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File: [Development] / linux-2.6-xfs / include / asm-x86 / i8259.h (download)

Revision 1.2, Tue Feb 26 16:44:40 2008 UTC (9 years, 7 months ago) by lachlan.longdrop.melbourne.sgi.com
Branch: MAIN
Changes since 1.1: +19 -1 lines 

Merge up to 2.6.25-rc3
Merge of 2.6.x-xfs-melb:linux:30555a by kenmcd.

#ifndef __ASM_I8259_H__
#define __ASM_I8259_H__

extern unsigned int cached_irq_mask;

#define __byte(x,y)		(((unsigned char *) &(y))[x])
#define cached_master_mask	(__byte(0, cached_irq_mask))
#define cached_slave_mask	(__byte(1, cached_irq_mask))

/* i8259A PIC registers */
#define PIC_MASTER_CMD		0x20
#define PIC_MASTER_IMR		0x21
#define PIC_MASTER_ISR		PIC_MASTER_CMD
#define PIC_MASTER_POLL		PIC_MASTER_ISR
#define PIC_MASTER_OCW3		PIC_MASTER_ISR
#define PIC_SLAVE_CMD		0xa0
#define PIC_SLAVE_IMR		0xa1

/* i8259A PIC related value */
#define PIC_CASCADE_IR		2
#define MASTER_ICW4_DEFAULT	0x01
#define SLAVE_ICW4_DEFAULT	0x01
#define PIC_ICW4_AEOI		2

extern spinlock_t i8259A_lock;

extern void init_8259A(int auto_eoi);
extern void enable_8259A_irq(unsigned int irq);
extern void disable_8259A_irq(unsigned int irq);
extern unsigned int startup_8259A_irq(unsigned int irq);

#define inb_pic		inb_p
#define outb_pic	outb_p

#endif	/* __ASM_I8259_H__ */