%include "inc.asm"%include "mem.asm" [section .multiboot][global mboot]mboot:	dd	0x1BADB002			;; magic	dd	0x00000003			;; flags	dd	-(0x1BADB002 + 0x00000003)	;; checksum	dd	0				;; header_addr	dd	0				;; load_addr	dd	0				;; load_end_addr	dd	0				;; bss_end_addr	dd	0				;; entry_addr	dd	0				;; mode_type	dd	0				;; width	dd	0				;; height	dd	0				;; depth [section .inittext][global start][BITS 32]start:	; interrupts off	cli 	; save multiboot pointer	mov	[multibootsig - KZERO], eax	or	ebx, 0x80000000	mov	[multibootptr - KZERO], ebx 	mov	eax, cr4	or	eax, 0x80|0x20|0x10		; PGE, PAE, PSE	mov	cr4, eax 	mov	eax, initpml4 - KZERO	mov	cr3, eax 	mov	ecx, 0xC0000080	rdmsr	or	eax, (1 << 11)|(1 << 8)|(1 << 0); NXE, LME, SCE	wrmsr 	mov	eax, cr0	or	eax, 0x80010000			; PG & WP	mov	cr0, eax	lgdt	[gdtptr64p - KZERO]	jmp	0x08:_identity [BITS 64]_identity:	mov	rax, _start64v	jmp	rax [section .text][extern main]_start64v:	lgdt	[DWORD gdtptr64v - KZERO]	mov	ax, 0x10	mov	ds, ax	mov	ss, ax	mov	es, ax	mov	fs, ax	mov	gs, ax 	mov	rax, 0	push	rax	popfq 	call	maindied:	cli	hlt	jmp	died [section .padata]initpml4:	; Covers 256 TiB (Full 48-bit Virtual Address Space)	dd	initpdp - KZERO + 3, 0	; Identity Map Low 4Mb	times 0xA0*2-1	dq	0	; Stacks at 0xFFFFA...	dd	stackpdp - KZERO + 3, 0	times 512-4-($-initpml4)/8	dq	0	; < dq until hit 512-4	dd	initpml4 - KZERO + 3, 0	dq	0	dq	0	dd	highpdp - KZERO + 3, 0	; Map Low 4Mb to kernel base initpdp:	; Covers 512 GiB	dd	initpd - KZERO + 3, 0	times 511	dq	0 stackpdp:	dd	stackpd - KZERO + 3, 0	times 511	dq	0 highpdp:	; Covers 512 GiB	times 510	dq	0	dd	initpd - KZERO + 3, 0	dq	0 initpd:		; Covers 1 GiB	dd	0x000000 + 0x183,0	; Global, 2MiB	dd	0x200000 + 0x183,0	; Global, 2MiB	times 510	dq	0 stackpd:	dd	kstackpt - KZERO + 3, 0	times 511	dq	0 kstackpt:	; Covers 2 MiB	; Initial stack - 64KiB	dq	0	%assign i 0	%rep KSTACK-1	dd	initkstack - KZERO + i*0x1000 + 0x103, 0	%assign i i+1	%endrep	times 512-KSTACK	dq 0 initkstack:	times 0x1000*(KSTACK-1)	db 0	; 8 Pages [section .rodata] ;; multiboot structure pointer (physical address)[section .data][global multibootptr]multibootptr:	dd	0, 0xFFFFFFFF [global multibootsig]multibootsig:	dd	0 EXPORT gdt	dd	0, 0	; (KESEG) 64 bit long mode exec segment	dd	0x00000000, 0x00209A00	; 0x08: 64-bit Code	dd	0x00000000, 0x00009200	; 0x10: 64-bit Data	; 32 bit data segment descriptor for 4 gigabytes (PL 0)	dd	0x00000000, 0x0040FA00	; 0x18: 32-bit User Code	; 32 bit exec segment descriptor for 4 gigabytes (PL 0)	dd	0x00000000, 0x0040F200	; 0x20: User Data gdtptr64p:	dw	$-gdt-1	dd	gdt - KZERO	dd	0gdtptr64v:	dw	gdtptr64p-gdt-1	dq	gdt ;; EXPORT task_switch;; 	SAVE rbp, rbx, r12, r13, r14, r15;; 	mov [rdi], rsp;; 	mov rsp, [rsi]	; New RSP;; 	mov cr3, rcx	; New CR3;; 	; New FSBASE;; 	mov rax, rdx;; 	shr rdx, 32	; EDX = High;; 	mov ecx, 0xC0000100	; FS Base;; 	wrmsr;; 	RESTORE rbp, rbx, r12, r13, r14, r15;; 	ret;; EXPORT thread_trampoline;; 	pop rax	; 1. Pop thread root method off stack;; 	mov rdi, rsp	; 2. Set RDI to the object to call;; 	jmp rax	; 3. Jump to the thread root method, which should never return ; vim: ft=nasm