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 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 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 [email protected] 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 (¤t_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_ */ 134