58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
void clear_screen();
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void set_curpos(int x, int y);
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void print(const char* string);
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unsigned char* VMEM_ADDR = (unsigned char*)0xb8000;
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const int TERM_WIDTH = 80;
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const int TERM_HEIGHT = 25;
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int cursor_x = 0;
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int cursor_y = 0;
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int main() {
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asm(
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"mov $0x10, %ax\n"
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"mov %ax, %ds\n"
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"mov %ax, %ss\n"
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"mov $0x90000, %esp"
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);
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clear_screen();
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set_curpos(0, 0);
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print("Hello, World!\n\nWe are running XnoeOS Code in C now, Protected Mode has been achieved and everything is working super nicely!\n\nHow wonderful!\n\nNow I just need to hope my print function works properly too~~");
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while (1) {}
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}
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void clear_screen() {
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for (int i=0; i<TERM_WIDTH*TERM_HEIGHT; i++) {
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VMEM_ADDR[i*2] = 0x20;
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VMEM_ADDR[i*2 + 1] = 0x07;
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}
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}
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void set_curpos(int x, int y) {
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cursor_x = x;
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cursor_y = y;
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}
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void print(const char* string) {
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int index = 0;
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char current;
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while (current=string[index++]) {
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if (current == '\n') {
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set_curpos(0, cursor_y+1);
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continue;
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}
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int mem_pos = cursor_y * TERM_WIDTH + cursor_x++;
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VMEM_ADDR[mem_pos*2] = current;
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VMEM_ADDR[mem_pos*2 + 1] = 0x07;
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if (index == TERM_WIDTH) {
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cursor_x = 0;
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cursor_y++;
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}
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}
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} |