Annotation of sys/arch/i386/include/i8259.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: i8259.h,v 1.4 2006/04/14 22:26:46 weingart Exp $ */
! 2: /* $NetBSD: i8259.h,v 1.3 2003/05/04 22:01:56 fvdl Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1990 The Regents of the University of California.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to Berkeley by
! 9: * William Jolitz.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: *
! 35: * @(#)icu.h 5.6 (Berkeley) 5/9/91
! 36: */
! 37:
! 38: #ifndef _I386_I8259_H_
! 39: #define _I386_I8259_H_
! 40:
! 41: #include <dev/isa/isareg.h>
! 42:
! 43: #ifndef _LOCORE
! 44:
! 45: /*
! 46: * Interrupt "level" mechanism variables, masks, and macros
! 47: */
! 48: extern unsigned imen; /* interrupt mask enable */
! 49: extern unsigned i8259_setmask(unsigned);
! 50:
! 51: #define SET_ICUS() (outb(IO_ICU1 + 1, imen), outb(IO_ICU2 + 1, imen >> 8))
! 52:
! 53: extern void i8259_default_setup(void);
! 54: extern void i8259_reinit(void);
! 55:
! 56: #endif /* !_LOCORE */
! 57:
! 58: /*
! 59: * Interrupt enable bits -- in order of priority
! 60: */
! 61: #define IRQ_SLAVE 2
! 62:
! 63: /*
! 64: * Interrupt Control offset into Interrupt descriptor table (IDT)
! 65: */
! 66: #define ICU_OFFSET 32 /* 0-31 are processor exceptions */
! 67: #define ICU_LEN 16 /* 32-47 are ISA interrupts */
! 68:
! 69:
! 70: #define ICU_HARDWARE_MASK
! 71:
! 72: /*
! 73: * These macros are fairly self explanatory. If ICU_SPECIAL_MASK_MODE is
! 74: * defined, we try to take advantage of the ICU's `special mask mode' by only
! 75: * EOIing the interrupts on return. This avoids the requirement of masking and
! 76: * unmasking. We can't do this without special mask mode, because the ICU
! 77: * would also hold interrupts that it thinks are of lower priority.
! 78: *
! 79: * Many machines do not support special mask mode, so by default we don't try
! 80: * to use it.
! 81: */
! 82:
! 83: #define IRQ_BIT(num) (1 << ((num) % 8))
! 84: #define IRQ_BYTE(num) ((num) >> 3)
! 85:
! 86: #define i8259_late_ack(num)
! 87:
! 88: #ifdef ICU_SPECIAL_MASK_MODE
! 89:
! 90: #define i8259_asm_ack1(num)
! 91: #define i8259_asm_ack2(num) \
! 92: movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\
! 93: outb %al,$IO_ICU1
! 94: #define i8259_asm_mask(num)
! 95: #define i8259_asm_unmask(num) \
! 96: movb $(0x60|(num%8)),%al /* specific EOI */ ;\
! 97: outb %al,$ICUADDR
! 98:
! 99: #else /* ICU_SPECIAL_MASK_MODE */
! 100:
! 101: #ifndef AUTO_EOI_1
! 102: #define i8259_asm_ack1(num) \
! 103: movb $(0x60|(num%8)),%al /* specific EOI */ ;\
! 104: outb %al,$IO_ICU1
! 105: #else
! 106: #define i8259_asm_ack1(num)
! 107: #endif
! 108:
! 109: #ifndef AUTO_EOI_2
! 110: #define i8259_asm_ack2(num) \
! 111: movb $(0x60|(num%8)),%al /* specific EOI */ ;\
! 112: outb %al,$IO_ICU2 /* do the second ICU first */ ;\
! 113: movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\
! 114: outb %al,$IO_ICU1
! 115: #else
! 116: #define i8259_asm_ack2(num)
! 117: #endif
! 118:
! 119: #ifdef ICU_HARDWARE_MASK
! 120:
! 121: #define i8259_asm_mask(num) \
! 122: movb CVAROFF(imen, IRQ_BYTE(num)),%al ;\
! 123: orb $IRQ_BIT(num),%al ;\
! 124: movb %al,CVAROFF(imen, IRQ_BYTE(num)) ;\
! 125: pushl %eax ;\
! 126: inb $0x84,%al ;\
! 127: popl %eax ;\
! 128: outb %al,$(ICUADDR+1)
! 129: #define i8259_asm_unmask(num) \
! 130: cli ;\
! 131: movb CVAROFF(imen, IRQ_BYTE(num)),%al ;\
! 132: andb $~IRQ_BIT(num),%al ;\
! 133: movb %al,CVAROFF(imen, IRQ_BYTE(num)) ;\
! 134: pushl %eax ;\
! 135: inb $0x84,%al ;\
! 136: popl %eax ;\
! 137: outb %al,$(ICUADDR+1) ;\
! 138: sti
! 139:
! 140: #else /* ICU_HARDWARE_MASK */
! 141:
! 142: #define i8259_asm_mask(num)
! 143: #define i8259_asm_unmask(num)
! 144:
! 145: #endif /* ICU_HARDWARE_MASK */
! 146: #endif /* ICU_SPECIAL_MASK_MODE */
! 147:
! 148: #endif /* !_X86_I8259_H_ */
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