2 Commits

Author	SHA1	Message	Date
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
AI	c25ba1fccd	feat: shell (sh) with keyboard driver, SYS_READ, SYS_EXEC ... - PS/2 keyboard driver: IRQ1 handler, scancode set 1 translation, ring buffer, shift key support - SYS_READ (fd=0): non-blocking keyboard read for stdin - SYS_YIELD: calls schedule_tick directly (no nested INT 0x80) - SYS_EXEC: loads binary from CPIO initrd, replaces process image - User-space libc: crt0.S (C runtime startup), syscalls.h (inline syscall wrappers, basic string functions) - Shell app (sh): readline with echo/backspace, builtins (cd, env, help, exit), fork+exec for external commands - Updated build_apps.sh: C app support with crt0 linking, libc include path, .bss section in objcopy Tested: shell boots, keyboard input works, hello-world runs via fork+exec, env shows CWD, exit cleanly terminates.	2026-02-23 13:08:06 +00:00