103 lines
2.5 KiB
PHP
103 lines
2.5 KiB
PHP
;; File: xv6fs.inc
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;;
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;; Usefull links:
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;; - <https://github.com/mit-pdos/xv6-riscv/blob/riscv/kernel/fs.h>
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;; - <xv6 book at https://pdos.csail.mit.edu/6.1810/2023/xv6/book-riscv-rev3.pdf>
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;;
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;; Section: xv6 Filesystem
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;;
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;; > ┌──────────┬───────────┬───┬───┬───┬──────┬───┬──────┬──────┬───┬──────┬────┬───┬────┐
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;; > │Boot block│Super block│Log│...│Log│Inodes│...│Inodes│Bitmap│...│Bitmap│Data│...│Data│
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;; > └──────────┴───────────┴───┴───┴───┴──────┴───┴──────┴──────┴───┴──────┴────┴───┴────┘
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;;
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;; Constant: XV6FS_BSIZE
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;; xv6 Filesystem block size (1024)
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XV6FS_BSIZE = 1024
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;; Constant: XV6FS_ROOTINO
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;; root inode number
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XV6FS_ROOTINO = 1
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;; Constant: XV6FS_MAGIC
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;; Superblock magic number, MUST BE `0x10203040`
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XV6FS_MAGIC = 0x10203040
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;; Constant: XV6FS_NDIRECT
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;; Number of direct block (12)
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XV6FS_NDIRECT = 12
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XV6FS_NINDIRECT = (XV6FS_BSIZE / 4)
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XV6FS_MAXFILE = (XV6FS_NDIRECT + XV6FS_NINDIRECT)
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XV6FS_IPB = (XV6FS_BSIZE / 64)
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XV6FS_DIRSIZE = 14
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;; Struc: Xv6FS_Sb
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;; xv6FS superblock
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;;
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;; .magic - See <XV6FS_MAGIC>
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;; .size - TODO
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;; .nblock - TODO
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;; .ninodes - TODO
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;; .nlog - TODO
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;; .nlogstart - TODO
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;; .inodestart - TODO
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;; .bmapstart - TODO
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struc Xv6FS_Sb {
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.magic dd ?
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.size dd ?
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.nblock dd ?
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.ninodes dd ?
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.nlog dd ?
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.nlogstart dd ?
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.inodestart dd ?
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.bmapstart dd ?
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}
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DEFN Xv6FS_Sb
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;; Struc: Xv6FS_Inode
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;; xv6FS on disk i-node
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;;
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;; .type - TODO
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;; .major - TODO
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;; .minor - TODO
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;; .nlink - TODO
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;; .size - TODO
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;; .addrs - TODO
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struc Xv6FS_Inode {
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.type dw ?
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.major dw ?
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.minor dw ?
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.nlink dw ?
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.size dd ?
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.addrs dd (XV6FS_NDIRECT + 1) dup(?)
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}
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DEFN Xv6FS_Inode
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;; Struc: Xv6FS_Dirent
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;; xv6FS directory entry
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;;
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;; .inum - inode number
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;; .name - see <XV6FS_DIRSIZE>
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struc Xv6FS_Dirent {
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.inum dw ?
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.name db XV6FS_DIRSIZE dup(?)
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}
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; ------------------------------------------------------------------------
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;; Section: Implementation
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szVfsXv6FSName db 'xv6FS', 0
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vops_xv6fs:
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dd 0
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vfs_xv6fs:
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dd szVfsXv6FSName
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dd 0
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dd vops_xv6fs
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xv6fs_init:
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mov eax, vfs_xv6fs
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call vfs_register
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ret
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