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Annotation of XNU/osfmk/i386/gdt.c, 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: /* CMU_ENDHIST */
        !            26: /* 
        !            27:  * Mach Operating System
        !            28:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !            29:  * All Rights Reserved.
        !            30:  * 
        !            31:  * Permission to use, copy, modify and distribute this software and its
        !            32:  * documentation is hereby granted, provided that both the copyright
        !            33:  * notice and this permission notice appear in all copies of the
        !            34:  * software, derivative works or modified versions, and any portions
        !            35:  * thereof, and that both notices appear in supporting documentation.
        !            36:  * 
        !            37:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            38:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            39:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            40:  * 
        !            41:  * Carnegie Mellon requests users of this software to return to
        !            42:  * 
        !            43:  *  Software Distribution Coordinator  or  [email protected]
        !            44:  *  School of Computer Science
        !            45:  *  Carnegie Mellon University
        !            46:  *  Pittsburgh PA 15213-3890
        !            47:  * 
        !            48:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            49:  * the rights to redistribute these changes.
        !            50:  */
        !            51: /*
        !            52:  */
        !            53: 
        !            54: /*
        !            55:  * Global descriptor table.
        !            56:  */
        !            57: #include <i386/thread.h>
        !            58: #include <i386/seg.h>
        !            59: #include <mach/i386/vm_param.h>
        !            60: #include <kern/thread.h>
        !            61: #include <mach_kdb.h>
        !            62: 
        !            63: #ifdef MACH_BSD
        !            64: extern int     trap_unix_syscall(void), trap_mach25_syscall(void),
        !            65:                trap_machdep_syscall(void), syscall(void);
        !            66: #endif
        !            67: 
        !            68: struct fake_descriptor gdt[GDTSZ] = {
        !            69: /* 0x000 */    { 0, 0, 0, 0 },         /* always NULL */
        !            70: /* 0x008 */    { LINEAR_KERNEL_ADDRESS + VM_MIN_ADDRESS,
        !            71:                  (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_KERNEL_ADDRESS)>>12,
        !            72:                  SZ_32|SZ_G,
        !            73:                  ACC_P|ACC_PL_K|ACC_CODE_R
        !            74:                },                      /* kernel code */
        !            75: /* 0x010 */    { LINEAR_KERNEL_ADDRESS + VM_MIN_ADDRESS,
        !            76:                  (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_KERNEL_ADDRESS)>>12,
        !            77:                  SZ_32|SZ_G,
        !            78:                  ACC_P|ACC_PL_K|ACC_DATA_W
        !            79:                },                      /* kernel data */
        !            80: /* 0x018 */    { LINEAR_KERNEL_ADDRESS + (unsigned int)ldt,
        !            81:                  LDTSZ*sizeof(struct fake_descriptor)-1,
        !            82:                  0,
        !            83:                  ACC_P|ACC_PL_K|ACC_LDT
        !            84:                },                      /* local descriptor table */
        !            85: /* 0x020 */    { LINEAR_KERNEL_ADDRESS + (unsigned int)&ktss,
        !            86:                  sizeof(struct i386_tss)-1,
        !            87:                  0,
        !            88:                  ACC_P|ACC_PL_K|ACC_TSS
        !            89:                },                      /* TSS for this processor */
        !            90: #ifdef MACH_BSD
        !            91: /* 0x28 */     { (unsigned int) &trap_unix_syscall,
        !            92:                   KERNEL_CS,
        !            93:                   0,                           /* no parameters */
        !            94:                   ACC_P|ACC_PL_U|ACC_CALL_GATE
        !            95:                },
        !            96: /* 0x30 */     { (unsigned int) &trap_mach25_syscall,
        !            97:                   KERNEL_CS,
        !            98:                   0,                           /* no parameters */
        !            99:                   ACC_P|ACC_PL_U|ACC_CALL_GATE
        !           100:                },
        !           101: /* 0x38 */     { (unsigned int) &trap_machdep_syscall,
        !           102:                   KERNEL_CS,
        !           103:                   0,                           /* no parameters */
        !           104:                   ACC_P|ACC_PL_U|ACC_CALL_GATE
        !           105:                },
        !           106: #else
        !           107: /* 0x028 */    { 0, 0, 0, 0 },         /* per-thread LDT */
        !           108: /* 0x030 */    { 0, 0, 0, 0 },         /* per-thread TSS for IO bitmap */
        !           109: /* 0x038 */    { 0, 0, 0, 0 },
        !           110: #endif
        !           111: /* 0x040 */    { 0, 0, 0, 0 },
        !           112: /* 0x048 */    { LINEAR_KERNEL_ADDRESS + (unsigned int)&cpu_data[0],
        !           113:                  sizeof(cpu_data)-1,
        !           114:                  SZ_32,
        !           115:                  ACC_P|ACC_PL_K|ACC_DATA_W
        !           116:                },                      /* per-CPU current thread address */
        !           117: #if    MACH_KDB
        !           118: /* 0x050 */    { LINEAR_KERNEL_ADDRESS + (unsigned int)&dbtss,
        !           119:                  sizeof(struct i386_tss)-1,
        !           120:                  0,
        !           121:                  ACC_P|ACC_PL_K|ACC_TSS
        !           122:                }                       /* TSS for this processor */
        !           123: #endif /* MACH_KDB */
        !           124: };

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