refactor: replace magic values with consts

boot/loader/loader.asm

@@ -148,6 +148,7 @@ _start:
 	include 'gdt.inc'
 	include '../common/bootinfo.inc'
 	include '../../kernel/sys/register.inc'
+	include '../../kernel/sys/mmu.inc'
 
 uDrive    rb 1
 bDriveLBA db FALSE
@@ -192,7 +193,7 @@ common32:
 	mov edi, boot_0_page_table
 @@:
 	mov edx, esi
-	or edx, 0x3
+	or edx, (PTE_P or PTE_W)
 	mov [edi], edx
 	add edi, 4
 	add esi, 4096
@@ -200,15 +201,15 @@ common32:
 	cmp ecx, 1024
 	jb @b
 	
-	mov dword [boot_page_directory], boot_0_page_table + 0x3 ; preset and writable
+	mov dword [boot_page_directory], boot_0_page_table + (PDE_P or PDE_W) ; preset and writable
 
-	mov dword [boot_page_directory + (768 * 4)], boot_0_page_table + 0x3
+	mov dword [boot_page_directory + (768 * 4)], boot_0_page_table + (PDE_P or PDE_W)
 
 	mov eax, boot_page_directory
 	mov cr3, eax
 
 	mov eax, cr0
-	or eax, CR0_PG or CR0_WP
+	or eax, (CR0_PG or CR0_WP)
 	mov cr0, eax
 
 	mov eax, STPDBOOT_MAGIC

kernel/intro.txt

@@ -1,32 +1 @@
 File: Introduction
-
-About: kernel memory map
-
-Kernel Source Overview:
-
-> kernel
-> ├── dev
-> ├── fs
-> └── mm
-
-
->
-> Physical map                            virtual map
->            +---------------+
->            |               |
->            +---------------+
->            | ISA hole ?    |
-> 0x00F00000 +---------------+
->            | RAM           | 
->            +---------------+   
->            |  kernel       |
-> 0x00100000 +---------------+       
->            | ROM           |       
-> 0x000BFFFF +---------------+      
->            | video display |       
->            |    memory     |       
-> 0x0009FFFF +---------------+    
->            |     RAM       |
->            |               |
-> 0x00000000 +---------------+ 
->

kernel/mm/mm.inc

@@ -1,12 +1,50 @@
 	;; File: mm.inc
 	;; StupidOS Memory Manager
+	;;
+	;; About: Memory Layout
+	;;
+	;; >                 Virtual
+	;; > 0xFFFFFFFF +---------------+
+	;; >            |               |
+	;; >            | Device Memory |
+	;; >            |               |
+	;; >            +---------------+
+	;; >            |               |
+	;; >            | Kernel Heap   |
+	;; >            |               |
+	;; >   KERN_END +---------------+
+	;; >            |               |
+	;; >            | Stupid Kernel |
+	;; >            |               |
+	;; > 0xC0100000 +---------------+
+	;; >            | I/O Space and |
+	;; >            | phys memory   |
+	;; >            | Lower than 1M | kernel mode only
+	;; > 0xC0000000 +---------------+
+	;; >            |               | user mode
+	;; >            |  userspace    |
+	;; >            |               |
+	;; > 0x00000000 +---------------+
+	;;
 
 include "pmm.inc"
+include "../sys/mmu.inc"
 
+	;; Macro: KV2P
+	;; Convert virtual address to physical
 macro KV2P reg {
 	sub reg, KERNEL_VIRT_BASE
 }
 
+	;; Macro: KP2V
+macro KP2V reg {
+	add reg, KERNEL_VIRT_BASE
+}
+
+mm_kmap:
+	ret
+
+	;; Function: mm_init
 mm_init:
 	mov esi, szMsgMmInit
 	call klog
@@ -27,7 +65,7 @@ mm_init:
 	mov edi, eax
 @@:
 	mov edx, esi
-	or edx, 0x3
+	or edx, (PTE_P or PTE_W)
 	mov [edi], edx
 	add edi, 4
 	add esi, 4096
@@ -35,7 +73,7 @@ mm_init:
 	cmp ecx, 1024
 	jb @b
 
-	or eax, 0x03
+	or eax, (PDE_P or PDE_W)
 	mov edx, [pKernelPgDir]
 	add edx, (768 * 4)
 	KV2P eax

kernel/sys/mmu.inc

@@ -39,15 +39,15 @@
 	;; PDE_U   - User
 	;; PDE_PWT - Write-Through
 	;; PDE_PS  - 4MiB page
-PDE_P   equ 1 << 0
-PDE_W   equ 1 << 1
-PDE_U   equ 1 << 2
-PDE_PWT equ 1 << 3
-PDE_PCD equ 1 << 4
-PDE_A   equ 1 << 5
-PDE_D   equ 1 << 6
-PDE_PS  equ 1 << 7
-PDE_G   equ 1 << 8
+PDE_P   = 0x001
+PDE_W   = 0x002
+PDE_U   = 0x004
+PDE_PWT = 0x008
+PDE_PCD = 0x010
+PDE_A   = 0x020
+PDE_D   = 0x040
+PDE_PS  = 0x080
+PDE_G   = 0x100
 
 	;; Defines: Page Table Flags
 	;; PTE_P   - Present
@@ -59,12 +59,12 @@ PDE_G   equ 1 << 8
 	;; PTE_D   - Dirty
 	;; PTE_PAT - TODO
 	;; PTE_G   - TODO
-PTE_P   equ 1 << 0
-PTE_W   equ 1 << 1
-PTE_U   equ 1 << 2
-PTE_PWT equ 1 << 3
-PTE_PCD equ 1 << 4
-PTE_A   equ 1 << 5
-PTE_D   equ 1 << 6
-PTE_PAT equ 1 << 7
-PTE_G   equ 1 << 8
+PTE_P   = 0x001
+PTE_W   = 0x002
+PTE_U   = 0x004
+PTE_PWT = 0x008
+PTE_PCD = 0x010
+PTE_A   = 0x020
+PTE_D   = 0x040
+PTE_PAT = 0x080
+PTE_G   = 0x100