117 lines
3.9 KiB
NASM
117 lines
3.9 KiB
NASM
;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Authors: spectral` ;
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; NeoX ;
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; ;
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; Desc: Basic Colored VGA Terminal Long mode Driver ;
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; (x86_64 architecture only) ;
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;=----------------------------------------------------------------------------=;
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;;VIDEO
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%define TRAM 0x0B8000 ; [T]ext[RAM]
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%define VRAM 0x0A0000 ; [V]ideo[RAM]
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;; GLOBAL DATA
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VGA_HEIGHT dq 0
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VIDEO_MODE dw 0
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VIDEO_MODE32 dw 0
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VGA_HEIGHT32 dw 0
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NextTRAM dq 0x0B8000 ; Last position of cursor
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VIDEO_MODE64 dq 0
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VGA_HEIGHT64 dq 0
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VGA_X dq 0
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;; TEXT
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[BITS 64]
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clear:
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;-----------------------------------------------------------------------;
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; x64/LM Clear Text Screen Function ;
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;-----------------------------------------------------------------------;
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mov qword [NextTRAM], TRAM
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mov edi, TRAM
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push rsi
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push rdi
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push rcx
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mov ah, 0
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mov al, 0
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mov rcx, 0x4000 ; traditionnal value
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rep stosw ; fill screen with al while cx > 0
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pop rcx
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pop rsi
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pop rdi
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ret
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write:
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;-----------------------------------------------------------------------;
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; x64/LM Text Printing Functions ;
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; bl : color code ;
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; esi : string address ;
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;-----------------------------------------------------------------------;
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mov edi, [NextTRAM] ; TRAM ADDRESS
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push rsi
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push rdi
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.pLoop:
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lodsb
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cmp al, 0 ; while @al, i.e. while we're not hitting '\0'
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je .pEnd
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cmp al, 0x0A ; LF
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je .lf
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cmp al, 0x0D ; CR
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je .cr
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stosb ; text subpixel
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mov al, bl
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stosb ; color subpixel
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add qword [NextTRAM], 0x2 ; Cursor moving
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add qword [VGA_X], 0x2 ; coord + 2 because 2 subpixels
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jmp .pLoop
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.pEnd:
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pop rdi
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pop rsi
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ret
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.lf:
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mov rax, [VGA_HEIGHT64]
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add [NextTRAM], rax ; Cursor moving
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add [NextTRAM], rax
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add edi, eax ; Address moving
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add edi, eax
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jmp .pLoop
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.cr:
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push rax
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mov rax, qword [VGA_X]
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sub qword [NextTRAM], rax ; pos = X + Y * VGA_HEIGHT64. Donc pos - X = début de ligne
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sub edi, edx
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mov qword [VGA_X], 0
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pop rax
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jmp .pLoop
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.scroll:
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; XXX I don't think I'll implement this, but never know...;
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jmp .pLoop
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dump:
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;-----------------------------------------------------------------------;
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; x64/LM Dump Printing Functions ;
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; bl : color code ;
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; esi : string address ;
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;-----------------------------------------------------------------------;
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mov edi, [NextTRAM] ; TRAM ADDRESS
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push rsi
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push rdi
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push rcx
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mov rcx, 512
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.pLoop:
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lodsb
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stosb ; text subpixel
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mov al, bl
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stosb ; color subpixel
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add qword [NextTRAM], 0x2 ; Cursor moving
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add qword [VGA_X], 0x2 ; coord + 2 because 2 subpixels
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loop .pLoop
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pop rcx
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pop rdi
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pop rsi
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ret
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