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Rev 3725 Rev 3908
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;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2004-2012. 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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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 3725 $
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$Revision: 3908 $
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MEM_WB     equ 6               ;write-back memory
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MEM_WB     equ 6               ;write-back memory
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MEM_WC     equ 1               ;write combined memory
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MEM_WC     equ 1               ;write combined memory
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MEM_UC     equ 0               ;uncached memory
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MEM_UC     equ 0               ;uncached memory
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align 4
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align 4
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proc mem_test
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proc mem_test
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; if we have BIOS with fn E820, skip the test
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; if we have BIOS with fn E820, skip the test
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        cmp     dword [BOOT_VAR-OS_BASE + 0x9100], 0
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        cmp     dword [BOOT_VARS-OS_BASE + 0x9100], 0
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        xchg    ebx, dword [edi]
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        xchg    ebx, dword [edi]
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        je      @b
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        je      @b
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        and     eax, not (CR0_CD+CR0_NW) ;enable caching
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        and     eax, not (CR0_CD+CR0_NW) ;enable caching
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        mov     cr0, eax
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        mov     cr0, eax
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        inc     dword [BOOT_VAR-OS_BASE + 0x9100]
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        inc     dword [BOOT_VARS-OS_BASE + 0x9100]
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        xor     eax, eax
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        xor     eax, eax
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        mov     [BOOT_VAR-OS_BASE + 0x9104], eax
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        mov     [BOOT_VARS-OS_BASE + 0x9104], eax
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        mov     [BOOT_VAR-OS_BASE + 0x9108], eax
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        mov     [BOOT_VARS-OS_BASE + 0x9108], eax
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        mov     [BOOT_VAR-OS_BASE + 0x910C], edi
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        mov     [BOOT_VARS-OS_BASE + 0x910C], edi
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        mov     [BOOT_VAR-OS_BASE + 0x9110], eax
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        mov     [BOOT_VARS-OS_BASE + 0x9110], eax
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.ret:
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.ret:
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        ret
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        ret
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endp
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endp
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align 4
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align 4
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proc init_mem
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proc init_mem
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; calculate maximum allocatable address and number of allocatable pages
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; calculate maximum allocatable address and number of allocatable pages
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        mov     edi, BOOT_VAR-OS_BASE + 0x9104
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        mov     edi, BOOT_VARS-OS_BASE + 0x9104
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        mov     ecx, [edi-4]
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        mov     ecx, [edi-4]
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        xor     esi, esi; esi will hold total amount of memory
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        xor     esi, esi; esi will hold total amount of memory
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        xor     edx, edx; edx will hold maximum allocatable address
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        xor     edx, edx; edx will hold maximum allocatable address
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        xor     eax, eax
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        xor     eax, eax
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        cld
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        cld
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        rep stosd
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        rep stosd
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; scan through memory map and mark free areas as available
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; scan through memory map and mark free areas as available
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        mov     ebx, BOOT_VAR-OS_BASE + 0x9104
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        mov     ebx, BOOT_VARS-OS_BASE + 0x9104
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        mov     edx, [ebx-4]
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        mov     edx, [ebx-4]
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.scanmap:
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.scanmap:
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        cmp     [ebx+16], byte 1
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        cmp     [ebx+16], byte 1