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/**
* @file
* @ingroup i386_irq
* @brief Interrupt handlers
*/
/* irq.h
*
* This include file describe the data structure and the functions implemented
* by rtems to write interrupt handlers.
*
* CopyRight (C) 1998 valette@crf.canon.fr
*
* This code is heavilly inspired by the public specification of STREAM V2
* that can be found at :
*
* <http://www.chorus.com/Documentation/index.html> by following
* the STREAM API Specification Document link.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/**
* @defgroup i386_irq Interrupt handlers
* @ingroup i386_shared
* @brief Data structure and the functions to write interrupt handlers
* @{
*/
#ifndef _IRQ_H_
#define _IRQ_H_
#ifdef __cplusplus
extern "C" {
#endif
/** @brief
* Include some preprocessor value also used by assember code
*/
#include <bsp/irq_asm.h>
#include <rtems.h>
#define BSP_SHARED_HANDLER_SUPPORT 1
#include <rtems/irq.h>
#include <rtems/irq-extension.h>
/*-------------------------------------------------------------------------+
| Constants
+--------------------------------------------------------------------------*/
/** @brief Base vector for our IRQ handlers. */
#define BSP_IRQ_VECTOR_BASE BSP_ASM_IRQ_VECTOR_BASE
#define BSP_IRQ_LINES_NUMBER 17
#define BSP_LOWEST_OFFSET 0
#define BSP_MAX_ON_i8259S (BSP_IRQ_LINES_NUMBER - 2)
#define BSP_MAX_OFFSET (BSP_IRQ_LINES_NUMBER - 1)
/** @brief
* Interrupt offset in comparison to BSP_ASM_IRQ_VECTOR_BASE
* NB : 1) Interrupt vector number in IDT = offset + BSP_ASM_IRQ_VECTOR_BASE
* 2) The same name should be defined on all architecture
* so that handler connection can be unchanged.
*/
#define BSP_PERIODIC_TIMER 0
#define BSP_KEYBOARD 1
#define BSP_UART_COM2_IRQ 3
#define BSP_UART_COM1_IRQ 4
#define BSP_UART_COM3_IRQ 5
#define BSP_UART_COM4_IRQ 6
#define BSP_RT_TIMER1 8
#define BSP_RT_TIMER3 10
#define BSP_SMP_IPI 16
#define BSP_INTERRUPT_VECTOR_MIN BSP_LOWEST_OFFSET
#define BSP_INTERRUPT_VECTOR_MAX BSP_MAX_OFFSET
/** @brief
* Type definition for RTEMS managed interrupts
*/
typedef unsigned short rtems_i8259_masks;
/**
* @brief Contains the current IMR of both i8259s.
*/
extern rtems_i8259_masks i8259s_cache;
/**
* @brief Contains the super IMR of both i8259s to overrule i8259s_cache during
* interrupt exit.
*
* This enables a bsp_interrupt_vector_disable() in interrupt handlers. This
* is required for the interrupt server support used by the new network stack.
*/
extern rtems_i8259_masks i8259s_super_imr;
/*-------------------------------------------------------------------------+
| Function Prototypes.
+--------------------------------------------------------------------------*/
/*
* ------------------------ Intel 8259 (or emulation) Mngt Routines -------
*/
/** @brief
* function to disable a particular irq at 8259 level. After calling
* this function, even if the device asserts the interrupt line it will
* not be propagated further to the processor
*/
int BSP_irq_disable_at_i8259s (const rtems_irq_number irqLine);
/** @brief
* function to enable a particular irq at 8259 level. After calling
* this function, if the device asserts the interrupt line it will
* be propagated further to the processor
*/
int BSP_irq_enable_at_i8259s (const rtems_irq_number irqLine);
/** @brief
* function to acknoledge a particular irq at 8259 level. After calling
* this function, if a device asserts an enabled interrupt line it will
* be propagated further to the processor. Mainly usefull for people
* writting raw handlers as this is automagically done for rtems managed
* handlers.
*/
int BSP_irq_ack_at_i8259s (const rtems_irq_number irqLine);
/** @brief
* function to check if a particular irq is enabled at 8259 level. After calling
*/
int BSP_irq_enabled_at_i8259s (const rtems_irq_number irqLine);
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* _IRQ_H_ */
|
