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score: Allow interrupts during thread dispatch

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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.
This commit is contained in:
Sebastian Huber
2016-11-11 14:37:51 +01:00
parent f9aa34ddd9
commit d5e073cde7
7 changed files with 50 additions and 57 deletions
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19
c/src/lib/libbsp/sparc/shared/irq_asm.S
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@@ -178,17 +178,22 @@ done_flushing:
mov %g4, %wim
#if defined(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.
*/
add %g6, PER_CPU_INTERRUPT_FRAME_AREA + CPU_INTERRUPT_FRAME_SIZE, %sp
st %g0, [%o0 + SPARC_CONTEXT_CONTROL_IS_EXECUTING_OFFSET]
! Try to update the is executing indicator of the heir context
mov 1, %g1
try_update_is_executing:
.Ltry_update_is_executing:
swap [%o1 + SPARC_CONTEXT_CONTROL_IS_EXECUTING_OFFSET], %g1
cmp %g1, 0
bne check_is_executing
bne .Lcheck_is_executing
! The next load is in a delay slot, which is all right
#endif
@@ -225,12 +230,12 @@ try_update_is_executing:
nop ! delay slot
#if defined(RTEMS_SMP)
check_is_executing:
.Lcheck_is_executing:
! Check the is executing indicator of the heir context
ld [%o1 + SPARC_CONTEXT_CONTROL_IS_EXECUTING_OFFSET], %g1
cmp %g1, 0
beq try_update_is_executing
beq .Ltry_update_is_executing
mov 1, %g1
! We may have a new heir
@@ -242,7 +247,7 @@ check_is_executing:
! Update the executing only if necessary to avoid cache line
! monopolization.
cmp %g2, %g4
beq try_update_is_executing
beq .Ltry_update_is_executing
mov 1, %g1
! Calculate the heir context pointer
@@ -252,7 +257,7 @@ check_is_executing:
! Update the executing
st %g4, [%g6 + PER_CPU_OFFSET_EXECUTING]
ba try_update_is_executing
ba .Ltry_update_is_executing
mov 1, %g1
#endif