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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * @OSF_COPYRIGHT@
24: */
25: /*
26: * Mach Operating System
27: * Copyright (c) 1991,1990,1989 Carnegie Mellon University
28: * All Rights Reserved.
29: *
30: * Permission to use, copy, modify and distribute this software and its
31: * documentation is hereby granted, provided that both the copyright
32: * notice and this permission notice appear in all copies of the
33: * software, derivative works or modified versions, and any portions
34: * thereof, and that both notices appear in supporting documentation.
35: *
36: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
39: *
40: * Carnegie Mellon requests users of this software to return to
41: *
42: * Software Distribution Coordinator or [email protected]
43: * School of Computer Science
44: * Carnegie Mellon University
45: * Pittsburgh PA 15213-3890
46: *
47: * any improvements or extensions that they make and grant Carnegie Mellon
48: * the rights to redistribute these changes.
49: */
50: /*
51: */
52:
53: /*
54: * File: machine/thread.h
55: *
56: * This file contains the structure definitions for the thread
57: * state as applied to I386 processors.
58: */
59:
60: #ifndef _I386_THREAD_H_
61: #define _I386_THREAD_H_
62:
63: #include <mach/boolean.h>
64: #include <mach/i386/vm_types.h>
65: #include <mach/i386/fp_reg.h>
66:
67: #include <kern/lock.h>
68:
69: #include <i386/iopb.h>
70: #include <i386/seg.h>
71: #include <i386/tss.h>
72: #include <i386/eflags.h>
73: #include <i386/thread_act.h>
74:
75: /*
76: * i386_exception_link:
77: *
78: * This structure lives at the high end of the kernel stack.
79: * It points to the current thread`s user registers.
80: */
81: struct i386_exception_link {
82: struct i386_saved_state *saved_state;
83: };
84:
85:
86: /*
87: * On the kernel stack is:
88: * stack: ...
89: * struct i386_exception_link
90: * struct i386_kernel_state
91: * stack+KERNEL_STACK_SIZE
92: */
93:
94: #define STACK_IKS(stack) \
95: ((struct i386_kernel_state *)((stack) + KERNEL_STACK_SIZE) - 1)
96: #define STACK_IEL(stack) \
97: ((struct i386_exception_link *)STACK_IKS(stack) - 1)
98:
99: #if NCPUS > 1
100: #include <i386/mp_desc.h>
101: #endif
102:
103: /*
104: * Boot-time data for master (or only) CPU
105: */
106: extern struct fake_descriptor idt[IDTSZ];
107: extern struct fake_descriptor gdt[GDTSZ];
108: extern struct fake_descriptor ldt[LDTSZ];
109: extern struct i386_tss ktss;
110: #if MACH_KDB
111: extern char db_stack_store[];
112: extern char db_task_stack_store[];
113: extern struct i386_tss dbtss;
114: extern void db_task_start(void);
115: #endif /* MACH_KDB */
116: #if NCPUS > 1
117: #define curr_gdt(mycpu) (mp_gdt[mycpu])
118: #define curr_ktss(mycpu) (mp_ktss[mycpu])
119: #else
120: #define curr_gdt(mycpu) (gdt)
121: #define curr_ktss(mycpu) (&ktss)
122: #endif
123:
124: #define gdt_desc_p(mycpu,sel) \
125: ((struct real_descriptor *)&curr_gdt(mycpu)[sel_idx(sel)])
126:
127: /*
128: * Return address of the function that called current function, given
129: * address of the first parameter of current function.
130: */
131: #define GET_RETURN_PC(addr) (*((vm_offset_t *)addr - 1))
132:
133: /*
134: * Defining this indicates that MD code will supply an exception()
135: * routine, conformant with kern/exception.c (dependency alert!)
136: * but which does wonderfully fast, machine-dependent magic.
137: */
138: #define MACHINE_FAST_EXCEPTION 1
139:
140: /*
141: * MD Macro to fill up global stack state,
142: * keeping the MD structure sizes + games private
143: */
144: #define MACHINE_STACK_STASH(stack) \
145: MACRO_BEGIN \
146: mp_disable_preemption(); \
147: kernel_stack[cpu_number()] = (stack) + \
148: (KERNEL_STACK_SIZE - sizeof (struct i386_exception_link) \
149: - sizeof (struct i386_kernel_state)), \
150: active_stacks[cpu_number()] = (stack); \
151: mp_enable_preemption(); \
152: MACRO_END
153:
154: #endif /* _I386_THREAD_H_ */
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