1 #ifndef _ASM_X86_I8259_H 2 #define _ASM_X86_I8259_H 3 4 #include <linux/delay.h> 5 6 extern unsigned int cached_irq_mask; 7 8 #define __byte(x, y) (((unsigned char *)&(y))[x]) 9 #define cached_master_mask (__byte(0, cached_irq_mask)) 10 #define cached_slave_mask (__byte(1, cached_irq_mask)) 11 12 /* i8259A PIC registers */ 13 #define PIC_MASTER_CMD 0x20 14 #define PIC_MASTER_IMR 0x21 15 #define PIC_MASTER_ISR PIC_MASTER_CMD 16 #define PIC_MASTER_POLL PIC_MASTER_ISR 17 #define PIC_MASTER_OCW3 PIC_MASTER_ISR 18 #define PIC_SLAVE_CMD 0xa0 19 #define PIC_SLAVE_IMR 0xa1 20 21 /* i8259A PIC related value */ 22 #define PIC_CASCADE_IR 2 23 #define MASTER_ICW4_DEFAULT 0x01 24 #define SLAVE_ICW4_DEFAULT 0x01 25 #define PIC_ICW4_AEOI 2 26 27 extern raw_spinlock_t i8259A_lock; 28 29 /* the PIC may need a careful delay on some platforms, hence specific calls */ 30 static inline unsigned char inb_pic(unsigned int port) 31 { 32 unsigned char value = inb(port); 33 34 /* 35 * delay for some accesses to PIC on motherboard or in chipset 36 * must be at least one microsecond, so be safe here: 37 */ 38 udelay(2); 39 40 return value; 41 } 42 43 static inline void outb_pic(unsigned char value, unsigned int port) 44 { 45 outb(value, port); 46 /* 47 * delay for some accesses to PIC on motherboard or in chipset 48 * must be at least one microsecond, so be safe here: 49 */ 50 udelay(2); 51 } 52 53 extern struct irq_chip i8259A_chip; 54 55 struct legacy_pic { 56 int nr_legacy_irqs; 57 struct irq_chip *chip; 58 void (*mask)(unsigned int irq); 59 void (*unmask)(unsigned int irq); 60 void (*mask_all)(void); 61 void (*restore_mask)(void); 62 void (*init)(int auto_eoi); 63 int (*irq_pending)(unsigned int irq); 64 void (*make_irq)(unsigned int irq); 65 }; 66 67 extern struct legacy_pic *legacy_pic; 68 extern struct legacy_pic null_legacy_pic; 69 70 static inline int nr_legacy_irqs(void) 71 { 72 return legacy_pic->nr_legacy_irqs; 73 } 74 75 #endif /* _ASM_X86_I8259_H */ 76