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Annotation of XNU/EXTERNAL_HEADERS/architecture/i386/tss.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            24:  *
        !            25:  * Intel386 Family:    Task State Segment.
        !            26:  *
        !            27:  * HISTORY
        !            28:  *
        !            29:  * 29 March 1992 ? at NeXT
        !            30:  *     Created.
        !            31:  */
        !            32: 
        !            33: #import <architecture/i386/sel.h>
        !            34: 
        !            35: /*
        !            36:  * Task State segment.
        !            37:  */
        !            38: 
        !            39: typedef struct tss {
        !            40:     sel_t              oldtss;
        !            41:     unsigned int               :0;
        !            42:     unsigned int       esp0;
        !            43:     sel_t              ss0;
        !            44:     unsigned int               :0;
        !            45:     unsigned int       esp1;
        !            46:     sel_t              ss1;
        !            47:     unsigned int               :0;
        !            48:     unsigned int       esp2;
        !            49:     sel_t              ss2;
        !            50:     unsigned int               :0;
        !            51:     unsigned int       cr3;
        !            52:     unsigned int       eip;
        !            53:     unsigned int       eflags;
        !            54:     unsigned int       eax;
        !            55:     unsigned int       ecx;
        !            56:     unsigned int       edx;
        !            57:     unsigned int       ebx;
        !            58:     unsigned int       esp;
        !            59:     unsigned int       ebp;
        !            60:     unsigned int       esi;
        !            61:     unsigned int       edi;
        !            62:     sel_t              es;
        !            63:     unsigned int               :0;
        !            64:     sel_t              cs;
        !            65:     unsigned int               :0;
        !            66:     sel_t              ss;
        !            67:     unsigned int               :0;
        !            68:     sel_t              ds;
        !            69:     unsigned int               :0;
        !            70:     sel_t              fs;
        !            71:     unsigned int               :0;
        !            72:     sel_t              gs;
        !            73:     unsigned int               :0;
        !            74:     sel_t              ldt;
        !            75:     unsigned int               :0;
        !            76:     unsigned int       t       :1,
        !            77:                                :15,
        !            78:                        io_bmap :16;
        !            79: } tss_t;
        !            80: 
        !            81: #define TSS_SIZE(n)    (sizeof (struct tss) + (n))
        !            82: 
        !            83: /*
        !            84:  * Task State segment descriptor.
        !            85:  */
        !            86: 
        !            87: typedef struct tss_desc {
        !            88:     unsigned short     limit00;
        !            89:     unsigned short     base00;
        !            90:     unsigned char      base16;
        !            91:     unsigned char      type    :5,
        !            92: #define DESC_TSS       0x09
        !            93:                        dpl     :2,
        !            94:                        present :1;
        !            95:     unsigned char      limit16 :4,
        !            96:                                :3,
        !            97:                        granular:1;
        !            98:     unsigned char      base24;
        !            99: } tss_desc_t;
        !           100: 
        !           101: /*
        !           102:  * Task gate descriptor.
        !           103:  */
        !           104:  
        !           105: typedef struct task_gate {
        !           106:     unsigned short             :16;
        !           107:     sel_t              tss;
        !           108:     unsigned int               :8,
        !           109:                        type    :5,
        !           110: #define DESC_TASK_GATE 0x05
        !           111:                        dpl     :2,
        !           112:                        present :1,
        !           113:                                :0;
        !           114: } task_gate_t;

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