2 Commits

Author	SHA1	Message	Date
AI	d1bf69ce0d	Add sysfs VFS driver, SYS_OPEN/CLOSE syscalls, cat app ... Sysfs: - New VFS driver mounted at /sys that lets kernel drivers expose virtual text files via namespace registration - Drivers call sysfs_register(name, ops, ctx) with list/read/write callbacks for their namespace - IDE driver registers 'ide' namespace exposing per-device attributes: model, type, channel, drive, sectors, sector_size - Tested: ls /sys -> ide, ls /sys/ide -> hdd1 cd1, cat /sys/ide/hdd1/model -> QEMU HARDDISK Syscalls: - Added SYS_OPEN (11) and SYS_CLOSE (12) for file I/O from userspace - Extended SYS_READ/SYS_WRITE to handle VFS file descriptors (fd >= 3) - Updated userspace syscalls.h with open()/close() wrappers Apps: - New 'cat' app: reads and displays file contents via open/read/close - Updated 'ls' to accept path argument via ARG1 env var - Updated shell to pass ARG1 env var to external commands	2026-02-23 14:26:52 +00:00
AI	e3d011da2f	Fix UTM display: remove required framebuffer tag, add serial output, ls app ... Display fixes for UTM/Mac black screen issue: - Remove MULTIBOOT_HEADER_TAG_FRAMEBUFFER from multiboot2 header (was required, requesting text mode depth=0 which confused GRUB on some platforms) - Add COM1 serial port (0x3F8) output alongside debugcon for UTM serial capture - Change VGA background from black to dark blue for diagnostics - Add early canary write to 0xB8000 ('COS' in magenta) before subsystem init - print_hex now outputs to both debugcon and COM1 New ls command and SYS_READDIR syscall: - SYS_READDIR (10): reads directory entries via VFS - VFS root listing: vfs_readdir handles '/' by iterating mount table - apps/ls: lists CWD contents, appends '/' for directories - apps/libc/syscalls.h: readdir() wrapper	2026-02-23 13:36:34 +00:00