osfmk/i386/mp_desc.h

   1 /*
   2  * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
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   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,
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  23  * Please see the License for the specific language governing rights and
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990 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
  60 #ifndef _I386_MP_DESC_H_
  61 #define _I386_MP_DESC_H_
  62
  63 #include <sys/cdefs.h>
  64
  65 __BEGIN_DECLS
  66
  67 /*
  68  * Multiprocessor i386/i486 systems use a separate copy of the
  69  * GDT, IDT, LDT, and kernel TSS per processor.  The first three
  70  * are separate to avoid lock contention: the i386 uses locked
  71  * memory cycles to access the descriptor tables.  The TSS is
  72  * separate since each processor needs its own kernel stack,
  73  * and since using a TSS marks it busy.
  74  */
  75
  76 #include <i386/seg.h>
  77 #include <i386/tss.h>
  78
  79 /*
  80  * The descriptor tables are together in a structure
  81  * allocated one per processor (except for the boot processor).
  82  */
  83 #define FSTK_SZ (PAGE_SIZE/2)
  84 typedef struct cpu_desc_table64 {
  85         struct fake_descriptor  gdt[GDTSZ]       __attribute__ ((aligned (16)));
  86         struct x86_64_tss       ktss             __attribute__ ((aligned (16)));
  87         struct sysenter_stack   sstk             __attribute__ ((aligned (16)));
  88         uint8_t                 *fstkp;
  89 } cpu_desc_table64_t;
  90
  91 typedef struct {
  92         uint8_t                 fstk[FSTK_SZ]  __attribute__ ((aligned (16)));
  93 } cpu_fault_stack_t;
  94
  95 #define current_gdt()   (current_cpu_datap()->cpu_desc_index.cdi_gdtb.ptr)
  96 #define current_idt()   (current_cpu_datap()->cpu_desc_index.cdi_idtb.ptr)
  97 #define current_ldt()   (current_cpu_datap()->cpu_desc_index.cdi_ldtb)
  98 #define current_ktss()  (current_cpu_datap()->cpu_desc_index.cdi_ktssb)
  99 #define current_sstk()  (current_cpu_datap()->cpu_desc_index.cdi_sstkb)
 100
 101 #define current_ktss64() ((struct x86_64_tss *) current_ktss())
 102 #define current_sstk64() ((addr64_t *) current_sstk())
 103
 104 #define gdt_desc_p(sel) \
 105         (&((struct real_descriptor *)current_gdt())[sel_idx(sel)])
 106 #define ldt_desc_p(sel) \
 107         (&((struct real_descriptor *)current_ldt())[sel_idx(sel)])
 108
 109 extern void     cpu_syscall_init(cpu_data_t *cdp);
 110
 111 extern void     cpu_desc_init(cpu_data_t *cdp);
 112 extern void     cpu_desc_load(cpu_data_t *cdp);
 113
 114 extern boolean_t
 115 valid_user_data_selector(uint16_t selector);
 116
 117 extern boolean_t
 118 valid_user_code_selector(uint16_t selector);
 119
 120 extern boolean_t
 121 valid_user_stack_selector(uint16_t selector);
 122
 123 extern boolean_t
 124 valid_user_segment_selectors(uint16_t cs,
 125                              uint16_t ss,
 126                              uint16_t ds,
 127                              uint16_t es,
 128                              uint16_t fs,
 129                              uint16_t gs);
 130
 131 __END_DECLS
 132
 133 #endif  /* _X86_64_MP_DESC_H_ */