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…ss spaces, and more Phase 1 - Userspace Improvements: - Enhanced ELF loader for true userspace process execution - Added user address space management (mm_struct, vm_area) - Implemented vmm_map_user_page() and vmm_map_user_range() - Created userspace media library header (user/lib/media.h) Phase 2 - Network Stack: - Implemented complete TCP state machine (SYN/SYN-ACK/ACK/FIN) - Added tcp_send_packet() for building and sending TCP segments - Added tcp_handle_segment() for processing incoming TCP - Implemented ARP request/reply handling - Added IP packet processing (ICMP, TCP, UDP dispatch) - Proper connection tracking with tcp_find_connection() Phase 3 - Hardware Improvements: - Rewrote Intel HDA driver with proper DMA ring buffers - Added 256KB ring buffer with 32 BDL entries - Implemented intel_hda_stop() and intel_hda_is_playing() - Added cache flush helpers for DMA coherency SMP Support: - Added spinlock implementation (spin_lock/spin_unlock) - Implemented smp_processor_id(), smp_num_cpus() - Added PSCI-based secondary CPU boot (smp_boot_secondary) - Added per-CPU GIC initialization (gic_cpu_init) - Added kernel-wide smp_lock()/smp_unlock() Syscall Improvements: - Implemented file descriptor table (MAX_FDS=256) - sys_openat now properly opens files via VFS - sys_read/sys_write now use FD table - sys_close properly releases file descriptors - sys_lseek implemented for file positioning - sys_execve now loads ELF binaries All changes maintain backwards compatibility with existing functionality.
Process Manager: - Added new dock icon replacing Settings with Process Manager - Process Manager window shows live list of running processes - Display includes PID, Name, State with color coding - Kill button for each process to terminate via process_kill() - Footer shows total processes and running count - Click handling for kill buttons with confirmation Multi-threading Support: - Added CLONE_* flags for pthread-compatible thread creation - Implemented create_thread() for spawning threads - Threads share memory space with parent (CLONE_VM) - Added get_task_by_pid() for task lookup - Added sched_kill_task() for graceful task termination - Updated clone syscall to use new threading infrastructure Process API Enhancements: - process_get_info() now returns actual PID instead of 1 - Added process_list() for bulk process enumeration - State names and colors for visual process status All features maintain backwards compatibility.
- Add Process Manager to applications list - Document multi-threading via clone() syscall with CLONE_VM - Document SMP infrastructure (boots on CPU 0) - Update architecture diagram with Process Manager and SMP - Mark completed roadmap items (multi-core, process manager, threading) - Update 'What Works' section with new features
Fix x86_64 build failure - smp_init was only defined for ARM64. Added stub implementation that prints initialization message.
sys_execve Implementation: - Set up user stack with argc/argv/envp pointers - Push strings and build pointer arrays on stack - Allocate mm_struct with code/data/stack/brk info - arch_enter_userspace() jumps to EL0/Ring3 via eret/iretq - ARM64: Sets up spsr_el1, elr_el1, sp_el0 for EL0 entry - x86_64: Builds IRETQ frame with proper CS/SS selectors EXT4 Write Support (Full Implementation): - ext4_write_block_raw: Write blocks to disk - ext4_write_inode: Update inode on disk - ext4_alloc_block: Allocate from block bitmap - ext4_free_block: Free block to bitmap - ext4_alloc_inode: Allocate from inode bitmap - ext4_free_inode: Free inode to bitmap - ext4_get_file_block: Support indirect blocks (single/double) - ext4_set_file_block: Set block mapping with allocation - ext4_add_dir_entry: Add entry to directory - ext4_write_file: Write data to file with block allocation - ext4_create_file: Create new file with directory entry - ext4_sync_superblock: Flush superblock to disk - Public VFS API: ext4_vfs_read/write/create/mkdir/truncate/sync/stat Infrastructure: - mm_struct: Added code/data/stack/brk/arg/env segment fields - types.h: Added atomic_set/read/inc/dec/dec_and_test helpers
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