[apple/xnu.git] / osfmk / i386 / mp_desc.h

/*
 * Copyright (c) 2000-2006 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.
 */
typedef struct cpu_desc_table {
	struct fake_descriptor	idt[IDTSZ] __attribute__ ((aligned (16)));
	struct fake_descriptor	gdt[GDTSZ] __attribute__ ((aligned (16)));
	struct i386_tss		ktss       __attribute__ ((aligned (16)));
	struct i386_tss		dbtss      __attribute__ ((aligned (16)));
	struct sysenter_stack	sstk;
} cpu_desc_table_t;

typedef struct cpu_desc_table64 {
	struct fake_descriptor64 idt[IDTSZ]      __attribute__ ((aligned (16)));
	struct fake_descriptor	gdt[GDTSZ]       __attribute__ ((aligned (16)));
	struct x86_64_tss	ktss             __attribute__ ((aligned (16)));
	struct sysenter_stack	sstk	         __attribute__ ((aligned (16)));
	uint8_t			dfstk[PAGE_SIZE] __attribute__ ((aligned (16)));
} cpu_desc_table64_t;

#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	current_sstk()	(current_cpu_datap()->cpu_desc_index.cdi_sstk)

#define	current_ktss64() ((struct x86_64_tss *) current_ktss())
#define	current_sstk64() ((addr64_t *) current_sstk())

#define	gdt_desc_p(sel) \
	((struct real_descriptor *)&current_gdt()[sel_idx(sel)])
#define	ldt_desc_p(sel) \
	((struct real_descriptor *)&current_ldt()[sel_idx(sel)])

extern void	cpu_desc_init(
			cpu_data_t	*cdp,
			boolean_t	is_boot_cpu);
extern void	cpu_desc_init64(
			cpu_data_t	*cdp,
			boolean_t	is_boot_cpu);
extern void	cpu_desc_load64(
			cpu_data_t	*cdp);
extern void	cpu_mode_init(
			cpu_data_t	*cdp);

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_ */
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
1c79356b	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	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.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	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
1c79356b	63	#include <mach_kdb.h>
91447636 A	64	#include <sys/cdefs.h>
	65
	66	__BEGIN_DECLS
1c79356b A	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	*/
0c530ab8 A	86	typedef 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
	94	typedef 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;
1c79356b	101
91447636 A	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)
0c530ab8 A	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())
1c79356b	111
91447636 A	112	#define gdt_desc_p(sel) \
	113	((struct real_descriptor *)&current_gdt()[sel_idx(sel)])
	114	#define ldt_desc_p(sel) \
	115	((struct real_descriptor *)&current_ldt()[sel_idx(sel)])
1c79356b	116
0c530ab8 A	117	extern void cpu_desc_init(
	118	cpu_data_t *cdp,
	119	boolean_t is_boot_cpu);
	120	extern void cpu_desc_init64(
	121	cpu_data_t *cdp,
	122	boolean_t is_boot_cpu);
	123	extern void cpu_desc_load64(
	124	cpu_data_t *cdp);
2d21ac55 A	125	extern void cpu_mode_init(
2d21ac55 A	126	cpu_data_t *cdp);
1c79356b	127
91447636 A	128	static inline boolean_t
	129	valid_user_data_selector(uint16_t selector)
	130	{
	131	sel_t sel = selector_to_sel(selector);
	132
	133	if (selector == 0)
	134	return (TRUE);
1c79356b	135
91447636 A	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
	146	static inline boolean_t
	147	valid_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
	166	static inline boolean_t
	167	valid_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
	186	extern boolean_t
	187	valid_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);
1c79356b	193
91447636	194	__END_DECLS
1c79356b A	195
1c79356b A	196	#endif /* _I386_MP_DESC_H_ */