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2288 clevermous 1 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;                                                              ;;
10051 ace_dent 3 
;; Copyright (C) KolibriOS team 2009-2024. All rights reserved. ;;
2288 clevermous 4 
;; Distributed under terms of the GNU General Public License    ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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4850 mario79 8 
 
2288 clevermous 9 
; 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
7132 dunkaist 18 
        mov     di, BOOT_LO.memmap_blocks
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        mov     [BOOT_LO.memmap_block_cnt], ebx ; no blocks yet
2288 clevermous 20 
        mov     ecx, 20
7122 dunkaist 21 
        mov     edx, 'PAMS' ; 'SMAP'
2288 clevermous 22 
        int     15h
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        jc      no_E820
7122 dunkaist 24 
        cmp     eax, 'PAMS'
2288 clevermous 25 
        jnz     no_E820
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e820_mem_loop:
2466 Serge 27 
;        cmp     byte [di+16], 1 ; ignore non-free areas
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;        jnz     e820_mem_next
7132 dunkaist 29 
        inc     byte [BOOT_LO.memmap_block_cnt]
7122 dunkaist 30 
        add     di, sizeof.e820entry
2288 clevermous 31 
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
7132 dunkaist 35 
        cmp     byte [BOOT_LO.memmap_block_cnt], MAX_MEMMAP_BLOCKS
7122 dunkaist 36 
        jz      e820_test_done
2288 clevermous 37 
        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