kolibrios/kernel/trunk/detect/biosmem.inc

44 lines
1.4 KiB
PHP
Raw Normal View History

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2009. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Query physical memory map from BIOS.
; diamond, 2009
push ds
; first call to fn E820
mov eax, 0xE820
xor ebx, ebx
mov es, bx
mov ds, bx
mov di, 0x9104
mov [di-4], ebx ; no blocks yet
mov ecx, 20
mov edx, 0x534D4150
int 15h
jc no_E820
cmp eax, 0x534D4150
jnz no_E820
e820_mem_loop:
cmp byte [di+16], 1 ; ignore non-free areas
jnz e820_mem_next
inc byte [0x9100]
add di, 20
e820_mem_next:
; consequent calls to fn E820
test ebx, ebx
jz e820_test_done
cmp byte [0x9100], 32
jae e820_test_done
mov eax, 0xE820
int 15h
jc e820_test_done
jmp e820_mem_loop
no_E820:
; let's hope for mem_test from init.inc
e820_test_done:
pop ds