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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-11-11 14:37:51 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-11-18 07:30:34 +0100 |
| commit | d5e073cde70211b2471e4366be397370e9f6ce48 (patch) | |
| tree | 7ee1e3cad3dd7dfbb52475af7bacc61b216dc0e5 /cpukit/score/cpu/arm/cpu_asm.S | |
| parent | score: Add Per_CPU_Control::Interrupt_frame (diff) | |
| download | rtems-d5e073cde70211b2471e4366be397370e9f6ce48.tar.bz2 | |
score: Allow interrupts during thread dispatch
Use a processor-specific interrupt frame during context switches in case
the executing thread is longer executes on the processor and the heir
thread is about to start execution. During this period we must not use
a thread stack for interrupt processing.
Update #2809.
Diffstat (limited to 'cpukit/score/cpu/arm/cpu_asm.S')
| -rw-r--r-- | cpukit/score/cpu/arm/cpu_asm.S | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/cpukit/score/cpu/arm/cpu_asm.S b/cpukit/score/cpu/arm/cpu_asm.S index cf94822eaf..1ad3a51b14 100644 --- a/cpukit/score/cpu/arm/cpu_asm.S +++ b/cpukit/score/cpu/arm/cpu_asm.S @@ -69,8 +69,14 @@ DEFINE_FUNCTION_ARM(_CPU_Context_switch) #endif #ifdef RTEMS_SMP - /* The executing context no longer executes on this processor */ + /* + * The executing thread no longer executes on this processor. Switch + * the stack to the temporary interrupt stack of this processor. Mark + * the context of the executing thread as not executing. + */ dmb + GET_SELF_CPU_CONTROL r2 + add sp, r2, #(PER_CPU_INTERRUPT_FRAME_AREA + CPU_INTERRUPT_FRAME_SIZE) mov r3, #0 strb r3, [r0, #ARM_CONTEXT_CONTROL_IS_EXECUTING_OFFSET] @@ -128,8 +134,6 @@ DEFINE_FUNCTION_ARM(_CPU_Context_restore) #ifdef RTEMS_SMP .L_get_potential_new_heir: - GET_SELF_CPU_CONTROL r2 - /* We may have a new heir */ /* Read the executing and heir */ |