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. More...

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

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

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.

Macros