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Rev 129 Rev 133
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file_system:
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file_system:
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; IN:
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; IN:
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;
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;
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; eax = 0  ; read file          /RamDisk/First  6   /HardDisk/First 30
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; eax = 0  ; read file          /RamDisk/First  6
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; eax = 1  ; write file         /RamDisk/First 33   /HardDisk/First 56
 - 
 
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; eax = 2  ; delete file        /RamDisk/First 32   /HardDisk/First 57
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; eax = 1  ; write file         /RamDisk/First 33   /HardDisk/First 56
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; eax = 3  ; append to a file   /RamDisk/First ??   /HardDisk/First ??
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; eax = 2  ; delete file        /RamDisk/First 32
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; eax = 4  ; makedir
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; eax = 4  ; makedir
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; eax = 5  ; rename file/directory
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; eax = 5  ; rename file/directory
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; eax = 8  ; lba read
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; eax = 8  ; lba read
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    cmp   dword [0x3000],1      ; no memory checks for kernel requests
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    cmp   dword [0x3000],1      ; no memory checks for kernel requests
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    jz    no_checks_for_kernel
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    jz    no_checks_for_kernel
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    mov   edx,eax
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    mov   edx,eax
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    cmp   dword [eax+0],1
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    jz    .check_for_write_op
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    cmp   dword [eax+0],3
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    cmp   dword [eax+0],1
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    jnz   .usual_check
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.check_for_write_op:
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    jnz   .usual_check
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    mov   ebx,[eax+12]
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    mov   ebx,[eax+12]
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    add   ebx,std_application_base_address
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    add   ebx,std_application_base_address
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    mov   ecx,[eax+8]
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    mov   ecx,[eax+8]
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    call  check_region
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    call  check_region
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    jz    .error_output
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    jz    .error_output
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  area_in_app_mem:
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  area_in_app_mem:
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    mov   eax,edx
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    mov   eax,edx
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  no_checks_for_kernel:
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  no_checks_for_kernel:
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    cmp   dword [eax+0],3       ; APPEND - allow write 0 bytes (truncate)
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    je    fs_read
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    cmp   dword [eax+8],0       ; read or write 0 blocks/bytes ?
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    jne   fs_read
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    and   dword [esp+36],0
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    ret
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  fs_read:
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  fs_read:
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    mov   ebx,[eax+20]          ; program wants root directory ?
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    mov   ebx,[eax+20]          ; program wants root directory ?
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    jmp   file_system_return
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    jmp   file_system_return
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  fs_noharddisk_delete:
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    cmp   dword [esp+20],3      ; APPEND
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    jne   fs_noharddisk_append
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    mov   eax,[esp+0]           ; /dirname or /filename
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    mov   byte [eax],0          ; path to asciiz
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    inc   eax                   ; filename start
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    mov   edx,[esp+4]
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    add   edx,12*2              ; path start
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    mov   ecx,[esp+8]           ; buffer
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    mov   ebx,[esp+12]          ; count to write
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    mov   esi,[esp+16]          ; bytes to skip over
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    call  file_append
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    mov   edi,[esp+0]
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    mov   byte [edi],'/'
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    jmp   file_system_return
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  fs_noharddisk_append:
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  fs_noharddisk_delete:
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    cmp   dword [esp+20],4      ; MAKEDIR
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    cmp   dword [esp+20],4      ; MAKEDIR