Add ability to print numbers in decimal

[nameless-os.git] / kernel / kernel.c

diff --git a/kernel/kernel.c b/kernel/kernel.c
index e04b875e2959b5963e7c6f4ba394abba1f5f0be5..16b2b404e9f009fbe4e0ed912612152c6b3aa3aa 100644 (file)
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -1,5 +1,67 @@
-void _start(void)
+#include <tty.h>
+#include <io.h>
+#include <irq/idt.h>
+#include <irq/i8259a.h>
+#include <stdint.h>
+#include <mm/paging.h>
+
+struct abort_frame;
+struct interrupt_frame;
+struct fault_frame;
+extern void double_fault(struct abort_frame *frame);
+extern void keyb_handler(struct interrupt_frame *frame);
+extern void pf_handler(struct fault_frame *frame);
+static struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
+static struct idtr idtr __attribute__((aligned(0x10)));
+
+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)
 {
-       char *video_memory = (char *) 0xB8000; /* VGA VRAM starts at 0xB8000 */
-       *video_memory = 'A'; /* put an A at the beginning of the VRAM */
+       kprint("       Base       |      Length      |   Type   |  Attrib  |\n", 0);
+       kprint("------------------------------------------------------------\n", 0);
+       for (int i=0; i<mmap_size; i++) {
+               kprintq(mmap[i].base);
+               kprintc('|', 0);
+               kprintq(mmap[i].length);
+               kprintc('|', 0);
+               kprintd(mmap[i].type);
+               kprintc('|', 0);
+               kprintd(mmap[i].attrib);
+               kprintc('|', 0);
+               kprintc('\n', 0);
+       }
+}
+
+void kmain(struct e820_map *mmap, int mmap_size)
+{
+       screen_clear();
+       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);
+       idt_set_descriptor(idt, 8, 0x8, (uint32_t) double_fault, IDT_INTERRUPT_GATE, 0x0);
+       idt_set_descriptor(idt, 14, 0x8, (uint32_t) pf_handler, IDT_INTERRUPT_GATE, 0x0);
+       idt_set_descriptor(idt, 33, 0x8, (uint32_t) keyb_handler, IDT_INTERRUPT_GATE, 0x0);
+       kprint("IDT prepared, loading...\n", 0);
+       populate_idtr(&idtr, idt);
+       load_idt(idtr);
+       kprint("IDT loaded, enabling interrupts...\n", 0);
+       pic_init(0x20, 0x28);
+       pic_mask_all();
+       pic_unmask(1);
+       asm volatile ("sti");
+       kprint("All done\n", 0);
+       kprintdec(12345);
+       kprintc('\n');
+       kprintdec(6789);
+       kprintc('\n');
+       while(1);
 }