Text Mode Cursor: Difference between revisions
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==Disabling The Cursor Without the BIOS== |
==Disabling The Cursor Without the BIOS== |
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To diable the cursor without the bios we need to use vga's 0x3d4 index port and his data register located one port above it, we need to set bits 5-0 of register index 0x0a , the LOW cursor shape (we don't need to alter the HIGH cursor shape, he doesn't contain the 'cursor disable' bit inside him .), here's how it translate into code: |
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===Source in C=== |
===Source in C=== |
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<source lang="c"> |
<source lang="c"> |
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{ |
{ |
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outb(0x3D4, 0x0A); |
outb(0x3D4, 0x0A); // LOW cursor shape port to vga INDEX register |
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outb(0x3D5, 0x3f); //bits 6-7 must be 0 , if bit 5 set the cursor is disable , bits 0-4 controll the cursor shape . |
outb(0x3D5, 0x3f); //bits 6-7 must be 0 , if bit 5 set the cursor is disable , bits 0-4 controll the cursor shape . |
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// LOW cursor shape port to vga INDEX register |
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} |
} |
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</source> |
</source> |
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<source lang="asm"> |
<source lang="asm"> |
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; |
;written by Elad Ashkcenazi. |
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;year - 2017 |
;year - 2017 |
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;========================================================== |
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disable_cursor: pushf |
disable_cursor: pushf |
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push rax |
push rax |
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