[apple/xnu.git] / osfmk / i386 / ktss.c

/*
 * 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.
 */
/*
 */

/*
 * Kernel task state segment.
 *
 * We don't use the i386 task switch mechanism.  We need a TSS
 * only to hold the kernel stack pointer for the current thread.
 */
#include <i386/tss.h>
#include <i386/seg.h>
#include <mach_kdb.h>

struct i386_tss	master_ktss
	__attribute__ ((section ("__DESC, master_ktss")))
	__attribute__ ((aligned (4096))) = {
	0,				/* back link */
	0,				/* esp0 */
	KERNEL_DS,			/* ss0 */
	0,				/* esp1 */
	0,				/* ss1 */
	0,				/* esp2 */
	0,				/* ss2 */
	0,				/* cr3 */
	0,				/* eip */
	0,				/* eflags */
	0,				/* eax */
	0,				/* ecx */
	0,				/* edx */
	0,				/* ebx */
	0,				/* esp */
	0,				/* ebp */
	0,				/* esi */
	0,				/* edi */
	0,				/* es */
	0,				/* cs */
	0,				/* ss */
	0,				/* ds */
	0,				/* fs */
	0,				/* gs */
	KERNEL_LDT,			/* ldt */
	0,				/* trace_trap */
	0x0FFF				/* IO bitmap offset -
					   beyond end of TSS segment,
					   so no bitmap */
};

/*
 * The transient stack for sysenter.
 * At its top is a 32-bit link to the PCB in legacy mode, 64-bit otherwise.
 * NB: it also must be large enough to contain a interrupt stack frame
 * due to a single-step trace trap at system call entry.
 */
struct sysenter_stack master_sstk
	__attribute__ ((section ("__DESC, master_sstk")))
	__attribute__ ((aligned (16)))  = { {0}, 0 };

#ifdef X86_64
struct x86_64_tss master_ktss64 __attribute__ ((aligned (4096))) = {
	.io_bit_map_offset = 0x0FFF,
};
#endif	/* X86_64 */

/*
 * Task structure for double-fault handler:
 */
struct i386_tss	master_dftss
	__attribute__ ((section ("__DESC, master_dftss")))
	__attribute__ ((aligned (4096))) = {
	0,				/* back link */
	(int) &df_task_stack_end - 4,	/* esp0 */
	KERNEL_DS,			/* ss0 */
	0,				/* esp1 */
	0,				/* ss1 */
	0,				/* esp2 */
	0,				/* ss2 */
	0,				/* cr3 */
	(int) &df_task_start,		/* eip */
	0,				/* eflags */
	0,				/* eax */
	0,				/* ecx */
	0,				/* edx */
	0,				/* ebx */
	(int) &df_task_stack_end - 4,	/* esp */
	0,				/* ebp */
	0,				/* esi */
	0,				/* edi */
	KERNEL_DS,			/* es */
	KERNEL_CS,			/* cs */
	KERNEL_DS,			/* ss */
	KERNEL_DS,			/* ds */
	KERNEL_DS,			/* fs */
	CPU_DATA_GS,			/* gs */
	KERNEL_LDT,			/* ldt */
	0,				/* trace_trap */
	0x0FFF				/* IO bitmap offset -
					   beyond end of TSS segment,
					   so no bitmap */
};


/*
 * Task structure for machine_check handler:
 */
struct i386_tss	master_mctss
	__attribute__ ((section ("__DESC, master_mctss")))
	__attribute__ ((aligned (4096))) = {
	0,				/* back link */
	(int) &mc_task_stack_end - 4,	/* esp0 */
	KERNEL_DS,			/* ss0 */
	0,				/* esp1 */
	0,				/* ss1 */
	0,				/* esp2 */
	0,				/* ss2 */
	0,				/* cr3 */
	(int) &mc_task_start,		/* eip */
	0,				/* eflags */
	0,				/* eax */
	0,				/* ecx */
	0,				/* edx */
	0,				/* ebx */
	(int) &mc_task_stack_end - 4,	/* esp */
	0,				/* ebp */
	0,				/* esi */
	0,				/* edi */
	KERNEL_DS,			/* es */
	KERNEL_CS,			/* cs */
	KERNEL_DS,			/* ss */
	KERNEL_DS,			/* ds */
	KERNEL_DS,			/* fs */
	CPU_DATA_GS,			/* gs */
	KERNEL_LDT,			/* ldt */
	0,				/* trace_trap */
	0x0FFF				/* IO bitmap offset -
					   beyond end of TSS segment,
					   so no bitmap */
};

#if	MACH_KDB

struct i386_tss	master_dbtss
	__attribute__ ((section ("__DESC, master_dbtss")))
	__attribute__ ((aligned (4096))) = {
	0,				/* back link */
	0,				/* esp0 */
	KERNEL_DS,			/* ss0 */
	0,				/* esp1 */
	0,				/* ss1 */
	0,				/* esp2 */
	0,				/* ss2 */
	0,				/* cr3 */
	0,				/* eip */
	0,				/* eflags */
	0,				/* eax */
	0,				/* ecx */
	0,				/* edx */
	0,				/* ebx */
	0,				/* esp */
	0,				/* ebp */
	0,				/* esi */
	0,				/* edi */
	KERNEL_DS,			/* es */
	KERNEL_CS,			/* cs */
	KERNEL_DS,			/* ss */
	KERNEL_DS,			/* ds */
	KERNEL_DS,			/* fs */
	KERNEL_DS,			/* gs */
	KERNEL_LDT,			/* ldt */
	0,				/* trace_trap */
	0x0FFF				/* IO bitmap offset -
					   beyond end of TSS segment,
					   so no bitmap */
};

#endif	/* MACH_KDB */
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	* Kernel task state segment.
	61	*
	62	* We don't use the i386 task switch mechanism. We need a TSS
	63	* only to hold the kernel stack pointer for the current thread.
1c79356b A	64	*/
	65	#include <i386/tss.h>
	66	#include <i386/seg.h>
	67	#include <mach_kdb.h>
	68
0c530ab8 A	69	struct i386_tss master_ktss
	70	__attribute__ ((section ("__DESC, master_ktss")))
	71	__attribute__ ((aligned (4096))) = {
1c79356b A	72	0, /* back link */
	73	0, /* esp0 */
	74	KERNEL_DS, /* ss0 */
	75	0, /* esp1 */
	76	0, /* ss1 */
	77	0, /* esp2 */
	78	0, /* ss2 */
	79	0, /* cr3 */
	80	0, /* eip */
	81	0, /* eflags */
	82	0, /* eax */
	83	0, /* ecx */
	84	0, /* edx */
	85	0, /* ebx */
	86	0, /* esp */
	87	0, /* ebp */
	88	0, /* esi */
	89	0, /* edi */
	90	0, /* es */
	91	0, /* cs */
	92	0, /* ss */
	93	0, /* ds */
	94	0, /* fs */
	95	0, /* gs */
	96	KERNEL_LDT, /* ldt */
	97	0, /* trace_trap */
	98	0x0FFF /* IO bitmap offset -
	99	beyond end of TSS segment,
	100	so no bitmap */
	101	};
	102
0c530ab8 A	103	/*
	104	* The transient stack for sysenter.
	105	* At its top is a 32-bit link to the PCB in legacy mode, 64-bit otherwise.
	106	* NB: it also must be large enough to contain a interrupt stack frame
	107	* due to a single-step trace trap at system call entry.
	108	*/
	109	struct sysenter_stack master_sstk
	110	__attribute__ ((section ("__DESC, master_sstk")))
	111	__attribute__ ((aligned (16))) = { {0}, 0 };
	112
	113	#ifdef X86_64
	114	struct x86_64_tss master_ktss64 __attribute__ ((aligned (4096))) = {
	115	.io_bit_map_offset = 0x0FFF,
	116	};
	117	#endif /* X86_64 */
0c530ab8 A	118
	119	/*
	120	* Task structure for double-fault handler:
	121	*/
	122	struct i386_tss master_dftss
	123	__attribute__ ((section ("__DESC, master_dftss")))
	124	__attribute__ ((aligned (4096))) = {
	125	0, /* back link */
	126	(int) &df_task_stack_end - 4, /* esp0 */
	127	KERNEL_DS, /* ss0 */
	128	0, /* esp1 */
	129	0, /* ss1 */
	130	0, /* esp2 */
	131	0, /* ss2 */
	132	0, /* cr3 */
	133	(int) &df_task_start, /* eip */
	134	0, /* eflags */
	135	0, /* eax */
	136	0, /* ecx */
	137	0, /* edx */
	138	0, /* ebx */
	139	(int) &df_task_stack_end - 4, /* esp */
	140	0, /* ebp */
	141	0, /* esi */
	142	0, /* edi */
	143	KERNEL_DS, /* es */
	144	KERNEL_CS, /* cs */
	145	KERNEL_DS, /* ss */
	146	KERNEL_DS, /* ds */
	147	KERNEL_DS, /* fs */
	148	CPU_DATA_GS, /* gs */
	149	KERNEL_LDT, /* ldt */
	150	0, /* trace_trap */
	151	0x0FFF /* IO bitmap offset -
	152	beyond end of TSS segment,
	153	so no bitmap */
	154	};
	155
	156
	157	/*
	158	* Task structure for machine_check handler:
	159	*/
	160	struct i386_tss master_mctss
	161	__attribute__ ((section ("__DESC, master_mctss")))
	162	__attribute__ ((aligned (4096))) = {
	163	0, /* back link */
	164	(int) &mc_task_stack_end - 4, /* esp0 */
	165	KERNEL_DS, /* ss0 */
	166	0, /* esp1 */
	167	0, /* ss1 */
	168	0, /* esp2 */
	169	0, /* ss2 */
	170	0, /* cr3 */
	171	(int) &mc_task_start, /* eip */
	172	0, /* eflags */
	173	0, /* eax */
	174	0, /* ecx */
	175	0, /* edx */
	176	0, /* ebx */
	177	(int) &mc_task_stack_end - 4, /* esp */
	178	0, /* ebp */
	179	0, /* esi */
	180	0, /* edi */
	181	KERNEL_DS, /* es */
182	KERNEL_CS, /* cs */
183	KERNEL_DS, /* ss */
184	KERNEL_DS, /* ds */
185	KERNEL_DS, /* fs */
186	CPU_DATA_GS, /* gs */
187	KERNEL_LDT, /* ldt */
188	0, /* trace_trap */
189	0x0FFF /* IO bitmap offset -
190	beyond end of TSS segment,
191	so no bitmap */
192	};
193
1c79356b A	194	#if MACH_KDB
1c79356b A	195
0c530ab8 A	196	struct i386_tss master_dbtss
	197	__attribute__ ((section ("__DESC, master_dbtss")))
	198	__attribute__ ((aligned (4096))) = {
1c79356b A	199	0, /* back link */
	200	0, /* esp0 */
	201	KERNEL_DS, /* ss0 */
	202	0, /* esp1 */
	203	0, /* ss1 */
	204	0, /* esp2 */
	205	0, /* ss2 */
	206	0, /* cr3 */
	207	0, /* eip */
	208	0, /* eflags */
	209	0, /* eax */
	210	0, /* ecx */
	211	0, /* edx */
	212	0, /* ebx */
	213	0, /* esp */
	214	0, /* ebp */
	215	0, /* esi */
	216	0, /* edi */
	217	KERNEL_DS, /* es */
	218	KERNEL_CS, /* cs */
	219	KERNEL_DS, /* ss */
	220	KERNEL_DS, /* ds */
	221	KERNEL_DS, /* fs */
	222	KERNEL_DS, /* gs */
	223	KERNEL_LDT, /* ldt */
	224	0, /* trace_trap */
	225	0x0FFF /* IO bitmap offset -
	226	beyond end of TSS segment,
	227	so no bitmap */
	228	};
	229
	230	#endif /* MACH_KDB */