matos/drivers/vga.c

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#include "vga.h"
#include "io.h"
#include "klibc.h"
static uint vgaBgColor;
static uint vgaColor;
static int line, col;
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int VGASetup(uint bgColor, uint color)
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{
vgaBgColor = bgColor;
vgaColor = color;
clearScreen(bgColor);
line = 0;
col = 0;
return 0;
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}
void clearScreen(uint bgColor)
{
volatile short *vga = (short *)VGA_ADDR;
long int colorAttr = bgColor << 12;
for (int i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) {
vga[i] = colorAttr;
}
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}
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void clearScreenLine(uint bgColor, uint line)
{
volatile short *vga = (short *)VGA_ADDR;
long int colorAttr = bgColor << 12;
for (uint i = VGA_WIDTH * line; i < VGA_WIDTH * (line + 1); i++) {
vga[i] = colorAttr;
}
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}
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void printIntDetails(int integer, uint color, uint bgColor, int startX, int startY)
{
char num[sizeof(int) * 3]; // int max is 2^(sizeof(int)*8) which is (2^3)^(sizeof(int)*8/3)
// = 8^(sizeof(int)*8/3) ~ 10^(sizeof(int)*8/3)
int x = startX;
int i = 0, k = 0;
if (integer < 0) {
printCharDetails('-', color, bgColor, x++, startY);
}
if (integer == 0) {
num[i++] = 0;
}
while (integer != 0) {
int digit = integer % 10;
num[i++] = (digit > 0) ? digit : -digit;
integer = integer / 10;
}
for (k = i - 1; k >= 0; k--) {
printCharDetails(num[k] + '0', color, bgColor, x++, startY);
}
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}
void printCharDetails(const char str, uint color, uint bgColor, int startX, int startY)
{
volatile short *vga = (short *)VGA_ADDR;
long int colorAttr = (bgColor << 4 | (color & 0x0f)) << 8;
vga[VGA_WIDTH * startY + startX] = colorAttr | str;
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}
void vgaScrollUp(void)
{
long int colorAttr = vgaBgColor << 12;
volatile short *vga = (short *)VGA_ADDR;
for (int i = 1; i < VGA_HEIGHT - 1; i++) { // last line is status line. Do not scroll it
memcpy((void *)&vga[VGA_WIDTH * (i - 1)], (void *)&vga[VGA_WIDTH * i],
VGA_WIDTH * sizeof(short));
}
for (int i = 0; i < VGA_WIDTH; i++) {
vga[(VGA_HEIGHT - 2) * VGA_WIDTH + i] = colorAttr;
}
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}
void VGAputc(const char str)
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{
if (str == '\n') {
line++;
col = 0;
if (line >= VGA_HEIGHT - 1) {
vgaScrollUp();
line--;
}
} else if (str == '\r') {
col = 0;
} else if (str == '\b') {
col--;
if (col < 0) {
col = VGA_WIDTH - 1;
line--;
}
printCharDetails(' ', vgaColor, vgaBgColor, col, line);
} else {
printCharDetails(str, vgaColor, vgaBgColor, col++, line);
if (col == VGA_WIDTH) {
col = 0;
line++;
}
if (line >= VGA_HEIGHT - 1) {
vgaScrollUp();
line--;
}
}
cursorMove(col, line);
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}
void printStringDetails(const char *str, uint color, uint bgColor, int startX, int startY)
{
volatile short *vga = (short *)VGA_ADDR;
int i = 0;
long int colorAttr = (bgColor << 4 | (color & 0x0f)) << 8;
while (*str) {
vga[VGA_WIDTH * startY + startX + i] = colorAttr | *str;
str++;
i++;
}
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}
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void cursorEnable(uint8_t cursor_start, uint8_t cursor_end)
{
outb(0x3D4, 0x0A);
outb(0x3D5, (inb(0x3D5) & 0xC0) | cursor_start);
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outb(0x3D4, 0x0B);
outb(0x3D5, (inb(0x3D5) & 0xE0) | cursor_end);
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}
void cursorDisable(void)
{
outb(0x3D4, 0x0A);
outb(0x3D5, 0x20);
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}
void cursorMove(int x, int y)
{
volatile short *vga = (short *)VGA_ADDR;
long int colorAttr = (vgaBgColor << 4 | (vgaColor & 0x0f)) << 8;
uint16_t pos = y * VGA_WIDTH + x;
vga[pos] = colorAttr;
outb(0x3D4, 0x0F);
outb(0x3D5, (uint8_t)(pos & 0xFF));
outb(0x3D4, 0x0E);
outb(0x3D5, (uint8_t)((pos >> 8) & 0xFF));
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}