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Rev 2455 Rev 2466
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;;                                                              ;;
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;;                                                              ;;
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;; Copyright (C) KolibriOS team 2009-2011. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2009-2011. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License    ;;
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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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; Query physical memory map from BIOS.
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; diamond, 2009
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; diamond, 2009
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        push    ds
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        push    ds
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; first call to fn E820
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; first call to fn E820
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        mov     eax, 0xE820
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        mov     eax, 0xE820
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        xor     ebx, ebx
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        xor     ebx, ebx
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        mov     es, bx
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        mov     es, bx
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        mov     ds, bx
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        mov     ds, bx
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        mov     di, 0x9104
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        mov     di, 0x9104
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        mov     [di-4], ebx ; no blocks yet
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        mov     [di-4], ebx ; no blocks yet
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        mov     ecx, 20
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        mov     ecx, 20
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        mov     edx, 0x534D4150
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        mov     edx, 0x534D4150
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        int     15h
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        int     15h
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        jc      no_E820
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        jc      no_E820
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        cmp     eax, 0x534D4150
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        cmp     eax, 0x534D4150
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        jnz     no_E820
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        jnz     no_E820
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e820_mem_loop:
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e820_mem_loop:
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        cmp     byte [di+16], 1 ; ignore non-free areas
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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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;        jnz     e820_mem_next
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        inc     byte [0x9100]
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        inc     byte [0x9100]
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        add     di, 20
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        add     di, 20
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e820_mem_next:
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e820_mem_next:
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; consequent calls to fn E820
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; consequent calls to fn E820
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        test    ebx, ebx
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        test    ebx, ebx
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        jz      e820_test_done
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        jz      e820_test_done
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        cmp     byte [0x9100], 32
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        cmp     byte [0x9100], 32
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        jae     e820_test_done
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        jae     e820_test_done
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        mov     eax, 0xE820
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        mov     eax, 0xE820
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        int     15h
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        int     15h
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        jc      e820_test_done
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        jc      e820_test_done
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        jmp     e820_mem_loop
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        jmp     e820_mem_loop
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no_E820:
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no_E820:
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; let's hope for mem_test from init.inc
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; let's hope for mem_test from init.inc
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e820_test_done:
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e820_test_done:
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        pop     ds
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        pop     ds