MAJOR REWRITE

- Kernel got pretty much deleted, will be rewriting in following days
- Bootloader got rewritten, stage1 works, stage2 will be written in following days
- Libc is still the same
- User will contains userspace stuff
- Rewrote makefiles again
- Got rid of backup (see previous commits for that)
- Image has 1 MBR partition for FAT32 which contains 'kern.bin' file
- Remade info files to be more "big project" style (all caps plain text)
- Added some dumb docs

kernel/src/entry.s

@@ -0,0 +1,108 @@
+;
+; Kernel entry point
+;
+
+MBH_MAGIC	equ 0xe85250d6
+MBH_ARCH	equ 0x00000000
+STACK_SIZE	equ 4096
+global VIRT_BASE
+KERN_VIRT_BASE	equ 0xC000000
+KERN_PAGE_NUM	equ (KERN_VIRT_BASE >> 22)
+
+bits 32
+
+; Multiboot2 Header
+section .multiboot
+align 64
+mbh:
+; Magic fields
+.magic: 	dd MBH_MAGIC
+.arch:		dd MBH_ARCH
+.size:		dd (mbh.end - mbh)
+.checksum:	dd 0x10000000 - (MBH_MAGIC + MBH_ARCH + (mbh.end - mbh))
+
+; Framebuffer Tag
+align 8
+dw 5	; Type - Framebuffer
+dw 1	; Flags	- Optional
+dd 20	; Size
+dd 1920	; Width
+dd 1080	; Height
+dd 32	; Depth
+
+; Zero Tag
+align 8
+dw 0	; Type - Zero
+dw 0	; Flags
+dd 8	; Size	
+
+.end:
+
+; Stack
+section .bss
+align 16
+stack_bottom:
+	resb 16384*8
+stack_top:
+
+; Entry section
+section .boot
+global start
+
+extern kmain
+start:
+	; Init temporary paging
+	mov eax, (initpd - 0xC0000000)
+	mov cr3, eax
+
+	mov ecx, cr4
+	or ecx, 0x10	; Paging enable bit
+	mov cr4, ecx
+
+	mov ecx, cr0
+	or ecx, 0x8000000
+	mov cr0, ecx
+
+	jmp higher_half
+
+Shutdown:
+	mov ax, 0x1000
+	mov ss, ax
+	mov sp, 0xf000
+	mov ax, 0x5307
+	mov bx, 0x0001
+	mov cx, 0x0003
+	int 0x15
+
+section .text
+higher_half:
+	mov esp, stack_top	; Stack Pointer
+
+	add ebx, KERN_VIRT_BASE ; Make address in EBX virtual
+	push ebx		; Push multiboot mem info pointer
+
+	call kmain
+
+; Halt on return
+cli
+h: 	hlt
+	jmp h
+
+section .data
+
+; Inital Page Directory
+align 4096
+global initpd
+initpd:
+	dd 0b10000011		; Initial 4MB identity map
+
+	times 768-1 dd 0	; Padding
+
+	; Higher half kernel start, map 16MB
+	dd (0 << 22) | 0b10000011
+	dd (1 << 22) | 0b10000011
+	dd (2 << 22) | 0b10000011
+	dd (3 << 22) | 0b10000011
+
+	times 256-4 dd 0	; More padding
+

kernel/src/kernel.c

@@ -0,0 +1,4 @@
+#include <stdint.h>
+
+void kmain(uint32_t addr) {}
+