Subversion Repositories Kolibri OS

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;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;

;; Distributed under terms of the GNU General Public License    ;;

;;                                                              ;;

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$Revision: 3908 $

        pusha

        mov     eax, [pg_data.pages_free]

;   1/32

        shr     eax, 5

;   round off up to 8 pages

        shr     eax, 3

        shl     eax, 3

;   translate pages in butes *4096

        shl     eax, 12

;       check a upper size of the cache, no more than 1 Mb on the physical device

        cmp     eax, 1024*1024

        jbe     @f

        mov     eax, 1024*1024

        jmp     .continue

@@:

;       check a lower size of the cache, not less than 128 Kb on the physical device

        cmp     eax, 128*1024

        jae     @f

        mov     eax, 128*1024

@@:

.continue:

        mov     [cache_ide0_size], eax

        mov     [cache_ide1_size], eax

        mov     [cache_ide2_size], eax

        mov     [cache_ide3_size], eax

        xor     eax, eax

        mov     [hdd_appl_data], 1;al

        mov     [cd_appl_data], 1

        test    byte [DRIVE_DATA+1], 2

        je      .ide2

        mov     esi, cache_ide3

        call    get_cache_ide

.ide2:

        test    byte [DRIVE_DATA+1], 8

        je      .ide1

        mov     esi, cache_ide2

        call    get_cache_ide

.ide1:

        test    byte [DRIVE_DATA+1], 0x20

        je      .ide0

        mov     esi, cache_ide1

        call    get_cache_ide

.ide0:

        test    byte [DRIVE_DATA+1], 0x80

        je      @f

        mov     esi, cache_ide0

        call    get_cache_ide

@@:

        jmp     end_get_cache

get_cache_ide:

        and     [esi+cache_ide0_search_start-cache_ide0], 0

        and     [esi+cache_ide0_appl_search_start-cache_ide0], 0

        push    ecx

        stdcall kernel_alloc, [esi+cache_ide0_size-cache_ide0]

        mov     [esi+cache_ide0_pointer-cache_ide0], eax

        pop     ecx

        mov     edx, eax

        mov     eax, [esi+cache_ide0_size-cache_ide0]

        shr     eax, 3

        mov     [esi+cache_ide0_system_data_size-cache_ide0], eax

        mov     ebx, eax

        imul    eax, 7

        mov     [esi+cache_ide0_appl_data_size-cache_ide0], eax

        add     ebx, edx

        mov     [esi+cache_ide0_data_pointer-cache_ide0], ebx

.cd:

        push    ecx

        mov     eax, [esi+cache_ide0_system_data_size-cache_ide0]

        call    calculate_for_cd

        add     eax, [esi+cache_ide0_pointer-cache_ide0]

        mov     [esi+cache_ide0_system_data-cache_ide0], eax

        mov     [esi+cache_ide0_system_sad_size-cache_ide0], ecx

        push    edi

        mov     edi, [esi+cache_ide0_pointer-cache_ide0]

        call    clear_ide_cache

        pop     edi

        mov     eax, [esi+cache_ide0_appl_data_size-cache_ide0]

        call    calculate_for_cd

        add     eax, [esi+cache_ide0_data_pointer-cache_ide0]

        mov     [esi+cache_ide0_appl_data-cache_ide0], eax

        mov     [esi+cache_ide0_appl_sad_size-cache_ide0], ecx

        push    edi

        mov     edi, [esi+cache_ide0_data_pointer-cache_ide0]

        call    clear_ide_cache

        pop     edi

        pop     ecx

        ret

calculate_for_cd:

        push    eax

        mov     ebx, eax

        shr     eax, 11

        shl     eax, 3

        sub     ebx, eax

        shr     ebx, 11

        mov     ecx, ebx

        shl     ebx, 11

        pop     eax

        sub     eax, ebx

        dec     ecx

        ret

clear_ide_cache:

        push    eax

        shl     ecx, 1

        xor     eax, eax

        cld

        rep stosd

        pop     eax

        ret

end_get_cache:

        popa