47 lines
1.4 KiB
PHP
47 lines
1.4 KiB
PHP
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2009-2017. 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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$Revision$
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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, BOOT_LO.memmap_blocks
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mov [BOOT_LO.memmap_block_cnt], ebx ; no blocks yet
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mov ecx, 20
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mov edx, 'PAMS' ; 'SMAP'
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int 15h
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jc no_E820
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cmp eax, 'PAMS'
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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 [BOOT_LO.memmap_block_cnt]
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add di, sizeof.e820entry
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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 [BOOT_LO.memmap_block_cnt], MAX_MEMMAP_BLOCKS
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jz 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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