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Annotation of Gnu-Mach/i386/pc/i16/i16_init.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/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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