Return to real_tss.c CVS log

Up to [GnuMach] / Gnu-Mach / i386 / pc

Annotation of Gnu-Mach/i386/pc/real_tss.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/tss.h>
                     25: #include <mach/machine/proc_reg.h>
                     26: 
                     27: #include "cpu.h"
                     28: #include "real_tss.h"
                     29: #include "vm_param.h"
                     30: #include "config.h"
                     31: 
                     32: #ifdef ENABLE_REAL_TSS
                     33: 
                     34: static void real_tss_init()
                     35: {
                     36:        /* Only initialize once.  */
                     37:        if (!real_tss.ss0)
                     38:        {
                     39:                /* Initialize the real-mode TSS.  */
                     40:                real_tss.ss0 = KERNEL_DS;
                     41:                real_tss.esp0 = get_esp();
                     42:                real_tss.io_bit_map_offset = sizeof(real_tss);
                     43: 
                     44:                /* Set the last byte in the I/O bitmap to all 1's.  */
                     45:                ((unsigned char*)&real_tss)[REAL_TSS_SIZE] = 0xff;
                     46:        }
                     47: }
                     48: 
                     49: void
                     50: cpu_gdt_init_REAL_TSS(struct cpu *cpu)
                     51: {
                     52:        real_tss_init();
                     53: 
                     54:        fill_gdt_descriptor(cpu, REAL_TSS,
                     55:                            kvtolin(&real_tss), REAL_TSS_SIZE-1,
                     56:                            ACC_PL_K|ACC_TSS, 0);
                     57: }
                     58: 
                     59: #endif ENABLE_REAL_TSS

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.