Appendix B01-B03 in series of writing os in cpp #37
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Appendix B01) Disecting MBR(master boot record) alongwith partition table written by fdisk from TinyCoreOS ++ create 2 parition via fdisk in virtual hardisk using TinyCoreOS then in wyoos using ata driver gather info about MBR and Parition Table
Appendix B02) Implemented Fat32 filesystem ++ Using partitionOffset accessed 1st sector of partition which is known as BiosParameterBlock / VolumeID. bpb helps find location of FAT table, data, root directory cluster, etc From rootCluster we get access to DirectoryEntries which holds location of file data if dirent[i].attributes & 0x10 != 0x10
Appendix B03) Added functionality to Read all sector/cluster belonging to file:-
++ using tinyCoreOs create 8kb bile that span over multiple sector and cluster
++ Using 1st rootCluster we are able to reach 1st cluster of file data then
i) Get next cluster belonging to file from FAT table
ii) Get next sector belonging to file from current file cluster
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a35756d [FAT32 extended] In series of writing os in cpp:- Appendix B03) Added functionality to Read all sector/cluster belonging to file:-
bec5bbd [FAT32 fs] In series of writing os in cpp:- Appendix B02) Implemented Fat32 filesystem
aff3c38 [MBR] In series of writing os in cpp:- Appendix B01) Disecting MBR(master boot record) alongwith partition table written by fdisk from TinyCoreOS
for reference check my repo https://github.com/ssagar-linux/ssagarWyoos