Bubble sort in protected mode

1 ;16-bit code2[Bits -]3 ;Initialize data segments, code snippets, stack segments in real mode4         moveax, CS5         movSS, eax6         movSP, 0x7c00;The stack in real mode is below the boot sector7 ;converts a linear address in protected mode to a segment address in real mode: The form of an offset address8         XORedx, edx;use 64-bit division here, high 32-bit clear 09         movEAX, [CS:Gdt_base + 0x7c00];accessing data using the Transcend segment prefixTen         movEbx -                     ;Linear address = Segment Address X 16 + offset address One         Divebx A ;set a data segment that points to a descriptor -         movEBX, edx;the remainder is an offset address -         movds, EAX the ;Install data Segment Descriptor -     ;#0空描述符 -         movDWORD [ebx + 0x00], 0x0000_0000 -         movDWORD [ebx + 0x04], 0x0000_0000 +     ;#1代码段 -         movDWORD [ebx + 0x08], 0x7c00_01ff +         movDWORD [ebx + 0x0C], 0x0040_9800 A     ;#2数据段 at         movDWORD [ebx + 0x10], 0x0000_ffff -         movDWORD [ebx + 0x14], 0x00cf_9200 -     ;#3别名代码段 -         movDWORD [ebx + 0x18], 0x7c00_01ff -         movDWORD [ebx + 0x1C], 0x0040_9200 -     ;#4堆栈段 in         movDWORD [ebx + 0x20], 0X0000_6BFF -         movDWORD [ebx + 0x24], 0x0040_9600 to ;load GDT +         movWord [CS:gdt_size + 0x7c00], 0x27 -         LGDT[CS:gdt_size + 0x7c00] the ;Open A20 *     inchal, 0x92 $     oral, 0000_0010bPanax Notoginseng      out0x92, Al - ;off Interrupt the     CLI + ;Enter protection mode (16-bit) A     moveax, Cr0 the     oreax, 0000_0001b +     movCR0, eax - ;Enter protection mode (32-bit) $     jmpDWORD 0x08:Flush $ ;32-bit code -[Bits +] -     Flush: the     ;Load alias code snippet -     moveax, 0x18Wuyi     movds, EAX the      -     ;Loading Data Segments Wu     moveax, 0x10 -     moves, eax About      $     ;Load Stack -     moveax, 0x20 -     movSS, eax -     movESP, 0X0000_7BFF A      +     ;start the message character on the screen the         movecx, Gdt_size-welcome -         XORebx, ebx $     wel: the         moval, [ebx + welcome] the         movAh, 0x0A the         mov[es:0x000b_8000 + ebx *2], Ax the         Incebx - Loop wel in     ;Bubble Sort the         movECX, Welcome-string-1 the     external: About         XORebx, ebx the         Pushecx the     internal: the         movAX, [ebx + string] +         CMPAh, Al -         JGCon the         XchgAh, AlBayi         movWord [ebx + string], ax the     Con: the         Incebx - Loop Internal -         Popecx the Loop External the     ;Show the results of a sort the     movecx, welcome-string the         XORebx, ebx -     Res: the         moval, [ebx + string] the         movAh, 0x0A the         mov[es:0x000b_8000 + the+ EBX *2], Ax94         Incebx the Loop Res the     ;Downtime the          hlt 98 ;the string to be sorted About         string:Db'958458456541186545552135789642589103598416552556' -         Welcome:Db'Welcome to Lixiaomao boot.'101 ;GDT Locations and Boundaries102         gdt_size:Dw0                ;This word is used to store the boundaries of GDT.103         gdt_base:DD 0x0000_7e00;I 'm going to put the GDT behind the boot sector.104 ;fill the remaining sectors theTimes510-($-$$) DB0106DB 0x55, 0xAA

Bubble sort in protected mode