mirror of
https://github.com/Ed94/bare_x86.git
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94 lines
2.2 KiB
ArmAsm
94 lines
2.2 KiB
ArmAsm
; x86
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; 16-bit - Real Mode, V86 Mode
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; https://codereview.stackexchange.com/questions/230755/display-hexadecimal-value-stored-at-a-register
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%include "AAL.x86.S"
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%include "AAL.x86.routines.macros.S"
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; 16-Bit Mode
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[BITS 16]
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; The ORG directive specifies the starting address of a segment
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[ORG Mem_BootSector_Start]
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;=============================================================================================================
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; Boot Sector Code
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;=============================================================================================================
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start:
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Video_SetTextMode_80x25
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; Video_SetGraphicsMode_320x200
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; Video_SetGraphicsMode_640x200
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; Exclusive-OR (xor'ing a value to itself zeros the value)
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xor AX, AX
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; Set Data Segment and Extra Segment to 0x0000
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mov DS, AX
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mov ES, AX
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; Set Stack Segment (SS) to to 0x0000
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mov SS, AX
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; Set Stack Pointer (SP) to the start of the boot sector.
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mov BX, Mem_BootSector_Start
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mov SP, BX
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; String testing
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String_Out TestStr, [TestStr_len]
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mov AH, BIOS_Wait
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mov CX, 0x02
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int SystemService
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; Hex Testing
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String_Out HexTest, [HexTest_len]
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Hex16_ToString [HexNumA], HexStringA
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Hex16_ToString [HexNumB], HexStringB
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String_Out ResultStr, [ResultStr_len]
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String_Out HexStringA, 4
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String_Out HexStringB, 4
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mov AH, BIOS_Wait
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mov CX, 0x10
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int SystemService
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Char_Out char_LF
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Char_Out char_CR
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DumpOut 0x7C00, 512
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; Idle
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hang :
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jmp short hang
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%include "AAL.x86.routines.s"
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;=============================================================================================================
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; Data
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;=============================================================================================================
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TestStr : db 'String Test', char_LF, char_CR
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TestStr_len : dw 13
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HexTest : db 'Hex Test', char_LF, char_CR
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HexTest_len : dw 10
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HexNumA : dw 0x1994
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HexNumB : dw 0x2022
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HexStringA : db '0000'
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HexStringB : db '0000'
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ResultStr : db 'Result: '
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ResultStr_len : db 8
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;=============================================================================================================
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; Wrap up
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;=============================================================================================================
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; Byte pad 512 bytes (zeroed)
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times 510-$+start db 0
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; Master Boot Record signature
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db 0x55
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db 0xAA
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