Improved kernel memory usage

Moved base linear address to 0xFF800000
Kernel only reserves the page frames it actually needs
Memory for multiboot2 headers is freed
Video memory and APIC registers are dynamically mapped into linear addresses

src/x86/entry.S

@@ -30,7 +30,7 @@
 
 .set tagEntryType, 3
 .set tagEntrySize, 12
-.set tagEntryAddress, _start - (0xFF900000 - 0x100000)
+.set tagEntryAddress, _start - (0xFF800000 - 0x100000)
 
 .set tagModuleAlignType, 6
 .set tagModuleAlignSize, 8
@@ -108,19 +108,6 @@ _tempIdentityMap:
 .skip 4096
 _tempPgTable:
 .skip 4096
-
-_bootCmdLine:
-.skip 64
-
-.align 64
-.global system_info
-system_info:
-.skip 16
-
-.align 64
-.global memory_map
-memory_map:
-.skip 16 * 16
 	
 .section .text
 .global _start
@@ -152,13 +139,22 @@ _start:
 	sub $BASE_DIFF, %eax
 	push %eax
 
+	# Push ending physical address to map
+	mov (%ebx), %eax
+	add %ebx, %eax
+	push %eax
+
+	# Push starting physical address to map
+	mov $PHYSICAL_BASE, %eax
+	push %eax
+
 	# Load physical address of startPaging()
 	mov $start_paging, %eax
 	sub $BASE_DIFF, %eax
 
 	# Initialize paging
 	call *%eax
-
+	
 	# Jump into mapped kernel binary
 	lea 1f, %eax
 	jmp *%eax
@@ -173,7 +169,7 @@ _start:
 
 	# Change EBX to point to the virtual address of the multiboot info
 	# If the new pointer is out-of-bounds, error
-	add $0xFF800000, %ebx
+	add $0xFF700000, %ebx
 	cmp $0xFF800000, %ebx
 	jl .err
 	cmp $0xFFC00000, %ebx