i8259.h File Reference

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

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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.