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Commit	Line	Data
	1	/*
	2	* Copyright (c) 2000 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	* Copyright (c) 1992 NeXT Computer, Inc.
	30	*
	31	* Selector value conversion/validation.
	32	*
	33	* HISTORY
	34	*
	35	* 19 June 1992 ? at NeXT
	36	* Created.
	37	*/
	38
	39
	40	static inline
	41	unsigned int
	42	sel_to_selector(
	43	sel_t sel
	44	)
	45	{
	46	union {
	47	sel_t sel;
	48	unsigned short selector;
	49	} tconv;
	50
	51	tconv.sel = sel;
	52
	53	return (tconv.selector);
	54	}
	55
	56	static inline
	57	sel_t
	58	selector_to_sel(
	59	unsigned int selector
	60	)
	61	{
	62	union {
	63	unsigned short selector;
	64	sel_t sel;
	65	} tconv;
	66
	67	tconv.selector = selector;
	68
	69	return (tconv.sel);
	70	}
	71
	72	#if 0
	73	static inline
	74	boolean_t
	75	valid_user_data_selector(
	76	unsigned int selector
	77	)
	78	{
	79	sel_t sel = selector_to_sel(selector);
	80
	81	if (selector == 0)
	82	return (TRUE);
	83
	84	if (sel.ti == SEL_LDT)
	85	return (TRUE);
	86	else if (sel.index < GDTSZ) {
	87	data_desc_t desc = (data_desc_t )sel_to_gdt_entry(sel);
	88
	89	if (desc->dpl == USER_PRIV)
	90	return (TRUE);
	91	}
	92
	93	return (FALSE);
	94	}
	95
	96	static inline
	97	boolean_t
	98	valid_user_code_selector(
	99	unsigned int selector
	100	)
	101	{
	102	sel_t sel = selector_to_sel(selector);
	103
	104	if (selector == 0)
	105	return (FALSE);
	106
	107	if (sel.ti == SEL_LDT) {
	108	if (sel.rpl == USER_PRIV)
	109	return (TRUE);
	110	}
	111	else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
	112	code_desc_t desc = (code_desc_t )sel_to_gdt_entry(sel);
	113
	114	if (desc->dpl == USER_PRIV)
	115	return (TRUE);
	116	}
	117
	118	return (FALSE);
	119	}
	120
	121	static inline
	122	boolean_t
	123	valid_user_stack_selector(
	124	unsigned int selector
	125	)
	126	{
	127	sel_t sel = selector_to_sel(selector);
	128
	129	if (selector == 0)
	130	return (FALSE);
	131
	132	if (sel.ti == SEL_LDT) {
	133	if (sel.rpl == USER_PRIV)
	134	return (TRUE);
	135	}
	136	else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
	137	data_desc_t desc = (data_desc_t )sel_to_gdt_entry(sel);
	138
	139	if (desc->dpl == USER_PRIV)
	140	return (TRUE);
	141	}
	142
	143	return (FALSE);
	144	}
	145	#endif