forked from KolibriOS/kolibrios
44 lines
1.4 KiB
PHP
44 lines
1.4 KiB
PHP
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
;; ;;
|
||
|
|
;; 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
|