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Annotation of XNU/bsd/dev/i386/sel_inline.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:  * Selector value conversion/validation.
        !            26:  *
        !            27:  * HISTORY
        !            28:  *
        !            29:  * 19 June 1992 ? at NeXT
        !            30:  *     Created.
        !            31:  */
        !            32:  
        !            33: #if 0
        !            34: #import <machdep/i386/table_inline.h>
        !            35: #endif
        !            36: 
        !            37: 
        !            38: static inline
        !            39: unsigned int
        !            40: sel_to_selector(
        !            41:     sel_t              sel
        !            42: )
        !            43: {
        !            44:     union {
        !            45:        sel_t           sel;
        !            46:        unsigned short  selector;
        !            47:     } tconv;
        !            48:     
        !            49:     tconv.sel = sel;
        !            50:     
        !            51:     return (tconv.selector);
        !            52: }
        !            53: 
        !            54: static inline
        !            55: sel_t
        !            56: selector_to_sel(
        !            57:     unsigned int       selector
        !            58: )
        !            59: {
        !            60:     union {
        !            61:        unsigned short  selector;
        !            62:        sel_t           sel;
        !            63:     } tconv;
        !            64:     
        !            65:     tconv.selector = selector;
        !            66:     
        !            67:     return (tconv.sel);
        !            68: }
        !            69: 
        !            70: #if 0
        !            71: static inline
        !            72: boolean_t
        !            73: valid_user_data_selector(
        !            74:     unsigned int       selector
        !            75: )
        !            76: {
        !            77:     sel_t              sel = selector_to_sel(selector);
        !            78:     
        !            79:     if (selector == 0)
        !            80:        return (TRUE);
        !            81: 
        !            82:     if (sel.ti == SEL_LDT)
        !            83:        return (TRUE);
        !            84:     else if (sel.index < GDTSZ) {
        !            85:        data_desc_t     *desc = (data_desc_t *)sel_to_gdt_entry(sel);
        !            86:        
        !            87:        if (desc->dpl == USER_PRIV)
        !            88:            return (TRUE);
        !            89:     }
        !            90:                
        !            91:     return (FALSE);
        !            92: }
        !            93: 
        !            94: static inline
        !            95: boolean_t
        !            96: valid_user_code_selector(
        !            97:     unsigned int       selector
        !            98: )
        !            99: {
        !           100:     sel_t              sel = selector_to_sel(selector);
        !           101:     
        !           102:     if (selector == 0)
        !           103:        return (FALSE);
        !           104: 
        !           105:     if (sel.ti == SEL_LDT) {
        !           106:        if (sel.rpl == USER_PRIV)
        !           107:            return (TRUE);
        !           108:     }
        !           109:     else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
        !           110:        code_desc_t     *desc = (code_desc_t *)sel_to_gdt_entry(sel);
        !           111:        
        !           112:        if (desc->dpl == USER_PRIV)
        !           113:            return (TRUE);
        !           114:     }
        !           115: 
        !           116:     return (FALSE);
        !           117: }
        !           118: 
        !           119: static inline
        !           120: boolean_t
        !           121: valid_user_stack_selector(
        !           122:     unsigned int       selector
        !           123: )
        !           124: {
        !           125:     sel_t              sel = selector_to_sel(selector);
        !           126:     
        !           127:     if (selector == 0)
        !           128:        return (FALSE);
        !           129: 
        !           130:     if (sel.ti == SEL_LDT) {
        !           131:        if (sel.rpl == USER_PRIV)
        !           132:            return (TRUE);
        !           133:     }
        !           134:     else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
        !           135:        data_desc_t     *desc = (data_desc_t *)sel_to_gdt_entry(sel);
        !           136:        
        !           137:        if (desc->dpl == USER_PRIV)
        !           138:            return (TRUE);
        !           139:     }
        !           140:                
        !           141:     return (FALSE);
        !           142: }
        !           143: #endif

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