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Added terminal init method.

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This commit is contained in:
neviyn 2017-10-20 18:00:17 +01:00
parent e37ad43bb2
commit 30c76c17c9
1 changed files with 14 additions and 3 deletions
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17
kernel.nim
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@ -17,12 +17,23 @@ type
lightBrown = 14, lightBrown = 14,
white = 15 white = 15
proc vga_entry_colour(fg: VGA_Colour, bg: VGA_Colour): uint8 = proc vgaEntryColour(fg: VGA_Colour, bg: VGA_Colour): uint8 =
result = uint8(ord(fg) or (ord(bg) shl 4)) result = uint8(ord(fg) or (ord(bg) shl 4))
proc vga_entry(c: char, colour: uint8): uint16 = proc vgaEntry(c: char, colour: uint8): uint16 =
result = uint8(c) or (colour shl 8) result = uint16(uint8(c) or (colour shl 8))
const const
vgaWidth = 80 vgaWidth = 80
vgaHeight = 25 vgaHeight = 25
terminalBufferBaseAddress = 0xB8000
var
terminalRow, terminalColumn = 0
terminalColour = vgaEntryColour(VGA_Colour.lightGrey, VGA_Colour.black)
proc terminalInitialize() =
for y in 0..<vgaWidth:
for x in 0..<vgaHeight:
let index = terminalBufferBaseAddress + (y * vgaWidth + x)
cast[ptr uint16](index)[] = vgaEntry(' ', terminalColour) # Write directly to display memory