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;**************************************************************************

;

;   [cache_ide[X]_pointer]

;   or [cache_ide[X]_data_pointer]  first entry in cache list

;

;            +0   - lba sector

;            +4   - state of cache sector

;                   0 = empty

;                   1 = used for read  ( same as in hd )

;                   2 = used for write ( differs from hd )

;

;  [cache_ide[X]_system_data]

;  or [cache_ide[x]_appl_data] - cache entries

;

;**************************************************************************

align 4

write_cache:

;-----------------------------------------------------------

; write all changed sectors to disk

;-----------------------------------------------------------

    push  eax ecx edx esi edi

    ; write difference ( 2 ) from cache to hd

;    mov   ecx,cache_max

;    mov   esi,HD_CACHE+8

    call  calculate_cache

    add   esi,8

    mov   edi,1

  write_cache_more:

    cmp   dword [esi+4],2       ; if cache slot is not different

    jne   .write_chain

    mov   dword [esi+4],1       ; same as in hd

    mov   eax,[esi]             ; eax = sector to write

    cmp   eax,[PARTITION_START]

    jb    danger

    cmp   eax,[PARTITION_END]

    ja    danger

; DMA write is permitted only if [allow_dma_access]=1

        cmp     [allow_dma_access], 2

        jae     .nodma

        cmp     [dma_hdd], 1

        jnz     .nodma

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        cmp     ecx, 1

        jz      .nonext

        cmp     dword [esi+8+4], 2

        jnz     .nonext

        push    eax

        inc     eax

        cmp     eax, [esi+8]

        pop     eax

        jnz     .nonext

        cmp     [cache_chain_started], 1

        jz      @f

        mov     [cache_chain_started], 1

        mov     [cache_chain_size], 0

        mov     [cache_chain_pos], edi

        mov     [cache_chain_ptr], esi

@@:

        inc     [cache_chain_size]

        cmp     [cache_chain_size], 64

        jnz     .continue

        jmp     .write_chain

.nonext:

        call    flush_cache_chain

        mov     [cache_chain_size], 1

        mov     [cache_chain_ptr], esi

        call    write_cache_sector

        jmp     .continue

.nodma:

        call    cache_write_pio

.write_chain:

        call    flush_cache_chain

.continue:

  danger:

    add   esi,8

    inc   edi

    dec   ecx

    jnz   write_cache_more

        call    flush_cache_chain

 return_02:

    pop   edi esi edx ecx eax

    ret

flush_cache_chain:

        cmp     [cache_chain_started], 0

        jz      @f

        call    write_cache_chain

        mov     [cache_chain_started], 0

@@:

        ret

align 4

find_empty_slot:

;-----------------------------------------------------------

; find empty or read slot, flush cache if next 10% is used by write

; output : edi = cache slot

;-----------------------------------------------------------

;    push  ecx esi

  search_again:

;    mov   ecx,cache_max*10/100

;    mov   edi,[cache_search_start]

    call  calculate_cache_3

;    push  eax edx

;    mov   eax,ecx

;    mov   ecx,10

;    xor   edx,edx

;    div  ecx

;    mov   ecx,eax

;    pop   edx eax

    shr   ecx,3

  search_for_empty:

    inc   edi

;    cmp   edi,cache_max

;    push   eax

    call  calculate_cache_4

;    cmp   edi,eax

;    pop   eax

    jbe   inside_cache

    mov   edi,1

  inside_cache:

;    cmp   dword [edi*8+HD_CACHE+4],2    ; get cache slot info

    push   esi

    call  calculate_cache_1

    cmp   dword [edi*8+esi+4],2

    pop   esi

    jb    found_slot                    ; it's empty or read

    dec   ecx

    jnz   search_for_empty

    call  write_cache                   ; no empty slots found, write all

    cmp   [hd_error],0

    jne   found_slot_access_denied

    jmp   search_again                  ; and start again

  found_slot:

;    mov   [cache_search_start],edi

    call  calculate_cache_5

  found_slot_access_denied:

    ret

align 4

clear_hd_cache:

;    push  eax ecx edi

;    mov   edi, HD_CACHE

;    mov   ecx,16384

;    xor   eax,eax

;    cld

;    rep   stosd                 ; clear hd cache with 0

;    mov   [cache_search_start],eax

    mov   [fat_in_cache],-1

    mov   [fat_change],0

;    pop   edi ecx eax

    ret

;--------------------------------------------------------------------

align 4

calculate_cache:

;    mov   ecx,cache_max         ; entries in cache

;    mov   esi,HD_CACHE+8

; 1 - IDE0 ... 4 - IDE3

.ide0:

    cmp    [hdpos],1

    jne    .ide1

    cmp    [hdd_appl_data],0

    jne    .ide0_appl_data

    mov    ecx,[cache_ide0_system_sad_size]

    mov    esi,[cache_ide0_pointer]

    ret

.ide0_appl_data:

    mov    ecx,[cache_ide0_appl_sad_size]

    mov    esi,[cache_ide0_data_pointer]

    ret

.ide1:

    cmp    [hdpos],2

    jne    .ide2

    cmp    [hdd_appl_data],0

    jne    .ide1_appl_data

    mov    ecx,[cache_ide1_system_sad_size]

    mov    esi,[cache_ide1_pointer]

    ret

.ide1_appl_data:

    mov    ecx,[cache_ide1_appl_sad_size]

    mov    esi,[cache_ide1_data_pointer]

    ret

.ide2:

    cmp    [hdpos],3

    jne    .ide3

    cmp    [hdd_appl_data],0

    jne    .ide2_appl_data

    mov    ecx,[cache_ide2_system_sad_size]

    mov    esi,[cache_ide2_pointer]

    ret

.ide2_appl_data:

    mov    ecx,[cache_ide2_appl_sad_size]

    mov    esi,[cache_ide2_data_pointer]

    ret

.ide3:

    cmp    [hdd_appl_data],0

    jne    .ide3_appl_data

    mov    ecx,[cache_ide3_system_sad_size]

    mov    esi,[cache_ide3_pointer]

    ret

.ide3_appl_data:

    mov    ecx,[cache_ide3_appl_sad_size]

    mov    esi,[cache_ide3_data_pointer]

    ret

;--------------------------------------------------------------------

align 4

calculate_cache_1:

;    lea   esi,[edi*8+HD_CACHE]

; 1 - IDE0 ... 4 - IDE3

.ide0:

    cmp    [hdpos],1

    jne    .ide1

    cmp    [hdd_appl_data],0

    jne    .ide0_appl_data

    mov    esi,[cache_ide0_pointer]

    ret

.ide0_appl_data:

    mov    esi,[cache_ide0_data_pointer]

    ret

.ide1:

    cmp    [hdpos],2

    jne    .ide2

    cmp    [hdd_appl_data],0

    jne    .ide1_appl_data

    mov    esi,[cache_ide1_pointer]

    ret

.ide1_appl_data:

    mov    esi,[cache_ide1_data_pointer]

    ret

.ide2:

    cmp    [hdpos],3

    jne    .ide3

    cmp    [hdd_appl_data],0

    jne    .ide2_appl_data

    mov    esi,[cache_ide2_pointer]

    ret

.ide2_appl_data:

    mov    esi,[cache_ide2_data_pointer]

    ret

.ide3:

    cmp    [hdd_appl_data],0

    jne    .ide3_appl_data

    mov    esi,[cache_ide3_pointer]

    ret

.ide3_appl_data:

    mov    esi,[cache_ide3_data_pointer]

    ret

;--------------------------------------------------------------------

align 4

calculate_cache_2:

;    add   esi,HD_CACHE+65536

; 1 - IDE0 ... 4 - IDE3

.ide0:

    cmp    [hdpos],1

    jne    .ide1

    cmp    [hdd_appl_data],0

    jne    .ide0_appl_data

    mov    eax,[cache_ide0_system_data]

    ret

.ide0_appl_data:

    mov    eax,[cache_ide0_appl_data]

    ret

.ide1:

    cmp    [hdpos],2

    jne    .ide2

    cmp    [hdd_appl_data],0

    jne    .ide1_appl_data

    mov    eax,[cache_ide1_system_data]

    ret

.ide1_appl_data:

    mov    eax,[cache_ide1_appl_data]

    ret

.ide2:

    cmp    [hdpos],3

    jne    .ide3

    cmp    [hdd_appl_data],0

    jne    .ide2_appl_data

    mov    eax,[cache_ide2_system_data]

    ret

.ide2_appl_data:

    mov    eax,[cache_ide2_appl_data]

    ret

.ide3:

    cmp    [hdd_appl_data],0

    jne    .ide3_appl_data

    mov    eax,[cache_ide3_system_data]

    ret

.ide3_appl_data:

    mov    eax,[cache_ide3_appl_data]

    ret

;--------------------------------------------------------------------

align 4

calculate_cache_3:

;    mov   ecx,cache_max*10/100

;    mov   edi,[cache_search_start]

; 1 - IDE0 ... 4 - IDE3

.ide0:

    cmp    [hdpos],1

    jne    .ide1

    cmp    [hdd_appl_data],0

    jne    .ide0_appl_data

    mov    ecx,[cache_ide0_system_sad_size]

    mov    edi,[cache_ide0_search_start]

    ret

.ide0_appl_data:

    mov    ecx,[cache_ide0_appl_sad_size]

    mov    edi,[cache_ide0_appl_search_start]

    ret

.ide1:

    cmp    [hdpos],2

    jne    .ide2

    cmp    [hdd_appl_data],0

    jne    .ide1_appl_data

    mov    ecx,[cache_ide1_system_sad_size]

    mov    edi,[cache_ide1_search_start]

    ret

.ide1_appl_data:

    mov    ecx,[cache_ide1_appl_sad_size]

    mov    edi,[cache_ide1_appl_search_start]

    ret

.ide2:

    cmp    [hdpos],3

    jne    .ide3

    cmp    [hdd_appl_data],0

    jne    .ide2_appl_data

    mov    ecx,[cache_ide2_system_sad_size]

    mov    edi,[cache_ide2_search_start]

    ret

.ide2_appl_data:

    mov    ecx,[cache_ide2_appl_sad_size]

    mov    edi,[cache_ide2_appl_search_start]

    ret

.ide3:

    cmp    [hdd_appl_data],0

    jne    .ide3_appl_data

    mov    ecx,[cache_ide3_system_sad_size]

    mov    edi,[cache_ide3_search_start]

    ret

.ide3_appl_data:

    mov    ecx,[cache_ide3_appl_sad_size]

    mov    edi,[cache_ide3_appl_search_start]

    ret

;--------------------------------------------------------------------

align 4

calculate_cache_4:

;    cmp   edi,cache_max

; 1 - IDE0 ... 4 - IDE3

.ide0:

    cmp    [hdpos],1

    jne    .ide1

    cmp    [hdd_appl_data],0

    jne    .ide0_appl_data

    cmp   edi,[cache_ide0_system_sad_size]

    ret

.ide0_appl_data:

    cmp   edi,[cache_ide0_appl_sad_size]

    ret

.ide1:

    cmp    [hdpos],2

    jne    .ide2

    cmp    [hdd_appl_data],0

    jne    .ide1_appl_data

    cmp   edi,[cache_ide1_system_sad_size]

    ret

.ide1_appl_data:

    cmp   edi,[cache_ide1_appl_sad_size]

    ret

.ide2:

    cmp    [hdpos],3

    jne    .ide3

    cmp    [hdd_appl_data],0

    jne    .ide2_appl_data

    cmp   edi,[cache_ide2_system_sad_size]

    ret

.ide2_appl_data:

    cmp   edi,[cache_ide2_appl_sad_size]

    ret

.ide3:

    cmp    [hdd_appl_data],0

    jne    .ide3_appl_data

    cmp   edi,[cache_ide3_system_sad_size]

    ret

.ide3_appl_data:

    cmp   edi,[cache_ide3_appl_sad_size]

    ret

;--------------------------------------------------------------------

align 4

calculate_cache_5:

;    mov   [cache_search_start],edi

; 1 - IDE0 ... 4 - IDE3

.ide0:

    cmp    [hdpos],1

    jne    .ide1

    cmp    [hdd_appl_data],0

    jne    .ide0_appl_data

    mov   [cache_ide0_search_start],edi

    ret

.ide0_appl_data:

    mov   [cache_ide0_appl_search_start],edi

    ret

.ide1:

    cmp    [hdpos],2

    jne    .ide2

    cmp    [hdd_appl_data],0

    jne    .ide1_appl_data

    mov   [cache_ide1_search_start],edi

    ret

.ide1_appl_data:

    mov   [cache_ide1_appl_search_start],edi

    ret

.ide2:

    cmp    [hdpos],3

    jne    .ide3

    cmp    [hdd_appl_data],0

    jne    .ide2_appl_data

    mov   [cache_ide2_search_start],edi

    ret

.ide2_appl_data:

    mov   [cache_ide2_appl_search_start],edi

    ret

.ide3:

    cmp    [hdd_appl_data],0

    jne    .ide3_appl_data

    mov   [cache_ide3_search_start],edi

    ret

.ide3_appl_data:

    mov   [cache_ide3_appl_search_start],edi

    ret

;--------------------------------------------------------------------

align 4

calculate_linear_to_real:

    shr eax, 12

    mov eax, [page_tabs+eax*4]

    and eax, 0xFFFFF000

    ret