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c10dc130f9
* shared/irq/i8259.c, shared/irq/irq.h, shared/irq/irq_supp.h, shared/irq/openpic_i8259_irq.c: BSP_disable_irq_at_pic(), openpic_disable_irq(), BSP_irq_disable_at_i8259s() now return 0/1 if irq was disabled/enabled prior to disabling. irq_supp.h now exports a inline helper routine for scanning a list of shared handlers; to be used by PIC drivers.
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
#ifndef IRQ_SHARED_IRQ_C_GLUE_H
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#define IRQ_SHARED_IRQ_C_GLUE_H
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/*
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* This header describes the routines that are needed by the shared
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* version of 'irq.c' (implementing the RTEMS irq API). They
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* must be provided by the BSP.
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*
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* The license and distribution terms for this file may be
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* found in found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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*/
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#ifndef BSP_SHARED_HANDLER_SUPPORT
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#define BSP_SHARED_HANDLER_SUPPORT 1
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#endif
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#include <rtems/irq.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* PIC-independent functions to enable/disable interrupt lines at
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* the pic.
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*
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* NOTE: the routines must ignore requests for enabling/disabling
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* interrupts that are outside of the range handled by the
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* PIC(s).
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*/
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extern void BSP_enable_irq_at_pic (const rtems_irq_number irqLine);
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/*
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* RETURNS: nonzero (> 0 ) if irq was enabled originally, zero if irq
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* was off and negative value if there was an error.
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*/
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extern int BSP_disable_irq_at_pic (const rtems_irq_number irqLine);
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/*
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* Initialize the PIC.
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* Return nonzero on success, zero on failure (which will be treated
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* as fatal by the manager).
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*/
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extern int BSP_setup_the_pic (rtems_irq_global_settings* config);
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struct _BSP_Exception_frame;
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/* IRQ dispatcher to be defined by the PIC driver; note that it MUST
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* implement shared interrupts.
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* Note that the exception frame passed to this handler is not very
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* meaningful. Only the volatile registers and info are set up.
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*/
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void C_dispatch_irq_handler (struct _BSP_Exception_frame *frame, unsigned int excNum);
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/*
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* Snippet to be used by PIC drivers;
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* enables interrupts, traverses list of
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* shared handlers for a given interrupt
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* and restores original irq level
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*/
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static inline void
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bsp_irq_dispatch_list(rtems_irq_connect_data *tbl, unsigned irq, rtems_irq_hdl sentinel)
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{
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register uint32_t l_orig;
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l_orig = _ISR_Get_level();
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/* Enable all interrupts */
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_ISR_Set_level(0);
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/* rtems_hdl_tbl[irq].hdl(rtems_hdl_tbl[irq].handle); */
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{
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rtems_irq_connect_data* vchain;
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for( vchain = &tbl[irq];
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((int)vchain != -1 && vchain->hdl != sentinel);
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vchain = (rtems_irq_connect_data*)vchain->next_handler )
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{
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vchain->hdl(vchain->handle);
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}
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}
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/* Restore original level */
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_ISR_Set_level(l_orig);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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