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Current File : //usr/src/kernels/4.18.0-553.50.1.el8_10.x86_64/arch/x86/include/asm/i8259.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_I8259_H
#define _ASM_X86_I8259_H

#include <linux/delay.h>
#include <asm/io.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 raw_spinlock_t i8259A_lock;

/* the PIC may need a careful delay on some platforms, hence specific calls */
static inline unsigned char inb_pic(unsigned int port)
{
	unsigned char value = inb(port);

	/*
	 * delay for some accesses to PIC on motherboard or in chipset
	 * must be at least one microsecond, so be safe here:
	 */
	udelay(2);

	return value;
}

static inline void outb_pic(unsigned char value, unsigned int port)
{
	outb(value, port);
	/*
	 * delay for some accesses to PIC on motherboard or in chipset
	 * must be at least one microsecond, so be safe here:
	 */
	udelay(2);
}

extern struct irq_chip i8259A_chip;

struct legacy_pic {
	int nr_legacy_irqs;
	struct irq_chip *chip;
	void (*mask)(unsigned int irq);
	void (*unmask)(unsigned int irq);
	void (*mask_all)(void);
	void (*restore_mask)(void);
	void (*init)(int auto_eoi);
	int (*probe)(void);
	int (*irq_pending)(unsigned int irq);
	void (*make_irq)(unsigned int irq);
};

extern struct legacy_pic *legacy_pic;
extern struct legacy_pic null_legacy_pic;

static inline bool has_legacy_pic(void)
{
	return legacy_pic != &null_legacy_pic;
}

static inline int nr_legacy_irqs(void)
{
	return legacy_pic->nr_legacy_irqs;
}

#endif /* _ASM_X86_I8259_H */

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