#include <tty.h>
+#include <io.h>
+#include <irq/idt.h>
+#include <irq/interrupt.h>
+#include <irq/i8259a.h>
+#include <stdint.h>
+#include <mm/paging.h>
+#include <panic.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);
+
+struct e820_map {
+ uint64_t base;
+ uint64_t length;
+ uint32_t type;
+ uint32_t attrib;
+};
+
+void print_e820(struct e820_map *mmap, int mmap_size)
+{
+ kprint(" Base | Length | Type | Attrib |\n", 0);
+ kprint("------------------------------------------------------------\n", 0);
+ for (int i=0; i<mmap_size; i++) {
+ kprintq(mmap[i].base, 1);
+ kprintc('|', 0);
+ kprintq(mmap[i].length, 1);
+ kprintc('|', 0);
+ kprintd(mmap[i].type, 1);
+ kprintc('|', 0);
+ kprintd(mmap[i].attrib, 1);
+ kprintc('|', 0);
+ kprintc('\n', 0);
+ }
+}
+
+/* Small handler for double faults. Will be put elsewhere eventually. */
+int double_fault_handler(struct interrupt_frame *frame)
+{
+ kprint("Double fault occurred!\n", VGA_COLOR_BRIGHT_RED);
+ kprint("EAX: ", 0);
+ kprintd(frame->eax, 1);
+ kprintc(' ', 0);
+ kprint("EBX: ", 0);
+ kprintd(frame->ebx, 1);
+ kprintc(' ', 0);
+ kprint("ECX: ", 0);
+ kprintd(frame->ecx, 1);
+ kprintc(' ', 0);
+ kprint("EDX: ", 0);
+ kprintd(frame->edx, 1);
+ kprintc('\n', 0);
+ kprint("EBP: ", 0);
+ kprintd(frame->ebp, 1);
+ kprintc(' ', 0);
+ kprint("ESP: ", 0);
+ kprintd(frame->esp, 1);
+ kprintc('\n', 0);
+ kprint("ESI: ", 0);
+ kprintd(frame->esi, 1);
+ kprintc(' ', 0);
+ kprint("EDI: ", 0);
+ kprintd(frame->edi, 1);
+ kprintc('\n', 0);
+ kprint("EIP: ", 0);
+ kprintd(frame->eip, 1);
+ kprintc(' ', 0);
+ kprint("EFLAGS: ", 0);
+ kprintd(frame->eflags, 1);
+ kprintc('\n', 0);
+ PANIC("double fault");
+}
+
+void kmain(struct e820_map *mmap, int mmap_size)
{
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("BIOS memory map:\n", 0);
+ print_e820(mmap, mmap_size);
+ 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();
+ asm volatile ("sti");
+ kprint("All done\n", 0);
+ while(1);
}