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- /*
- * Basic support for controlling the 8259 Programmable Interrupt Controllers.
- *
- * Initially written by Michael Brown (mcb30).
- */
-
- #ifndef PIC8259_H
- #define PIC8259_H
-
- /* For segoff_t */
- #include "segoff.h"
-
- #define IRQ_PIC_CUTOFF (8)
-
- /* 8259 register locations */
- #define PIC1_ICW1 (0x20)
- #define PIC1_OCW2 (0x20)
- #define PIC1_OCW3 (0x20)
- #define PIC1_ICR (0x20)
- #define PIC1_IRR (0x20)
- #define PIC1_ISR (0x20)
- #define PIC1_ICW2 (0x21)
- #define PIC1_ICW3 (0x21)
- #define PIC1_ICW4 (0x21)
- #define PIC1_IMR (0x21)
- #define PIC2_ICW1 (0xa0)
- #define PIC2_OCW2 (0xa0)
- #define PIC2_OCW3 (0xa0)
- #define PIC2_ICR (0xa0)
- #define PIC2_IRR (0xa0)
- #define PIC2_ISR (0xa0)
- #define PIC2_ICW2 (0xa1)
- #define PIC2_ICW3 (0xa1)
- #define PIC2_ICW4 (0xa1)
- #define PIC2_IMR (0xa1)
-
- /* Register command values */
- #define OCW3_ID (0x08)
- #define OCW3_READ_IRR (0x03)
- #define OCW3_READ_ISR (0x02)
- #define ICR_EOI_NON_SPECIFIC (0x20)
- #define ICR_EOI_NOP (0x40)
- #define ICR_EOI_SPECIFIC (0x60)
- #define ICR_EOI_SET_PRIORITY (0xc0)
-
- /* Macros to enable/disable IRQs */
- #define IMR_REG(x) ( (x) < IRQ_PIC_CUTOFF ? PIC1_IMR : PIC2_IMR )
- #define IMR_BIT(x) ( 1 << ( (x) % IRQ_PIC_CUTOFF ) )
- #define irq_enabled(x) ( ( inb ( IMR_REG(x) ) & IMR_BIT(x) ) == 0 )
- #define enable_irq(x) outb ( inb( IMR_REG(x) ) & ~IMR_BIT(x), IMR_REG(x) )
- #define disable_irq(x) outb ( inb( IMR_REG(x) ) | IMR_BIT(x), IMR_REG(x) )
-
- /* Macros for acknowledging IRQs */
- #define ICR_REG(x) ( (x) < IRQ_PIC_CUTOFF ? PIC1_ICR : PIC2_ICR )
- #define ICR_VALUE(x) ( (x) % IRQ_PIC_CUTOFF )
- #define CHAINED_IRQ 2
-
- /* Utility macros to convert IRQ numbers to INT numbers and INT vectors */
- #define IRQ_INT(x) ( (x)<IRQ_PIC_CUTOFF ? (x)+0x08 : (x)-IRQ_PIC_CUTOFF+0x70 )
- #define INT_VECTOR(x) ( (segoff_t*) phys_to_virt( 4 * (x) ) )
- #define IRQ_VECTOR(x) ( INT_VECTOR ( IRQ_INT(x) ) )
-
- /* Other constants */
- typedef uint8_t irq_t;
- #define IRQ_MAX (15)
- #define IRQ_NONE (0xff)
-
- /* Function prototypes
- */
- int install_irq_handler ( irq_t irq, segoff_t *handler,
- uint8_t *previously_enabled,
- segoff_t *previous_handler );
- int remove_irq_handler ( irq_t irq, segoff_t *handler,
- uint8_t *previously_enabled,
- segoff_t *previous_handler );
- int install_trivial_irq_handler ( irq_t irq );
- int remove_trivial_irq_handler ( irq_t irq );
- int trivial_irq_triggered ( irq_t irq );
- int copy_trivial_irq_handler ( void *target, size_t target_size );
- void send_non_specific_eoi ( irq_t irq );
- void send_specific_eoi ( irq_t irq );
- void fake_irq ( irq_t irq );
- #ifdef DEBUG_IRQ
- void dump_irq_status ( void );
- #else
- #define dump_irq_status()
- #endif
-
- /* Other code (e.g. undi.c) needs to know the size of the trivial IRQ
- * handler code, so we put prototypes and the size macro here.
- */
- extern void _trivial_irq_handler ( void );
- extern void _trivial_irq_handler_end ( void );
- #define TRIVIAL_IRQ_HANDLER_SIZE FRAGMENT_SIZE(_trivial_irq_handler)
-
- #endif /* PIC8259_H */
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