mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#ifndef _ASM_X86_I8259_H
|
|
#define _ASM_X86_I8259_H
|
|
|
|
#include <linux/delay.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_all)(void);
|
|
void (*restore_mask)(void);
|
|
void (*init)(int auto_eoi);
|
|
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;
|
|
|
|
#endif /* _ASM_X86_I8259_H */
|