kolibrios-gitea/kernel/branches/net/fs/fs.inc

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                              ;;
;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
;;                                                              ;;
;; System service for filesystem call                           ;;
;; (C) 2004 Ville Turjanmaa, License: GPL                       ;;
;; 29.04.2006 Elimination of hangup after the                   ;;
;;            expiration hd_wait_timeout (for LBA) -  Mario79   ;;
;; 15.01.2005 get file size/attr/date,                          ;;
;;            file_append (only for hd) - ATV                   ;;
;; 23.11.2004 test if hd/partition is set - ATV                 ;;
;; 18.11.2004 get_disk_info and more error codes - ATV          ;;
;; 08.11.2004 expand_pathz and rename (only for hd) - ATV       ;;
;; 20.10.2004 Makedir/Removedir (only for hd) - ATV             ;;
;;                                                              ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision $


iglobal
dir0:
             db  'HARDDISK   '
             db  'RAMDISK    '
             db  'FLOPPYDISK '
             db  0

dir1:
             db  'FIRST      '
             db  'SECOND     '
             db  'THIRD      '
             db  'FOURTH     '
             db  0

not_select_IDE db 0

hd_address_table:
                   dd  0x1f0,0x00,0x1f0,0x10
                   dd  0x170,0x00,0x170,0x10
endg

file_system:

; IN:
;
; eax = 0  ; read file          /RamDisk/First  6
; eax = 8  ; lba read
; eax = 15 ; get_disk_info
;
; OUT:
;
; eax = 0  : read ok
; eax = 1  : no hd base and/or partition defined
; eax = 2  : function is unsupported for this FS
; eax = 3  : unknown FS
; eax = 4  : partition not defined at hd
; eax = 5  : file not found
; eax = 6  : end of file
; eax = 7  : memory pointer not in application area
; eax = 8  : disk full
; eax = 9  : fat table corrupted
; eax = 10 : access denied
; eax = 11 : disk error
;
; ebx = size

; \begin{diamond}[18.03.2006]
; for subfunction 16 (start application) error codes must be negative
;    because positive values are valid PIDs
; so possible return values are:
; eax > 0 : process created, eax=PID

; -0x10 <= eax < 0 : -eax is filesystem error code:
; eax = -1  = 0xFFFFFFFF : no hd base and/or partition defined
; eax = -3  = 0xFFFFFFFD : unknown FS
; eax = -5  = 0xFFFFFFFB : file not found
; eax = -6  = 0xFFFFFFFA : unexpected end of file (probably not executable file)
; eax = -9  = 0xFFFFFFF7 : fat table corrupted
; eax = -10 = 0xFFFFFFF6 : access denied

; -0x20 <= eax < -0x10: eax is process creation error code:
; eax = -0x20 = 0xFFFFFFE0 : too many processes
; eax = -0x1F = 0xFFFFFFE1 : not Menuet/Kolibri executable
; eax = -0x1E = 0xFFFFFFE2 : no memory

; ebx is not changed

; \end{diamond}[18.03.2006]

    ; Extract parameters
 ;   add    eax, std_application_base_address    ; abs start of info block

        cmp     dword [eax+0], 15; GET_DISK_INFO
        je      fs_info

        cmp     dword [CURRENT_TASK], 1; no memory checks for kernel requests
        jz      no_checks_for_kernel
        mov     edx, eax
        cmp     dword [eax+0], 1
        jnz     .usual_check
        mov     ebx, [eax+12]
 ;   add   ebx,std_application_base_address
        mov     ecx, [eax+8]
        call    check_region
        test    eax, eax
        jnz     area_in_app_mem

.error_output:
        mov     esi, buffer_failed
        call    sys_msg_board_str
;    mov   eax,7
        mov     dword [esp+36], 7
        ret
iglobal
  buffer_failed db 'K : Buffer check failed',13,10,0
endg
.usual_check:
        cmp     dword [eax+0], 0
        mov     ecx, 512
        jnz     .small_size
        mov     ecx, [eax+8]
        shl     ecx, 9
.small_size:
        mov     ebx, [eax+12]
 ;   add   ebx,std_application_base_address
        call    check_region
        test    eax, eax
        jz      .error_output
  area_in_app_mem:
        mov     eax, edx
  no_checks_for_kernel:

  fs_read:

        mov     ebx, [eax+20]   ; program wants root directory ?
        test    bl, bl
        je      fs_getroot
        test    bh, bh
        jne     fs_noroot
  fs_getroot:
; \begin{diamond}[18.03.2006]
; root - only read is allowed
; other operations return "access denied", eax=10
; (execute operation returns eax=-10)
        cmp     dword [eax], 0
        jz      .read_root
        mov     dword [esp+36], 10
        ret
.read_root:
; \end{diamond}[18.03.2006]
        mov     esi, dir0
        mov     edi, [eax+12]
 ;   add   edi,std_application_base_address
        mov     ecx, 11
        push    ecx
;    cld    ; already is
        rep movsb
        mov     al, 0x10
        stosb
        add     edi, 32-11-1
        pop     ecx
        rep movsb
        stosb
        and     dword [esp+36], 0; ok read
        mov     dword [esp+24], 32*2; size of root
        ret

  fs_info:                      ;start of code - Mihasik
        push    eax
        cmp     [eax+21], byte 'r'
        je      fs_info_r
        cmp     [eax+21], byte 'R'
        je      fs_info_r
        mov     eax, 3          ;if unknown disk
        xor     ebx, ebx
        xor     ecx, ecx
        xor     edx, edx
        jmp     fs_info1
  fs_info_r:
        call    ramdisk_free_space;if ramdisk
        mov     ecx, edi        ;free space in ecx
        shr     ecx, 9          ;free clusters
        mov     ebx, 2847       ;total clusters
        mov     edx, 512        ;cluster size
        xor     eax, eax        ;always 0
  fs_info1:
        pop     edi
        mov     [esp+36], eax
        mov     [esp+24], ebx    ; total clusters on disk
        mov     [esp+32], ecx    ; free clusters on disk
        mov     [edi], edx       ; cluster size in bytes
        ret                      ;end of code - Mihasik

  fs_noroot:

        push    dword [eax+0]   ; read/write/delete/.../makedir/rename/lba/run
        push    dword [eax+4]   ; 512 block number to read
        push    dword [eax+8]   ; bytes to write/append or 512 blocks to read
        mov     ebx, [eax+12]
 ;   add   ebx,std_application_base_address
        push    ebx             ; abs start of return/save area

        lea     esi, [eax+20]   ; abs start of dir + filename
        mov     edi, [eax+16]
 ;   add   edi,std_application_base_address    ; abs start of work area

        call    expand_pathz

        push    edi             ; dir start
        push    ebx             ; name of file start

        mov     eax, [edi+1]
        cmp     eax, 'RD  '
        je      fs_yesramdisk
        cmp     eax, 'RAMD'
        jne     fs_noramdisk

  fs_yesramdisk:

        cmp     byte [edi+1+11], 0
        je      fs_give_dir1

        mov     eax, [edi+1+12]
        cmp     eax, '1   '
        je      fs_yesramdisk_first
        cmp     eax, 'FIRS'
        jne     fs_noramdisk

  fs_yesramdisk_first:

        cmp     dword [esp+20], 8; LBA read ramdisk
        jne     fs_no_LBA_read_ramdisk

        mov     eax, [esp+16]   ; LBA block to read
        mov     ecx, [esp+8]    ; abs pointer to return area

        call    LBA_read_ramdisk
        jmp     file_system_return


  fs_no_LBA_read_ramdisk:

        cmp     dword [esp+20], 0; READ
        jne     fs_noramdisk_read

        mov     eax, [esp+4]    ; fname
        add     eax, 2*12+1
        mov     ebx, [esp+16]   ; block start
        inc     ebx
        mov     ecx, [esp+12]   ; block count
        mov     edx, [esp+8]    ; return
        mov     esi, [esp+0]
        sub     esi, eax
        add     esi, 12+1       ; file name length
        call    fileread

        jmp     file_system_return


  fs_noramdisk_read:
  fs_noramdisk:

  ;********************************************************************
        mov     eax, [edi+1]
        cmp     eax, 'FD  '
        je      fs_yesflpdisk
        cmp     eax, 'FLOP'
        jne     fs_noflpdisk

  fs_yesflpdisk:
        call    reserve_flp

        cmp     byte [edi+1+11], 0
        je      fs_give_dir1

        mov     eax, [edi+1+12]
        cmp     eax, '1   '
        je      fs_yesflpdisk_first
        cmp     eax, 'FIRS'
        je      fs_yesflpdisk_first
        cmp     eax, '2   '
        je      fs_yesflpdisk_second
        cmp     eax, 'SECO'
        jne     fs_noflpdisk
        jmp     fs_yesflpdisk_second

  fs_yesflpdisk_first:
        mov     [flp_number], 1
        jmp     fs_yesflpdisk_start
  fs_yesflpdisk_second:
        mov     [flp_number], 2
  fs_yesflpdisk_start:
        cmp     dword [esp+20], 0; READ
        jne     fs_noflpdisk_read

        mov     eax, [esp+4]    ; fname
        add     eax, 2*12+1
        mov     ebx, [esp+16]   ; block start
        inc     ebx
        mov     ecx, [esp+12]   ; block count
        mov     edx, [esp+8]    ; return
        mov     esi, [esp+0]
        sub     esi, eax
        add     esi, 12+1       ; file name length
        call    floppy_fileread

        jmp     file_system_return


  fs_noflpdisk_read:
  fs_noflpdisk:
  ;*****************************************************************

        mov     eax, [edi+1]
        cmp     eax, 'HD0 '
        je      fs_yesharddisk_IDE0
        cmp     eax, 'HD1 '
        je      fs_yesharddisk_IDE1
        cmp     eax, 'HD2 '
        je      fs_yesharddisk_IDE2
        cmp     eax, 'HD3 '
        je      fs_yesharddisk_IDE3
        jmp     old_path_harddisk
fs_yesharddisk_IDE0:
        call    reserve_hd1
        mov     [hdbase], 0x1f0
        mov     [hdid], 0x0
        mov     [hdpos], 1
        jmp     fs_yesharddisk_partition
fs_yesharddisk_IDE1:
        call    reserve_hd1
        mov     [hdbase], 0x1f0
        mov     [hdid], 0x10
        mov     [hdpos], 2
        jmp     fs_yesharddisk_partition
fs_yesharddisk_IDE2:
        call    reserve_hd1
        mov     [hdbase], 0x170
        mov     [hdid], 0x0
        mov     [hdpos], 3
        jmp     fs_yesharddisk_partition
fs_yesharddisk_IDE3:
        call    reserve_hd1
        mov     [hdbase], 0x170
        mov     [hdid], 0x10
        mov     [hdpos], 4
fs_yesharddisk_partition:
        call    reserve_hd_channel
;    call  choice_necessity_partition
;    jmp   fs_yesharddisk_all
        jmp     fs_for_new_semantic

choice_necessity_partition:
        mov     eax, [edi+1+12]
        call    StringToNumber
        mov     [fat32part], eax
choice_necessity_partition_1:
        mov     ecx, [hdpos]
        xor     eax, eax
        mov     [hd_entries], eax; entries in hd cache
        mov     edx, DRIVE_DATA+2
        cmp     ecx, 0x80
        jb      search_partition_array
        mov     ecx, 4
 search_partition_array:
        mov     bl, [edx]
        movzx   ebx, bl
        add     eax, ebx
        inc     edx
        loop    search_partition_array
        mov     ecx, [hdpos]
        mov     edx, BiosDiskPartitions
        sub     ecx, 0x80
        jb      .s
        je      .f
 @@:
        mov     ebx, [edx]
        add     edx, 4
        add     eax, ebx
        loop    @b
        jmp     .f
 .s:
        sub     eax, ebx
 .f:
        add     eax, [known_part];   add   eax,[fat32part]
        dec     eax
        xor     edx, edx
        imul    eax, 100
        add     eax, DRIVE_DATA+0xa
        mov     [transfer_adress], eax
        call    partition_data_transfer_1
        ret

 old_path_harddisk:
        mov     eax, [edi+1]
        cmp     eax, 'HD  '
        je      fs_yesharddisk
        cmp     eax, 'HARD'
        jne     fs_noharddisk

  fs_yesharddisk:
        cmp     dword [esp+20], 8; LBA read
        jne     fs_no_LBA_read
        mov     eax, [esp+16]   ; LBA block to read
        lea     ebx, [edi+1+12] ; pointer to FIRST/SECOND/THIRD/FOURTH
        mov     ecx, [esp+8]    ; abs pointer to return area
        call    LBA_read
        jmp     file_system_return

  fs_no_LBA_read:

        cmp     byte [edi+1+11], 0; directory read
        je      fs_give_dir1
        call    reserve_hd1
 fs_for_new_semantic:
        call    choice_necessity_partition

  fs_yesharddisk_all:
        mov     eax, 1
        mov     ebx, [esp+24+24]
        cmp     [hdpos], 0      ; is hd base set?
        jz      hd_err_return
        cmp     [fat32part], 0  ; is partition set?
        jnz     @f
hd_err_return:
        call    free_hd_channel
        and     [hd1_status], 0
        jmp     file_system_return
@@:

        call    free_hd_channel
        and     [hd1_status], 0

  fs_noharddisk:
; \begin{diamond}[18.03.2006]
        mov     eax, 5   ; file not found
; <EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
        mov     ebx, [esp+24+24]; do not change ebx in application
; \end{diamond}[18.03.2006]

  file_system_return:

        add     esp, 24

        mov     [esp+36], eax
        mov     [esp+24], ebx
        ret


  fs_give_dir1:

; \begin{diamond}[18.03.2006]
; /RD,/FD,/HD - only read is allowed
; other operations return "access denied", eax=10
; (execute operation returns eax=-10)
        cmp     dword [esp+20], 0
        jz      .read
        add     esp, 20
        pop     ecx
        mov     dword [esp+36], 10
        ret
.read:
; \end{diamond}[18.03.2006]
        mov     al, 0x10
        mov     ebx, 1
        mov     edi, [esp+8]
        mov     esi, dir1
  fs_d1_new:
        mov     ecx, 11
;    cld
        rep movsb
        stosb
        add     edi, 32-11-1
        dec     ebx
        jne     fs_d1_new

        add     esp, 24

        and     dword [esp+36], 0; ok read
        mov     dword [esp+24], 32*1; dir/data size
        ret



LBA_read_ramdisk:

        cmp     [lba_read_enabled], 1
        je      lbarrl1

        xor     ebx, ebx
        mov     eax, 2
        ret

  lbarrl1:

        cmp     eax, 18*2*80
        jb      lbarrl2
        xor     ebx, ebx
        mov     eax, 3
        ret

  lbarrl2:

        pushad

        call    restorefatchain

        mov     edi, ecx
        mov     esi, eax

        shl     esi, 9
        add     esi, RAMDISK
        mov     ecx, 512/4
;    cld
        rep movsd

        popad

        xor     ebx, ebx
        xor     eax, eax
        ret

LBA_read:

; IN:
;
; eax = LBA block to read
; ebx = pointer to FIRST/SECOND/THIRD/FOURTH
; ecx = abs pointer to return area

        cmp     [lba_read_enabled], 1
        je      lbarl1
        mov     eax, 2
        ret

  lbarl1:

        call    reserve_hd1

        push    eax
        push    ecx

        mov     edi, hd_address_table
        mov     esi, dir1
        mov     eax, [ebx]
        mov     edx, '1   '
        mov     ecx, 4
  blar0:
        cmp     eax, [esi]
        je      blar2
        cmp     eax, edx
        je      blar2
        inc     edx
        add     edi, 8
        add     esi, 11
        dec     ecx
        jnz     blar0

        mov     eax, 1
        mov     ebx, 1
        jmp     LBA_read_ret

  blar2:
        mov     eax, [edi+0]
        mov     ebx, [edi+4]

        mov     [hdbase], eax
        mov     [hdid], ebx

        call    wait_for_hd_idle
        cmp     [hd_error], 0
        jne     hd_lba_error

    ; eax = hd port
    ; ebx = set for primary (0x00) or slave (0x10)

        cli

        mov     edx, eax
        inc     edx
        xor     eax, eax
        out     dx, al
        inc     edx
        inc     eax
        out     dx, al
        inc     edx
        mov     eax, [esp+4]
        out     dx, al
        shr     eax, 8
        inc     edx
        out     dx, al
        shr     eax, 8
        inc     edx
        out     dx, al
        shr     eax, 8
        inc     edx
        and     al, 1+2+4+8
        add     al, bl
        add     al, 128+64+32
        out     dx, al

        inc     edx
        mov     al, 20h
        out     dx, al

        sti

        call    wait_for_sector_buffer
        cmp     [hd_error], 0
        jne     hd_lba_error

        cli

        mov     edi, [esp+0]
        mov     ecx, 256
        sub     edx, 7
        cld
        rep insw

        sti

        xor     eax, eax
        xor     ebx, ebx

  LBA_read_ret:
        mov     [hd_error], 0
        mov     [hd1_status], 0
        add     esp, 2*4

        ret


expand_pathz:
; IN:
;   esi = asciiz path & file
;   edi = buffer for path & file name
; OUT:
;   edi = directory & file : / 11 + / 11 + / 11 - zero terminated
;   ebx = /file name - zero terminated
;   esi = pointer after source

        push    eax
        push    ecx
        push    edi;[esp+0]

  pathz_start:
        mov     byte [edi], '/'
        inc     edi
        mov     al, 32
        mov     ecx, 11
        cld
        rep stosb               ; clear filename area
        sub     edi, 11
        mov     ebx, edi        ; start of dir/file name

  pathz_new_char:
        mov     al, [esi]
        inc     esi
        cmp     al, 0
        je      pathz_end

        cmp     al, '/'
        jne     pathz_not_path
        cmp     edi, ebx        ; skip first '/'
        jz      pathz_new_char
        lea     edi, [ebx+11]   ; start of next directory
        jmp     pathz_start

  pathz_not_path:
        cmp     al, '.'
        jne     pathz_not_ext
        lea     edi, [ebx+8]    ; start of extension
        jmp     pathz_new_char

  pathz_not_ext:
        cmp     al, 'a'
        jb      pathz_not_low
        cmp     al, 'z'
        ja      pathz_not_low
        sub     al, 0x20        ; char to uppercase

  pathz_not_low:
        mov     [edi], al
        inc     edi
        mov     eax, [esp+0]    ; start_of_dest_path
        add     eax, 512        ; keep maximum path under 512 bytes
        cmp     edi, eax
        jb      pathz_new_char

  pathz_end:
        cmp     ebx, edi        ; if path end with '/'
        jnz     pathz_put_zero  ; go back 1 level
        sub     ebx, 12

  pathz_put_zero:
        mov     byte [ebx+11], 0
        dec     ebx             ; include '/' char into file name
        pop     edi
        pop     ecx
        pop     eax
        ret

;*******************************************
;* string to number
;* input eax - 4 byte string
;* output eax - number
;*******************************************
StringToNumber:
;    <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>
;    <EFBFBD><EFBFBD><EFBFBD><EFBFBD>:
;        EDI - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>. <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 0Dh
;    <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:
;        CF - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:
;            0 - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>;
;            1 - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;        <EFBFBD><EFBFBD><EFBFBD><EFBFBD> CF=0, <EFBFBD><EFBFBD> AX - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>.

        push    bx
        push    cx
        push    dx
        push    edi
        mov     [partition_string], eax
        mov     edi, partition_string
        xor     cx, cx
i1:
        mov     al, [edi]
        cmp     al, 32;13
        je      i_exit
;    cmp    al,'0'
;    jb    err
;    cmp    al,'9'
;    ja    err
        sub     al, 48
        shl     cx, 1
        jc      error
        mov     bx, cx
        shl     cx, 1
        jc      error
        shl     cx, 1
        jc      error
        add     cx, bx
        jc      error
        cbw
        add     cx, ax
        jc      error
i3:
        inc     edi
        jmp     i1
i_exit:
        mov     ax, cx
        clc
i4:
        movzx   eax, ax
        pop     edi
        pop     dx
        pop     cx
        pop     bx
        ret

error:
        stc
        jmp     i4

partition_string:
                  dd 0
                  db 32