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Annotation of Gnu-Mach/i386/util/i16/i16_gdt_init_temp.c, 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: 
        !            24: #include <mach/machine/code16.h>
        !            25: #include <mach/machine/seg.h>
        !            26: 
        !            27: #include "vm_param.h"
        !            28: #include "cpu.h"
        !            29: 
        !            30: 
        !            31: CODE16
        !            32: 
        !            33: /* This 16-bit function initializes CPU 0's GDT
        !            34:    just enough to get in and out of protected (and possibly paged) mode,
        !            35:    with all addresses assuming identity-mapped memory.  */
        !            36: void i16_gdt_init_temp()
        !            37: {
        !            38:        /* Create temporary kernel code and data segment descriptors.
        !            39:           (They'll be reinitialized later after paging is enabled.)  */
        !            40:        i16_fill_gdt_descriptor(&cpu[0], KERNEL_CS,
        !            41:                                boot_image_pa, 0xffffffff,
        !            42:                                ACC_PL_K|ACC_CODE_R, SZ_32);
        !            43:        i16_fill_gdt_descriptor(&cpu[0], KERNEL_DS,
        !            44:                                boot_image_pa, 0xffffffff,
        !            45:                                ACC_PL_K|ACC_DATA_W, SZ_32);
        !            46:        i16_fill_gdt_descriptor(&cpu[0], KERNEL_16_CS,
        !            47:                                boot_image_pa, 0xffff,
        !            48:                                ACC_PL_K|ACC_CODE_R, SZ_16);
        !            49:        i16_fill_gdt_descriptor(&cpu[0], KERNEL_16_DS,
        !            50:                                boot_image_pa, 0xffff,
        !            51:                                ACC_PL_K|ACC_DATA_W, SZ_16);
        !            52: }
        !            53: 

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