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Annotation of Gnu-Mach/i386/pc/real_tss.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/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

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