diff options
author | Thomas Bushnell <thomas@gnu.org> | 1997-02-25 21:28:37 +0000 |
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committer | Thomas Bushnell <thomas@gnu.org> | 1997-02-25 21:28:37 +0000 |
commit | f07a4c844da9f0ecae5bbee1ab94be56505f26f7 (patch) | |
tree | 12b07c7e578fc1a5f53dbfde2632408491ff2a70 /i386/pc/irq.h |
Initial source
Diffstat (limited to 'i386/pc/irq.h')
-rw-r--r-- | i386/pc/irq.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/i386/pc/irq.h b/i386/pc/irq.h new file mode 100644 index 0000000..1f9da9a --- /dev/null +++ b/i386/pc/irq.h @@ -0,0 +1,49 @@ +/* + * Copyright (c) 1995 The University of Utah and + * the Computer Systems Laboratory at the University of Utah (CSL). + * All rights reserved. + * + * Permission to use, copy, modify and distribute this software is hereby + * granted provided that (1) source code retains these copyright, permission, + * and disclaimer notices, and (2) redistributions including binaries + * reproduce the notices in supporting documentation, and (3) all advertising + * materials mentioning features or use of this software display the following + * acknowledgement: ``This product includes software developed by the + * Computer Systems Laboratory at the University of Utah.'' + * + * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS + * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF + * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * CSL requests users of this software to return to csl-dist@cs.utah.edu any + * improvements that they make and grant CSL redistribution rights. + * + * Author: Bryan Ford, University of Utah CSL + */ +#ifndef _I386_PC_IRQ_H_ +#define _I386_PC_IRQ_H_ + +/* On normal PCs, there are always 16 IRQ lines. */ +#define IRQ_COUNT 16 + +/* Start of hardware interrupt vectors in the IDT. */ +#define IDT_IRQ_BASE 0x20 + +/* Variables storing the master and slave PIC interrupt vector base. */ +extern int irq_master_base, irq_slave_base; + +/* Routine called just after entering protected mode for the first time, + to set up the IRQ interrupt vectors in the protected-mode IDT. + It should initialize IDT entries irq_master_base through irq_master_base+7, + and irq_slave_base through irq_slave_base+7. */ +extern void idt_irq_init(void); + +/* Fill an IRQ gate in a CPU's IDT. + Always uses an interrupt gate; just set `access' to the privilege level. */ +#define fill_irq_gate(cpu, irq_num, entry, selector, access) \ + fill_idt_gate(cpu, (irq_num) < 8 \ + ? irq_master_base+(irq_num) \ + : irq_slave_base+(irq_num)-8, \ + entry, selector, ACC_INTR_GATE | (access)) + +#endif _I386_PC_IRQ_H_ |