+#include <stdint.h>
#include <tty.h>
+#include <io.h>
+#include <irq/idt.h>
+#include <irq/interrupt.h>
+#include <irq/i8259a.h>
+#include <input/ps2.h>
-void _start(void)
+struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
+struct idtr idtr __attribute__((aligned(0x10)));
+extern void (*_int_handler_table[48])(void);
+
+/* Small handler for double faults. Will be put elsewhere eventually. */
+int double_fault_handler(struct interrupt_frame *frame)
+{
+ kprint("PANIC: Double fault occurred!\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EAX: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->eax);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EBX: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->ebx);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("ECX: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->ecx);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EDX: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->edx);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EBP: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->ebp);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("ESP: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->esp);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("ESI: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->esi);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EDI: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->edi);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EIP: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->eip);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EFLAGS: ", VGA_COLOR_BRIGHT_RED);
+ kprintd(frame->eflags);
+ kprint("\n", VGA_COLOR_BRIGHT_RED);
+
+ /* IF has already been cleared for us */
+halt:
+ asm("hlt");
+ goto halt;
+}
+
+void kmain(void)
{
+ int ps2_success;
screen_clear();
- kprint("Hello there!\n\n\
- Hopefully your machine manages to print this text.\n\
- If it did, that's great news because I managed to write a partial VGA driver.\n\n\
- Right now, the short-term roadmap is as follows:\n\n\
- * Enable interrupts using the PIC.\n\
- * Write a driver for the Intel 8042 PS/2 controller so the OS can receive keystrokes.\n\
- * A working i8042 driver will also aid in enabling A20 Gate, which should be done ASAP so the OS can address odd (as in odd/even number) megabytes.\n\n\
- Feel free to mess around with the code, although I doubt it will be very interesting at the moment.\n");
+ kprint("Welcome to Nameless OS!\nRunning revision: ", 0);
+ kprint(GIT_COMMIT, 0);
+ kprint("\n", 0);
+ kprint("Preparing IDT...\n", 0);
+ for (int i=0; i<48; i++) {
+ idt_set_descriptor(idt, i, 0x8, _int_handler_table[i], IDT_INTERRUPT_GATE, 0);
+ }
+ kprint("IDT prepared, loading...\n", 0);
+ populate_idtr(&idtr, idt);
+ load_idt(idtr);
+ kprint("Setting up interrupts...\n", 0);
+ register_interrupt(8, &double_fault_handler);
+ pic_init(0x20, 0x28);
+ pic_mask_all();
+ ps2_success = ps2_initialize();
+ switch (ps2_success) {
+ case -1:
+ kprint("No PS/2 devices found or working, we will have no input\n", 0);
+ break;
+ case 0:
+ kprint("Found one working PS/2 device\n", 0);
+ break;
+ case 1:
+ kprint("Found two working PS/2 devices\n", 0);
+ }
+ asm volatile ("sti");
+ kprint("All done\n", 0);
+ while(1);
}