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;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2004-2015. 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: 7130 $
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$Revision: 7132 $
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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_VARS-OS_BASE + BOOT_MEMMAP_BLOCK_CNT], 0
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        cmp     dword [BOOT_LO.memmap_block_cnt], 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_VARS-OS_BASE + BOOT_MEMMAP_BLOCK_CNT]
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        inc     dword [BOOT_LO.memmap_block_cnt]
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        xor     eax, eax
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        xor     eax, eax
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        mov     [BOOT_VARS-OS_BASE + BOOT_MEMMAP_BLOCKS + e820entry.addr.lo], eax
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        mov     [BOOT_LO.memmap_blocks + e820entry.addr.lo], eax
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        mov     [BOOT_VARS-OS_BASE + BOOT_MEMMAP_BLOCKS + e820entry.addr.hi], eax
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        mov     [BOOT_LO.memmap_blocks + e820entry.addr.hi], eax
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        mov     [BOOT_VARS-OS_BASE + BOOT_MEMMAP_BLOCKS + e820entry.size.lo], edi
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        mov     [BOOT_LO.memmap_blocks + e820entry.size.lo], edi
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        mov     [BOOT_VARS-OS_BASE + BOOT_MEMMAP_BLOCKS + e820entry.size.hi], eax
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        mov     [BOOT_LO.memmap_blocks + e820entry.size.hi], eax
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        inc     eax
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        inc     eax
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        mov     [BOOT_VARS-OS_BASE + BOOT_MEMMAP_BLOCKS + e820entry.type], eax
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        mov     [BOOT_LO.memmap_blocks + e820entry.type], 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_VARS-OS_BASE + BOOT_MEMMAP_BLOCKS
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        mov     edi, BOOT_LO.memmap_blocks
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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_VARS-OS_BASE + BOOT_MEMMAP_BLOCKS
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        mov     ebx, BOOT_LO.memmap_blocks
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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
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        push    ebx
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        push    ebx
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        push    edi
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        push    edi
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if defined UEFI
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if defined UEFI
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        ; UEFI loader knows where RSDP is
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        ; UEFI loader knows where RSDP is
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        mov     ebx, [BOOT_ACPI_RSDP]
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        mov     ebx, [BOOT_LO.acpi_rsdp]
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        test    ebx, ebx
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        test    ebx, ebx
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        jz      .done
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        jz      .done
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        call    .check
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        call    .check
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else
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else