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https://github.com/RGBCube/serenity
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018da1be11
Add a separate lock to protect the VFS. I think this might be a good idea. I'm not sure it's a good approach though. I'll fiddle with it as I go along. It's really fun to figure out all these things on my own.
74 lines
1.3 KiB
C++
74 lines
1.3 KiB
C++
#include "types.h"
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#include "VGA.h"
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#include "i386.h"
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#include "IO.h"
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#include "StdLib.h"
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#include "Task.h"
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PRIVATE BYTE *vga_mem = 0L;
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PRIVATE BYTE current_attr = 0x07;
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void vga_scroll_up()
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{
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memcpy(vga_mem, vga_mem + 160, 160 * 24);
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memset(vga_mem + (160 * 24), 0, 160);
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}
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void vga_putch_at(byte row, byte column, byte ch)
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{
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word cur = (row * 160) + (column * 2);
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vga_mem[cur] = ch;
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vga_mem[cur + 1] = current_attr;
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}
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void vga_set_attr(BYTE attr)
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{
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current_attr = attr;
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}
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byte vga_get_attr()
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{
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return current_attr;
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}
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void vga_init()
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{
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current_attr = 0x07;
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vga_mem = (byte*)0xb8000;
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for (word i = 0; i < (80 * 25); ++i) {
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vga_mem[i*2] = ' ';
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vga_mem[i*2 + 1] = 0x07;
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}
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vga_set_cursor(0);
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}
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WORD vga_get_cursor()
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{
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WORD value;
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IO::out8(0x3d4, 0x0e);
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value = IO::in8(0x3d5) << 8;
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IO::out8(0x3d4, 0x0f);
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value |= IO::in8(0x3d5);
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return value;
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}
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void vga_set_cursor(WORD value)
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{
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if (value >= (80 * 25)) {
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/* XXX: If you try to move the cursor off the screen, I will go reddish pink! */
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vga_set_cursor(0);
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current_attr = 0x0C;
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return;
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}
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IO::out8(0x3d4, 0x0e);
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IO::out8(0x3d5, MSB(value));
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IO::out8(0x3d4, 0x0f);
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IO::out8(0x3d5, LSB(value));
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}
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void vga_set_cursor(BYTE row, BYTE column)
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{
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vga_set_cursor(row * 80 + column);
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}
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