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 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 <mach_kdb.h> 64#include <sys/cdefs.h> 65 66__BEGIN_DECLS 67 68/* 69 * Multiprocessor i386/i486 systems use a separate copy of the 70 * GDT, IDT, LDT, and kernel TSS per processor. The first three 71 * are separate to avoid lock contention: the i386 uses locked 72 * memory cycles to access the descriptor tables. The TSS is 73 * separate since each processor needs its own kernel stack, 74 * and since using a TSS marks it busy. 75 */ 76 77#include <i386/seg.h> 78#include <i386/tss.h> 79 80/* 81 * The descriptor tables are together in a structure 82 * allocated one per processor (except for the boot processor). 83 * Note that dbtss could be conditionalized on MACH_KDB, but 84 * doing so increases misconfiguration risk. 85 */ 86typedef struct cpu_desc_table { 87 struct fake_descriptor idt[IDTSZ] __attribute__ ((aligned (16))); 88 struct fake_descriptor gdt[GDTSZ] __attribute__ ((aligned (16))); 89 struct i386_tss ktss __attribute__ ((aligned (16))); 90 struct i386_tss dbtss __attribute__ ((aligned (16))); 91 struct sysenter_stack sstk; 92} cpu_desc_table_t; 93 94typedef struct cpu_desc_table64 { 95 struct fake_descriptor64 idt[IDTSZ] __attribute__ ((aligned (16))); 96 struct fake_descriptor gdt[GDTSZ] __attribute__ ((aligned (16))); 97 struct x86_64_tss ktss __attribute__ ((aligned (16))); 98 struct sysenter_stack sstk __attribute__ ((aligned (16))); 99 uint8_t dfstk[PAGE_SIZE] __attribute__ ((aligned (16))); 100} cpu_desc_table64_t; 101 102#define current_gdt() (current_cpu_datap()->cpu_desc_index.cdi_gdt) 103#define current_idt() (current_cpu_datap()->cpu_desc_index.cdi_idt) 104#define current_ldt() (current_cpu_datap()->cpu_desc_index.cdi_ldt) 105#define current_ktss() (current_cpu_datap()->cpu_desc_index.cdi_ktss) 106#define current_dbtss() (current_cpu_datap()->cpu_desc_index.cdi_dbtss) 107#define current_sstk() (current_cpu_datap()->cpu_desc_index.cdi_sstk) 108 109#define current_ktss64() ((struct x86_64_tss *) current_ktss()) 110#define current_sstk64() ((addr64_t *) current_sstk()) 111 112#define gdt_desc_p(sel) \ 113 ((struct real_descriptor *)¤t_gdt()[sel_idx(sel)]) 114#define ldt_desc_p(sel) \ 115 ((struct real_descriptor *)¤t_ldt()[sel_idx(sel)]) 116 117extern void cpu_desc_init( 118 cpu_data_t *cdp, 119 boolean_t is_boot_cpu); 120extern void cpu_desc_init64( 121 cpu_data_t *cdp, 122 boolean_t is_boot_cpu); 123extern void cpu_desc_load64( 124 cpu_data_t *cdp); 125extern void cpu_mode_init( 126 cpu_data_t *cdp); 127 128static inline boolean_t 129valid_user_data_selector(uint16_t selector) 130{ 131 sel_t sel = selector_to_sel(selector); 132 133 if (selector == 0) 134 return (TRUE); 135 136 if (sel.ti == SEL_LDT) 137 return (TRUE); 138 else if (sel.index < GDTSZ) { 139 if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) 140 return (TRUE); 141 } 142 143 return (FALSE); 144} 145 146static inline boolean_t 147valid_user_code_selector(uint16_t selector) 148{ 149 sel_t sel = selector_to_sel(selector); 150 151 if (selector == 0) 152 return (FALSE); 153 154 if (sel.ti == SEL_LDT) { 155 if (sel.rpl == USER_PRIV) 156 return (TRUE); 157 } 158 else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { 159 if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) 160 return (TRUE); 161 } 162 163 return (FALSE); 164} 165 166static inline boolean_t 167valid_user_stack_selector(uint16_t selector) 168{ 169 sel_t sel = selector_to_sel(selector); 170 171 if (selector == 0) 172 return (FALSE); 173 174 if (sel.ti == SEL_LDT) { 175 if (sel.rpl == USER_PRIV) 176 return (TRUE); 177 } 178 else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { 179 if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) 180 return (TRUE); 181 } 182 183 return (FALSE); 184} 185 186extern boolean_t 187valid_user_segment_selectors(uint16_t cs, 188 uint16_t ss, 189 uint16_t ds, 190 uint16_t es, 191 uint16_t fs, 192 uint16_t gs); 193 194__END_DECLS 195 196#endif /* _I386_MP_DESC_H_ */ 197