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Last change
on this file was
e16e8f2,
checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago
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bootstuff
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-
Property mode set to
100644
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File size:
1.8 KB
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| 1 | /* |
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| 2 | * Basic support for controlling the 8259 Programmable Interrupt Controllers. |
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| 3 | * |
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| 4 | * Initially written by Michael Brown (mcb30). |
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| 5 | */ |
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| 6 | |
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| 7 | FILE_LICENCE ( GPL2_OR_LATER ); |
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| 8 | |
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| 9 | #ifndef PIC8259_H |
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| 10 | #define PIC8259_H |
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| 11 | |
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| 12 | /* For segoff_t */ |
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| 13 | #include "realmode.h" |
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| 14 | |
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| 15 | #define IRQ_PIC_CUTOFF 8 |
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| 16 | |
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| 17 | /* 8259 register locations */ |
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| 18 | #define PIC1_ICW1 0x20 |
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| 19 | #define PIC1_OCW2 0x20 |
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| 20 | #define PIC1_OCW3 0x20 |
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| 21 | #define PIC1_ICR 0x20 |
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| 22 | #define PIC1_IRR 0x20 |
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| 23 | #define PIC1_ISR 0x20 |
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| 24 | #define PIC1_ICW2 0x21 |
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| 25 | #define PIC1_ICW3 0x21 |
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| 26 | #define PIC1_ICW4 0x21 |
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| 27 | #define PIC1_IMR 0x21 |
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| 28 | #define PIC2_ICW1 0xa0 |
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| 29 | #define PIC2_OCW2 0xa0 |
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| 30 | #define PIC2_OCW3 0xa0 |
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| 31 | #define PIC2_ICR 0xa0 |
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| 32 | #define PIC2_IRR 0xa0 |
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| 33 | #define PIC2_ISR 0xa0 |
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| 34 | #define PIC2_ICW2 0xa1 |
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| 35 | #define PIC2_ICW3 0xa1 |
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| 36 | #define PIC2_ICW4 0xa1 |
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| 37 | #define PIC2_IMR 0xa1 |
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| 38 | |
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| 39 | /* Register command values */ |
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| 40 | #define OCW3_ID 0x08 |
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| 41 | #define OCW3_READ_IRR 0x03 |
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| 42 | #define OCW3_READ_ISR 0x02 |
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| 43 | #define ICR_EOI_NON_SPECIFIC 0x20 |
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| 44 | #define ICR_EOI_NOP 0x40 |
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| 45 | #define ICR_EOI_SPECIFIC 0x60 |
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| 46 | #define ICR_EOI_SET_PRIORITY 0xc0 |
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| 47 | |
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| 48 | /* Macros to enable/disable IRQs */ |
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| 49 | #define IMR_REG(x) ( (x) < IRQ_PIC_CUTOFF ? PIC1_IMR : PIC2_IMR ) |
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| 50 | #define IMR_BIT(x) ( 1 << ( (x) % IRQ_PIC_CUTOFF ) ) |
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| 51 | #define irq_enabled(x) ( ( inb ( IMR_REG(x) ) & IMR_BIT(x) ) == 0 ) |
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| 52 | #define enable_irq(x) outb ( inb( IMR_REG(x) ) & ~IMR_BIT(x), IMR_REG(x) ) |
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| 53 | #define disable_irq(x) outb ( inb( IMR_REG(x) ) | IMR_BIT(x), IMR_REG(x) ) |
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| 54 | |
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| 55 | /* Macros for acknowledging IRQs */ |
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| 56 | #define ICR_REG( irq ) ( (irq) < IRQ_PIC_CUTOFF ? PIC1_ICR : PIC2_ICR ) |
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| 57 | #define ICR_VALUE( irq ) ( (irq) % IRQ_PIC_CUTOFF ) |
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| 58 | #define CHAINED_IRQ 2 |
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| 59 | |
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| 60 | /* Utility macros to convert IRQ numbers to INT numbers and INT vectors */ |
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| 61 | #define IRQ_INT( irq ) ( ( ( (irq) - IRQ_PIC_CUTOFF ) ^ 0x70 ) & 0x7f ) |
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| 62 | |
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| 63 | /* Other constants */ |
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| 64 | #define IRQ_MAX 15 |
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| 65 | #define IRQ_NONE -1U |
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| 66 | |
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| 67 | /* Function prototypes |
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| 68 | */ |
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| 69 | void send_eoi ( unsigned int irq ); |
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| 70 | |
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| 71 | #endif /* PIC8259_H */ |
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