Data structure and functions used to control i8259 chip. More...

Macros
8259 edge/level control definitions at VIA
#define	ISA8259_M_ELCR 0x4d0

#define	ISA8259_S_ELCR 0x4d1

#define	ELCRS_INT15_LVL 0x80

#define	ELCRS_INT14_LVL 0x40

#define	ELCRS_INT13_LVL 0x20

#define	ELCRS_INT12_LVL 0x10

#define	ELCRS_INT11_LVL 0x08

#define	ELCRS_INT10_LVL 0x04

#define	ELCRS_INT9_LVL 0x02

#define	ELCRS_INT8_LVL 0x01

#define	ELCRM_INT7_LVL 0x80

#define	ELCRM_INT6_LVL 0x40

#define	ELCRM_INT5_LVL 0x20

#define	ELCRM_INT4_LVL 0x10

#define	ELCRM_INT3_LVL 0x8

#define	ELCRM_INT2_LVL 0x4

#define	ELCRM_INT1_LVL 0x2

#define	ELCRM_INT0_LVL 0x1

PIC's command and mask registers
#define	PIC_MASTER_COMMAND_IO_PORT 0x20
	Master PIC command register *‍/.

#define	PIC_SLAVE_COMMAND_IO_PORT 0xa0
	Slave PIC command register *‍/.

#define	PIC_MASTER_IMR_IO_PORT 0x21
	Master PIC Interrupt Mask Register *‍/.

#define	PIC_SLAVE_IMR_IO_PORT 0xa1
	Slave PIC Interrupt Mask Register *‍/.

Command for specific EOI (End Of Interrupt): Interrupt acknowledge
#define	PIC_EOSI 0x60
	End of Specific Interrupt (EOSI) *‍/.

#define	SLAVE_PIC_EOSI 0x62
	End of Specific Interrupt (EOSI) for cascade *‍/.

#define	PIC_EOI 0x20
	Generic End of Interrupt (EOI) *‍/.

Functions
Function Prototypes
void	BSP_i8259s_init (void)

int	BSP_irq_disable_at_i8259s (const rtems_irq_number irqLine)
	function to disable a particular irq at 8259 level.

int	BSP_irq_enable_at_i8259s (const rtems_irq_number irqLine)
	function to enable a particular irq at 8259 level.

int	BSP_irq_ack_at_i8259s (const rtems_irq_number irqLine)
	function to acknowledge a particular irq at 8259 level.

int	BSP_irq_enabled_at_i8259s (const rtems_irq_number irqLine)
	function to check if a particular irq is enabled at 8259 level.

int	BSP_i8259s_int_process (void)

void	BSP_rtems_irq_mng_init (unsigned cpuId)

Type definition for RTEMS managed interrupts
typedef unsigned short	rtems_i8259_masks

volatile rtems_i8259_masks	i8259s_cache

Detailed Description

Data structure and functions used to control i8259 chip.

This include file describe the data structure and the functions implemented by RTEMS to control the i8259 chip.

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.

Macros