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Annotation of Gnu-Mach/i386/util/gdt.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !             4:  * Copyright (c) 1991 IBM Corporation 
        !             5:  * All Rights Reserved.
        !             6:  * 
        !             7:  * Permission to use, copy, modify and distribute this software and its
        !             8:  * documentation is hereby granted, provided that both the copyright
        !             9:  * notice and this permission notice appear in all copies of the
        !            10:  * software, derivative works or modified versions, and any portions
        !            11:  * thereof, and that both notices appear in supporting documentation,
        !            12:  * and that the name IBM not be used in advertising or publicity 
        !            13:  * pertaining to distribution of the software without specific, written
        !            14:  * prior permission.
        !            15:  * 
        !            16:  * CARNEGIE MELLON AND IBM ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            17:  * CONDITION.  CARNEGIE MELLON AND IBM DISCLAIM ANY LIABILITY OF ANY KIND FOR
        !            18:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            19:  * 
        !            20:  * Carnegie Mellon requests users of this software to return to
        !            21:  * 
        !            22:  *  Software Distribution Coordinator  or  [email protected]
        !            23:  *  School of Computer Science
        !            24:  *  Carnegie Mellon University
        !            25:  *  Pittsburgh PA 15213-3890
        !            26:  * 
        !            27:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            28:  * the rights to redistribute these changes.
        !            29:  */
        !            30: 
        !            31: #include "cpu.h"
        !            32: #include "vm_param.h"
        !            33: 
        !            34: 
        !            35: /* Initialize the 32-bit kernel code and data segment descriptors
        !            36:    to point to the base of the kernel linear space region.  */
        !            37: gdt_desc_initializer(KERNEL_CS,
        !            38:                     kvtolin(0), 0xffffffff,
        !            39:                     ACC_PL_K|ACC_CODE_R, SZ_32);
        !            40: gdt_desc_initializer(KERNEL_DS,
        !            41:                     kvtolin(0), 0xffffffff,
        !            42:                     ACC_PL_K|ACC_DATA_W, SZ_32);
        !            43: 
        !            44: /* Initialize the 16-bit real-mode code and data segment descriptors. */
        !            45: gdt_desc_initializer(KERNEL_16_CS,
        !            46:                     kvtolin(0), 0xffff,
        !            47:                     ACC_PL_K|ACC_CODE_R, SZ_16);
        !            48: gdt_desc_initializer(KERNEL_16_DS,
        !            49:                     kvtolin(0), 0xffff,
        !            50:                     ACC_PL_K|ACC_DATA_W, SZ_16);
        !            51: 
        !            52: /* Initialize the linear-space data segment descriptor. */
        !            53: gdt_desc_initializer(LINEAR_CS,
        !            54:                     0, 0xffffffff,
        !            55:                     ACC_PL_K|ACC_CODE_R, SZ_32);
        !            56: gdt_desc_initializer(LINEAR_DS,
        !            57:                     0, 0xffffffff,
        !            58:                     ACC_PL_K|ACC_DATA_W, SZ_32);
        !            59: 
        !            60: /* Initialize the master LDT and TSS descriptors.  */
        !            61: #ifdef ENABLE_KERNEL_LDT
        !            62: gdt_desc_initializer(KERNEL_LDT,
        !            63:                     kvtolin(&cpu->tables.ldt), sizeof(cpu->tables.ldt)-1,
        !            64:                     ACC_PL_K|ACC_LDT, 0);
        !            65: #endif
        !            66: #ifdef ENABLE_KERNEL_TSS
        !            67: gdt_desc_initializer(KERNEL_TSS,
        !            68:                     kvtolin(&cpu->tables.tss), sizeof(cpu->tables.tss)-1,
        !            69:                     ACC_PL_K|ACC_TSS, 0);
        !            70: #endif
        !            71: 
        !            72: 
        !            73: void cpu_gdt_init(struct cpu *cpu)
        !            74: {
        !            75:        /* Initialize all the selectors of the GDT.  */
        !            76: #define gdt_sel(name) cpu_gdt_init_##name(cpu);
        !            77: #include "gdt_sels.h"
        !            78: #undef gdt_sel
        !            79: }
        !            80: 

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