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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-03-08 16:56:49 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-03-09 21:11:10 +0100 |
| commit | 32f0f11a68d3aa521f0398c9b8eec3d47f114c5e (patch) | |
| tree | 672d1bd028d0e8c625dbe75db318050528f7c4b4 /cpukit/score/cpu/arm/cpu_asm.S | |
| 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/cpu_asm.S')
| -rw-r--r-- | cpukit/score/cpu/arm/cpu_asm.S | 12 |
1 files changed, 12 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 */ |