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Annotation of XNU/osfmk/i386/seg.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:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /*
        !            51:  */
        !            52: 
        !            53: #ifndef        _I386_SEG_H_
        !            54: #define        _I386_SEG_H_
        !            55: #include <mach_kdb.h>
        !            56: 
        !            57: /*
        !            58:  * i386 segmentation.
        !            59:  */
        !            60: 
        !            61: #ifndef        __ASSEMBLER__
        !            62: /*
        !            63:  * Real segment descriptor.
        !            64:  */
        !            65: struct real_descriptor {
        !            66:        unsigned int    limit_low:16,   /* limit 0..15 */
        !            67:                        base_low:16,    /* base  0..15 */
        !            68:                        base_med:8,     /* base  16..23 */
        !            69:                        access:8,       /* access byte */
        !            70:                        limit_high:4,   /* limit 16..19 */
        !            71:                        granularity:4,  /* granularity */
        !            72:                        base_high:8;    /* base 24..31 */
        !            73: };
        !            74: 
        !            75: struct real_gate {
        !            76:        unsigned int    offset_low:16,  /* offset 0..15 */
        !            77:                        selector:16,
        !            78:                        word_count:8,
        !            79:                        access:8,
        !            80:                        offset_high:16; /* offset 16..31 */
        !            81: };
        !            82: 
        !            83: /*
        !            84:  * We build descriptors and gates in a 'fake' format to let the
        !            85:  * fields be contiguous.  We shuffle them into the real format
        !            86:  * at runtime.
        !            87:  */
        !            88: struct fake_descriptor {
        !            89:        unsigned int    offset:32;              /* offset */
        !            90:        unsigned int    lim_or_seg:20;          /* limit */
        !            91:                                                /* or segment, for gate */
        !            92:        unsigned int    size_or_wdct:4;         /* size/granularity */
        !            93:                                                /* word count, for gate */
        !            94:        unsigned int    access:8;               /* access */
        !            95: };
        !            96: #endif /*__ASSEMBLER__*/
        !            97: 
        !            98: #define        SZ_32           0x4                     /* 32-bit segment */
        !            99: #define        SZ_G            0x8                     /* 4K limit field */
        !           100: 
        !           101: #define        ACC_A           0x01                    /* accessed */
        !           102: #define        ACC_TYPE        0x1e                    /* type field: */
        !           103: 
        !           104: #define        ACC_TYPE_SYSTEM 0x00                    /* system descriptors: */
        !           105: 
        !           106: #define        ACC_LDT         0x02                        /* LDT */
        !           107: #define        ACC_CALL_GATE_16 0x04                       /* 16-bit call gate */
        !           108: #define        ACC_TASK_GATE   0x05                        /* task gate */
        !           109: #define        ACC_TSS         0x09                        /* task segment */
        !           110: #define        ACC_CALL_GATE   0x0c                        /* call gate */
        !           111: #define        ACC_INTR_GATE   0x0e                        /* interrupt gate */
        !           112: #define        ACC_TRAP_GATE   0x0f                        /* trap gate */
        !           113: 
        !           114: #define        ACC_TSS_BUSY    0x02                        /* task busy */
        !           115: 
        !           116: #define        ACC_TYPE_USER   0x10                    /* user descriptors */
        !           117: 
        !           118: #define        ACC_DATA        0x10                        /* data */
        !           119: #define        ACC_DATA_W      0x12                        /* data, writable */
        !           120: #define        ACC_DATA_E      0x14                        /* data, expand-down */
        !           121: #define        ACC_DATA_EW     0x16                        /* data, expand-down,
        !           122:                                                             writable */
        !           123: #define        ACC_CODE        0x18                        /* code */
        !           124: #define        ACC_CODE_R      0x1a                        /* code, readable */
        !           125: #define        ACC_CODE_C      0x1c                        /* code, conforming */
        !           126: #define        ACC_CODE_CR     0x1e                        /* code, conforming,
        !           127:                                                       readable */
        !           128: #define        ACC_PL          0x60                    /* access rights: */
        !           129: #define        ACC_PL_K        0x00                    /* kernel access only */
        !           130: #define        ACC_PL_U        0x60                    /* user access */
        !           131: #define        ACC_P           0x80                    /* segment present */
        !           132: 
        !           133: /*
        !           134:  * Components of a selector
        !           135:  */
        !           136: #define        SEL_LDTS        0x04                    /* local selector */
        !           137: #define        SEL_PL          0x03                    /* privilege level: */
        !           138: #define        SEL_PL_K        0x00                        /* kernel selector */
        !           139: #define        SEL_PL_U        0x03                        /* user selector */
        !           140: 
        !           141: /*
        !           142:  * Convert selector to descriptor table index.
        !           143:  */
        !           144: #define        sel_idx(sel)    ((sel)>>3)
        !           145: 
        !           146: /*
        !           147:  * User descriptors for MACH - 32-bit flat address space
        !           148:  */
        !           149: #define        USER_SCALL      0x07            /* system call gate */
        !           150: #define        USER_RPC        0x0f            /* mach rpc call gate */
        !           151: #define        USER_CS         0x17            /* user code segment */
        !           152: #define        USER_DS         0x1f            /* user data segment */
        !           153: 
        !           154: #define        LDTSZ           4
        !           155: 
        !           156: /*
        !           157:  * Kernel descriptors for MACH - 32-bit flat address space.
        !           158:  */
        !           159: #define        KERNEL_CS       0x08            /* kernel code */
        !           160: #define        KERNEL_DS       0x10            /* kernel data */
        !           161: #define        KERNEL_LDT      0x18            /* master LDT */
        !           162: #define        KERNEL_TSS      0x20            /* master TSS (uniprocessor) */
        !           163: #ifdef MACH_BSD
        !           164: #define        BSD_SCALL_SEL   0x28            /* BSD System calls */
        !           165: #define        MK25_SCALL_SEL  0x30            /* MK25 System Calls */
        !           166: #define        MACHDEP_SCALL_SEL 0x38          /* Machdep SYstem calls */
        !           167: #else
        !           168: #define        USER_LDT        0x28            /* place for per-thread LDT */
        !           169: #define        USER_TSS        0x30            /* place for per-thread TSS
        !           170:                                           that holds IO bitmap */
        !           171: #define        FPE_CS          0x38            /* floating-point emulator code */
        !           172: #endif
        !           173: #define        USER_FPREGS     0x40            /* user-mode access to saved
        !           174:                                           floating-point registers */
        !           175: #define        CPU_DATA        0x48            /* per-cpu data */
        !           176: 
        !           177: #ifdef MACH_BSD
        !           178: #define        USER_LDT        0x58
        !           179: #define        USER_TSS        0x60
        !           180: #define        FPE_CS          0x68
        !           181: #endif
        !           182: 
        !           183: #if    MACH_KDB
        !           184: #define        DEBUG_TSS       0x50            /* debug TSS (uniprocessor) */
        !           185: 
        !           186: #ifdef MACH_BSD
        !           187: #define        GDTSZ           14
        !           188: #else
        !           189: #define        GDTSZ           11
        !           190: #endif
        !           191: #else
        !           192: 
        !           193: #ifdef MACH_BSD
        !           194: #define        GDTSZ           13
        !           195: #else
        !           196: #define        GDTSZ           10
        !           197: #endif
        !           198: #endif
        !           199: 
        !           200: /*
        !           201:  * Interrupt table is always 256 entries long.
        !           202:  */
        !           203: #define        IDTSZ           256
        !           204: 
        !           205: #endif /* _I386_SEG_H_ */

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