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Annotation of Gnu-Mach/i386/util/cpu_tables_load.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/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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