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Annotation of Gnu-Mach/i386/pc/i16/i16_init.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/proc_reg.h>
        !            26: 
        !            27: #include "vm_param.h"
        !            28: 
        !            29: 
        !            30: /* Code segment we originally had when we started in real mode.  */
        !            31: unsigned short real_cs;
        !            32: 
        !            33: /* Virtual address of physical memory.  */
        !            34: vm_offset_t phys_mem_va;
        !            35: 
        !            36: /* Physical address of start of boot image.  */
        !            37: vm_offset_t boot_image_pa;
        !            38: 
        !            39: /* Upper limit of known physical memory.  */
        !            40: vm_offset_t phys_mem_max;
        !            41: 
        !            42: 
        !            43: CODE16
        !            44: 
        !            45: #include "i16_bios.h"
        !            46: 
        !            47: /* Called by i16_crt0 (or the equivalent)
        !            48:    to set up our basic 16-bit runtime environment
        !            49:    before calling i16_main().  */
        !            50: void i16_init(void)
        !            51: {
        !            52:        /* Find our code/data/everything segment.  */
        !            53:        real_cs = get_cs();
        !            54: 
        !            55:        /* Find out where in physical memory we got loaded.  */
        !            56:        boot_image_pa = real_cs << 4;
        !            57: 
        !            58:        /* Find out where the bottom of physical memory is.
        !            59:           (We won't be able to directly use it for 32-bit accesses
        !            60:           until we actually get into 32-bit mode.)  */
        !            61:        phys_mem_va = -boot_image_pa;
        !            62: 
        !            63:        /* The base of linear memory is at the same place,
        !            64:           at least until we turn paging on.  */
        !            65:        linear_base_va = phys_mem_va;
        !            66: }
        !            67: 

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