osfmk/i386/tss.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * Mach Operating System
  35  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  36  * All Rights Reserved.
  37  *
  38  * Permission to use, copy, modify and distribute this software and its
  39  * documentation is hereby granted, provided that both the copyright
  40  * notice and this permission notice appear in all copies of the
  41  * software, derivative works or modified versions, and any portions
  42  * thereof, and that both notices appear in supporting documentation.
  43  *
  44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  46  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  47  *
  48  * Carnegie Mellon requests users of this software to return to
  49  *
  50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  51  *  School of Computer Science
  52  *  Carnegie Mellon University
  53  *  Pittsburgh PA 15213-3890
  54  *
  55  * any improvements or extensions that they make and grant Carnegie Mellon
  56  * the rights to redistribute these changes.
  57  */
  58 /*
  59  */
  60
  61 #ifndef _I386_TSS_H_
  62 #define _I386_TSS_H_
  63
  64 #include <stdint.h>
  65
  66 /*
  67  *      i386 Task State Segment
  68  */
  69 struct i386_tss {
  70         uint32_t        back_link;      /* segment number of previous task,
  71                                            if nested */
  72         uint32_t        esp0;           /* initial stack pointer ... */
  73         uint32_t        ss0;            /* and segment for ring 0 */
  74         uint32_t        esp1;           /* initial stack pointer ... */
  75         uint32_t        ss1;            /* and segment for ring 1 */
  76         uint32_t        esp2;           /* initial stack pointer ... */
  77         uint32_t        ss2;            /* and segment for ring 2 */
  78         uint32_t        cr3;            /* CR3 - page table directory
  79                                                  physical address */
  80         uint32_t        eip;
  81         uint32_t        eflags;
  82         uint32_t        eax;
  83         uint32_t        ecx;
  84         uint32_t        edx;
  85         uint32_t        ebx;
  86         uint32_t        esp;            /* current stack pointer */
  87         uint32_t        ebp;
  88         uint32_t        esi;
  89         uint32_t        edi;
  90         uint32_t        es;
  91         uint32_t        cs;
  92         uint32_t        ss;             /* current stack segment */
  93         uint32_t        ds;
  94         uint32_t        fs;
  95         uint32_t        gs;
  96         uint32_t        ldt;            /* local descriptor table segment */
  97         uint16_t        trace_trap;     /* trap on switch to this task */
  98         uint16_t        io_bit_map_offset;
  99                                         /* offset to start of IO permission
 100                                            bit map */
 101 };
 102
 103 /*
 104  * Temporary stack used on kernel entry via the sysenter instruction.
 105  * Its top points on to the PCB save area. It must contain space for
 106  * a single interrupt stack frame in case of single-stepping over the sysenter.
 107  * Although this is defined as a 64-bit stack, the space is also used in
 108  * 32-bit legacy mode. For 64-bit the stack is 16-byte aligned.
 109  */
 110 struct sysenter_stack {
 111         uint64_t        stack[16];      /* Space for a 64-bit frame and some */
 112         uint64_t        top;            /* Top and pointer to ISS in PCS */
 113 };
 114
 115 struct x86_64_tss {
 116         uint32_t        reserved1;
 117         uint64_t        rsp0;           /* stack pointer for CPL0 */
 118         uint64_t        rsp1;           /* stack pointer for CPL1 */
 119         uint64_t        rsp2;           /* stack pointer for CPL2 */
 120         uint32_t        reserved2;
 121         uint32_t        reserved3;
 122         uint64_t        ist1;           /* interrupt stack table 1 */
 123         uint64_t        ist2;           /* interrupt stack table 2 */
 124         uint64_t        ist3;           /* interrupt stack table 3 */
 125         uint64_t        ist4;           /* interrupt stack table 4 */
 126         uint64_t        ist5;           /* interrupt stack table 5 */
 127         uint64_t        ist6;           /* interrupt stack table 6 */
 128         uint64_t        ist7;           /* interrupt stack table 7 */
 129         uint32_t        reserved4;
 130         uint32_t        reserved5;
 131         uint16_t        reserved6;
 132         uint16_t        io_bit_map_offset;
 133                                         /* offset to IO permission bit map */
 134 };
 135 #endif  /* _I386_TSS_H_ */