boot.asm comments

git-svn-id: svn://anubis/hos/trunk@41 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/boot/boot.asm

@@ -70,7 +70,7 @@ segmented_start:
     mov     [CONSOLE_MEMORY+160*8+1*2], cx
 
     add     ebx, VIRTUAL_OFFSET
-    push    eax
+    push    eax                             ; multiboot bootloader magic value
     push    ebx                             ; pointer to multiboot info struct
     call    k_bootstrap
     add     esp, 8
@@ -78,6 +78,11 @@ segmented_start:
     mov     cx, 0x0700 + 'e'
     mov     [CONSOLE_MEMORY+160*8+4*2], cx
 
+    ; at this point paging is still disabled but the PDBR is valid and
+    ; points to a page directory that has all of RAM mapped to the
+    ; beginning of the kernel's virtual address space, and the entire
+    ; kernel mapped in above 0xE000_0000.
+
 idle_loop:
     hlt
     jmp     idle_loop