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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-03-08 16:56:49 +0100 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-03-09 21:11:10 +0100 |
commit | 32f0f11a68d3aa521f0398c9b8eec3d47f114c5e (patch) | |
tree | 672d1bd028d0e8c625dbe75db318050528f7c4b4 /cpukit/score/cpu/arm | |
parent | bsp/altera-cyclone-v: fix the creation of reserved memory regions (diff) | |
download | rtems-32f0f11a68d3aa521f0398c9b8eec3d47f114c5e.tar.bz2 |
SMP: Fix start multitasking for some targets
The previous SMP multitasking start assumed that the initial heir thread of a
processor starts execution in _Thread_Handler(). The _Thread_Handler() sets
the interrupt state explicitly by _ISR_Set_level() before it calls the thread
entry. Under certain timing conditions, processors may perform an initial
context switch to a thread which already executes its thread body (see
smptests/smpstart01). In this case, interrupts are disabled after the context
switch on targets which do not save/restore the interrupt state during a
context switch (aarch64, arm, and riscv).
Close #4627.
Diffstat (limited to 'cpukit/score/cpu/arm')
-rw-r--r-- | cpukit/score/cpu/arm/cpu_asm.S | 12 | ||||
-rw-r--r-- | cpukit/score/cpu/arm/include/rtems/score/cpu.h | 4 |
2 files changed, 16 insertions, 0 deletions
diff --git a/cpukit/score/cpu/arm/cpu_asm.S b/cpukit/score/cpu/arm/cpu_asm.S index 54d6f70b0d..d52a43f70d 100644 --- a/cpukit/score/cpu/arm/cpu_asm.S +++ b/cpukit/score/cpu/arm/cpu_asm.S @@ -182,6 +182,18 @@ DEFINE_FUNCTION_ARM(_CPU_Context_restore) str r5, [r2, #PER_CPU_OFFSET_EXECUTING] b .L_check_is_executing + +DEFINE_FUNCTION_ARM(_ARM_Start_multitasking) + mov r1, r0 + GET_SELF_CPU_CONTROL r2 + + /* Switch the stack to the temporary interrupt stack of this processor */ + add sp, r2, #(PER_CPU_INTERRUPT_FRAME_AREA + CPU_INTERRUPT_FRAME_SIZE) + + /* Enable IRQ interrupts */ + cpsie i + + b .L_check_is_executing #endif #endif /* ARM_MULTILIB_ARCH_V4 */ diff --git a/cpukit/score/cpu/arm/include/rtems/score/cpu.h b/cpukit/score/cpu/arm/include/rtems/score/cpu.h index da521528a4..7ac180ac26 100644 --- a/cpukit/score/cpu/arm/include/rtems/score/cpu.h +++ b/cpukit/score/cpu/arm/include/rtems/score/cpu.h @@ -443,6 +443,10 @@ void _CPU_Context_Initialize( { context->is_executing = is_executing; } + + RTEMS_NO_RETURN void _ARM_Start_multitasking( Context_Control *heir ); + + #define _CPU_Start_multitasking( _heir ) _ARM_Start_multitasking( _heir ) #endif #define _CPU_Context_Restart_self( _the_context ) \ |