gbos.git - gbos - a tiny Unix-flavored OS for the Game Boy Color (kernel, shell, coreutils in C, RAM filesystem)

	Commit message (Collapse)	Author	Age	Files	Lines
*	fs rewrite stage 2: inodes + root directory (block-based, persistent)	user	6 days	1	-53/+12
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	- fs.asm: a real block filesystem on the persistent block device - superblock, block/inode bitmaps, a 32-entry inode table (type, size, 8 direct block pointers -> files up to 2 KiB), and a root directory of 16-byte entries. Metadata cached in WRAMX; one-block data cache streams file/dir blocks. - same syscall interface (open/getb/putb/list/remove) -> tools unchanged; ls now enumerates until flist() runs out (16 files, was hardcoded 8). - old 8-slot WRAM FS removed; cart RAM partitioned: process banks 0-7, disk 8-11. - two register-clobber bugs fixed: alloc_block/alloc_inode returned the bitmap-block number (write_bitmap clobbers C); db_use loaded the wrong block on a transition (db_flush->write_block clobbers C) -> multi-block files broke. - verified: 10+ files, multi-block (300-byte) files, delete, and persistence across reboots. Debug 'blk' disk tool retained (fill/peek). - README: document the block filesystem.
*	fs rewrite stage 1: persistent block device (bounce buffer, cart SRAM)	user	6 days	1	-0/+161
	- blk.asm: read_block/write_block move 256-byte blocks between battery-backed cart-RAM banks (8-11, the 'disk') and a WRAM bounce buffer. Banking is hidden in those two routines; they inline the 'restore my bank' step so they never touch the stack while the disk bank is mapped over the process's $A000 window (the stack lives there too -- a call/ret would rug-pull it). - format-on-first-boot: superblock magic in block 0; otherwise the disk persists. - cart RAM bumped to 128 KiB (-r 4); process banks 0-7, disk banks 8-11. - debug tool 'blk fill/peek' + syscalls to validate round-trip and persistence. - verified: round-trip incl. cross-bank (block 100 -> bank 11); block survives a reboot via .sav; magic intact (no reformat on 2nd boot). - old WRAM 8-slot FS still backs the tools until stages 2-3.