/* * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* */ #ifndef _I386_MP_DESC_H_ #define _I386_MP_DESC_H_ #include <mach_kdb.h> #include <sys/cdefs.h> __BEGIN_DECLS /* * Multiprocessor i386/i486 systems use a separate copy of the * GDT, IDT, LDT, and kernel TSS per processor. The first three * are separate to avoid lock contention: the i386 uses locked * memory cycles to access the descriptor tables. The TSS is * separate since each processor needs its own kernel stack, * and since using a TSS marks it busy. */ #include <i386/seg.h> #include <i386/tss.h> /* * The descriptor tables are together in a structure * allocated one per processor (except for the boot processor). * Note that dbtss could be conditionalized on MACH_KDB, but * doing so increases misconfiguration risk. */ struct mp_desc_table { struct fake_descriptor idt[IDTSZ]; /* IDT */ struct fake_descriptor gdt[GDTSZ]; /* GDT */ struct fake_descriptor ldt[LDTSZ]; /* LDT */ struct i386_tss ktss; struct i386_tss dbtss; }; #define current_gdt() (current_cpu_datap()->cpu_desc_index.cdi_gdt) #define current_idt() (current_cpu_datap()->cpu_desc_index.cdi_idt) #define current_ldt() (current_cpu_datap()->cpu_desc_index.cdi_ldt) #define current_ktss() (current_cpu_datap()->cpu_desc_index.cdi_ktss) #define current_dbtss() (current_cpu_datap()->cpu_desc_index.cdi_dbtss) #define gdt_desc_p(sel) \ ((struct real_descriptor *)¤t_gdt()[sel_idx(sel)]) #define ldt_desc_p(sel) \ ((struct real_descriptor *)¤t_ldt()[sel_idx(sel)]) extern void mp_desc_init(cpu_data_t *cdp, boolean_t is_boot_cpu); static inline boolean_t valid_user_data_selector(uint16_t selector) { sel_t sel = selector_to_sel(selector); if (selector == 0) return (TRUE); if (sel.ti == SEL_LDT) return (TRUE); else if (sel.index < GDTSZ) { if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) return (TRUE); } return (FALSE); } static inline boolean_t valid_user_code_selector(uint16_t selector) { sel_t sel = selector_to_sel(selector); if (selector == 0) return (FALSE); if (sel.ti == SEL_LDT) { if (sel.rpl == USER_PRIV) return (TRUE); } else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) return (TRUE); } return (FALSE); } static inline boolean_t valid_user_stack_selector(uint16_t selector) { sel_t sel = selector_to_sel(selector); if (selector == 0) return (FALSE); if (sel.ti == SEL_LDT) { if (sel.rpl == USER_PRIV) return (TRUE); } else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) return (TRUE); } return (FALSE); } extern boolean_t valid_user_segment_selectors(uint16_t cs, uint16_t ss, uint16_t ds, uint16_t es, uint16_t fs, uint16_t gs); __END_DECLS #endif /* _I386_MP_DESC_H_ */