| 0,0 → 1,43 |
|---|
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| ;; ;; |
| ;; Copyright (C) KolibriOS team 2009-2011. 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 |