feat(loader, kernel): impl part of loader and initialize kernel structure

arch/x86_64/boot/header.S

@@ -0,0 +1,69 @@
+#include "multiboot2.h"
+#include "kcapsule.h" // Auto-generated file
+#include "boot.h"
+    .set falign, 0x200
+    .code16
+    .section ".header", "a"
+    .global _start
+_start: // Just make linker happy
+yuki_header:
+    .ascii "YUKIOS"
+    .quad 0x131084C
+
+    .org 0x50
+    .balign 8
+multiboot2_header:
+    .long MULTIBOOT2_HEADER_MAGIC
+    .long MULTIBOOT_ARCHITECTURE_I386
+    .long multiboot2_header_end - multiboot2_header
+    .long -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT_ARCHITECTURE_I386 + (multiboot2_header_end - multiboot2_header))
+    .balign 8
+address_tag:
+    .short MULTIBOOT_HEADER_TAG_ADDRESS
+    .short 0
+    .long address_tag_end - address_tag
+    .long LOAD_PHYSICAL_ADDR + multiboot2_header
+    .long -1
+    .long 0
+    .long 0
+address_tag_end:
+    .balign 8
+entry_tag:
+    .short MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS
+    .short MULTIBOOT_HEADER_TAG_OPTIONAL
+    .long entry_tag_end - entry_tag
+    .long LOAD_PHYSICAL_ADDR + header_size + CAP_startup_32
+entry_tag_end:
+// entry_efi_i386_tag:
+//     .short MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI32
+//     .short MULTIBOOT_HEADER_TAG_OPTIONAL
+//     .long entry_efi_i386_tag_end - entry_efi_i386_tag
+//     .long header_size + CAP_startup_32
+// entry_efi_i386_tag_end:
+// entry_efi_amd64_tag:
+//     .short MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64
+//     .short MULTIBOOT_HEADER_TAG_OPTIONAL
+//     .long entry_efi_amd64_tag_end - entry_efi_amd64_tag
+//     .long header_size + CAP_startup_64
+// entry_efi_amd64_tag_end:
+    .balign 8
+framebuffer_tag:
+    .short MULTIBOOT_HEADER_TAG_FRAMEBUFFER
+    .short MULTIBOOT_HEADER_TAG_OPTIONAL
+    .long framebuffer_tag_end - framebuffer_tag
+    .long 0
+    .long 0
+    .long 0
+framebuffer_tag_end:
+//     .balign 8
+// relocatable_tag:
+//     .short MULTIBOOT_HEADER_TAG_RELOCATABLE
+//     .short MULTIBOOT_HEADER_TAG_OPTIONAL
+//     .long relocatable_tag_end - relocatable_tag
+//     .long 0x0               /* min_addr */
+//     .long 0xf0000000        /* max_addr */
+//     .long falign            /* align */
+//     .long 0x0
+// relocatable_tag_end:
+multiboot2_header_end:
+    .balign falign