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38 lines
928 B
C++
38 lines
928 B
C++
#include "cga.h"
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#include "arch/ioport.h"
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namespace CGA {
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IOPort index_port = IOPort(0x3d4);
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IOPort data_port = IOPort(0x3d5);
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void writeCGAReg(int reg, int data){
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index_port.outb(reg);
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data_port.outw(data);
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}
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uint16_t readCGAReg(int reg){
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index_port.outb(reg);
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return data_port.inb();
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}
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void setCursor(unsigned abs_x, unsigned abs_y) {
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uint16_t pos = abs_y * COLUMNS + abs_x;
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writeCGAReg(RegisterIndex::CURSOR_LOW, pos & 0xFF);
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writeCGAReg(RegisterIndex::CURSOR_HIGH, ((pos >> 8) & 0xFF));
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}
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void getCursor(unsigned& abs_x, unsigned& abs_y) {
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uint16_t pos = readCGAReg(RegisterIndex::CURSOR_LOW);
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pos |= (readCGAReg(RegisterIndex::CURSOR_HIGH) << 8);
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abs_y = pos / COLUMNS;
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abs_x = pos % COLUMNS;
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}
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void show(unsigned abs_x, unsigned abs_y, char character, Attribute attrib) {
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TEXT_BUFFER_BASE[abs_x + (COLUMNS * abs_y)] = Cell(character, attrib);
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}
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}; // namespace CGA
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