Use mov <reg>, offset <label> instead of lea <label>

Author: phil-opp

src/stage_1.s

@@ -78,7 +78,7 @@ check_int13h_extensions:
     jc no_int13h_extensions
 
 load_rest_of_bootloader_from_disk:
-    lea eax, _rest_of_bootloader_start_addr
+    mov eax, offset _rest_of_bootloader_start_addr
 
     # dap buffer segment
     mov ebx, eax
@@ -90,7 +90,7 @@ load_rest_of_bootloader_from_disk:
     sub eax, ebx
     mov [dap_buffer_addr], ax
 
-    lea eax, _rest_of_bootloader_start_addr
+    mov eax, offset _rest_of_bootloader_start_addr
 
     # number of disk blocks to load
     lea ebx, _rest_of_bootloader_end_addr

src/stage_2.s

@@ -40,8 +40,8 @@ load_kernel_from_disk:
     mov word ptr [dap_blocks], 1
 
     # number of start block
-    lea eax, _kernel_start_addr
-    lea ebx, _start
+    mov eax, offset _kernel_start_addr
+    mov ebx, offset _start
     sub eax, ebx
     shr eax, 9 # divide by 512 (block size)
     mov [dap_start_lba], eax