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Annotation of Gnu-Mach/i386/util/i16/i16_gdt_init_temp.c, revision 1.1.1.1

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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