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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: /* CMU_ENDHIST */
26: /*
27: * Mach Operating System
28: * Copyright (c) 1991,1990 Carnegie Mellon University
29: * All Rights Reserved.
30: *
31: * Permission to use, copy, modify and distribute this software and its
32: * documentation is hereby granted, provided that both the copyright
33: * notice and this permission notice appear in all copies of the
34: * software, derivative works or modified versions, and any portions
35: * thereof, and that both notices appear in supporting documentation.
36: *
37: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
38: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
39: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
40: *
41: * Carnegie Mellon requests users of this software to return to
42: *
43: * Software Distribution Coordinator or [email protected]
44: * School of Computer Science
45: * Carnegie Mellon University
46: * Pittsburgh PA 15213-3890
47: *
48: * any improvements or extensions that they make and grant Carnegie Mellon
49: * the rights to redistribute these changes.
50: */
51: /*
52: */
53:
54: /*
55: * Global descriptor table.
56: */
57: #include <i386/thread.h>
58: #include <i386/seg.h>
59: #include <mach/i386/vm_param.h>
60: #include <kern/thread.h>
61: #include <mach_kdb.h>
62:
63: #ifdef MACH_BSD
64: extern int trap_unix_syscall(void), trap_mach25_syscall(void),
65: trap_machdep_syscall(void), syscall(void);
66: #endif
67:
68: struct fake_descriptor gdt[GDTSZ] = {
69: /* 0x000 */ { 0, 0, 0, 0 }, /* always NULL */
70: /* 0x008 */ { LINEAR_KERNEL_ADDRESS + VM_MIN_ADDRESS,
71: (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_KERNEL_ADDRESS)>>12,
72: SZ_32|SZ_G,
73: ACC_P|ACC_PL_K|ACC_CODE_R
74: }, /* kernel code */
75: /* 0x010 */ { LINEAR_KERNEL_ADDRESS + VM_MIN_ADDRESS,
76: (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_KERNEL_ADDRESS)>>12,
77: SZ_32|SZ_G,
78: ACC_P|ACC_PL_K|ACC_DATA_W
79: }, /* kernel data */
80: /* 0x018 */ { LINEAR_KERNEL_ADDRESS + (unsigned int)ldt,
81: LDTSZ*sizeof(struct fake_descriptor)-1,
82: 0,
83: ACC_P|ACC_PL_K|ACC_LDT
84: }, /* local descriptor table */
85: /* 0x020 */ { LINEAR_KERNEL_ADDRESS + (unsigned int)&ktss,
86: sizeof(struct i386_tss)-1,
87: 0,
88: ACC_P|ACC_PL_K|ACC_TSS
89: }, /* TSS for this processor */
90: #ifdef MACH_BSD
91: /* 0x28 */ { (unsigned int) &trap_unix_syscall,
92: KERNEL_CS,
93: 0, /* no parameters */
94: ACC_P|ACC_PL_U|ACC_CALL_GATE
95: },
96: /* 0x30 */ { (unsigned int) &trap_mach25_syscall,
97: KERNEL_CS,
98: 0, /* no parameters */
99: ACC_P|ACC_PL_U|ACC_CALL_GATE
100: },
101: /* 0x38 */ { (unsigned int) &trap_machdep_syscall,
102: KERNEL_CS,
103: 0, /* no parameters */
104: ACC_P|ACC_PL_U|ACC_CALL_GATE
105: },
106: #else
107: /* 0x028 */ { 0, 0, 0, 0 }, /* per-thread LDT */
108: /* 0x030 */ { 0, 0, 0, 0 }, /* per-thread TSS for IO bitmap */
109: /* 0x038 */ { 0, 0, 0, 0 },
110: #endif
111: /* 0x040 */ { 0, 0, 0, 0 },
112: /* 0x048 */ { LINEAR_KERNEL_ADDRESS + (unsigned int)&cpu_data[0],
113: sizeof(cpu_data)-1,
114: SZ_32,
115: ACC_P|ACC_PL_K|ACC_DATA_W
116: }, /* per-CPU current thread address */
117: #if MACH_KDB
118: /* 0x050 */ { LINEAR_KERNEL_ADDRESS + (unsigned int)&dbtss,
119: sizeof(struct i386_tss)-1,
120: 0,
121: ACC_P|ACC_PL_K|ACC_TSS
122: } /* TSS for this processor */
123: #endif /* MACH_KDB */
124: };
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