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/*
* Copyright (c) 1995-1994 The University of Utah and
* the Computer Systems Laboratory at the University of Utah (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software is hereby
* granted provided that (1) source code retains these copyright, permission,
* and disclaimer notices, and (2) redistributions including binaries
* reproduce the notices in supporting documentation, and (3) all advertising
* materials mentioning features or use of this software display the following
* acknowledgement: ``This product includes software developed by the
* Computer Systems Laboratory at the University of Utah.''
*
* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
* improvements that they make and grant CSL redistribution rights.
*
* Author: Bryan Ford, University of Utah CSL
*/
#include <mach/machine/tss.h>
#include <mach/machine/proc_reg.h>
#include "cpu.h"
#include "real_tss.h"
#include "vm_param.h"
#include "config.h"
#ifdef ENABLE_REAL_TSS
static void real_tss_init()
{
/* Only initialize once. */
if (!real_tss.ss0)
{
/* Initialize the real-mode TSS. */
real_tss.ss0 = KERNEL_DS;
real_tss.esp0 = get_esp();
real_tss.io_bit_map_offset = sizeof(real_tss);
/* Set the last byte in the I/O bitmap to all 1's. */
((unsigned char*)&real_tss)[REAL_TSS_SIZE] = 0xff;
}
}
void
cpu_gdt_init_REAL_TSS(struct cpu *cpu)
{
real_tss_init();
fill_gdt_descriptor(cpu, REAL_TSS,
kvtolin(&real_tss), REAL_TSS_SIZE-1,
ACC_PL_K|ACC_TSS, 0);
}
#endif ENABLE_REAL_TSS
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