222 lines
2.9 KiB
PHP
222 lines
2.9 KiB
PHP
;; File: stpdfs.inc
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STPDFS_BLOCK_SIZE = 512
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STPDFS_NAME_MAX = 28
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;; Struct: Inode
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struc Inode {
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.inode dw ?
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.nlink dw ?
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.uid dw ?
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.gid dw ?
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.flags dw ?
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.size dd ?
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.zones dd 10 dup(?)
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.actime dq ?
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.modtime dq ?
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}
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DEFN Inode
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STPDFS_INODE_PER_BLOCK equ STPDFS_BLOCK_SIZE / sizeof.Inode
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;; Struct: DirEntry
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struc DirEntry {
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.inum dd ?
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.name db STPDFS_NAME_MAX dup(?)
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}
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DEFN DirEntry
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;; Function: stpdfs_load_rootdir
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;;
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;; Out:
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;;
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stpdfs_load_rootdir:
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; read first inode
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mov ax, DISK_BUFFER/0x10
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mov es, ax
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mov ax, 2
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mov cx, 1
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xor bx, bx
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call disk_read_sectors
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; root dir is inode 1
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xor ax, ax
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mov es, ax
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mov ecx, sizeof.Inode
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mov esi, DISK_BUFFER + sizeof.Inode
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mov edi, inode_cache
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rep movsb
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mov ax, DISK_BUFFER/0x10
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mov es, ax
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xor bx, bx
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call stpdfs_copy_data
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ret
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;; Function: stpdfs_read_inode
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;;
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;; copy selected inode from file system to `inode_cache`
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;;
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;; In:
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;; EAX - inum
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;;
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stpdfs_read_inode:
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; get block where inode is located
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xor edx, edx
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mov ecx, STPDFS_INODE_PER_BLOCK
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div ecx
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add eax, 2
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; read block
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push edx
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push eax
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mov ax, DISK_BUFFER/0x10
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mov es, ax
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pop eax
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mov cx, 1
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xor bx, bx
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call disk_read_sectors
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pop edx
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; copy to inode cache
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mov eax, edx
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mov cl, sizeof.Inode
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mul cl
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movzx esi, ax
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add esi, DISK_BUFFER
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xor ax, ax
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mov es, ax
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mov ecx, sizeof.Inode
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mov edi, inode_cache
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rep movsb
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ret
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;; Function: stpdfs_search
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;;
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;; In:
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;; SI - filename
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;;
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;; Out:
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;; EAX - kernel inode
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stpdfs_search:
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clc ; clear carry flag
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xor ax, ax
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mov es, ax
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xor ecx, ecx
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.search_loop:
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cmp ecx, dword [inode_cache + Inode.size]
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jge .search_end
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push ecx
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; check if inum != 0
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mov eax, DISK_BUFFER
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add eax, ecx
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mov edx, [eax]
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or edx, edx
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jz .search_next
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; compare filename
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mov edi, eax
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add edi, 4
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push si
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.strcmp:
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mov al, [si]
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cmpsb
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jne .strcmp_not_equal
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or al, al
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jz .kernel_found
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jmp .strcmp
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.strcmp_not_equal:
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pop si
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.search_next:
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pop ecx
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add ecx, sizeof.DirEntry
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jmp .search_loop
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.search_end:
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stc
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ret
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.kernel_found:
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pop si
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pop ecx
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mov eax, edx
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clc
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ret
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;; Function: stpdfs_copy_data
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;;
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;; In:
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;; ES:BX - buffer
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;;
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stpdfs_copy_data:
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xor edx, edx
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movzx ebx, bx
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;; read direct
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@@:
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cmp ebx, dword [inode_cache + Inode.size]
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jg .all_read
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mov eax, edx
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shl eax, 2
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add eax, inode_cache + Inode.zones
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mov eax, [eax]
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push edx
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push ebx
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mov cx, 1
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call disk_read_sectors
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pop ebx
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pop edx
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add ebx, STPDFS_BLOCK_SIZE
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inc edx
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cmp edx, 7
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jb @b
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.indirect_read:
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push ebx
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mov ax, es
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push ax
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mov ax, DISK_BUFFER/0x10
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mov es, ax
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mov eax, dword [inode_cache + Inode.zones + 28]
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mov cx, 1
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xor bx, bx
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call disk_read_sectors
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pop ax
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mov es, ax
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pop ebx
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xor edx, edx
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@@:
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cmp ebx, dword [inode_cache + Inode.size]
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jg .all_read
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mov eax, edx
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shl eax, 2
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add eax, DISK_BUFFER
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mov eax, [eax]
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mov cx, 1
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push edx
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call disk_read_sectors
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pop edx
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add ebx, STPDFS_BLOCK_SIZE
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inc edx
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cmp edx, 128
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jbe @b
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.all_read:
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ret
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