[efi] Add EFI entropy source
[ipxe.git] / src / arch / x86 / include / pic8259.h
1 /*
2 * Basic support for controlling the 8259 Programmable Interrupt Controllers.
3 *
4 * Initially written by Michael Brown (mcb30).
5 */
6
7 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
8
9 #ifndef PIC8259_H
10 #define PIC8259_H
11
12 #include <ipxe/io.h>
13
14 #define IRQ_PIC_CUTOFF 8
15
16 /* 8259 register locations */
17 #define PIC1_ICW1 0x20
18 #define PIC1_OCW2 0x20
19 #define PIC1_OCW3 0x20
20 #define PIC1_ICR 0x20
21 #define PIC1_IRR 0x20
22 #define PIC1_ISR 0x20
23 #define PIC1_ICW2 0x21
24 #define PIC1_ICW3 0x21
25 #define PIC1_ICW4 0x21
26 #define PIC1_IMR 0x21
27 #define PIC2_ICW1 0xa0
28 #define PIC2_OCW2 0xa0
29 #define PIC2_OCW3 0xa0
30 #define PIC2_ICR 0xa0
31 #define PIC2_IRR 0xa0
32 #define PIC2_ISR 0xa0
33 #define PIC2_ICW2 0xa1
34 #define PIC2_ICW3 0xa1
35 #define PIC2_ICW4 0xa1
36 #define PIC2_IMR 0xa1
37
38 /* Register command values */
39 #define OCW3_ID 0x08
40 #define OCW3_READ_IRR 0x03
41 #define OCW3_READ_ISR 0x02
42 #define ICR_EOI_NON_SPECIFIC 0x20
43 #define ICR_EOI_NOP 0x40
44 #define ICR_EOI_SPECIFIC 0x60
45 #define ICR_EOI_SET_PRIORITY 0xc0
46
47 /* Macros to enable/disable IRQs */
48 #define IMR_REG(x) ( (x) < IRQ_PIC_CUTOFF ? PIC1_IMR : PIC2_IMR )
49 #define IMR_BIT(x) ( 1 << ( (x) % IRQ_PIC_CUTOFF ) )
50 #define irq_enabled(x) ( ( inb ( IMR_REG(x) ) & IMR_BIT(x) ) == 0 )
51 #define enable_irq(x) outb ( inb( IMR_REG(x) ) & ~IMR_BIT(x), IMR_REG(x) )
52 #define disable_irq(x) outb ( inb( IMR_REG(x) ) | IMR_BIT(x), IMR_REG(x) )
53
54 /* Macros for acknowledging IRQs */
55 #define ICR_REG( irq ) ( (irq) < IRQ_PIC_CUTOFF ? PIC1_ICR : PIC2_ICR )
56 #define ICR_VALUE( irq ) ( (irq) % IRQ_PIC_CUTOFF )
57 #define CHAINED_IRQ 2
58
59 /* Utility macros to convert IRQ numbers to INT numbers and INT vectors */
60 #define IRQ_INT( irq ) ( ( ( (irq) - IRQ_PIC_CUTOFF ) ^ 0x70 ) & 0x7f )
61
62 /* Other constants */
63 #define IRQ_MAX 15
64 #define IRQ_NONE -1U
65
66 /* Function prototypes
67 */
68 void send_eoi ( unsigned int irq );
69
70 #endif /* PIC8259_H */