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/*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#ifndef IRQ_SHARED_IRQ_C_GLUE_H
#define IRQ_SHARED_IRQ_C_GLUE_H
/*
* This header describes the routines that are needed by the shared
* version of 'irq.c' (implementing the RTEMS irq API). They
* must be provided by the BSP.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
*/
#ifndef BSP_SHARED_HANDLER_SUPPORT
#define BSP_SHARED_HANDLER_SUPPORT 1
#endif
#include <rtems.h>
#include <rtems/irq.h>
#include <bsp/vectors.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* PIC-independent functions to enable/disable interrupt lines at
* the pic.
*
* NOTE: the routines must ignore requests for enabling/disabling
* interrupts that are outside of the range handled by the
* PIC(s).
*/
extern void BSP_enable_irq_at_pic(const rtems_irq_number irqLine);
/*
* RETURNS: nonzero (> 0 ) if irq was enabled originally, zero if irq
* was off and negative value if there was an error.
*/
extern int BSP_disable_irq_at_pic(const rtems_irq_number irqLine);
/*
* Initialize the PIC.
*/
extern int BSP_setup_the_pic(rtems_irq_global_settings* config);
/* IRQ dispatcher to be defined by the PIC driver; note that it MUST
* implement shared interrupts.
* Note also that the exception frame passed to this handler is not very
* meaningful. Only the volatile registers and vector info are stored.
*
*******************************************************************
* The routine must return zero if the interrupt was handled. If a
* nonzero value is returned the dispatcher may panic and flag an
* uncaught exception.
*******************************************************************
*/
int C_dispatch_irq_handler (BSP_Exception_frame *frame, unsigned int excNum);
/*
* Snippet to be used by PIC drivers and by bsp_irq_dispatch_list
* traverses list of shared handlers for a given interrupt
*
*/
static inline void
bsp_irq_dispatch_list_base(
rtems_irq_connect_data *tbl,
unsigned irq,
rtems_irq_hdl sentinel
)
{
rtems_irq_connect_data* vchain;
for( vchain = &tbl[irq];
((int)vchain != -1 && vchain->hdl != sentinel);
vchain = (rtems_irq_connect_data*)vchain->next_handler )
{
vchain->hdl(vchain->handle);
}
}
/*
* Snippet to be used by PIC drivers;
* enables interrupts, traverses list of
* shared handlers for a given interrupt
* and restores original irq level
*
* Note that _ISR_Get_level() & friends are preferable to
* manipulating MSR directly.
*/
static inline void
bsp_irq_dispatch_list(
rtems_irq_connect_data *tbl,
unsigned irq,
rtems_irq_hdl sentinel
)
{
register uint32_t l_orig;
l_orig = _ISR_Get_level();
/* Enable all interrupts */
_ISR_Set_level(0);
bsp_irq_dispatch_list_base( tbl, irq, sentinel );
/* Restore original level */
_ISR_Set_level(l_orig);
}
#ifdef __cplusplus
}
#endif
#endif
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