mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-20 01:46:31 +00:00
🆕 完成了系统信息的获取、屏幕大小切换、cpu模式切换
This commit is contained in:
fslongjin
@ -17,20 +17,37 @@ Offset_Tmp_Of_Kernel_File equ 0x7e00 ; 内核程序的临时转存空间
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Memory_Struct_Buffer_Addr equ 0x7e00 ; 内核被转移到最终的内存空间后，原来的临时空间就作为内存结构数据的存储空间
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; ==== 临时的全局描述符表 =====
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[SECTION gdt]
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LABEL_GDT: dd 0,0
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LABEL_DESC_CODE32: dd 0x0000FFFF,0x00CF9A00
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LABEL_DESC_CODE32: dd 0x0000FFFF,0x00CF9A00 ; 代码段和数据段的段基地址都设置在0x00000000处， 把段限长设置为0xffffffff，可以索引32位地址空间
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LABEL_DESC_DATA32: dd 0x0000FFFF,0x00CF9200
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GdtLen equ $ - LABEL_GDT
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; GDTR寄存器是一个6B的结构，低2B保存GDT的长度， 高4B保存GDT的基地址
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GdtPtr dw GdtLen - 1
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dd LABEL_GDT
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; 这是两个段选择子，是段描述符在GDT表中的索引号
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SelectorCode32 equ LABEL_DESC_CODE32 - LABEL_GDT
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SelectorData32 equ LABEL_DESC_DATA32 - LABEL_GDT
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; === IA-32e模式的临时gdt表
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[SECTION gdt64]
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LABEL_GDT64: dq 0x0000000000000000
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LABEL_DESC_CODE64: dq 0x0020980000000000
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LABEL_DESC_DATA64: dq 0x0000920000000000
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GdtLen64 equ $ - LABEL_GDT64
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GdtPtr64 dw GdtLen64-1,
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dd LABEL_GDT64
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SelectorCode64 equ LABEL_DESC_CODE64 - LABEL_GDT64
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SelectorData64 equ LABEL_DESC_DATA64 - LABEL_GDT64
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[SECTION .s16] ;定义一个名为.s16的段
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[BITS 16] ; 通知nasm，将要运行在16位宽的处理器上
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@ -349,7 +366,7 @@ Label_Get_Mem_OK:
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mov ax, 0x1301
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mov bx, 0x000f
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mov dx, 0x0400 ; 在第5行显示
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mov cx, 39
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mov cx, 38
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push ax
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mov ax, ds
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mov es, ax
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@ -364,16 +381,290 @@ Label_Get_SVGA_Info:
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mov ax, 0x1301
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mov bx, 0x000f
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mov dx, 0x0500 ; 在第6行显示
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mov cx, 30
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mov cx, 34
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, Message_Start_Get_SVGA_Info
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mov bp, Message_Start_Get_SVGA_VBE_Info
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int 0x10
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; 使用INT0x10的主功能号0x4F00获取SVGA VBE信息
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; For more information, please visit: https://longjin666.top/?p=1321
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mov ax, 0x00
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mov es, ax
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mov di, 0x8000
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mov ax, 0x4F00
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int 0x10
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cmp ax, 0x004F ; 获取成功
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jz Label_Get_SVGA_VBE_Success
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Label_Get_SVGA_VBE_Failed:
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; 获取SVGA VBE信息失败
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mov ax, 0x1301
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mov bx, 0x008c
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mov dx, 0x0600 ; 在第7行显示
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mov cx, 33
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, Message_Get_SVGA_VBE_Failed
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int 0x10
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jmp $
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Label_Get_SVGA_VBE_Success:
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mov ax, 0x1301
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mov bx, 0x000f
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mov dx, 0x0600 ; 在第7行显示
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mov cx, 38
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, Message_Get_SVGA_VBE_Success
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int 0x10
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Label_Get_SVGA_Mode_Info:
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; ====== 获取SVGA mode信息 ======
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mov ax, 0x1301
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mov bx, 0x000f
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mov dx, 0x0700 ; 在第8行显示
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mov cx, 35
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, Message_Start_Get_SVGA_Mode_Info
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int 0x10
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mov ax, 0x00
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mov es, ax
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mov si, 0x800e ; 根据文档可知，偏移量0Eh处， DWORD pointer to list of supported VESA and OEM video modes
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;(list of words terminated with FFFFh)
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mov esi, dword [es:si]
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mov edi, 0x8200
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Label_SVGA_Mode_Info_Get:
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mov cx, word [es:esi]
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; ===========显示SVGA mode的信息
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;push ax
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;mov ax, 0x00
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;mov al, ch
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;call Label_DispAL
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;mov ax, 0x00
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;mov al, cl
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;call Label_DispAL
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;pop ax
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;============
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; 判断是否获取完毕
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cmp cx, 0xFFFF
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jz Label_SVGA_Mode_Info_Finish
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mov ax, 0x4f01 ; 使用4f01功能，获取SVGA的模式
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int 0x10
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cmp ax, 0x004f ; 判断是否获取成功
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jnz Label_SVGA_Mode_Info_Fail
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add esi, 2
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add edi, 0x100 ; 开辟一个 256-byte 的 buffer
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jmp Label_SVGA_Mode_Info_Get
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Label_SVGA_Mode_Info_Fail:
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; === 获取信息失败 ===
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mov ax, 0x1301
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mov bx, 0x008c
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mov dx, 0x0800 ; 在第9行显示
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mov cx, 34
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, Message_Get_SVGA_Mode_Failed
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int 0x10
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jmp $
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Label_SVGA_Mode_Info_Finish:
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; === 成功获取SVGA mode信息 ===
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mov ax, 0x1301
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mov bx, 0x000f
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mov dx, 0x0800 ; 在第9行显示
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mov cx, 39
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, Message_Get_SVGA_Mode_Success
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int 0x10
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jmp Label_Set_SVGA_Mode
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Label_SET_SVGA_Mode_VESA_VBE_FAIL:
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; 设置SVGA显示模式失败
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mov ax, 0x1301
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mov bx, 0x008c
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mov dx, 0x0800 ; 在第10行显示
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mov cx, 29
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, Message_Set_SVGA_Mode_Failed
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int 0x10
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jmp $
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Label_Set_SVGA_Mode:
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; ===== 设置SVGA芯片的显示模式(VESA VBE) ===
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mov ax, 0x4f02 ; 使用int0x10 功能号AX=4f02设置SVGA芯片的显示模式
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mov bx, 0x4180 ; 显示模式可以选择0x180(1440*900 32bit)或者0x143(800*600 32bit)
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int 0x10
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cmp ax, 0x004F
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jnz Label_SET_SVGA_Mode_VESA_VBE_FAIL
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; ===== 初始化GDT表，切换到保护模式 =====
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cli ; 关闭外部中断
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db 0x66
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lgdt [GdtPtr]
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db 0x66
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lidt [IDT_POINTER]
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mov eax, cr0
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or eax, 1 ; 启用保护模式
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mov cr0, eax
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; 跳转到保护模式下的第一个程序
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jmp dword SelectorCode32:GO_TO_TMP_Protect
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[SECTION .s32]
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[BITS 32]
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GO_TO_TMP_Protect:
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; ==== 切换到长模式 =====
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mov ax, 0x10
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov ss, ax
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mov esp, 0x7e00 ; 将栈指针设置在实模式获取到的数据的基地址上
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call support_long_mode ; 检测是否支持长模式
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test eax, eax ; 将eax自身相与，检测是否为0（test指令不会把结果赋值回去eax）
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jz no_support ; 不支持长模式
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; 初始化临时页表， 基地址设置为0x90000
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; 设置各级页表项的值（页表起始地址与页属性组成）
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mov dword [0x90000], 0x91007
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mov dword [0x90004], 0x00000
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mov dword [0x90800], 0x91007
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mov dword [0x90804], 0x00000
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mov dword [0x91000], 0x92007
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mov dword [0x91004], 0x00000
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mov dword [0x92000], 0x000083
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mov dword [0x92004], 0x000000
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mov dword [0x92008], 0x200083
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mov dword [0x9200c], 0x000000
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mov dword [0x92010], 0x400083
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mov dword [0x92014], 0x000000
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mov dword [0x92018], 0x600083
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mov dword [0x9201c], 0x000000
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mov dword [0x92020], 0x800083
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mov dword [0x92024], 0x000000
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mov dword [0x92028], 0xa00083
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mov dword [0x9202c], 0x000000
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; === 加载GDT ===
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db 0x66
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lgdt [GdtPtr64] ; 加载GDT
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; 把临时gdt的数据段加载到寄存器中(cs除外)
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mov ax, 0x10
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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mov esp, 0x7e00
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; ====== 开启物理地址扩展 =====
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; 通过bts指令，将cr4第5位置位，开启PAE
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mov eax, cr4
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bts eax, 5
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mov cr4, eax
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; 将临时页目录的地址设置到CR3控制寄存器中
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mov eax, 0x90000
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mov cr3, eax
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; ==== 启用长模式 ===
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; 参见英特尔开发手册合集p4360 volume4, chapter2 2-60 Vol. 4
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; IA32_EFER寄存器的第8位是LME标志位，能启用IA-32e模式
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mov ecx, 0xC0000080
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rdmsr
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bts eax, 8
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wrmsr
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; === 开启分页机制 ===
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mov eax, cr0
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bts eax, 0 ; 再次开启保护模式
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bts eax, 31 ; 开启分页管理机制
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mov cr0, eax
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; === 通过此条远跳转指令，处理器跳转到内核文件进行执行，正式进入IA-32e模式
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jmp SelectorCode64:Offset_Of_Kernel_File
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support_long_mode:
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; ===== 检测是否支持长模式 ====
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mov eax, 0x80000000
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cpuid ; cpuid指令返回的信息取决于eax的值。当前返回到eax中的是最大的输入参数值。 详见：英特尔开发人员手册卷2A Chapter3 (Page 304)
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cmp eax, 0x80000001
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setnb al ; 当cmp结果为不低于时，置位al
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jb support_long_mode_done ; 当eax小于0x80000001时，跳转
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mov eax, 0x80000001
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cpuid ; 获取特定信息，参照开发人员手册卷2A p304
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bt edx, 29 ; 将edx第29位的值移到CF上。该位指示了CPU是否支持IA-32e模式
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; Bit 29: Intel® 64 Architecture available if 1.
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setc al ; 若支持则al置位
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support_long_mode_done:
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movzx eax, al ; 将al，零扩展为32位赋值给eax
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ret
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no_support:
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; 不支持长模式
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jmp $
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[SECTION .s16lib]
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[BITS 16]
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; 从软盘读取一个扇区
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; AX=待读取的磁盘起始扇区号
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; CL=读入的扇区数量
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@ -471,24 +762,75 @@ Label_Even_2:
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pop es
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ret
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; ==== 显示AL中的信息 ===
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Label_DispAL:
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push ecx
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push edx
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push edi
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mov edi, [DisplayPosition]
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mov ah, 0x0F
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mov dl, al ; 为了先显示al的高4位，因此先将al暂存在dl中，然后把al往右移动4位
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shr al, 4
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mov ecx, 2 ; 计数为2
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.begin:
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and al, 0x0F
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cmp al, 9
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ja .1 ; 大于9，跳转到.1
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add al, '0'
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jmp .2
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.1:
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sub al, 0x0a
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add al, 'A'
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.2:
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; 移动到显示内存中
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mov [gs:edi], ax
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add edi, 2
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mov al, dl
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loop .begin
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;====临时变量=====
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mov [DisplayPosition], edi
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pop edi
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pop edx
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pop ecx
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ret
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; === 临时的中断描述符表 ===
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; 为临时的IDT开辟空间。
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; 由于模式切换过程中已经关闭了外部中断，只要确保模式切换过程中不产生异常，就不用完整的初始化IDT。甚至乎，只要没有异常产生，没有IDT也可以。
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IDT:
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times 0x50 dq 0
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IDT_END:
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IDT_POINTER:
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dw IDT_END - IDT - 1
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dd IDT
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;==== 临时变量 =====
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RootDirSizeForLoop dw RootDirSectors
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SectorNo dw 0
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Odd db 0
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OffsetOfKernelFileCount dd Offset_Of_Kernel_File
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DisplayPosition dd 0
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; 要显示的消息文本
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Message_Start_Loader: db "[DragonOS] Start Loader"
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Message_No_Loader: db "[ERROR] No Kernel Found."
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Message_Kernel_Loaded: db "[INFO] Kernel loaded"
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Message_Start_Get_Mem_Struct: db "[INFO] Try to get memory struct..."
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Message_Get_Mem_Failed: db "[ERROR] Get memory struct failed."
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Message_Get_Mem_Success: db "[INFO] Successful to get memory struct."
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Message_Start_Get_SVGA_Info: db "[INFO] Try to get SVGA info..."
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Message_Get_Mem_Success: db "[INFO] Successfully got memory struct."
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Message_Start_Get_SVGA_VBE_Info: db "[INFO] Try to get SVGA VBE info..."
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Message_Get_SVGA_VBE_Failed: db "[ERROR] Get SVGA VBE info failed."
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Message_Get_SVGA_VBE_Success: db "[INFO] Successfully got SVGA VBE info."
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Message_Start_Get_SVGA_Mode_Info: db "[INFO] Try to get SVGA mode info..."
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Message_Get_SVGA_Mode_Failed: db "[ERROR] Get SVGA Mode info failed."
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Message_Get_SVGA_Mode_Success: db "[INFO] Successfully got SVGA Mode info."
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Message_Set_SVGA_Mode_Failed: db "[ERROR] Set SVGA Mode failed."
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Kernel_FileName: db "KERNEL BIN", 0
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