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nios2: add static interrupt handling code

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Supports Internal Interrupt Controller only for now; EIC
supoort tracked in ZEP-258.

Change-Id: I2d9c5180e61c06b377fce4bda8a59042b68d58f2
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2016-06-21 12:18:50 -07:00 • committed by Inaky Perez-Gonzalez
commit 738dec483e
8 changed files with 159 additions and 6 deletions
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41
include/arch/nios2/arch.h
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@ -43,9 +43,46 @@ extern "C" {
#ifndef _ASMLANGUAGE
#include <stdint.h>
#include <irq.h>
#include <sw_isr_table.h>
/* STUB. Eventually port ARC/ARM interrupt stuff */
#define _ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p)
/**
* Configure a static interrupt.
*
* All arguments must be computable by the compiler at build time; if this
* can't be done use irq_connect_dynamic() instead.
*
* Internally this function does a few things:
*
* 1. The enum statement has no effect but forces the compiler to only
* accept constant values for the irq_p parameter, very important as the
* numerical IRQ line is used to create a named section.
*
* 2. An instance of _IsrTableEntry is created containing the ISR and its
* parameter. If you look at how _sw_isr_table is created, each entry in the
* array is in its own section named by the IRQ line number. What we are doing
* here is to override one of the default entries (which points to the
* spurious IRQ handler) with what was supplied here.
*
* There is no notion of priority with the Nios II internal interrupt
* controller and no flags are currently supported.
*
* @param irq_p IRQ line number
* @param priority_p Interrupt priority (ignored)
* @param isr_p Interrupt service routine
* @param isr_param_p ISR parameter
* @param flags_p IRQ triggering options (currently unused)
*
* @return The vector assigned to this interrupt
*/
#define _ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p) \
({ \
enum { IRQ = irq_p }; \
static struct _IsrTableEntry _CONCAT(_isr_irq, irq_p) \
__attribute__ ((used)) \
__attribute__ ((section(STRINGIFY(_CONCAT(.gnu.linkonce.isr_irq, irq_p))))) = \
{isr_param_p, isr_p}; \
irq_p; \
})
static ALWAYS_INLINE unsigned int _arch_irq_lock(void)
{