osfmk/i386/tss.h

   1 /*
   2  * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_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 License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58
  59 #ifndef _I386_TSS_H_
  60 #define _I386_TSS_H_
  61
  62 #include <stdint.h>
  63
  64 /*
  65  *      i386 Task State Segment
  66  */
  67 struct i386_tss {
  68         uint32_t        back_link;      /* segment number of previous task,
  69                                            if nested */
  70         uint32_t        esp0;           /* initial stack pointer ... */
  71         uint32_t        ss0;            /* and segment for ring 0 */
  72         uint32_t        esp1;           /* initial stack pointer ... */
  73         uint32_t        ss1;            /* and segment for ring 1 */
  74         uint32_t        esp2;           /* initial stack pointer ... */
  75         uint32_t        ss2;            /* and segment for ring 2 */
  76         uint32_t        cr3;            /* CR3 - page table directory
  77                                                  physical address */
  78         uint32_t        eip;
  79         uint32_t        eflags;
  80         uint32_t        eax;
  81         uint32_t        ecx;
  82         uint32_t        edx;
  83         uint32_t        ebx;
  84         uint32_t        esp;            /* current stack pointer */
  85         uint32_t        ebp;
  86         uint32_t        esi;
  87         uint32_t        edi;
  88         uint32_t        es;
  89         uint32_t        cs;
  90         uint32_t        ss;             /* current stack segment */
  91         uint32_t        ds;
  92         uint32_t        fs;
  93         uint32_t        gs;
  94         uint32_t        ldt;            /* local descriptor table segment */
  95         uint16_t        trace_trap;     /* trap on switch to this task */
  96         uint16_t        io_bit_map_offset;
  97                                         /* offset to start of IO permission
  98                                            bit map */
  99 };
 100
 101 /*
 102  * Temporary stack used on kernel entry via the sysenter instruction.
 103  * Its top points on to the PCB save area. It must contain space for
 104  * a single interrupt stack frame in case of single-stepping over the sysenter.
 105  * Although this is defined as a 64-bit stack, the space is also used in
 106  * 32-bit legacy mode. For 64-bit the stack is 16-byte aligned.
 107  */
 108 struct sysenter_stack {
 109         uint64_t        stack[16];      /* Space for a 64-bit frame and some */
 110         uint64_t        top;            /* Top and pointer to ISS in PCS */
 111 };
 112
 113 #pragma pack(4)
 114 struct x86_64_tss {
 115         uint32_t        reserved1;
 116         uint64_t        rsp0;           /* stack pointer for CPL0 */
 117         uint64_t        rsp1;           /* stack pointer for CPL1 */
 118         uint64_t        rsp2;           /* stack pointer for CPL2 */
 119         uint32_t        reserved2;
 120         uint32_t        reserved3;
 121         uint64_t        ist1;           /* interrupt stack table 1 */
 122         uint64_t        ist2;           /* interrupt stack table 2 */
 123         uint64_t        ist3;           /* interrupt stack table 3 */
 124         uint64_t        ist4;           /* interrupt stack table 4 */
 125         uint64_t        ist5;           /* interrupt stack table 5 */
 126         uint64_t        ist6;           /* interrupt stack table 6 */
 127         uint64_t        ist7;           /* interrupt stack table 7 */
 128         uint32_t        reserved4;
 129         uint32_t        reserved5;
 130         uint16_t        reserved6;
 131         uint16_t        io_bit_map_offset;
 132                                         /* offset to IO permission bit map */
 133 };
 134 #pragma pack()
 135 #endif  /* _I386_TSS_H_ */