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Annotation of Gnu-Mach/i386/util/gdt.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1995-1994 The University of Utah and
        !             3:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software is hereby
        !             7:  * granted provided that (1) source code retains these copyright, permission,
        !             8:  * and disclaimer notices, and (2) redistributions including binaries
        !             9:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            10:  * materials mentioning features or use of this software display the following
        !            11:  * acknowledgement: ``This product includes software developed by the
        !            12:  * Computer Systems Laboratory at the University of Utah.''
        !            13:  *
        !            14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  *
        !            18:  * CSL requests users of this software to return to [email protected] any
        !            19:  * improvements that they make and grant CSL redistribution rights.
        !            20:  *
        !            21:  *      Author: Bryan Ford, University of Utah CSL
        !            22:  */
        !            23: #ifndef _I386_GDT_
        !            24: #define _I386_GDT_
        !            25: 
        !            26: #include <mach/machine/seg.h>
        !            27: 
        !            28: /*
        !            29:  * Collect and define the GDT segment selectors.
        !            30:  * xxx_IDX is the index number of the selector;
        !            31:  * xxx is the actual selector value (index * 8).
        !            32:  */
        !            33: enum gdt_idx
        !            34: {
        !            35:        GDT_NULL_IDX = 0,
        !            36: 
        !            37: #define gdt_sel(name) name##_IDX,
        !            38: #include "gdt_sels.h"
        !            39: #undef gdt_sel
        !            40: 
        !            41:        GDT_FIRST_FREE_IDX
        !            42: };
        !            43: 
        !            44: enum gdt_sel
        !            45: {
        !            46:        GDT_NULL = 0,
        !            47: 
        !            48: #define gdt_sel(name) name = name##_IDX * 8,
        !            49: #include "gdt_sels.h"
        !            50: #undef gdt_sel
        !            51: };
        !            52: 
        !            53: #define GDTSZ GDT_FIRST_FREE_IDX
        !            54: 
        !            55: 
        !            56: /* If we have a KERNEL_TSS, use that as our DEFAULT_TSS if none is defined yet.
        !            57:    (The DEFAULT_TSS gets loaded by cpu_tables_load() upon switching to pmode.)
        !            58:    Similarly with DEFAULT_LDT.  */
        !            59: #if defined(ENABLE_KERNEL_TSS) && !defined(DEFAULT_TSS)
        !            60: #define DEFAULT_TSS    KERNEL_TSS
        !            61: #define DEFAULT_TSS_IDX        KERNEL_TSS_IDX
        !            62: #endif
        !            63: #if defined(ENABLE_KERNEL_LDT) && !defined(DEFAULT_LDT)
        !            64: #define DEFAULT_LDT    KERNEL_LDT
        !            65: #define DEFAULT_LDT_IDX        KERNEL_LDT_IDX
        !            66: #endif
        !            67: 
        !            68: 
        !            69: /* Fill a segment descriptor in a CPU's GDT.  */
        !            70: #define fill_gdt_descriptor(cpu, segment, base, limit, access, sizebits) \
        !            71:        fill_descriptor(&(cpu)->tables.gdt[segment/8],                  \
        !            72:                        base, limit, access, sizebits)
        !            73: 
        !            74: #define i16_fill_gdt_descriptor(cpu, segment, base, limit, access, sizebits) \
        !            75:        i16_fill_descriptor(&(cpu)->tables.gdt[segment/8],              \
        !            76:                            base, limit, access, sizebits)
        !            77: 
        !            78: 
        !            79: /* This automatically defines GDT descriptor initialization functions.  */
        !            80: #define gdt_desc_initializer(segment, base, limit, access, sizebits)   \
        !            81:        void cpu_gdt_init_##segment(struct cpu *cpu)                    \
        !            82:        {                                                               \
        !            83:                fill_gdt_descriptor(cpu, segment, base, limit,          \
        !            84:                                    access, sizebits);                  \
        !            85:        }
        !            86: 
        !            87: 
        !            88: #endif _I386_GDT_

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