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Changelog.md

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Changelog

  • 4.0.0
    • Added CoC, now new develpers to our welcoming community.
    • Added deterministic API to software timers.
    • Added NULL pointer checks to native lib functions.
    • Added extern "C" linkage for C++ projects.
    • Added ASSERT for future test reworks.
    • Added CortexTM-M7 port.
    • Reworked kernel and native lib namespaces.
    • Reworked comment style.
    • Decoupled scheduler from interrupt virtualization layer.
    • Reworked scheduler code.
    • Reworked power saving. Now it's done in kernel mode only
    • Fixed API for BGRT_KBLOCK_HPFIC_HOOK macro.
    • Fixed #37 (kernel timer rollover problem).
    • Ported tests to newer libopencm3 version.
    • Deleted signals from native lib.
    • Deleted unneeded files.
    • Updated documentation.
  • 3.0.0
    • API renamed to clarify its usage.
    • Optimized performance(see #32.#33,#34).
      • Added atomic notifications mechanism.
      • Added bgrt_map_search using CLZ on CortexTM-M3,4F.
      • Reworked sem_free, now it is done in FSM in kernel thread.
      • Made BGRT_ISR preemptive on on CortexTM-M3,4F.
    • Added owner feature to native lib semaphores.
    • Fixed #30, now the kernel is more robust to user lib errors.
    • Fixed #31 (logical mistake in native lib semaphore implementation).
    • Reworked virtual interrupt controller, fixed #34 (virtual interrupt leak).
    • Added common files to arch dir.
  • 2.0.0
    • Reworked system call dispatcher. X_MACRO is used to generate boilerplate code thus enabling kernel extensions and size optimizations.
    • Reworked kernel API.
    • Updated native lib and getting started guide.
    • The project code has been checked with Adlint and annotated.
    • Added STM8/SDCC port.
    • Fixed #20.
    • Fixed #26.
  • 1.0.0
    • Deleted IDLE process and user code execution after start (Oh boy! How do I add CMSIS-RTOS API after this???).
    • Added interrupt virtualization layer.
    • Added kernel thread for system calls and virtual interrupts processing.
    • Added userspace process data for future use in b4-microkernel.
    • Reworked scheduler code to simplify it and to use it in virtual interrupts.
    • Reworked system call dispatcher code.
    • Reworked cyclic system calls to use kernel thread virtual interrupt processing loop instead of user space loops.
    • Modified low level arch-dependent code for new kernel.
  • 0.9.9
    • Tests and arch filesystem structure made standardized;
    • Added BUGURT_INTERRUPT macros to CortexTM-Mx ports;
    • Added docs to main tree;
    • Name space changes:
      • Added BGRT_ and bgrt_ prefixes to avoid naming conflicts in future;
      • Deleted _isr/_ISR postfixes;
      • Cleaned up namespace;
    • Enabled user code execution after bgrt_start (by not calling of bgrt_idle_main in bgrt_start) as config option;
    • System call dispatcher changes:
      • Made system call dispatcher replaceable;
      • Made system call handlers typed;
      • Fixed user system call arg type (union instead of struct);
    • Process control changes:
      • Added BGRT_PID_T for process identification in process context, bgrt_proc_t pointers are used in kernel context;
      • Added BGRT_PID_TO_PROC, BGRT_PROC_TO_PID, BGRT_PID_NOTHING macros;
      • Added BGRT_SYSCALL_PROC_GET_PRIO, BGRT_SYSCALL_PROC_GET_ID syscalls and correspondent caller functions;
      • Removed dead some code;
    • Synchronization control changes:
      • Deleted SYSCALL_WAKE_AND_SLEEP SYSCALL_WAKE_AND_WAIT syscalls;
      • Added BGRT_SYSCALL_SYNC_GET_OWNER syscall;
      • Added snum (number of sleeping processes) field to bgrt_sync_t;
      • Revised asynchronous wakeup protocol (various changes and fixes);
      • Revised synchronization API due to previous changes;
      • Fixed priority inversion (#14);
      • Upgraded tests.
    • Native lib changes:
      • Added native.h to native lib;
      • Upgraded native lib.
  • 0.6.6, 0.7.3
    • Ported CortexTM-Mx tests to libopencm3.
    • Backported vsmp from 0.8.4
  • 0.8.4
    • Fixed design issues in basic synchronization primitive:
      • added asynchronous wakes;
      • deleted sync_clear_owner function;
      • added sync_own and sync_touch functions;
      • changed sync_set_owner behavior.
      • reworked sync tests.
    • Fixed race condition in vsmp (see #12).
    • Reworked generic lib:
      • updated generic lib code to use new kernel version;
      • added sem_free_isr function.
  • 0.8.3
    • Merged spelling correction from dartraiden.
    • Added argument checks to proc.c.
    • Added status_t, statuses are global now.
    • Ported CortexTM-Mx tests to libopencm3.
    • Fixed several bugs in VSMP port.
    • Revised tests.
    • Fixed stupid mistakes in sync test.
    • Kernel is supposed to stabilize now. Development will be focused on libs, ports and bug fixes since this release.
  • 0.8.2
    • Added cnt_lock to proc_t, renamed PROC_FLG_BLOCK to PROC_FLG_LOCK, PROC_FLG_LOCK behavior is now independent from proc->lres.
    • Added FIFO scheduler policy and PROC_FLG_RR to switch to Round Robin sched policy (default).
    • Removed unused functions.
    • Removed PROC_PRE_STOP flag processing in sync.c.
    • Added timeout support to kernel.
    • Fixed PROC_SET_STATE macro.
    • Fixed wrong sync owner handling order.
    • Added -Os flag to CM0, CM3, CM4F, AVR test projects.
    • Fixed obsolete scheduler code.
  • 0.8.1
    • Fixed old scheduler code.
    • Fixed missed wakeup in sync_wait call.
    • Added memory barriers in CortexTM-M ports.
    • Deleted proc_flag_stop system call.
    • Added proc_lock and proc_free system calls.
    • Changed sync_set_owner system call behavior. Now sync_clear_owner call needed to change owner.
    • Added support of Immediate Ceiling Priority Protocol, now priority control protocol combines both ICPP and BPI.
    • Added generic lib, which supports some traditional sync primitives:
      • mutex;
      • conditional variable;
      • signal (like in 0.6.x and 0.7.x branches);
      • counting semaphore;
      • microkernel style IPC.
  • 0.7.2
  • 0.6.5
  • 0.8.0
    • New branch added, see differences with 0.6.x and 0.7.x branches.
  • 0.7.1
    • Several priority inheritance protocol bugs fixed.
  • 0.7.0
    • Priority inheritance protocol implemented, no more ICPP in 0.7.x branch.
    • Mutex test updated.
  • 0.6.4
    • CortexTM-M4F support added.
    • Tests moved from lpc1xxx to stm32xxxx.
  • 0.6.3
    • CortexTM-M0 support added.
  • 0.6.2
    • CortexTM-M3 support added.
  • 0.6.1
    • Fixed proc_restart/proc_restart_isr bug, no more restart with locked mutexes or semaphores
    • Added scheduler dead spinlock if process lists are empty.
  • 0.6.0
    • pmain return sequence has been revised:
      • no more proc_wrapper function,
      • proc_terminate function has been added,
      • proc terminate system call has been changed,
      • proc_stack_init function has been changed in order to add return address (a pointer to proc_terminate function actually) to initial process context.
  • 0.5.2
    • Low level race condition fixed.
    • Stm8/raisonance tests improved (all paths a relative now).
    • Interrupt driven syscalls on AVR have been removed.
  • 0.5.1
    • Serious signal wait prologue bug fixed!
    • Stm8/raisonance port added.
  • 0.5.0
    • Kernel is now preemptive!
    • Kernel API is frozen.
    • Cross-platform test suite has been added.
    • Some bugs fixed.
    • Documentation has been updated.
  • 0.4.0
    • Simple IPC added.
    • Spinlock wrapper macros added to simplify the source code.
    • Some bugs fixed.
    • Code::Blocks BuguRTOS wizard for AVR updated.
  • 0.3.7
    • sem_try_lock added.
    • More code cleanup is done.