From f07a4c844da9f0ecae5bbee1ab94be56505f26f7 Mon Sep 17 00:00:00 2001 From: Thomas Bushnell Date: Tue, 25 Feb 1997 21:28:37 +0000 Subject: Initial source --- i386/util/cpu.h | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 i386/util/cpu.h (limited to 'i386/util/cpu.h') diff --git a/i386/util/cpu.h b/i386/util/cpu.h new file mode 100644 index 0000000..d90c6f8 --- /dev/null +++ b/i386/util/cpu.h @@ -0,0 +1,57 @@ +/* + * Copyright (c) 1995-1994 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_UTIL_CPU_H_ +#define _I386_UTIL_CPU_H_ + +#include + +#include "config.h" +#include "gdt.h" +#include "ldt.h" +#include "idt.h" + +/* + * Multiprocessor i386/i486 systems use a separate copy of the + * GDT, IDT, LDT, and kernel TSS per processor. The first three + * are separate to avoid lock contention: the i386 uses locked + * memory cycles to access the descriptor tables. The TSS is + * separate since each processor needs its own kernel stack, + * and since using a TSS marks it busy. + */ + +/* This structure holds the processor tables for this cpu. */ +struct cpu_tables +{ + struct i386_gate idt[IDTSZ]; + struct i386_descriptor gdt[GDTSZ]; +#ifdef ENABLE_KERNEL_LDT + struct i386_descriptor ldt[LDTSZ]; +#endif +#ifdef ENABLE_KERNEL_TSS + struct i386_tss tss; +#endif +}; + +#include_next "cpu.h" + +#endif _I386_UTIL_CPU_H_ -- cgit v1.2.3