From 4f2d40ca35e0e39886dc881d06256fc25ba27a77 Mon Sep 17 00:00:00 2001 From: user Date: Thu, 16 Jul 2026 12:20:57 +0200 Subject: fs rewrite stage 2: inodes + root directory (block-based, persistent) - 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. --- c/libc.s | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'c/libc.s') diff --git a/c/libc.s b/c/libc.s index 5b81dca..c245bbd 100644 --- a/c/libc.s +++ b/c/libc.s @@ -200,7 +200,7 @@ _reap: rst #0x30 ret - .globl _bfill, _bpeek + .globl _bfill, _bpeek, _bpeek2 ;; void bfill(unsigned char block /*A*/, unsigned char byte /*E*/) _bfill: ld b, a @@ -210,6 +210,14 @@ _bfill: ;; unsigned char bpeek(unsigned char block /*A*/) -> A _bpeek: ld b, a + ld e, #0 ld c, #24 ; SYS_BPEEK rst #0x30 ret + ;; unsigned char bpeek2(unsigned char block /*A*/, unsigned char off /*E*/) -> A +_bpeek2: + ld b, a + ld c, #24 ; SYS_BPEEK (off already in E) + rst #0x30 + ret + -- cgit v1.3.1-sl0p