diff options
Diffstat (limited to 'ports/xtensa/xcc/src/tx_thread_schedule.S')
| -rw-r--r-- | ports/xtensa/xcc/src/tx_thread_schedule.S | 70 |
1 files changed, 36 insertions, 34 deletions
diff --git a/ports/xtensa/xcc/src/tx_thread_schedule.S b/ports/xtensa/xcc/src/tx_thread_schedule.S index 287c3530..e4b9502e 100644 --- a/ports/xtensa/xcc/src/tx_thread_schedule.S +++ b/ports/xtensa/xcc/src/tx_thread_schedule.S @@ -34,8 +34,8 @@ /**************************************************************************/ /**************************************************************************/ -/** */ -/** ThreadX Component */ +/** */ +/** ThreadX Component */ /** */ /** Thread */ /** */ @@ -49,21 +49,23 @@ .text -/**************************************************************************/ -/* */ -/* DESCRIPTION */ -/* */ -/* This function waits for a thread control block pointer to appear in */ -/* the _tx_thread_execute_ptr variable. Once a thread pointer appears */ -/* in the variable, the corresponding thread is resumed. */ -/* */ -/* RELEASE HISTORY */ -/* */ -/* DATE NAME DESCRIPTION */ -/* */ -/* 12-31-2020 Cadence Design Systems Initial Version 6.1.3 */ -/* */ -/**************************************************************************/ +/**************************************************************************/ +/* */ +/* DESCRIPTION */ +/* */ +/* This function waits for a thread control block pointer to appear in */ +/* the _tx_thread_execute_ptr variable. Once a thread pointer appears */ +/* in the variable, the corresponding thread is resumed. */ +/* */ +/* RELEASE HISTORY */ +/* */ +/* DATE NAME DESCRIPTION */ +/* */ +/* 12-31-2020 Cadence Design Systems Initial Version 6.1.3 */ +/* 10-31-2022 Scott Larson Updated EPK definitions, */ +/* resulting in version 6.2.0 */ +/* */ +/**************************************************************************/ // VOID _tx_thread_schedule(VOID) // { @@ -96,8 +98,8 @@ _tx_thread_schedule: Note on Windowed ABI: Callers of this don't expect it to return to them. Most use 'call0'. The only windowed (C) caller is _tx_initialize_kernel_enter(). - There are no args or results to pass. So we don't really care if the - window gets rotated. We can omit the 'entry' altogether and avoid the + There are no args or results to pass. So we don't really care if the + window gets rotated. We can omit the 'entry' altogether and avoid the need for a special "no entry" entrypoint to this function. */ @@ -108,11 +110,11 @@ _tx_thread_schedule: call0 scheduler_return #endif - /* + /* Wait for a thread to execute (Idle Loop). - First ensure interrupts (except hi-pri) are disabled so result + First ensure interrupts (except hi-pri) are disabled so result of reading _tx_thread_execute_ptr can't change before testing. - While there's no thread ready, enable interrupts and wait in a + While there's no thread ready, enable interrupts and wait in a low power state, then disable interrupts and repeat the test. */ // do @@ -130,7 +132,7 @@ _tx_thread_schedule: // while(_tx_thread_execute_ptr == TX_NULL); .L_tx_thread_schedule_ready: - + /* Yes! We have a thread to execute. Lockout interrupts and transfer control to it. Interrupts are already disabled. */ @@ -170,7 +172,7 @@ _tx_thread_schedule: // SP = _tx_thread_execute_ptr -> tx_thread_stack_ptr; l32i sp, a2, tx_thread_stack_ptr - #ifdef TX_ENABLE_EXECUTION_CHANGE_NOTIFY + #if (defined(TX_ENABLE_EXECUTION_CHANGE_NOTIFY) || defined(TX_EXECUTION_PROFILE_ENABLE)) /* Call the thread entry function to indicate the thread is executing. */ #ifdef __XTENSA_CALL0_ABI__ call0 _tx_execution_thread_enter @@ -197,8 +199,8 @@ _tx_thread_schedule: /* In Call0 ABI, restore callee-saved regs (A12, A13 already restored). */ #ifdef __XTENSA_CALL0_ABI__ - l32i a14, sp, XT_STK_A14 - l32i a15, sp, XT_STK_A15 + l32i a14, sp, XT_STK_A14 + l32i a15, sp, XT_STK_A15 #endif #if XCHAL_CP_NUM > 0 @@ -207,25 +209,25 @@ _tx_thread_schedule: /* This does not return to its caller, but to the selected thread. - Must return via the exit dispatcher corresponding to the entrypoint - from which this was called. Interruptee's A0, A1, PS, PC are restored + Must return via the exit dispatcher corresponding to the entrypoint + from which this was called. Interruptee's A0, A1, PS, PC are restored and the interrupt stack frame is deallocated in the exit dispatcher. */ - l32i a0, sp, XT_STK_EXIT + l32i a0, sp, XT_STK_EXIT ret .L_tx_thread_synch_return: /* Here we return from a solicited entry with a solicited stack frame. */ movi a0, TX_FALSE - l32i a3, sp, XT_STK_PS + l32i a3, sp, XT_STK_PS s32i a0, a2, tx_thread_solicited #ifdef __XTENSA_CALL0_ABI__ - l32i a12, sp, XT_STK_A12 - l32i a13, sp, XT_STK_A13 - l32i a14, sp, XT_STK_A14 - l32i a15, sp, XT_STK_A15 + l32i a12, sp, XT_STK_A12 + l32i a13, sp, XT_STK_A13 + l32i a14, sp, XT_STK_A14 + l32i a15, sp, XT_STK_A15 #endif l32i a0, sp, XT_STK_PC /* return address */ |