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Finishes coding of ARMv7-M high priority nested interrupt logic. Still undocumented; still not fully tested

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Gregory Nutt
2013-12-21 15:05:48 -06:00
parent 3855ce04e8
commit eaed4c04a2
7 changed files with 345 additions and 33 deletions
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arch/Kconfig
+17
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@@ -281,6 +281,23 @@ config ARCH_HIPRI_INTERRUPT
int up_prioritize_irq(int irq, int priority)
NOTE: ARCH_INTERRUPTSTACK must be set in kernel mode (NUTTX_KERNEL).
In kernel mode without an interrupt stack, the interrupt handler
will set the MSP to the stack pointer of the interrupted thread. If
the interrupted thread was a privileged thread, that will be the MSP
otherwise it will be the PSP. If the PSP is used, then the value of
the MSP will be invalid when the interrupt handler returns because
it will be a pointer to an old position in the unprivileged stack.
Then when the high priority interrupt occurs and uses this stale MSP,
there will most likely be a system failure.
If the interrupt stack is selected, on the other hand, then the
interrupt handler will always set the the MSP to the interrupt
stack. So when the high priority interrupt occurs, it will either
use the MSP of the last privileged thread to run or, in the case of
the nested interrupt, the interrupt stack if no privileged task has
run
config ARCH_INT_DISABLEALL
bool "Disable high priority interrupts"
default y