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os-k/boot/loader/io/lmterm.asm

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2019-01-16 11:04:44 +01:00
;=----------------------------------------------------------------------------=;
; GNU GPL OS/K ;
; ;
; Authors: spectral` ;
; NeoX ;
; ;
; Desc: Basic Colored VGA Terminal Long mode Driver ;
; (x86_64 architecture only) ;
;=----------------------------------------------------------------------------=;
;;VIDEO
%define TRAM 0x0B8000 ; [T]ext[RAM]
%define VRAM 0x0A0000 ; [V]ideo[RAM]
;; GLOBAL DATA
VGA_HEIGHT dq 0
VIDEO_MODE dw 0
VIDEO_MODE32 dw 0
VGA_HEIGHT32 dw 0
NextTRAM dq 0x0B8000 ; Last position of cursor
VIDEO_MODE64 dq 0
VGA_HEIGHT64 dq 0
VGA_X dq 0
;; TEXT
[BITS 64]
clear:
;-----------------------------------------------------------------------;
; x64/LM Clear Text Screen Function ;
;-----------------------------------------------------------------------;
mov qword [NextTRAM], TRAM
mov edi, TRAM
push rsi
push rdi
push rcx
mov ah, 0
mov al, 0
mov rcx, 0x4000 ; traditionnal value
rep stosw ; fill screen with al while cx > 0
pop rcx
pop rsi
pop rdi
ret
write:
;-----------------------------------------------------------------------;
; x64/LM Text Printing Functions ;
; bl : color code ;
; esi : string address ;
;-----------------------------------------------------------------------;
mov edi, [NextTRAM] ; TRAM ADDRESS
push rsi
push rdi
.pLoop:
lodsb
cmp al, 0 ; while @al, i.e. while we're not hitting '\0'
je .pEnd
cmp al, 0x0A ; LF
je .lf
cmp al, 0x0D ; CR
je .cr
stosb ; text subpixel
mov al, bl
stosb ; color subpixel
add qword [NextTRAM], 0x2 ; Cursor moving
add qword [VGA_X], 0x2 ; coord + 2 because 2 subpixels
jmp .pLoop
.pEnd:
pop rdi
pop rsi
ret
.lf:
mov rax, [VGA_HEIGHT64]
add [NextTRAM], rax ; Cursor moving
add [NextTRAM], rax
add edi, eax ; Address moving
add edi, eax
jmp .pLoop
.cr:
push rax
mov rax, qword [VGA_X]
sub qword [NextTRAM], rax ; pos = X + Y * VGA_HEIGHT64. Donc pos - X = début de ligne
sub edi, edx
mov qword [VGA_X], 0
pop rax
jmp .pLoop
.scroll:
; XXX I don't think I'll implement this, but never know...;
jmp .pLoop
dump:
;-----------------------------------------------------------------------;
; x64/LM Dump Printing Functions ;
; bl : color code ;
; esi : string address ;
;-----------------------------------------------------------------------;
mov edi, [NextTRAM] ; TRAM ADDRESS
push rsi
push rdi
push rcx
mov rcx, 512
.pLoop:
lodsb
stosb ; text subpixel
mov al, bl
stosb ; color subpixel
add qword [NextTRAM], 0x2 ; Cursor moving
add qword [VGA_X], 0x2 ; coord + 2 because 2 subpixels
loop .pLoop
pop rcx
pop rdi
pop rsi
ret