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/*
* 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_GDT_
#define _I386_GDT_
#include <mach/machine/seg.h>
/*
* Collect and define the GDT segment selectors.
* xxx_IDX is the index number of the selector;
* xxx is the actual selector value (index * 8).
*/
enum gdt_idx
{
GDT_NULL_IDX = 0,
#define gdt_sel(name) name##_IDX,
#include "gdt_sels.h"
#undef gdt_sel
GDT_FIRST_FREE_IDX
};
enum gdt_sel
{
GDT_NULL = 0,
#define gdt_sel(name) name = name##_IDX * 8,
#include "gdt_sels.h"
#undef gdt_sel
};
#define GDTSZ GDT_FIRST_FREE_IDX
/* If we have a KERNEL_TSS, use that as our DEFAULT_TSS if none is defined yet.
(The DEFAULT_TSS gets loaded by cpu_tables_load() upon switching to pmode.)
Similarly with DEFAULT_LDT. */
#if defined(ENABLE_KERNEL_TSS) && !defined(DEFAULT_TSS)
#define DEFAULT_TSS KERNEL_TSS
#define DEFAULT_TSS_IDX KERNEL_TSS_IDX
#endif
#if defined(ENABLE_KERNEL_LDT) && !defined(DEFAULT_LDT)
#define DEFAULT_LDT KERNEL_LDT
#define DEFAULT_LDT_IDX KERNEL_LDT_IDX
#endif
/* Fill a segment descriptor in a CPU's GDT. */
#define fill_gdt_descriptor(cpu, segment, base, limit, access, sizebits) \
fill_descriptor(&(cpu)->tables.gdt[segment/8], \
base, limit, access, sizebits)
#define i16_fill_gdt_descriptor(cpu, segment, base, limit, access, sizebits) \
i16_fill_descriptor(&(cpu)->tables.gdt[segment/8], \
base, limit, access, sizebits)
/* This automatically defines GDT descriptor initialization functions. */
#define gdt_desc_initializer(segment, base, limit, access, sizebits) \
void cpu_gdt_init_##segment(struct cpu *cpu) \
{ \
fill_gdt_descriptor(cpu, segment, base, limit, \
access, sizebits); \
}
#endif _I386_GDT_
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