From bd7d4366b6643b5c6cd04f40dd32f5d9c9575fd6 Mon Sep 17 00:00:00 2001
From: Aleksa Vuckovic <aleksav013@gmail.com>
Date: Fri, 5 Aug 2022 14:33:51 +0200
Subject: organised files; switched to recursive make

---
 kernel/Makefile               |  37 +++++
 kernel/boot.S                 | 181 ---------------------
 kernel/boot64.S               |  19 ---
 kernel/debug.c                |   6 -
 kernel/graphics.c             | 119 --------------
 kernel/grub.cfg               |   8 -
 kernel/header.S               |  40 -----
 kernel/idt.c                  |  88 ----------
 kernel/include/debug.h        |   8 +
 kernel/include/font.h         | 369 ++++++++++++++++++++++++++++++++++++++++++
 kernel/include/graphics.h     |  34 ++++
 kernel/include/idt.h          |  34 ++++
 kernel/include/io.h           |   9 ++
 kernel/include/irq.h          |  58 +++++++
 kernel/include/keyboard.h     |   9 ++
 kernel/include/multiboot2.h   |  40 +++++
 kernel/include/pic.h          |  30 ++++
 kernel/io.c                   |  13 --
 kernel/irq.c                  | 289 ---------------------------------
 kernel/irq_stub.S             | 108 -------------
 kernel/kernel.ld              |  39 -----
 kernel/keyboard.c             |  20 ---
 kernel/main.c                 |  18 ---
 kernel/multiboot2.c           |  41 -----
 kernel/pic.c                  |  24 ---
 kernel/src/boot/boot.S        | 181 +++++++++++++++++++++
 kernel/src/boot/boot64.S      |  19 +++
 kernel/src/boot/header.S      |  40 +++++
 kernel/src/boot/multiboot2.c  |  41 +++++
 kernel/src/cpu/idt.c          |  88 ++++++++++
 kernel/src/cpu/io.c           |  13 ++
 kernel/src/cpu/irq.c          | 289 +++++++++++++++++++++++++++++++++
 kernel/src/cpu/irq_stub.S     | 108 +++++++++++++
 kernel/src/cpu/pic.c          |  24 +++
 kernel/src/devices/keyboard.c |  20 +++
 kernel/src/grub.cfg           |   8 +
 kernel/src/kernel.ld          |  39 +++++
 kernel/src/main.c             |  18 +++
 kernel/src/misc/debug.c       |   6 +
 kernel/src/misc/graphics.c    | 119 ++++++++++++++
 40 files changed, 1641 insertions(+), 1013 deletions(-)
 create mode 100644 kernel/Makefile
 delete mode 100644 kernel/boot.S
 delete mode 100644 kernel/boot64.S
 delete mode 100644 kernel/debug.c
 delete mode 100644 kernel/graphics.c
 delete mode 100644 kernel/grub.cfg
 delete mode 100644 kernel/header.S
 delete mode 100644 kernel/idt.c
 create mode 100644 kernel/include/debug.h
 create mode 100644 kernel/include/font.h
 create mode 100644 kernel/include/graphics.h
 create mode 100644 kernel/include/idt.h
 create mode 100644 kernel/include/io.h
 create mode 100644 kernel/include/irq.h
 create mode 100644 kernel/include/keyboard.h
 create mode 100644 kernel/include/multiboot2.h
 create mode 100644 kernel/include/pic.h
 delete mode 100644 kernel/io.c
 delete mode 100644 kernel/irq.c
 delete mode 100644 kernel/irq_stub.S
 delete mode 100644 kernel/kernel.ld
 delete mode 100644 kernel/keyboard.c
 delete mode 100644 kernel/main.c
 delete mode 100644 kernel/multiboot2.c
 delete mode 100644 kernel/pic.c
 create mode 100644 kernel/src/boot/boot.S
 create mode 100644 kernel/src/boot/boot64.S
 create mode 100644 kernel/src/boot/header.S
 create mode 100644 kernel/src/boot/multiboot2.c
 create mode 100644 kernel/src/cpu/idt.c
 create mode 100644 kernel/src/cpu/io.c
 create mode 100644 kernel/src/cpu/irq.c
 create mode 100644 kernel/src/cpu/irq_stub.S
 create mode 100644 kernel/src/cpu/pic.c
 create mode 100644 kernel/src/devices/keyboard.c
 create mode 100644 kernel/src/grub.cfg
 create mode 100644 kernel/src/kernel.ld
 create mode 100644 kernel/src/main.c
 create mode 100644 kernel/src/misc/debug.c
 create mode 100644 kernel/src/misc/graphics.c

(limited to 'kernel')

diff --git a/kernel/Makefile b/kernel/Makefile
new file mode 100644
index 0000000..8bdb9f7
--- /dev/null
+++ b/kernel/Makefile
@@ -0,0 +1,37 @@
+CFLAGS += -I include
+
+OBJS = \
+	src/boot/boot64.o \
+	src/boot/boot.o \
+	src/boot/header.o \
+	src/boot/multiboot2.o \
+	src/cpu/idt.o \
+	src/cpu/io.o \
+	src/cpu/irq.o \
+	src/cpu/irq_stub.o \
+	src/cpu/pic.o \
+	src/devices/keyboard.o \
+	src/main.o \
+	src/misc/debug.o \
+	src/misc/graphics.o \
+
+all: kernel.bin
+
+kernel.bin: $(OBJS) src/kernel.ld ../Makefile Makefile
+	$(info [kernel] $@)
+	@$(LD) $(LDFLAGS) -T src/kernel.ld $(OBJS) -o kernel.bin
+
+
+%.o: %.c
+	$(info [kernel] $@)
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+
+%.o: %.S
+	$(info [kernel] $@)
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+
+.PHONY: all
+
+-include $(OBJS:.o=.d)
diff --git a/kernel/boot.S b/kernel/boot.S
deleted file mode 100644
index ee35eeb..0000000
--- a/kernel/boot.S
+++ /dev/null
@@ -1,181 +0,0 @@
-.global _start
-.extern begin_long_mode
-
-.section .text
-.code32
-
-_start:
-	cli
-	mov $stack_top, %esp
-	pushl $0
-	pushl %eax
-	pushl $0
-	pushl %ebx
-
-	call check_multiboot
-	call check_cpuid
-	call check_long_mode
-
-	call setup_page_tables
-	call enable_paging
-
-	lgdt gdt_pointer
-	ljmp $0x08, $begin_long_mode
-
-
-check_multiboot:
-	cmp $0x36d76289, %eax
-	jne no_multiboot
-
-	ret
-
-check_cpuid:
-	pushfl
-	pop %eax
-	mov %eax, %ecx
-	xor $1<<21, %eax
-	push %eax
-	popfl
-	pushfl
-	pop %eax
-	push %ecx
-	popfl
-	cmp %eax, %ecx
-	je no_cpuid
-
-	ret
-
-check_long_mode:
-	mov $0x80000000, %eax
-	cpuid
-	cmp $0x80000001, %eax
-	jb no_long_mode
-
-	mov $0x80000001, %eax
-	cpuid
-	test $1<<29, %edx
-	jz no_long_mode
-
-	ret
-
-setup_page_tables:
-	mov $page_table_lvl3, %eax
-	or $0x3, %eax
-	mov %eax, page_table_lvl4
-
-	mov $page_table_lvl2, %eax
-	or $0x3, %eax
-	mov %eax, page_table_lvl3
-
-	mov $page_table_lvl2 + 4096, %eax
-	or $0x3, %eax
-	mov %eax, page_table_lvl3+8
-
-	mov $page_table_lvl2 + 8192, %eax
-	or $0x3, %eax
-	mov %eax, page_table_lvl3+16
-
-	mov $page_table_lvl2 + 12288, %eax
-	or $0x3, %eax
-	mov %eax, page_table_lvl3+24
-
-
-	movl $0, %ecx
-1:
-	movl $0x200000, %eax
-	mul %ecx
-	or $0b10000011, %eax
-	movl $page_table_lvl2, %edx
-	leal (%edx, %ecx, 8), %edx
-	movl %eax, (%edx)
-	inc %ecx
-	cmp $512*4, %ecx
-	jne 1b
-
-	ret
-
-enable_paging:
-	// enable PAE
-	mov %cr4, %edx
-	or $1<<5 ,%edx
-	mov %edx, %cr4
-
-	// set LME (long mode enable)
-	mov $0xC0000080, %ecx
-	rdmsr
-	or $1<<8, %eax
-	wrmsr
-
-	// page_table_lvl4
-	mov $page_table_lvl4, %eax
-	mov %eax, %cr3
-
-	// enable paging (+ protected mode if not already enabled)
-	mov %cr0, %eax
-	or $1<<31 + 1<<0, %eax
-	mov %eax, %cr0
-
-	ret
-
-no_multiboot:
-	hlt
-
-no_cpuid:
-	hlt
-
-no_long_mode:
-	hlt
-
-
-.section .bss
-.align 4096
-
-// stack
-stack_bottom:
-	.skip 4096*4
-stack_top:
-
-// page tables
-page_table_lvl4:
-	.skip 4096
-page_table_lvl3:
-	.skip 4096
-// map first 4GB
-page_table_lvl2:
-	.skip 4096*4
-
-// Access bits
-.section .rodata
-.set PRESENT,		1 << 7
-.set NOT_SYS,		1 << 4
-.set EXEC,		1 << 3
-.set DC,		1 << 2
-.set RW,		1 << 1
-.set ACCESSED,		1 << 0
-
-// Flags bits
-.set GRAN_4K,		1 << 7
-.set SZ_32,		1 << 6
-.set LONG_MODE,		1 << 5
-
-gdt:
-gdt_null = . - gdt
-	.quad 0
-gdt_code = . - gdt
-	.long 0xFFFF				// Limit & Base (low, bits 0-15)
-	.byte 0					// Base (mid, bits 16-23)
-	.byte PRESENT | NOT_SYS | EXEC | RW	// Access
-	.byte GRAN_4K | LONG_MODE | 0xF		// Flags & Limit (high, bits 16-19)
-	.byte 0					// Base (high, bits 24-31)
-gdt_data = . - gdt
-	.long 0xFFFF
-	.byte 0
-	.byte PRESENT | NOT_SYS | RW
-	.byte GRAN_4K | SZ_32 | 0xF
-	.byte 0
-gdt_tss = . - gdt
-	.long 0x00000068
-	.long 0x00CF8900
-gdt_pointer:
-	.word . - gdt - 1
-	.quad gdt
diff --git a/kernel/boot64.S b/kernel/boot64.S
deleted file mode 100644
index be87412..0000000
--- a/kernel/boot64.S
+++ /dev/null
@@ -1,19 +0,0 @@
-.global begin_long_mode
-
-.section .text
-.code64
-
-begin_long_mode:
-	// reload segment registers
-	mov $0x10, %eax
-	mov %eax, %ss
-	mov %eax, %ds
-	mov %eax, %es
-	mov %eax, %fs
-	mov %eax, %gs
-
-	popq %rdi
-	popq %rsi
-
-	call kernel_main
-	hlt
diff --git a/kernel/debug.c b/kernel/debug.c
deleted file mode 100644
index 5f3c327..0000000
--- a/kernel/debug.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <stdint.h>
-
-void bochs_breakpoint(void)
-{
-	__asm__ volatile ("xchgw %bx, %bx;");
-}
diff --git a/kernel/graphics.c b/kernel/graphics.c
deleted file mode 100644
index d4fc7c7..0000000
--- a/kernel/graphics.c
+++ /dev/null
@@ -1,119 +0,0 @@
-#include <stdint.h>
-#include <multiboot2.h>
-#include <graphics.h>
-#include <font.h>
-
-uint64_t* pixel_offset(fb_t fb, uint32_t x, uint32_t y)
-{
-	return (uint64_t*)((char*)fb.addr + y * fb.pitch + x * fb.bpp / 8);
-}
-
-void fb_draw_pixel(fb_t fb, uint32_t x, uint32_t y, uint32_t col)
-{
-	if (x >= fb.width || y >= fb.height) return;
-
-	uint32_t* fb_offset = (uint32_t*)pixel_offset(fb, x, y);
-	*fb_offset = col;
-}
-
-/* https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm */
-
-void fb_draw_line_low(fb_t fb, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t col)
-{
-	int32_t dx = x1 - x0;
-	int32_t dy = y1 - y0;
-	int32_t yi = 1;
-	if (dy < 0) {
-		yi = -1;
-		dy = -dy;
-	}
-	int32_t D = (2 * dy) - dx;
-	int32_t y = y0;
-
-	for (int32_t x = x0; x <= x1; x++) {
-		fb_draw_pixel(fb, x, y, col);
-		if (D > 0) {
-			y = y + yi;
-			D = D + (2 * (dy - dx));
-		} else {
-			D = D + 2 * dy;
-		}
-	}
-
-}
-
-void fb_draw_line_high(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col)
-{
-	int32_t dx = x1 - x0;
-	int32_t dy = y1 - y0;
-	int32_t xi = 1;
-	if (dx < 0) {
-		xi = -1;
-		dx = -dx;
-	}
-	int32_t D = (2 * dx) - dy;
-	int32_t x = x0;
-
-	for (int32_t y = y0; y <= y1; y++) {
-		fb_draw_pixel(fb, x, y, col);
-		if (D > 0) {
-			x = x + xi;
-			D = D + (2 * (dx - dy));
-		} else {
-			D = D + 2 * dx;
-		}
-	}
-}
-
-int32_t abs(int32_t val)
-{
-	if (val < 0) return -val;
-	return val;
-}
-
-void fb_draw_line(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col)
-{
-	if (abs(y1 - y0) < abs(x1 - x0)) {
-		if (x0 > x1)
-			fb_draw_line_low(fb, x1, y1, x0, y0, col);
-		else
-			fb_draw_line_low(fb, x0, y0, x1, y1, col);
-	} else {
-		if (y0 > y1)
-			fb_draw_line_high(fb, x1, y1, x0, y0, col);
-		else
-			fb_draw_line_high(fb, x0, y0, x1, y1, col);
-	}
-}
-
-void fb_draw_character(fb_t fb, char c, uint32_t x, uint32_t y, uint32_t char_col, uint32_t bg_col)
-{
-	if (c < 0) return;
-
-	uint32_t offset = 32 + c * 16;
-	for (uint32_t i = 0 ; i < 16; i++)
-	{
-		for (uint32_t j = 0 ; j < 8; j++)
-		{
-			if (font[offset + i] & (1 << (7 - j))) {
-				fb_draw_pixel(fb, x + j, y + i, char_col);
-			} else {
-				fb_draw_pixel(fb, x + j, y + i, bg_col);
-			}
-		}
-	}
-}
-
-uint32_t strlen(const char* s)
-{
-	char *p = (char*)s;
-	while (*p) p++;
-	return p - s;
-}
-
-void fb_draw_string(fb_t fb, const char* s, uint32_t x, uint32_t y, uint32_t char_col, uint32_t bg_col)
-{
-	for (uint32_t i = 0; i < strlen(s); i++) {
-		fb_draw_character(fb, s[i], x + i * 8, y, char_col, bg_col);
-	}
-}
diff --git a/kernel/grub.cfg b/kernel/grub.cfg
deleted file mode 100644
index 05a13f7..0000000
--- a/kernel/grub.cfg
+++ /dev/null
@@ -1,8 +0,0 @@
-set timeout=0
-set default=0
-
-insmod efi_gop
-menuentry "mykernel64" {
-	multiboot2 /boot/kernel.bin
-	boot
-}
diff --git a/kernel/header.S b/kernel/header.S
deleted file mode 100644
index bbcb9be..0000000
--- a/kernel/header.S
+++ /dev/null
@@ -1,40 +0,0 @@
-// multiboot tags
-.set TAG_END,		0
-.set TAG_FRAMEBUFFER,	5
-
-// multiboot flags
-.set TAG_REQUIRED,	0
-.set TAG_OPTIONAL,	1
-
-# multiboot2 header constants
-.set MAGIC,		0xe85250d6
-.set ARCH,		0
-.set HEADER_LENGTH,	(header_end - header_start)
-.set CHECKSUM,		0x100000000 - (MAGIC + ARCH + HEADER_LENGTH)
-
-.section .multiboot_header, "a"
-.align 4
-header_start:
-	# magic
-	.align 8
-	.long MAGIC
-	.long ARCH
-	.long HEADER_LENGTH
-	.long CHECKSUM
-
-	# framebuffer
-	.align 8
-	.word TAG_FRAMEBUFFER
-	.word TAG_REQUIRED
-	.long 20
-	.long 1024
-	.long 768
-	.long 32
-
-	# end tag
-	.align 8
-	.word TAG_END
-	.word TAG_REQUIRED
-	.long 8
-
-header_end:
diff --git a/kernel/idt.c b/kernel/idt.c
deleted file mode 100644
index bf285b7..0000000
--- a/kernel/idt.c
+++ /dev/null
@@ -1,88 +0,0 @@
-#include <idt.h>
-#include <irq.h>
-#include <pic.h>
-
-__attribute__((aligned(0x10))) static idt_entry idt_table[256];
-idtp idt_pointer;
-
-void load_idt(idtp* pointer)
-{
-	__asm__ volatile ("lidt (%0); sti;" : : "r"(pointer) : );
-}
-
-void add_to_idt(uint16_t num, uint64_t offset, uint16_t selector, uint8_t type)
-{
-	idt_table[num].offset_1 = offset & 0xFFFF;
-	idt_table[num].offset_2 = (offset >> 16) & 0xFFFF;
-	idt_table[num].offset_3 = offset >> 32;
-	idt_table[num].selector = selector;
-	idt_table[num].type_attributes = type;
-	idt_table[num].ist = 0;
-	idt_table[num].zero = 0;
-}
-
-void init_idt_table(void)
-{
-	// exceptions
-	add_to_idt(0, (uint64_t)isr0, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(1, (uint64_t)isr1, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(2, (uint64_t)isr2, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(3, (uint64_t)isr3, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(4, (uint64_t)isr4, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(5, (uint64_t)isr5, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(6, (uint64_t)isr6, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(7, (uint64_t)isr7, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(8, (uint64_t)isr8, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(9, (uint64_t)isr9, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(10, (uint64_t)isr10, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(11, (uint64_t)isr11, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(12, (uint64_t)isr12, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(13, (uint64_t)isr13, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(14, (uint64_t)isr14, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(15, (uint64_t)isr15, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(16, (uint64_t)isr16, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(17, (uint64_t)isr17, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(18, (uint64_t)isr18, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(19, (uint64_t)isr19, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(20, (uint64_t)isr20, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(21, (uint64_t)isr21, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(22, (uint64_t)isr22, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(23, (uint64_t)isr23, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(24, (uint64_t)isr24, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(25, (uint64_t)isr25, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(26, (uint64_t)isr26, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(27, (uint64_t)isr27, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(28, (uint64_t)isr28, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(29, (uint64_t)isr29, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(30, (uint64_t)isr30, GDT_CODE_SEG, TRAP_GATE);
-	add_to_idt(31, (uint64_t)isr31, GDT_CODE_SEG, TRAP_GATE);
-
-	// interrupts
-	add_to_idt(32, (uint64_t)irq0, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(33, (uint64_t)irq1, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(34, (uint64_t)irq2, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(35, (uint64_t)irq3, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(36, (uint64_t)irq4, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(37, (uint64_t)irq5, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(38, (uint64_t)irq6, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(39, (uint64_t)irq7, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(40, (uint64_t)irq8, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(41, (uint64_t)irq9, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(42, (uint64_t)irq10, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(43, (uint64_t)irq11, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(44, (uint64_t)irq12, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(45, (uint64_t)irq13, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(46, (uint64_t)irq14, GDT_CODE_SEG, INTERRUPT_GATE);
-	add_to_idt(47, (uint64_t)irq15, GDT_CODE_SEG, INTERRUPT_GATE);
-}
-
-void init_idt()
-{
-	init_idt_table();
-	idt_pointer.size = sizeof(idt_entry) * 256 - 1;
-	idt_pointer.offset = (uint64_t)&idt_table;
-
-	remap_pic();
-
-	load_idt(&idt_pointer);
-}
diff --git a/kernel/include/debug.h b/kernel/include/debug.h
new file mode 100644
index 0000000..ebe3a52
--- /dev/null
+++ b/kernel/include/debug.h
@@ -0,0 +1,8 @@
+#ifndef DEBUG_H
+#define DEBUG_H
+
+#include <stdint.h>
+
+void bochs_breakpoint(void);
+
+#endif
diff --git a/kernel/include/font.h b/kernel/include/font.h
new file mode 100644
index 0000000..678a6c2
--- /dev/null
+++ b/kernel/include/font.h
@@ -0,0 +1,369 @@
+#ifndef FONT_H
+#define FONT_H
+
+#include <stdint.h>
+
+#define PSF_FONT_MAGIC 0x864ab572
+
+typedef struct {
+    uint32_t magic;         /* magic bytes to identify PSF */
+    uint32_t version;       /* zero */
+    uint32_t headersize;    /* offset of bitmaps in file, 32 */
+    uint32_t flags;         /* 0 if there's no unicode table */
+    uint32_t numglyph;      /* number of glyphs */
+    uint32_t bytesperglyph; /* size of each glyph */
+    uint32_t height;        /* height in pixels */
+    uint32_t width;         /* width in pixels */
+} PSF_font;
+
+/* font i used: /usr/share/kbd/consolefonts/lat9-16.psf.gz */
+/* xxd -i font.psf */
+
+#endif
+unsigned char font[] = {
+  0x72, 0xb5, 0x4a, 0x86, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00,
+  0x10, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc3,
+  0x99, 0x99, 0xf3, 0xe7, 0xe7, 0xff, 0xe7, 0xe7, 0x7e, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0x00, 0x76, 0xdc, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6e, 0xf8, 0xd8, 0xd8, 0xdc, 0xd8,
+  0xd8, 0xd8, 0xf8, 0x6e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x6e, 0xdb, 0xdb, 0xdf, 0xd8, 0xdb, 0x6e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x88, 0xf8, 0x88, 0x88, 0x00, 0x3e,
+  0x08, 0x08, 0x08, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x80, 0xe0,
+  0x80, 0x80, 0x00, 0x3e, 0x20, 0x38, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x70, 0x88, 0x80, 0x88, 0x70, 0x00, 0x3c, 0x22, 0x3c, 0x24, 0x22,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0xf8, 0x00, 0x3e,
+  0x20, 0x38, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x11, 0x44, 0x11, 0x44,
+  0x11, 0x44, 0x11, 0x44, 0x11, 0x44, 0x11, 0x44, 0x11, 0x44, 0x11, 0x44,
+  0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa,
+  0x55, 0xaa, 0x55, 0xaa, 0xdd, 0x77, 0xdd, 0x77, 0xdd, 0x77, 0xdd, 0x77,
+  0xdd, 0x77, 0xdd, 0x77, 0xdd, 0x77, 0xdd, 0x77, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0xf0, 0xf0, 0xf0,
+  0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
+  0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
+  0x0f, 0x0f, 0x0f, 0x0f, 0x00, 0x88, 0xc8, 0xa8, 0x98, 0x88, 0x00, 0x20,
+  0x20, 0x20, 0x20, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x88, 0x50,
+  0x50, 0x20, 0x00, 0x3e, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x0e, 0x38, 0xe0, 0x38, 0x0e, 0x00, 0xfe, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x38, 0x0e, 0x38,
+  0xe0, 0x00, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06,
+  0x0c, 0xfe, 0x18, 0x30, 0xfe, 0x60, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x06, 0x1e, 0x7e, 0xfe, 0x7e, 0x1e, 0x06, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xf0, 0xfc, 0xfe,
+  0xfc, 0xf0, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c,
+  0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x0c, 0xfe,
+  0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x30, 0x60, 0xfe, 0x60, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x6c, 0xfe,
+  0x6c, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x06, 0x36, 0x66, 0xfe, 0x60, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x6c, 0x6c, 0x6c, 0x6c, 0x6c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c,
+  0x3c, 0x3c, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x66, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c,
+  0x6c, 0xfe, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x7c,
+  0xd6, 0xd0, 0xd0, 0x7c, 0x16, 0x16, 0xd6, 0x7c, 0x10, 0x10, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0xc2, 0xc6, 0x0c, 0x18, 0x30, 0x60, 0xc6, 0x86,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c, 0x6c, 0x38, 0x76, 0xdc,
+  0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x18,
+  0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x0c, 0x18, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x18, 0x0c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x18, 0x0c, 0x0c, 0x0c, 0x0c,
+  0x0c, 0x0c, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x66, 0x3c, 0xff, 0x3c, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x18, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x0c, 0x18,
+  0x30, 0x60, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
+  0xc6, 0xc6, 0xd6, 0xd6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x18, 0x38, 0x78, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0x06, 0x0c, 0x18, 0x30,
+  0x60, 0xc0, 0xc6, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
+  0x06, 0x06, 0x3c, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x0c, 0x1c, 0x3c, 0x6c, 0xcc, 0xfe, 0x0c, 0x0c, 0x0c, 0x1e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc0, 0xc0, 0xc0, 0xfc, 0x06,
+  0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x60,
+  0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0xfe, 0xc6, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x30, 0x30, 0x30,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7c, 0xc6,
+  0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
+  0xc6, 0xc6, 0x7e, 0x06, 0x06, 0x06, 0x0c, 0x78, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00,
+  0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06,
+  0x0c, 0x18, 0x30, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x00, 0xfe, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x30, 0x18, 0x0c, 0x06,
+  0x0c, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
+  0xc6, 0x0c, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xde, 0xde, 0xde, 0xdc, 0xc0, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x6c, 0xc6, 0xc6, 0xfe,
+  0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x66,
+  0x66, 0x66, 0x7c, 0x66, 0x66, 0x66, 0x66, 0xfc, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x3c, 0x66, 0xc2, 0xc0, 0xc0, 0xc0, 0xc0, 0xc2, 0x66, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x6c, 0x66, 0x66, 0x66, 0x66,
+  0x66, 0x66, 0x6c, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x66,
+  0x62, 0x68, 0x78, 0x68, 0x60, 0x62, 0x66, 0xfe, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0xfe, 0x66, 0x62, 0x68, 0x78, 0x68, 0x60, 0x60, 0x60, 0xf0,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x66, 0xc2, 0xc0, 0xc0, 0xde,
+  0xc6, 0xc6, 0x66, 0x3a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6,
+  0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x3c, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
+  0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe6, 0x66,
+  0x66, 0x6c, 0x78, 0x78, 0x6c, 0x66, 0x66, 0xe6, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0xf0, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x62, 0x66, 0xfe,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xee, 0xfe, 0xfe, 0xd6, 0xc6,
+  0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xe6,
+  0xf6, 0xfe, 0xde, 0xce, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x66, 0x66, 0x66, 0x7c, 0x60,
+  0x60, 0x60, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6,
+  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xd6, 0xde, 0x7c, 0x0c, 0x0e, 0x00, 0x00,
+  0x00, 0x00, 0xfc, 0x66, 0x66, 0x66, 0x7c, 0x6c, 0x66, 0x66, 0x66, 0xe6,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0x64, 0x38, 0x0c,
+  0x06, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x7e,
+  0x5a, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
+  0xc6, 0x6c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6,
+  0xc6, 0xc6, 0xd6, 0xd6, 0xd6, 0xfe, 0xee, 0x6c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0xc6, 0xc6, 0x6c, 0x7c, 0x38, 0x38, 0x7c, 0x6c, 0xc6, 0xc6,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0x66, 0x66, 0x66, 0x3c, 0x18,
+  0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xc6,
+  0x86, 0x0c, 0x18, 0x30, 0x60, 0xc2, 0xc6, 0xfe, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x3c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x60, 0x30,
+  0x18, 0x0c, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x0c,
+  0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x10, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x30, 0x30, 0x30,
+  0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x0c, 0x7c, 0xcc, 0xcc, 0xcc, 0x76,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x60, 0x60, 0x78, 0x6c, 0x66,
+  0x66, 0x66, 0x66, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0xc0, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x1c, 0x0c, 0x0c, 0x3c, 0x6c, 0xcc, 0xcc, 0xcc, 0xcc, 0x76,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xfe,
+  0xc0, 0xc0, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x6c,
+  0x64, 0x60, 0xf0, 0x60, 0x60, 0x60, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x7c,
+  0x0c, 0xcc, 0x78, 0x00, 0x00, 0x00, 0xe0, 0x60, 0x60, 0x6c, 0x76, 0x66,
+  0x66, 0x66, 0x66, 0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18,
+  0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
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+  0x60, 0x30, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x0c, 0x18, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
+  0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x6c, 0x00,
+  0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x6c, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x06, 0x0c, 0x00, 0x66, 0x66, 0x66, 0x66, 0x3c,
+  0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x60,
+  0x7c, 0x66, 0x66, 0x66, 0x66, 0x7c, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xcc, 0xc6, 0xc6, 0xc6, 0xd6, 0xdc,
+  0x80, 0x00, 0x00, 0x00, 0x00, 0x60, 0x30, 0x18, 0x00, 0x78, 0x0c, 0x7c,
+  0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x60,
+  0x00, 0x78, 0x0c, 0x7c, 0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x10, 0x38, 0x6c, 0x00, 0x78, 0x0c, 0x7c, 0xcc, 0xcc, 0xcc, 0x76,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0x00, 0x78, 0x0c, 0x7c,
+  0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6c,
+  0x00, 0x78, 0x0c, 0x7c, 0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x38, 0x6c, 0x38, 0x00, 0x78, 0x0c, 0x7c, 0xcc, 0xcc, 0xcc, 0x76,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xdb, 0x1b,
+  0x7f, 0xd8, 0xdb, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0xc0, 0xc6, 0x7c, 0x18, 0x6c, 0x38, 0x00,
+  0x00, 0x60, 0x30, 0x18, 0x00, 0x7c, 0xc6, 0xfe, 0xc0, 0xc0, 0xc6, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x18, 0x30, 0x00, 0x7c, 0xc6, 0xfe,
+  0xc0, 0xc0, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x6c,
+  0x00, 0x7c, 0xc6, 0xfe, 0xc0, 0xc0, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x6c, 0x00, 0x7c, 0xc6, 0xfe, 0xc0, 0xc0, 0xc6, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x30, 0x18, 0x00, 0x38, 0x18, 0x18,
+  0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x18, 0x30,
+  0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x18, 0x3c, 0x66, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6c, 0x00, 0x38, 0x18, 0x18,
+  0x18, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x30, 0x78,
+  0x0c, 0x7e, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x76, 0xdc, 0x00, 0xdc, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x30, 0x18, 0x00, 0x7c, 0xc6, 0xc6,
+  0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x18, 0x30,
+  0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x10, 0x38, 0x6c, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0xdc, 0x00, 0x7c, 0xc6, 0xc6,
+  0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6c,
+  0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x7e, 0x00, 0x18, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xce, 0xde,
+  0xfe, 0xf6, 0xe6, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x30, 0x18,
+  0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x18, 0x30, 0x60, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x76,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x78, 0xcc, 0x00, 0xcc, 0xcc, 0xcc,
+  0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcc,
+  0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x76, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x0c, 0x18, 0x30, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e,
+  0x06, 0x0c, 0xf8, 0x00, 0x00, 0x00, 0xf0, 0x60, 0x60, 0x7c, 0x66, 0x66,
+  0x66, 0x66, 0x7c, 0x60, 0x60, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6c,
+  0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x0c, 0xf8, 0x00
+};
+unsigned int font_len = 4128;
diff --git a/kernel/include/graphics.h b/kernel/include/graphics.h
new file mode 100644
index 0000000..84505d8
--- /dev/null
+++ b/kernel/include/graphics.h
@@ -0,0 +1,34 @@
+#ifndef GRAPHICS_H
+#define GRAPHICS_H
+
+#include <stdint.h>
+
+struct fb_t {
+	uint64_t addr;
+	uint32_t pitch;
+	uint32_t width;
+	uint32_t height;
+	uint8_t bpp;
+	uint8_t type;
+} __attribute__((packed, aligned(8)));
+typedef struct fb_t fb_t;
+
+extern fb_t fb;
+
+#define RED 	0x00ff0000
+#define GREEN	0x0000ff00
+#define BLUE	0x000000ff
+#define YELLOW	0x00ffff00
+#define PURPLE	0x00ff00ff
+#define WHITE	0x00ffffff
+#define BLACK	0x00000000
+
+uint64_t* pixel_offset(fb_t fb, uint32_t x, uint32_t y);
+void fb_draw_pixel(fb_t fb, uint32_t x, uint32_t y, uint32_t col);
+void fb_draw_line_low(fb_t fb, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t col);
+void fb_draw_line_high(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col);
+void fb_draw_line(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col);
+void fb_draw_character(fb_t fb, char c, uint32_t x, uint32_t y, uint32_t char_col, uint32_t bg_col);
+void fb_draw_string(fb_t fb, const char* str, uint32_t x, uint32_t y, uint32_t char_col, uint32_t bg_col);
+
+#endif
diff --git a/kernel/include/idt.h b/kernel/include/idt.h
new file mode 100644
index 0000000..9ca9c3a
--- /dev/null
+++ b/kernel/include/idt.h
@@ -0,0 +1,34 @@
+#ifndef IDT_H
+#define IDT_H
+
+#include <stdint.h>
+
+#define GDT_CODE_SEG	0x08
+
+#define INTERRUPT_GATE	0x8E
+#define TRAP_GATE	0x8F
+
+struct idt_entry {
+   uint16_t offset_1;        // offset bits 0..15
+   uint16_t selector;        // a code segment selector in GDT or LDT
+   uint8_t  ist;             // bits 0..2 holds Interrupt Stack Table offset, rest of bits zero.
+   uint8_t  type_attributes; // gate type, dpl, and p fields
+   uint16_t offset_2;        // offset bits 16..31
+   uint32_t offset_3;        // offset bits 32..63
+   uint32_t zero;            // reserved
+} __attribute__((packed));
+typedef struct idt_entry idt_entry;
+
+struct idtp {
+	uint16_t size;
+	uint64_t offset;
+} __attribute__((packed));
+typedef struct idtp idtp;
+
+void init_idt(void);
+void load_idt(idtp* pointer);
+void init_idt_table(void);
+void add_to_idt(uint16_t num, uint64_t offset, uint16_t selector, uint8_t type);
+
+
+#endif
diff --git a/kernel/include/io.h b/kernel/include/io.h
new file mode 100644
index 0000000..76c401d
--- /dev/null
+++ b/kernel/include/io.h
@@ -0,0 +1,9 @@
+#ifndef IO_H
+#define IO_H
+
+#include <stdint.h>
+
+uint8_t inb(uint32_t port);
+void outb(uint32_t port, uint8_t value);
+
+#endif
diff --git a/kernel/include/irq.h b/kernel/include/irq.h
new file mode 100644
index 0000000..f0e38d6
--- /dev/null
+++ b/kernel/include/irq.h
@@ -0,0 +1,58 @@
+#ifndef IRQ_H
+#define IRQ_H
+
+#include <stdint.h>
+
+// exceptions
+void isr0(void);
+void isr1(void);
+void isr2(void);
+void isr3(void);
+void isr4(void);
+void isr5(void);
+void isr6(void);
+void isr7(void);
+void isr8(uint64_t error);
+void isr9(void);
+void isr10(uint64_t error);
+void isr11(uint64_t error);
+void isr12(uint64_t error);
+void isr13(uint64_t error);
+void isr14(uint64_t error);
+void isr15(void);
+void isr16(void);
+void isr17(uint64_t error);
+void isr18(void);
+void isr19(void);
+void isr20(void);
+void isr21(uint64_t error);
+void isr22(void);
+void isr23(void);
+void isr24(void);
+void isr25(void);
+void isr26(void);
+void isr27(void);
+void isr28(void);
+void isr29(uint64_t error);
+void isr30(uint64_t error);
+void isr31(void);
+
+// interrupts
+void irq0(void);
+void irq1(void);
+void irq2(void);
+void irq3(void);
+void irq4(void);
+void irq5(void);
+void irq6(void);
+void irq7(void);
+void irq8(void);
+void irq9(void);
+void irq10(void);
+void irq11(void);
+void irq12(void);
+void irq13(void);
+void irq14(void);
+void irq15(void);
+
+#endif
diff --git a/kernel/include/keyboard.h b/kernel/include/keyboard.h
new file mode 100644
index 0000000..3a1b7f1
--- /dev/null
+++ b/kernel/include/keyboard.h
@@ -0,0 +1,9 @@
+#ifndef KEYBOARD_H
+#define KEYBOARD_H
+
+#define KEYBOARD_DATA_PORT	0x60
+#define KEYBOARD_STATUS_PORT	0x64
+
+void keyboard_handler(void);
+
+#endif
diff --git a/kernel/include/multiboot2.h b/kernel/include/multiboot2.h
new file mode 100644
index 0000000..f22fd8e
--- /dev/null
+++ b/kernel/include/multiboot2.h
@@ -0,0 +1,40 @@
+#ifndef MULTIBOOT2_H
+#define MULTIBOOT2_H
+
+#include <stdint.h>
+
+struct mb2_tag_header {
+	uint32_t type;
+	uint32_t size;
+} __attribute__((packed, aligned(8)));
+typedef struct mb2_tag_header mb2_tag_header;
+
+struct mb2_tag_fb {
+	uint32_t type;
+	uint32_t size;
+	uint64_t framebuffer_addr;
+	uint32_t framebuffer_pitch;
+	uint32_t framebuffer_width;
+	uint32_t framebuffer_height;
+	uint8_t framebuffer_bpp;
+	uint8_t framebuffer_type;
+} __attribute__((packed, aligned(8)));
+typedef struct mb2_tag_fb mb2_tag_fb;
+
+// multiboot2 magic check
+#define MB2_MAGIC		0x36D76289
+
+// multiboot2 tag
+#define MB2_TAG_END		0
+#define MB2_TAG_CMDLINE		1
+#define MB2_TAG_BOOTLOADER	2
+#define MB2_TAG_MODULES		3
+#define MB2_TAG_MEM		4
+#define MB2_TAG_BIOS		5
+#define MB2_TAG_MMAP		6
+#define MB2_TAG_VBE		7
+#define MB2_TAG_FB		8
+
+void init_fb(mb2_tag_header* multiboot_bootinfo, uint32_t multiboot_magic);
+
+#endif
diff --git a/kernel/include/pic.h b/kernel/include/pic.h
new file mode 100644
index 0000000..f1f4e44
--- /dev/null
+++ b/kernel/include/pic.h
@@ -0,0 +1,30 @@
+#ifndef PIC_H
+#define PIC_H
+
+#define PIC1			0x20		/* IO base address for master PIC */
+#define PIC2			0xA0		/* IO base address for slave PIC */
+#define PIC1_COMMAND		PIC1
+#define PIC1_DATA		(PIC1+1)
+#define PIC2_COMMAND		PIC2
+#define PIC2_DATA		(PIC2+1)
+
+#define PIC_EOI			0x20		/* End-of-interrupt command code */
+
+/* reinitialize the PIC controllers, giving them specified vector offsets
+   rather than 8h and 70h, as configured by default */
+
+#define ICW1_ICW4		0x01		/* ICW4 (not) needed */
+#define ICW1_SINGLE		0x02		/* Single (cascade) mode */
+#define ICW1_INTERVAL4		0x04		/* Call address interval 4 (8) */
+#define ICW1_LEVEL		0x08		/* Level triggered (edge) mode */
+#define ICW1_INIT		0x10		/* Initialization - required! */
+
+#define ICW4_8086		0x01		/* 8086/88 (MCS-80/85) mode */
+#define ICW4_AUTO		0x02		/* Auto (normal) EOI */
+#define ICW4_BUF_SLAVE		0x08		/* Buffered mode/slave */
+#define ICW4_BUF_MASTER		0x0C		/* Buffered mode/master */
+#define ICW4_SFNM		0x10		/* Special fully nested (not) */
+
+void remap_pic(void);
+
+#endif
diff --git a/kernel/io.c b/kernel/io.c
deleted file mode 100644
index 6bf67d0..0000000
--- a/kernel/io.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <stdint.h>
-
-uint8_t inb(uint32_t port)
-{
-	uint8_t ret;
-	__asm__ volatile ("inb %%dx, %%al" : "=a"(ret) : "d"(port));
-	return ret;
-}
-
-void outb(uint32_t port, uint8_t value)
-{
-	__asm__ volatile ("outb %%al, %%dx" : : "d"(port), "a"(value));
-}
diff --git a/kernel/irq.c b/kernel/irq.c
deleted file mode 100644
index 1e02f23..0000000
--- a/kernel/irq.c
+++ /dev/null
@@ -1,289 +0,0 @@
-#include <stdint.h>
-#include <pic.h>
-#include <io.h>
-#include <keyboard.h>
-#include <graphics.h>
-
-char* exception_name[] = {
-	"Divide-by-zero Error",
-	"Debug",
-	"Non-maskable Interrupt",
-	"Breakpoint",
-	"Overflow",
-	"Bound Range Exceeded",
-	"Invalid Opcode",
-	"Device Not Available",
-	"Double Fault",
-	"Coprocessor Segment Overrun",
-	"Invalid TSS",
-	"Segment Not Present",
-	"Stack-Segment Fault",
-	"General Protection Fault",
-	"Page Fault",
-	"Reserved",
-	"x87 Floating-Point Exception",
-	"Alignment Check",
-	"Machine Check",
-	"SIMD Floating-Point Exception",
-	"Virtualization Exception",
-	"Control Protection Exception",
-	"Reserved",
-	"Reserved",
-	"Reserved",
-	"Reserved",
-	"Reserved",
-	"Reserved",
-	"Hypervisor Injection Exception",
-	"VMM Communication Exception",
-	"Security Exception",
-	"Reserved",
-};
-
-void isr0_handler(void)
-{
-	fb_draw_string(fb, exception_name[0], 0, 0, WHITE, BLACK);
-}
-
-void isr1_handler(void)
-{
-	fb_draw_string(fb, exception_name[1], 0, 0, WHITE, BLACK);
-}
-
-void isr2_handler(void)
-{
-	fb_draw_string(fb, exception_name[2], 0, 0, WHITE, BLACK);
-}
-
-void isr3_handler(void)
-{
-	fb_draw_string(fb, exception_name[3], 0, 0, WHITE, BLACK);
-}
-
-void isr4_handler(void)
-{
-	fb_draw_string(fb, exception_name[4], 0, 0, WHITE, BLACK);
-}
-
-void isr5_handler(void)
-{
-	fb_draw_string(fb, exception_name[5], 0, 0, WHITE, BLACK);
-}
-
-void isr6_handler(void)
-{
-	fb_draw_string(fb, exception_name[6], 0, 0, WHITE, BLACK);
-}
-
-void isr7_handler(void)
-{
-	fb_draw_string(fb, exception_name[7], 0, 0, WHITE, BLACK);
-}
-
-void isr8_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[8], 0, 0, WHITE, BLACK);
-}
-
-void isr9_handler(void)
-{
-	fb_draw_string(fb, exception_name[9], 0, 0, WHITE, BLACK);
-}
-
-void isr10_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[10], 0, 0, WHITE, BLACK);
-}
-
-void isr11_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[11], 0, 0, WHITE, BLACK);
-}
-
-void isr12_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[12], 0, 0, WHITE, BLACK);
-}
-
-void isr13_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[13], 0, 0, WHITE, BLACK);
-}
-
-void isr14_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[14], 0, 0, WHITE, BLACK);
-}
-
-void isr15_handler(void)
-{
-	fb_draw_string(fb, exception_name[15], 0, 0, WHITE, BLACK);
-}
-
-void isr16_handler(void)
-{
-	fb_draw_string(fb, exception_name[16], 0, 0, WHITE, BLACK);
-}
-
-void isr17_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[17], 0, 0, WHITE, BLACK);
-}
-
-void isr18_handler(void)
-{
-	fb_draw_string(fb, exception_name[18], 0, 0, WHITE, BLACK);
-}
-
-void isr19_handler(void)
-{
-	fb_draw_string(fb, exception_name[19], 0, 0, WHITE, BLACK);
-}
-
-void isr20_handler(void)
-{
-	fb_draw_string(fb, exception_name[20], 0, 0, WHITE, BLACK);
-}
-
-void isr21_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[21], 0, 0, WHITE, BLACK);
-}
-
-void isr22_handler(void)
-{
-	fb_draw_string(fb, exception_name[22], 0, 0, WHITE, BLACK);
-}
-
-void isr23_handler(void)
-{
-	fb_draw_string(fb, exception_name[23], 0, 0, WHITE, BLACK);
-}
-
-void isr24_handler(void)
-{
-	fb_draw_string(fb, exception_name[24], 0, 0, WHITE, BLACK);
-}
-
-void isr25_handler(void)
-{
-	fb_draw_string(fb, exception_name[25], 0, 0, WHITE, BLACK);
-}
-
-void isr26_handler(void)
-{
-	fb_draw_string(fb, exception_name[26], 0, 0, WHITE, BLACK);
-}
-
-void isr27_handler(void)
-{
-	fb_draw_string(fb, exception_name[27], 0, 0, WHITE, BLACK);
-}
-
-void isr28_handler(void)
-{
-	fb_draw_string(fb, exception_name[28], 0, 0, WHITE, BLACK);
-}
-
-void isr29_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[29], 0, 0, WHITE, BLACK);
-}
-
-void isr30_handler(uint64_t error)
-{
-	fb_draw_string(fb, exception_name[30], 0, 0, WHITE, BLACK);
-}
-
-void isr31_handler(void)
-{
-	fb_draw_string(fb, exception_name[31], 0, 0, WHITE, BLACK);
-}
-
-void irq0_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq1_handler(void)
-{
-	keyboard_handler();
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq2_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq3_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq4_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq5_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq6_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq7_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-}
-
-void irq8_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
-
-void irq9_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
-
-void irq10_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
-
-void irq11_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
-
-void irq12_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
-
-void irq13_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
-
-void irq14_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
-
-void irq15_handler(void)
-{
-	outb(PIC1_COMMAND, PIC_EOI);
-	outb(PIC2_COMMAND, PIC_EOI);
-}
diff --git a/kernel/irq_stub.S b/kernel/irq_stub.S
deleted file mode 100644
index ddd197a..0000000
--- a/kernel/irq_stub.S
+++ /dev/null
@@ -1,108 +0,0 @@
-.macro pushall
-	push %rax
-	push %rcx
-	push %rdx
-	push %rsi
-	push %rdi
-	push %r8
-	push %r9
-	push %r10
-	push %r11
-	pushfq
-.endm
-
-.macro popall
-	popfq
-	pop %r11
-	pop %r10
-	pop %r9
-	pop %r8
-	pop %rdi
-	pop %rsi
-	pop %rdx
-	pop %rcx
-	pop %rax
-.endm
-
-
-.macro isr_no_error number
-.global isr\number
-isr\number:
-	pushall
-	cld
-	call isr\number\()_handler
-	popall
-	iretq
-.endm
-
-.macro isr_error number
-.global isr\number
-isr\number:
-	# rdi not saved
-	pop %rdi
-	pushall
-	cld
-	call isr\number\()_handler
-	popall
-	iretq
-.endm
-
-isr_no_error 0
-isr_no_error 1
-isr_no_error 2
-isr_no_error 3
-isr_no_error 4
-isr_no_error 5
-isr_no_error 6
-isr_no_error 7
-isr_error 8
-isr_no_error 9
-isr_error 10
-isr_error 11
-isr_error 12
-isr_error 13
-isr_error 14
-isr_no_error 15
-isr_no_error 16
-isr_error 17
-isr_no_error 18
-isr_no_error 19
-isr_no_error 20
-isr_no_error 21
-isr_no_error 22
-isr_no_error 23
-isr_no_error 24
-isr_no_error 25
-isr_no_error 26
-isr_no_error 27
-isr_no_error 28
-isr_error 29
-isr_error 30
-isr_no_error 31
-
-.macro irq number
-.global irq\number
-irq\number:
-	pushall
-	cld
-	call irq\number\()_handler
-	popall
-	iretq
-.endm
-
-irq 0
-irq 1
-irq 2
-irq 3
-irq 4
-irq 5
-irq 6
-irq 7
-irq 8
-irq 9
-irq 10
-irq 11
-irq 12
-irq 13
-irq 14
-irq 15
diff --git a/kernel/kernel.ld b/kernel/kernel.ld
deleted file mode 100644
index da5c87c..0000000
--- a/kernel/kernel.ld
+++ /dev/null
@@ -1,39 +0,0 @@
-ENTRY(_start)
-
-SECTIONS
-{
-	. = 1M;
-
-	.boot BLOCK(4K) : ALIGN(4K)
-	{
-		KEEP(*(.multiboot_header))
-	}
-
-	.text BLOCK(4K) : ALIGN(4K)
-	{
-		*(.text)
-	}
-
-	.rodata BLOCK(4K) : ALIGN(4K)
-	{
-		*(.rodata)
-	}
-
-	.data BLOCK(4K) : ALIGN(4K)
-	{
-		*(.data)
-	}
-
-	.bss BLOCK(4K) : ALIGN(4K)
-	{
-		*(COMMON)
-		*(.bss)
-	}
-
-	/DISCARD/ :
-	{
-		*(.comment.*)
-		*(.note.*)
-		*(.eh_frame)
-	}
-}
diff --git a/kernel/keyboard.c b/kernel/keyboard.c
deleted file mode 100644
index 105c3a8..0000000
--- a/kernel/keyboard.c
+++ /dev/null
@@ -1,20 +0,0 @@
-#include <stdint.h>
-#include <pic.h>
-#include <io.h>
-#include <graphics.h>
-#include <debug.h>
-
-#define KEYBOARD_DATA_PORT	0x60
-#define KEYBOARD_STATUS_PORT	0x64
-
-uint8_t i = 0;
-
-void keyboard_handler(void)
-{
-	uint8_t status = inb(KEYBOARD_STATUS_PORT);
-	if (!(status & 0x1)) {
-		return;
-	}
-	uint8_t keycode = inb(KEYBOARD_DATA_PORT);
-	fb_draw_character(fb, keycode, 0, 0, RED, BLACK);
-}
diff --git a/kernel/main.c b/kernel/main.c
deleted file mode 100644
index 96f3572..0000000
--- a/kernel/main.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#include <stdint.h>
-#include <multiboot2.h>
-#include <graphics.h>
-#include <idt.h>
-#include <debug.h>
-
-int kernel_main(mb2_tag_header* multiboot_bootinfo, uint32_t multiboot_magic)
-{
-	init_idt();
-	init_fb(multiboot_bootinfo, multiboot_magic);
-
-	fb_draw_string(fb, "Still working...", 8, 0, WHITE, BLACK);
-
-	for(;;) {
-		__asm__ volatile ("hlt;");
-	}
-	return 0;
-}
diff --git a/kernel/multiboot2.c b/kernel/multiboot2.c
deleted file mode 100644
index e228ce1..0000000
--- a/kernel/multiboot2.c
+++ /dev/null
@@ -1,41 +0,0 @@
-#include <stdint.h>
-#include <multiboot2.h>
-#include <graphics.h>
-
-fb_t fb;
-
-/* https://www.gnu.org/software/grub/manual/multiboot2/html_node/Boot-information-format.html */
-
-void init_fb(mb2_tag_header* multiboot_bootinfo, uint32_t multiboot_magic)
-{
-	if (multiboot_magic != MB2_MAGIC) {
-		// not loaded by multiboot2 bootloader
-		__asm__ volatile ("hlt;");
-	}
-
-	// we will store framebuffer information here
-	static mb2_tag_fb* tag_fb;
-
-	// skip first 8 bytes (total_size + reserved)
-	mb2_tag_header* tag_header = multiboot_bootinfo + 1;
-
-	while (tag_header->type != MB2_TAG_END) {
-		// process tag_type
-		switch(tag_header->type) {
-			case MB2_TAG_FB:
-				tag_fb = (mb2_tag_fb*)tag_header;
-				break;
-			default:
-				break;
-		}
-
-		// next mb2_tag
-		tag_header += tag_header->size / 8 + ((tag_header->size % 8) > 0);
-	}
-
-	fb.addr = tag_fb->framebuffer_addr;
-	fb.width = tag_fb->framebuffer_width;
-	fb.height = tag_fb->framebuffer_height;
-	fb.pitch = tag_fb->framebuffer_pitch;
-	fb.bpp = tag_fb->framebuffer_bpp;
-}
diff --git a/kernel/pic.c b/kernel/pic.c
deleted file mode 100644
index 801556d..0000000
--- a/kernel/pic.c
+++ /dev/null
@@ -1,24 +0,0 @@
-#include <io.h>
-#include <pic.h>
-
-void remap_pic(void)
-{
-	// save masks
-//	uint8_t a1 = inb(PIC1_DATA);
-//	uint8_t a2 = inb(PIC2_DATA);
-
-	// starts the initialization sequence (in cascade mode)
-	outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);
-	outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
-	outb(PIC1_DATA, 0x20);				// ICW2: Master PIC vector offset
-	outb(PIC2_DATA, 0x28);				// ICW2: Slave PIC vector offset
-	outb(PIC1_DATA, 4);				// ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
-	outb(PIC2_DATA, 2);				// ICW3: tell Slave PIC its cascade identity (0000 0010)
-
-	outb(PIC1_DATA, ICW4_8086);
-	outb(PIC2_DATA, ICW4_8086);
-
-	// mask interrupts
-	outb(PIC1_DATA, 0xfd);
-	outb(PIC2_DATA, 0xff);
-}
diff --git a/kernel/src/boot/boot.S b/kernel/src/boot/boot.S
new file mode 100644
index 0000000..ee35eeb
--- /dev/null
+++ b/kernel/src/boot/boot.S
@@ -0,0 +1,181 @@
+.global _start
+.extern begin_long_mode
+
+.section .text
+.code32
+
+_start:
+	cli
+	mov $stack_top, %esp
+	pushl $0
+	pushl %eax
+	pushl $0
+	pushl %ebx
+
+	call check_multiboot
+	call check_cpuid
+	call check_long_mode
+
+	call setup_page_tables
+	call enable_paging
+
+	lgdt gdt_pointer
+	ljmp $0x08, $begin_long_mode
+
+
+check_multiboot:
+	cmp $0x36d76289, %eax
+	jne no_multiboot
+
+	ret
+
+check_cpuid:
+	pushfl
+	pop %eax
+	mov %eax, %ecx
+	xor $1<<21, %eax
+	push %eax
+	popfl
+	pushfl
+	pop %eax
+	push %ecx
+	popfl
+	cmp %eax, %ecx
+	je no_cpuid
+
+	ret
+
+check_long_mode:
+	mov $0x80000000, %eax
+	cpuid
+	cmp $0x80000001, %eax
+	jb no_long_mode
+
+	mov $0x80000001, %eax
+	cpuid
+	test $1<<29, %edx
+	jz no_long_mode
+
+	ret
+
+setup_page_tables:
+	mov $page_table_lvl3, %eax
+	or $0x3, %eax
+	mov %eax, page_table_lvl4
+
+	mov $page_table_lvl2, %eax
+	or $0x3, %eax
+	mov %eax, page_table_lvl3
+
+	mov $page_table_lvl2 + 4096, %eax
+	or $0x3, %eax
+	mov %eax, page_table_lvl3+8
+
+	mov $page_table_lvl2 + 8192, %eax
+	or $0x3, %eax
+	mov %eax, page_table_lvl3+16
+
+	mov $page_table_lvl2 + 12288, %eax
+	or $0x3, %eax
+	mov %eax, page_table_lvl3+24
+
+
+	movl $0, %ecx
+1:
+	movl $0x200000, %eax
+	mul %ecx
+	or $0b10000011, %eax
+	movl $page_table_lvl2, %edx
+	leal (%edx, %ecx, 8), %edx
+	movl %eax, (%edx)
+	inc %ecx
+	cmp $512*4, %ecx
+	jne 1b
+
+	ret
+
+enable_paging:
+	// enable PAE
+	mov %cr4, %edx
+	or $1<<5 ,%edx
+	mov %edx, %cr4
+
+	// set LME (long mode enable)
+	mov $0xC0000080, %ecx
+	rdmsr
+	or $1<<8, %eax
+	wrmsr
+
+	// page_table_lvl4
+	mov $page_table_lvl4, %eax
+	mov %eax, %cr3
+
+	// enable paging (+ protected mode if not already enabled)
+	mov %cr0, %eax
+	or $1<<31 + 1<<0, %eax
+	mov %eax, %cr0
+
+	ret
+
+no_multiboot:
+	hlt
+
+no_cpuid:
+	hlt
+
+no_long_mode:
+	hlt
+
+
+.section .bss
+.align 4096
+
+// stack
+stack_bottom:
+	.skip 4096*4
+stack_top:
+
+// page tables
+page_table_lvl4:
+	.skip 4096
+page_table_lvl3:
+	.skip 4096
+// map first 4GB
+page_table_lvl2:
+	.skip 4096*4
+
+// Access bits
+.section .rodata
+.set PRESENT,		1 << 7
+.set NOT_SYS,		1 << 4
+.set EXEC,		1 << 3
+.set DC,		1 << 2
+.set RW,		1 << 1
+.set ACCESSED,		1 << 0
+
+// Flags bits
+.set GRAN_4K,		1 << 7
+.set SZ_32,		1 << 6
+.set LONG_MODE,		1 << 5
+
+gdt:
+gdt_null = . - gdt
+	.quad 0
+gdt_code = . - gdt
+	.long 0xFFFF				// Limit & Base (low, bits 0-15)
+	.byte 0					// Base (mid, bits 16-23)
+	.byte PRESENT | NOT_SYS | EXEC | RW	// Access
+	.byte GRAN_4K | LONG_MODE | 0xF		// Flags & Limit (high, bits 16-19)
+	.byte 0					// Base (high, bits 24-31)
+gdt_data = . - gdt
+	.long 0xFFFF
+	.byte 0
+	.byte PRESENT | NOT_SYS | RW
+	.byte GRAN_4K | SZ_32 | 0xF
+	.byte 0
+gdt_tss = . - gdt
+	.long 0x00000068
+	.long 0x00CF8900
+gdt_pointer:
+	.word . - gdt - 1
+	.quad gdt
diff --git a/kernel/src/boot/boot64.S b/kernel/src/boot/boot64.S
new file mode 100644
index 0000000..be87412
--- /dev/null
+++ b/kernel/src/boot/boot64.S
@@ -0,0 +1,19 @@
+.global begin_long_mode
+
+.section .text
+.code64
+
+begin_long_mode:
+	// reload segment registers
+	mov $0x10, %eax
+	mov %eax, %ss
+	mov %eax, %ds
+	mov %eax, %es
+	mov %eax, %fs
+	mov %eax, %gs
+
+	popq %rdi
+	popq %rsi
+
+	call kernel_main
+	hlt
diff --git a/kernel/src/boot/header.S b/kernel/src/boot/header.S
new file mode 100644
index 0000000..bbcb9be
--- /dev/null
+++ b/kernel/src/boot/header.S
@@ -0,0 +1,40 @@
+// multiboot tags
+.set TAG_END,		0
+.set TAG_FRAMEBUFFER,	5
+
+// multiboot flags
+.set TAG_REQUIRED,	0
+.set TAG_OPTIONAL,	1
+
+# multiboot2 header constants
+.set MAGIC,		0xe85250d6
+.set ARCH,		0
+.set HEADER_LENGTH,	(header_end - header_start)
+.set CHECKSUM,		0x100000000 - (MAGIC + ARCH + HEADER_LENGTH)
+
+.section .multiboot_header, "a"
+.align 4
+header_start:
+	# magic
+	.align 8
+	.long MAGIC
+	.long ARCH
+	.long HEADER_LENGTH
+	.long CHECKSUM
+
+	# framebuffer
+	.align 8
+	.word TAG_FRAMEBUFFER
+	.word TAG_REQUIRED
+	.long 20
+	.long 1024
+	.long 768
+	.long 32
+
+	# end tag
+	.align 8
+	.word TAG_END
+	.word TAG_REQUIRED
+	.long 8
+
+header_end:
diff --git a/kernel/src/boot/multiboot2.c b/kernel/src/boot/multiboot2.c
new file mode 100644
index 0000000..e228ce1
--- /dev/null
+++ b/kernel/src/boot/multiboot2.c
@@ -0,0 +1,41 @@
+#include <stdint.h>
+#include <multiboot2.h>
+#include <graphics.h>
+
+fb_t fb;
+
+/* https://www.gnu.org/software/grub/manual/multiboot2/html_node/Boot-information-format.html */
+
+void init_fb(mb2_tag_header* multiboot_bootinfo, uint32_t multiboot_magic)
+{
+	if (multiboot_magic != MB2_MAGIC) {
+		// not loaded by multiboot2 bootloader
+		__asm__ volatile ("hlt;");
+	}
+
+	// we will store framebuffer information here
+	static mb2_tag_fb* tag_fb;
+
+	// skip first 8 bytes (total_size + reserved)
+	mb2_tag_header* tag_header = multiboot_bootinfo + 1;
+
+	while (tag_header->type != MB2_TAG_END) {
+		// process tag_type
+		switch(tag_header->type) {
+			case MB2_TAG_FB:
+				tag_fb = (mb2_tag_fb*)tag_header;
+				break;
+			default:
+				break;
+		}
+
+		// next mb2_tag
+		tag_header += tag_header->size / 8 + ((tag_header->size % 8) > 0);
+	}
+
+	fb.addr = tag_fb->framebuffer_addr;
+	fb.width = tag_fb->framebuffer_width;
+	fb.height = tag_fb->framebuffer_height;
+	fb.pitch = tag_fb->framebuffer_pitch;
+	fb.bpp = tag_fb->framebuffer_bpp;
+}
diff --git a/kernel/src/cpu/idt.c b/kernel/src/cpu/idt.c
new file mode 100644
index 0000000..bf285b7
--- /dev/null
+++ b/kernel/src/cpu/idt.c
@@ -0,0 +1,88 @@
+#include <idt.h>
+#include <irq.h>
+#include <pic.h>
+
+__attribute__((aligned(0x10))) static idt_entry idt_table[256];
+idtp idt_pointer;
+
+void load_idt(idtp* pointer)
+{
+	__asm__ volatile ("lidt (%0); sti;" : : "r"(pointer) : );
+}
+
+void add_to_idt(uint16_t num, uint64_t offset, uint16_t selector, uint8_t type)
+{
+	idt_table[num].offset_1 = offset & 0xFFFF;
+	idt_table[num].offset_2 = (offset >> 16) & 0xFFFF;
+	idt_table[num].offset_3 = offset >> 32;
+	idt_table[num].selector = selector;
+	idt_table[num].type_attributes = type;
+	idt_table[num].ist = 0;
+	idt_table[num].zero = 0;
+}
+
+void init_idt_table(void)
+{
+	// exceptions
+	add_to_idt(0, (uint64_t)isr0, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(1, (uint64_t)isr1, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(2, (uint64_t)isr2, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(3, (uint64_t)isr3, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(4, (uint64_t)isr4, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(5, (uint64_t)isr5, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(6, (uint64_t)isr6, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(7, (uint64_t)isr7, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(8, (uint64_t)isr8, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(9, (uint64_t)isr9, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(10, (uint64_t)isr10, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(11, (uint64_t)isr11, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(12, (uint64_t)isr12, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(13, (uint64_t)isr13, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(14, (uint64_t)isr14, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(15, (uint64_t)isr15, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(16, (uint64_t)isr16, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(17, (uint64_t)isr17, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(18, (uint64_t)isr18, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(19, (uint64_t)isr19, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(20, (uint64_t)isr20, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(21, (uint64_t)isr21, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(22, (uint64_t)isr22, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(23, (uint64_t)isr23, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(24, (uint64_t)isr24, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(25, (uint64_t)isr25, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(26, (uint64_t)isr26, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(27, (uint64_t)isr27, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(28, (uint64_t)isr28, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(29, (uint64_t)isr29, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(30, (uint64_t)isr30, GDT_CODE_SEG, TRAP_GATE);
+	add_to_idt(31, (uint64_t)isr31, GDT_CODE_SEG, TRAP_GATE);
+
+	// interrupts
+	add_to_idt(32, (uint64_t)irq0, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(33, (uint64_t)irq1, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(34, (uint64_t)irq2, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(35, (uint64_t)irq3, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(36, (uint64_t)irq4, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(37, (uint64_t)irq5, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(38, (uint64_t)irq6, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(39, (uint64_t)irq7, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(40, (uint64_t)irq8, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(41, (uint64_t)irq9, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(42, (uint64_t)irq10, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(43, (uint64_t)irq11, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(44, (uint64_t)irq12, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(45, (uint64_t)irq13, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(46, (uint64_t)irq14, GDT_CODE_SEG, INTERRUPT_GATE);
+	add_to_idt(47, (uint64_t)irq15, GDT_CODE_SEG, INTERRUPT_GATE);
+}
+
+void init_idt()
+{
+	init_idt_table();
+	idt_pointer.size = sizeof(idt_entry) * 256 - 1;
+	idt_pointer.offset = (uint64_t)&idt_table;
+
+	remap_pic();
+
+	load_idt(&idt_pointer);
+}
diff --git a/kernel/src/cpu/io.c b/kernel/src/cpu/io.c
new file mode 100644
index 0000000..6bf67d0
--- /dev/null
+++ b/kernel/src/cpu/io.c
@@ -0,0 +1,13 @@
+#include <stdint.h>
+
+uint8_t inb(uint32_t port)
+{
+	uint8_t ret;
+	__asm__ volatile ("inb %%dx, %%al" : "=a"(ret) : "d"(port));
+	return ret;
+}
+
+void outb(uint32_t port, uint8_t value)
+{
+	__asm__ volatile ("outb %%al, %%dx" : : "d"(port), "a"(value));
+}
diff --git a/kernel/src/cpu/irq.c b/kernel/src/cpu/irq.c
new file mode 100644
index 0000000..1e02f23
--- /dev/null
+++ b/kernel/src/cpu/irq.c
@@ -0,0 +1,289 @@
+#include <stdint.h>
+#include <pic.h>
+#include <io.h>
+#include <keyboard.h>
+#include <graphics.h>
+
+char* exception_name[] = {
+	"Divide-by-zero Error",
+	"Debug",
+	"Non-maskable Interrupt",
+	"Breakpoint",
+	"Overflow",
+	"Bound Range Exceeded",
+	"Invalid Opcode",
+	"Device Not Available",
+	"Double Fault",
+	"Coprocessor Segment Overrun",
+	"Invalid TSS",
+	"Segment Not Present",
+	"Stack-Segment Fault",
+	"General Protection Fault",
+	"Page Fault",
+	"Reserved",
+	"x87 Floating-Point Exception",
+	"Alignment Check",
+	"Machine Check",
+	"SIMD Floating-Point Exception",
+	"Virtualization Exception",
+	"Control Protection Exception",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Reserved",
+	"Hypervisor Injection Exception",
+	"VMM Communication Exception",
+	"Security Exception",
+	"Reserved",
+};
+
+void isr0_handler(void)
+{
+	fb_draw_string(fb, exception_name[0], 0, 0, WHITE, BLACK);
+}
+
+void isr1_handler(void)
+{
+	fb_draw_string(fb, exception_name[1], 0, 0, WHITE, BLACK);
+}
+
+void isr2_handler(void)
+{
+	fb_draw_string(fb, exception_name[2], 0, 0, WHITE, BLACK);
+}
+
+void isr3_handler(void)
+{
+	fb_draw_string(fb, exception_name[3], 0, 0, WHITE, BLACK);
+}
+
+void isr4_handler(void)
+{
+	fb_draw_string(fb, exception_name[4], 0, 0, WHITE, BLACK);
+}
+
+void isr5_handler(void)
+{
+	fb_draw_string(fb, exception_name[5], 0, 0, WHITE, BLACK);
+}
+
+void isr6_handler(void)
+{
+	fb_draw_string(fb, exception_name[6], 0, 0, WHITE, BLACK);
+}
+
+void isr7_handler(void)
+{
+	fb_draw_string(fb, exception_name[7], 0, 0, WHITE, BLACK);
+}
+
+void isr8_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[8], 0, 0, WHITE, BLACK);
+}
+
+void isr9_handler(void)
+{
+	fb_draw_string(fb, exception_name[9], 0, 0, WHITE, BLACK);
+}
+
+void isr10_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[10], 0, 0, WHITE, BLACK);
+}
+
+void isr11_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[11], 0, 0, WHITE, BLACK);
+}
+
+void isr12_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[12], 0, 0, WHITE, BLACK);
+}
+
+void isr13_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[13], 0, 0, WHITE, BLACK);
+}
+
+void isr14_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[14], 0, 0, WHITE, BLACK);
+}
+
+void isr15_handler(void)
+{
+	fb_draw_string(fb, exception_name[15], 0, 0, WHITE, BLACK);
+}
+
+void isr16_handler(void)
+{
+	fb_draw_string(fb, exception_name[16], 0, 0, WHITE, BLACK);
+}
+
+void isr17_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[17], 0, 0, WHITE, BLACK);
+}
+
+void isr18_handler(void)
+{
+	fb_draw_string(fb, exception_name[18], 0, 0, WHITE, BLACK);
+}
+
+void isr19_handler(void)
+{
+	fb_draw_string(fb, exception_name[19], 0, 0, WHITE, BLACK);
+}
+
+void isr20_handler(void)
+{
+	fb_draw_string(fb, exception_name[20], 0, 0, WHITE, BLACK);
+}
+
+void isr21_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[21], 0, 0, WHITE, BLACK);
+}
+
+void isr22_handler(void)
+{
+	fb_draw_string(fb, exception_name[22], 0, 0, WHITE, BLACK);
+}
+
+void isr23_handler(void)
+{
+	fb_draw_string(fb, exception_name[23], 0, 0, WHITE, BLACK);
+}
+
+void isr24_handler(void)
+{
+	fb_draw_string(fb, exception_name[24], 0, 0, WHITE, BLACK);
+}
+
+void isr25_handler(void)
+{
+	fb_draw_string(fb, exception_name[25], 0, 0, WHITE, BLACK);
+}
+
+void isr26_handler(void)
+{
+	fb_draw_string(fb, exception_name[26], 0, 0, WHITE, BLACK);
+}
+
+void isr27_handler(void)
+{
+	fb_draw_string(fb, exception_name[27], 0, 0, WHITE, BLACK);
+}
+
+void isr28_handler(void)
+{
+	fb_draw_string(fb, exception_name[28], 0, 0, WHITE, BLACK);
+}
+
+void isr29_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[29], 0, 0, WHITE, BLACK);
+}
+
+void isr30_handler(uint64_t error)
+{
+	fb_draw_string(fb, exception_name[30], 0, 0, WHITE, BLACK);
+}
+
+void isr31_handler(void)
+{
+	fb_draw_string(fb, exception_name[31], 0, 0, WHITE, BLACK);
+}
+
+void irq0_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq1_handler(void)
+{
+	keyboard_handler();
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq2_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq3_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq4_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq5_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq6_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq7_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void irq8_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
+
+void irq9_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
+
+void irq10_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
+
+void irq11_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
+
+void irq12_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
+
+void irq13_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
+
+void irq14_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
+
+void irq15_handler(void)
+{
+	outb(PIC1_COMMAND, PIC_EOI);
+	outb(PIC2_COMMAND, PIC_EOI);
+}
diff --git a/kernel/src/cpu/irq_stub.S b/kernel/src/cpu/irq_stub.S
new file mode 100644
index 0000000..ddd197a
--- /dev/null
+++ b/kernel/src/cpu/irq_stub.S
@@ -0,0 +1,108 @@
+.macro pushall
+	push %rax
+	push %rcx
+	push %rdx
+	push %rsi
+	push %rdi
+	push %r8
+	push %r9
+	push %r10
+	push %r11
+	pushfq
+.endm
+
+.macro popall
+	popfq
+	pop %r11
+	pop %r10
+	pop %r9
+	pop %r8
+	pop %rdi
+	pop %rsi
+	pop %rdx
+	pop %rcx
+	pop %rax
+.endm
+
+
+.macro isr_no_error number
+.global isr\number
+isr\number:
+	pushall
+	cld
+	call isr\number\()_handler
+	popall
+	iretq
+.endm
+
+.macro isr_error number
+.global isr\number
+isr\number:
+	# rdi not saved
+	pop %rdi
+	pushall
+	cld
+	call isr\number\()_handler
+	popall
+	iretq
+.endm
+
+isr_no_error 0
+isr_no_error 1
+isr_no_error 2
+isr_no_error 3
+isr_no_error 4
+isr_no_error 5
+isr_no_error 6
+isr_no_error 7
+isr_error 8
+isr_no_error 9
+isr_error 10
+isr_error 11
+isr_error 12
+isr_error 13
+isr_error 14
+isr_no_error 15
+isr_no_error 16
+isr_error 17
+isr_no_error 18
+isr_no_error 19
+isr_no_error 20
+isr_no_error 21
+isr_no_error 22
+isr_no_error 23
+isr_no_error 24
+isr_no_error 25
+isr_no_error 26
+isr_no_error 27
+isr_no_error 28
+isr_error 29
+isr_error 30
+isr_no_error 31
+
+.macro irq number
+.global irq\number
+irq\number:
+	pushall
+	cld
+	call irq\number\()_handler
+	popall
+	iretq
+.endm
+
+irq 0
+irq 1
+irq 2
+irq 3
+irq 4
+irq 5
+irq 6
+irq 7
+irq 8
+irq 9
+irq 10
+irq 11
+irq 12
+irq 13
+irq 14
+irq 15
diff --git a/kernel/src/cpu/pic.c b/kernel/src/cpu/pic.c
new file mode 100644
index 0000000..801556d
--- /dev/null
+++ b/kernel/src/cpu/pic.c
@@ -0,0 +1,24 @@
+#include <io.h>
+#include <pic.h>
+
+void remap_pic(void)
+{
+	// save masks
+//	uint8_t a1 = inb(PIC1_DATA);
+//	uint8_t a2 = inb(PIC2_DATA);
+
+	// starts the initialization sequence (in cascade mode)
+	outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);
+	outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
+	outb(PIC1_DATA, 0x20);				// ICW2: Master PIC vector offset
+	outb(PIC2_DATA, 0x28);				// ICW2: Slave PIC vector offset
+	outb(PIC1_DATA, 4);				// ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
+	outb(PIC2_DATA, 2);				// ICW3: tell Slave PIC its cascade identity (0000 0010)
+
+	outb(PIC1_DATA, ICW4_8086);
+	outb(PIC2_DATA, ICW4_8086);
+
+	// mask interrupts
+	outb(PIC1_DATA, 0xfd);
+	outb(PIC2_DATA, 0xff);
+}
diff --git a/kernel/src/devices/keyboard.c b/kernel/src/devices/keyboard.c
new file mode 100644
index 0000000..105c3a8
--- /dev/null
+++ b/kernel/src/devices/keyboard.c
@@ -0,0 +1,20 @@
+#include <stdint.h>
+#include <pic.h>
+#include <io.h>
+#include <graphics.h>
+#include <debug.h>
+
+#define KEYBOARD_DATA_PORT	0x60
+#define KEYBOARD_STATUS_PORT	0x64
+
+uint8_t i = 0;
+
+void keyboard_handler(void)
+{
+	uint8_t status = inb(KEYBOARD_STATUS_PORT);
+	if (!(status & 0x1)) {
+		return;
+	}
+	uint8_t keycode = inb(KEYBOARD_DATA_PORT);
+	fb_draw_character(fb, keycode, 0, 0, RED, BLACK);
+}
diff --git a/kernel/src/grub.cfg b/kernel/src/grub.cfg
new file mode 100644
index 0000000..05a13f7
--- /dev/null
+++ b/kernel/src/grub.cfg
@@ -0,0 +1,8 @@
+set timeout=0
+set default=0
+
+insmod efi_gop
+menuentry "mykernel64" {
+	multiboot2 /boot/kernel.bin
+	boot
+}
diff --git a/kernel/src/kernel.ld b/kernel/src/kernel.ld
new file mode 100644
index 0000000..da5c87c
--- /dev/null
+++ b/kernel/src/kernel.ld
@@ -0,0 +1,39 @@
+ENTRY(_start)
+
+SECTIONS
+{
+	. = 1M;
+
+	.boot BLOCK(4K) : ALIGN(4K)
+	{
+		KEEP(*(.multiboot_header))
+	}
+
+	.text BLOCK(4K) : ALIGN(4K)
+	{
+		*(.text)
+	}
+
+	.rodata BLOCK(4K) : ALIGN(4K)
+	{
+		*(.rodata)
+	}
+
+	.data BLOCK(4K) : ALIGN(4K)
+	{
+		*(.data)
+	}
+
+	.bss BLOCK(4K) : ALIGN(4K)
+	{
+		*(COMMON)
+		*(.bss)
+	}
+
+	/DISCARD/ :
+	{
+		*(.comment.*)
+		*(.note.*)
+		*(.eh_frame)
+	}
+}
diff --git a/kernel/src/main.c b/kernel/src/main.c
new file mode 100644
index 0000000..96f3572
--- /dev/null
+++ b/kernel/src/main.c
@@ -0,0 +1,18 @@
+#include <stdint.h>
+#include <multiboot2.h>
+#include <graphics.h>
+#include <idt.h>
+#include <debug.h>
+
+int kernel_main(mb2_tag_header* multiboot_bootinfo, uint32_t multiboot_magic)
+{
+	init_idt();
+	init_fb(multiboot_bootinfo, multiboot_magic);
+
+	fb_draw_string(fb, "Still working...", 8, 0, WHITE, BLACK);
+
+	for(;;) {
+		__asm__ volatile ("hlt;");
+	}
+	return 0;
+}
diff --git a/kernel/src/misc/debug.c b/kernel/src/misc/debug.c
new file mode 100644
index 0000000..5f3c327
--- /dev/null
+++ b/kernel/src/misc/debug.c
@@ -0,0 +1,6 @@
+#include <stdint.h>
+
+void bochs_breakpoint(void)
+{
+	__asm__ volatile ("xchgw %bx, %bx;");
+}
diff --git a/kernel/src/misc/graphics.c b/kernel/src/misc/graphics.c
new file mode 100644
index 0000000..d4fc7c7
--- /dev/null
+++ b/kernel/src/misc/graphics.c
@@ -0,0 +1,119 @@
+#include <stdint.h>
+#include <multiboot2.h>
+#include <graphics.h>
+#include <font.h>
+
+uint64_t* pixel_offset(fb_t fb, uint32_t x, uint32_t y)
+{
+	return (uint64_t*)((char*)fb.addr + y * fb.pitch + x * fb.bpp / 8);
+}
+
+void fb_draw_pixel(fb_t fb, uint32_t x, uint32_t y, uint32_t col)
+{
+	if (x >= fb.width || y >= fb.height) return;
+
+	uint32_t* fb_offset = (uint32_t*)pixel_offset(fb, x, y);
+	*fb_offset = col;
+}
+
+/* https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm */
+
+void fb_draw_line_low(fb_t fb, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t col)
+{
+	int32_t dx = x1 - x0;
+	int32_t dy = y1 - y0;
+	int32_t yi = 1;
+	if (dy < 0) {
+		yi = -1;
+		dy = -dy;
+	}
+	int32_t D = (2 * dy) - dx;
+	int32_t y = y0;
+
+	for (int32_t x = x0; x <= x1; x++) {
+		fb_draw_pixel(fb, x, y, col);
+		if (D > 0) {
+			y = y + yi;
+			D = D + (2 * (dy - dx));
+		} else {
+			D = D + 2 * dy;
+		}
+	}
+
+}
+
+void fb_draw_line_high(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col)
+{
+	int32_t dx = x1 - x0;
+	int32_t dy = y1 - y0;
+	int32_t xi = 1;
+	if (dx < 0) {
+		xi = -1;
+		dx = -dx;
+	}
+	int32_t D = (2 * dx) - dy;
+	int32_t x = x0;
+
+	for (int32_t y = y0; y <= y1; y++) {
+		fb_draw_pixel(fb, x, y, col);
+		if (D > 0) {
+			x = x + xi;
+			D = D + (2 * (dx - dy));
+		} else {
+			D = D + 2 * dx;
+		}
+	}
+}
+
+int32_t abs(int32_t val)
+{
+	if (val < 0) return -val;
+	return val;
+}
+
+void fb_draw_line(fb_t fb, int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t col)
+{
+	if (abs(y1 - y0) < abs(x1 - x0)) {
+		if (x0 > x1)
+			fb_draw_line_low(fb, x1, y1, x0, y0, col);
+		else
+			fb_draw_line_low(fb, x0, y0, x1, y1, col);
+	} else {
+		if (y0 > y1)
+			fb_draw_line_high(fb, x1, y1, x0, y0, col);
+		else
+			fb_draw_line_high(fb, x0, y0, x1, y1, col);
+	}
+}
+
+void fb_draw_character(fb_t fb, char c, uint32_t x, uint32_t y, uint32_t char_col, uint32_t bg_col)
+{
+	if (c < 0) return;
+
+	uint32_t offset = 32 + c * 16;
+	for (uint32_t i = 0 ; i < 16; i++)
+	{
+		for (uint32_t j = 0 ; j < 8; j++)
+		{
+			if (font[offset + i] & (1 << (7 - j))) {
+				fb_draw_pixel(fb, x + j, y + i, char_col);
+			} else {
+				fb_draw_pixel(fb, x + j, y + i, bg_col);
+			}
+		}
+	}
+}
+
+uint32_t strlen(const char* s)
+{
+	char *p = (char*)s;
+	while (*p) p++;
+	return p - s;
+}
+
+void fb_draw_string(fb_t fb, const char* s, uint32_t x, uint32_t y, uint32_t char_col, uint32_t bg_col)
+{
+	for (uint32_t i = 0; i < strlen(s); i++) {
+		fb_draw_character(fb, s[i], x + i * 8, y, char_col, bg_col);
+	}
+}
-- 
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