2011-10-14 23:38:50 +02:00
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2009. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Query physical memory map from BIOS.
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; diamond, 2009
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push ds
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; first call to fn E820
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mov eax, 0xE820
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xor ebx, ebx
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mov es, bx
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mov ds, bx
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mov di, 0x9104
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mov [di-4], ebx ; no blocks yet
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mov ecx, 20
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mov edx, 0x534D4150
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int 15h
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jc no_E820
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cmp eax, 0x534D4150
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jnz no_E820
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e820_mem_loop:
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cmp byte [di+16], 1 ; ignore non-free areas
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jnz e820_mem_next
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inc byte [0x9100]
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add di, 20
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e820_mem_next:
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; consequent calls to fn E820
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test ebx, ebx
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jz e820_test_done
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cmp byte [0x9100], 32
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jae e820_test_done
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mov eax, 0xE820
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int 15h
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jc e820_test_done
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jmp e820_mem_loop
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no_E820:
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; let's hope for mem_test from init.inc
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e820_test_done:
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pop ds
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