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Smaller vector tables: Add irq_mapped_t.

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Gregory Nutt
2017-03-03 10:20:40 -06:00
parent 04c9ccdd2d
commit e1218c4b4b
4 changed files with 49 additions and 12 deletions
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arch/Kconfig
+7 -7
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@@ -636,19 +636,19 @@ config ARCH_MINIMAL_VECTORTABLE
provides:
#include <nuttx/arch.h>
const irq_t g_irqmap[NR_IRQS] =
const irq_mapped_t g_irqmap[NR_IRQS] =
{
... IRQ to index mapping values ...
};
This table is index by the hardware IRQ number and provides a value
in the range of 0 to CONFIG_ARCH_NUSER_INTERRUPTS that the new,
in the range of 0 to CONFIG_ARCH_NUSER_INTERRUPTS that is the new,
mapped index into the vector table. Unused, unmapped interrupts
should be set to (irq_t)-1. So, for example, if g_irqmap[37] == 24,
Then the hardware interrupt vector 37 will be mapped to the interrupt
vector table at index 24. if g_irqmap[42] == (irq_t)-1, then hardware
interrupt vector 42 is not used and if it occurs will result in an
unexpected interrupt crash.
should be set to (irq_mapped_t)-1. So, for example, if g_irqmap[37]
== 24, then the hardware interrupt vector 37 will be mapped to the
interrupt vector table at index 24. if g_irqmap[42] ==
(irq_mapped_t)-1, then hardware interrupt vector 42 is not used and
if it occurs will result in an unexpected interrupt crash.
config ARCH_NUSER_INTERRUPTS
int "Number of interrupts"