu_cpuid(i, 0, &tmp_info[0], &tmp_info[1], &tmp_info[2], &tmp_info[3]);
+        for (int j = 0; j <= 3; ++j)
+        {
+            *(uint *)&Cpu_BrandName[4 * count] = tmp_info[j];
+            ++count;
+        }
+    }
+    Cpu_BrandName[48] = '\0';
+
+    kinfo("CPU Brand Name: %s", Cpu_BrandName);
+
+    // 使用cpuid主功能号0x01进行查询(未保存ebx ecx edx的信息，具体参见白皮书)
+    cpu_cpuid(1, 0, &tmp_info[0], &tmp_info[1], &tmp_info[2], &tmp_info[3]);
+
+    // EAX中包含 Version Informatin Type,Family,Model,and Stepping ID
+    Cpu_Stepping_ID = tmp_info[0] & 0xf;
+    Cpu_Model_ID = (tmp_info[0]>>4) & 0xf;
+    Cpu_Family_ID = (tmp_info[0]>>8) & 0xf;
+    Cpu_Processor_Type = (tmp_info[0]>>12)& 0x3;
+    // 14-15位保留
+    Cpu_Extended_Model_ID = (tmp_info[0]>>16)&0xf;
+    Cpu_Extended_Family_ID = (tmp_info[0]>>20)&0xff;
+    //31-25位保留
+    kinfo("Family ID=%#03lx\t Extended Family ID=%#03lx\t Processor Type=%#03lx\t",Cpu_Family_ID, Cpu_Extended_Family_ID, Cpu_Processor_Type);
+    kinfo("Model ID=%#03lx\t Extended Model ID=%#03lx\tStepping ID=%#03lx\t",Cpu_Model_ID, Cpu_Extended_Model_ID,Cpu_Stepping_ID);
+
+    // 使用0x80000008主功能号，查询处理器支持的最大可寻址地址线宽度
+    cpu_cpuid(0x80000008, 0, &tmp_info[0], &tmp_info[1], &tmp_info[2], &tmp_info[3]);
+    Cpu_max_phys_addrline_size = tmp_info[0]&0xff;
+    Cpu_max_linear_addrline_size = (tmp_info[0]>>8)&0xff;
+
+    kinfo("Cpu_max_phys_addrline_size = %d", Cpu_max_phys_addrline_size);
+    kinfo("Cpu_max_linear_addrline_size = %d", Cpu_max_linear_addrline_size);
+    
+    cpu_cpuid(0x80000000, 0, &tmp_info[0], &tmp_info[1], &tmp_info[2], &tmp_info[3]);
+    Cpu_cpuid_max_Extended_mop = tmp_info[0];
+
+    kinfo("Max basic mop=%#05lx",Cpu_cpuid_max_Basic_mop);
+    kinfo("Max extended mop=%#05lx",Cpu_cpuid_max_Extended_mop);
+    return;
+}

kernel/common/cpu.h

@@ -1,3 +1,55 @@
 #pragma once
 
-#define CPU_NUM 8
+#include "glib.h"
+
+#define CPU_NUM 8 
+
+// cpu支持的最大cpuid指令的基础主功能号
+uint Cpu_cpuid_max_Basic_mop;
+// cpu支持的最大cpuid指令的扩展主功能号
+uint Cpu_cpuid_max_Extended_mop;
+// cpu制造商信息
+char Cpu_Manufacturer_Name[17]={0};
+// 处理器名称信息
+char Cpu_BrandName[49] = {0};
+// 处理器家族ID
+uint Cpu_Family_ID;
+// 处理器扩展家族ID
+uint Cpu_Extended_Family_ID;
+// 处理器模式ID
+uint Cpu_Model_ID;
+// 处理器扩展模式ID
+uint Cpu_Extended_Model_ID;
+// 处理器步进ID
+uint Cpu_Stepping_ID;
+// 处理器类型
+uint Cpu_Processor_Type;
+// 处理器支持的最大物理地址可寻址地址线宽度
+uint Cpu_max_phys_addrline_size;
+// 处理器支持的最大线性地址可寻址地址线宽度
+uint Cpu_max_linear_addrline_size;
+
+/**
+ * @brief 执行cpuid指令
+ * 
+ * @param mop 主功能号
+ * @param sop 子功能号
+ * @param eax 结果的eax值
+ * @param ebx 结果的ebx值
+ * @param ecx 结果的ecx值
+ * @param edx 结果的edx值
+ * 
+ * cpuid指令参考英特尔开发手册卷2A Chapter3 3.2 Instruction
+ */
+void cpu_cpuid(uint mop, uint sop, uint *eax, uint*ebx, uint*ecx, uint*edx)
+{   
+    // 向eax和ecx分别输入主功能号和子功能号
+    // 结果输出到eax, ebx, ecx, edx
+    __asm__ __volatile__("cpuid \n\t":"=a"(*eax),"=b"(*ebx), "=c"(*ecx), "=d"(*edx):"0"(mop),"2"(sop):"memory");
+}
+
+/**
+ * @brief 初始化获取处理器信息模块
+ * 
+ */
+void cpu_init(void);

kernel/exception/trap.c

@@ -3,7 +3,7 @@
 #include "../process/ptrace.h"
 #include"../common/kprint.h"
 
-void init_sys_vector()
+void sys_vector_init()
 {
     set_trap_gate(0, 1, divide_error);
     set_trap_gate(1, 1, debug);

kernel/main.c

@@ -85,6 +85,8 @@ void system_initialize()
     // 先初始化系统调用模块
     syscall_init();
 
+    cpu_init();
+
     // 再初始化进程模块。顺序不能调转
     process_init();
 }