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Annotation of Gnu-Mach/i386/util/cpu_tables_load.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/proc_reg.h>
                     25: 
                     26: #include "cpu.h"
                     27: #include "vm_param.h"
                     28: 
                     29: void cpu_tables_load(struct cpu *cpu)
                     30: {
                     31:        struct pseudo_descriptor pdesc;
                     32: 
                     33:        /* Load the final GDT.
                     34:           If paging is now on,
                     35:           then this will point the processor to the GDT
                     36:           at its new linear address in the kernel linear space.  */
                     37:        pdesc.limit = sizeof(cpu->tables.gdt)-1;
                     38:        pdesc.linear_base = kvtolin(&cpu->tables.gdt);
                     39:        set_gdt(&pdesc);
                     40: 
                     41:        /* Reload all the segment registers from the new GDT.  */
                     42:        asm volatile("
                     43:                ljmp    %0,$1f
                     44:        1:
                     45:        " : : "i" (KERNEL_CS));
                     46:        set_ds(KERNEL_DS);
                     47:        set_es(KERNEL_DS);
                     48:        set_fs(0);
                     49:        set_gs(0);
                     50:        set_ss(KERNEL_DS);
                     51: 
                     52:        /* Load the IDT.  */
                     53:        pdesc.limit = sizeof(cpu[0].tables.idt)-1;
                     54:        pdesc.linear_base = kvtolin(&cpu->tables.idt);
                     55:        set_idt(&pdesc);
                     56: 
                     57: #ifdef DEFAULT_LDT
                     58:        /* Load the default LDT.  */
                     59:        set_ldt(DEFAULT_LDT);
                     60: #endif
                     61: 
                     62: #ifdef DEFAULT_TSS
                     63:        /* Make sure it isn't marked busy.  */
                     64:        cpu->tables.gdt[DEFAULT_TSS_IDX].access &= ~ACC_TSS_BUSY;
                     65: 
                     66:        /* Load the default TSS.  */
                     67:        set_tr(DEFAULT_TSS);
                     68: #endif
                     69: }
                     70: 

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