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bsps/i386: SMP and per-CPU thread dispatch disable

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Interrupt support for SMP and the per-CPU thread dispatch disable level.
This commit is contained in:
Sebastian Huber
2013-08-02 16:28:23 +02:00
parent 55b1aee441
commit 4e3b7e26a2
1 changed files with 10 additions and 3 deletions
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13
c/src/lib/libbsp/i386/shared/irq/irq_asm.S
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@@ -144,7 +144,14 @@ ISR_STOP:
.check_stack_switch:
movl esp, ebp /* ebp = previous stack pointer */
#ifdef RTEMS_SMP
call SYM(_CPU_SMP_Get_current_processor)
sall $PER_CPU_CONTROL_SIZE_LOG2, eax
addl $SYM(_Per_CPU_Information), eax
movl eax, ebx
#else
movl $SYM(_Per_CPU_Information), ebx
#endif
/* is this the outermost interrupt? */
cmpl $0, PER_CPU_ISR_NEST_LEVEL(ebx)
@@ -159,8 +166,8 @@ ISR_STOP:
nested:
incl PER_CPU_ISR_NEST_LEVEL(ebx) /* one nest level deeper */
incl SYM (_Thread_Dispatch_disable_level) /* disable multitasking */
incl PER_CPU_THREAD_DISPATCH_DISABLE_LEVEL(ebx) /* disable
multitasking */
/*
* GCC versions starting with 4.3 no longer place the cld
* instruction before string operations. We need to ensure
@@ -215,7 +222,7 @@ nested:
/* If interrupts are nested, */
/* then dispatching is disabled */
decl SYM (_Thread_Dispatch_disable_level)
decl PER_CPU_THREAD_DISPATCH_DISABLE_LEVEL(ebx)
/* unnest multitasking */
/* Is dispatch disabled */
jne .exit /* Yes, then exit */