Save progess, then delete GDT for rewrite

This commit saves the progress made on the GDT; the files are deleted
quickly thereafter as the code was quite buggy.

i386/loader/src-asm/memory/gdt.asm

@@ -26,8 +26,8 @@ gdt_set_segment:
 
 .get_work_address:
     mov eax, [ebp - 4]
-    mov edx, GDT_ENTRY_SIZE
-    mul edx
+    shl eax, 3
+    add eax, GDT_MEMORY_AREA
     mov [esi], eax
 
 .prepare_flags_and_access_byte:
@@ -45,22 +45,23 @@ gdt_set_segment:
 
     xor al, al
     or al, (1 << 7) ; Present-Bit
-    cmp [ebp - 15], byte 0
+
+    cmp [ebp - 16], byte 0
     je .after_task_segment_bit_setter
     or al, (1 << 4)
 .after_task_segment_bit_setter:
 
-    cmp [ebp - 14], byte 0
+    cmp [ebp - 15], byte 0
     je .after_executable_bit_setter
     or al, (1 << 3)
 .after_executable_bit_setter:
 
-    cmp [ebp - 13], byte 0
+    cmp [ebp - 14], byte 0
     je .after_direction_bit_setter
     or al, (1 << 2)
 .after_direction_bit_setter:
 
-    cmp [ebp - 12], byte 0
+    cmp [ebp - 13], byte 0
     je .after_read_write_bit_setter
     or al, (1 <<  1)
 .after_read_write_bit_setter:
@@ -105,6 +106,8 @@ gdt_set_segment:
     pop dword esi
     ret
 
+
+
 db "load_flat_gdt"
 ; [Furthest from EBP]
 ;   0.      4B Return address
@@ -120,15 +123,17 @@ load_flat_gdt:
     mov [esi + (64 - 16)], edx
     mov [esi + (64 - 20)], edi
     mov eax, [ebp - 4]
+
     mov [esi + 20], eax
 
 .create_gdt:
+
     push ebp
     mov ebp, esp
-    push dword (GDT_MEMORY_AREA)
-    push dword (GDT_ENTRIES_CAPACITY * GDT_ENTRY_SIZE)
-    push dword 0
-    call mem_set
+    push dword (GDT_MEMORY_AREA - 16)
+    push dword gdt_identifier_text
+    push dword 8
+    call mem_copy
     mov esp, ebp
     pop ebp
 
@@ -136,7 +141,7 @@ load_flat_gdt:
     push ebp
     mov ebp, esp
     push dword 1
-    push dword 0x0a00
+    push dword 0
     push dword 0xfffff
     push byte 1
     push byte 0
@@ -150,8 +155,8 @@ load_flat_gdt:
     push ebp
     mov ebp, esp
     push dword 2
-    push dword 0
-    push dword 0xfffff
+    push dword LOWER_STACK_POINTER
+    push dword 0fxffff
     push byte 1
     push byte 1
     push byte 0
@@ -186,23 +191,33 @@ load_flat_gdt:
     mov ax, (2 << 3)
     mov ss, ax
 
-    jmp dword (1 << 3):.epilog
-.epilog:
+    ; mov eax, cr0
+    ; or eax, 1
+    ; mov cr0, eax
+
+    cli
+    jmp dword 1:.after_far_jump
+
+.after_far_jump:
     mov eax, cr0
     or eax, 1
     mov cr0, eax
 
+    mov esi, [esi + 20]
+    jmp esi
+    
     mov ebx, [esi + (64 - 8)]
     mov ecx, [esi + (64 - 12)]
     mov edx, [esi + (64 - 16)]
     mov edi, [esi + (64 - 20)]
 
-    mov esi, [esi + 20]
-    jmp esi
 
 align 16
 .gdtr:
 .gdtr.length:
     dw 31
 .gdtr.address:
-    dd GDT_MEMORY_AREA
+    dd GDT_MEMORY_AREA
+
+gdt_identifier_text:
+    db "GDT !!!!"