feat(kernel): setup recursive page dir

boot/loader/loader.asm

@@ -237,6 +237,8 @@ common32:
 	mov edi, KERNEL_BASE
 	rep movsb
 
+	;; XXX: refactor this code
+
 	; identity map first 1MB
 	xor esi, esi
 	xor ecx, ecx

boot/loader/mmu.inc

@@ -1,7 +0,0 @@
-PE_PRESENT  = (1 shl 0)
-PE_WRITABLE = (1 shl 1)
-PE_USERMODE = (1 shl 2)
-PE_ACCESSED = (1 shl 5)
-PE_DIRTY    = (1 shl 6)
-
-	

kernel/kernel.asm

@@ -44,6 +44,10 @@ kmain:
 	mov esi, szMsgBuildDate
 	call klog
 
+	call mm_bootstrap
+
+	xchg bx, bx
+
 	; init pmm (kend, 0x400000)
 	mov eax, kend
 	mov ebx, 0xC0400000
@@ -117,6 +121,7 @@ kmain:
 	include 'klog.inc'
 	include 'dev/console.inc'
 	include 'dev/dev.inc'
+	include 'mm/bootstrap.inc'
 	include 'mm/mm.old.inc'
 	include 'lock.inc'
 	include 'gdt.inc'

kernel/mm/bootstrap.inc

@@ -2,6 +2,44 @@
 	;; Bootstrap whole PMM and MM
 
 	;; Function: mm_bootstrap
-	;; Setup recursive page dir at 0xFFFFF000 and temporary identity map first 3GB
+	;; Setup recursive paging.
+	;; map page dir at 0xFFFFF000
 mm_bootstrap:
+	mov esi, szMsgMmBootstrap
+	call klog
+	; 0x400000
+	; PDE entry: 0x7ffc00 phys addr 0xC0 and curr virt addr: 0xc07ffc00
+
+	; map first 4MB at KERNEL_VIRT_BASE
+	xor esi, esi
+	mov edi, KERNEL_VIRT_BASE + 0x400000 + (768 * PAGE_SIZE)
+	xor ecx, ecx
+@@:
+	mov edx, esi
+	or edx, (PTE_P or PTE_W)
+	mov [edi], edx
+	add edi, 4
+	add esi, PAGE_SIZE
+	inc ecx
+	cmp ecx, 1024
+	jb @b
+
+	; recusive page dir
+	mov edi, KERNEL_VIRT_BASE + 0x400000 + (1023 * PAGE_SIZE)
+	xor ecx, ecx
+@@:
+	mov edx, esi
+	or edx, (PTE_P or PTE_W)
+	mov [edi], edx
+	add edi, 4
+	add esi, PAGE_SIZE
+	inc ecx
+	cmp ecx, 1024
+	jb @b
+
+	mov eax, 0x400000 + (1023 * PAGE_SIZE)
+	mov cr3, eax
+
 	ret
+
+szMsgMmBootstrap db "MM: boostrap", 0