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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: #ifndef _I386_THREAD_ACT_H_
27: #define _I386_THREAD_ACT_H_
28:
29: #include <mach/boolean.h>
30: #include <mach/i386/vm_types.h>
31: #include <mach/i386/fp_reg.h>
32: #include <mach/thread_status.h>
33:
34: #include <kern/lock.h>
35:
36: #include <i386/iopb.h>
37: #include <i386/tss.h>
38: #include <i386/eflags.h>
39:
40: /*
41: * i386_saved_state:
42: *
43: * Has been exported to servers. See: mach/i386/thread_status.h
44: *
45: * This structure corresponds to the state of user registers
46: * as saved upon kernel entry. It lives in the pcb.
47: * It is also pushed onto the stack for exceptions in the kernel.
48: * For performance, it is also used directly in syscall exceptions
49: * if the server has requested i386_THREAD_STATE flavor for the exception
50: * port.
51: *
52: * We define the following as an alias for the "esp" field of the
53: * structure, because we actually save cr2 here, not the kernel esp.
54: */
55: #define cr2 esp
56:
57: /*
58: * Save area for user floating-point state.
59: * Allocated only when necessary.
60: */
61:
62: struct i386_fpsave_state {
63: boolean_t fp_valid;
64: struct i386_fp_save fp_save_state;
65: struct i386_fp_regs fp_regs;
66: };
67:
68: /*
69: * v86_assist_state:
70: *
71: * This structure provides data to simulate 8086 mode
72: * interrupts. It lives in the pcb.
73: */
74:
75: struct v86_assist_state {
76: vm_offset_t int_table;
77: unsigned short int_count;
78: unsigned short flags; /* 8086 flag bits */
79: };
80: #define V86_IF_PENDING 0x8000 /* unused bit */
81:
82: /*
83: * i386_interrupt_state:
84: *
85: * This structure describes the set of registers that must
86: * be pushed on the current ring-0 stack by an interrupt before
87: * we can switch to the interrupt stack.
88: */
89:
90: struct i386_interrupt_state {
91: int es;
92: int ds;
93: int edx;
94: int ecx;
95: int eax;
96: int eip;
97: int cs;
98: int efl;
99: };
100:
101: /*
102: * i386_kernel_state:
103: *
104: * This structure corresponds to the state of kernel registers
105: * as saved in a context-switch. It lives at the base of the stack.
106: */
107:
108: struct i386_kernel_state {
109: int k_ebx; /* kernel context */
110: int k_esp;
111: int k_ebp;
112: int k_edi;
113: int k_esi;
114: int k_eip;
115: };
116:
117: /*
118: * i386_machine_state:
119: *
120: * This structure corresponds to special machine state.
121: * It lives in the pcb. It is not saved by default.
122: */
123:
124: struct i386_machine_state {
125: iopb_tss_t io_tss;
126: struct user_ldt * ldt;
127: struct i386_fpsave_state *ifps;
128: struct v86_assist_state v86s;
129: };
130:
131: typedef struct pcb {
132: struct i386_interrupt_state iis[2]; /* interrupt and NMI */
133: struct i386_saved_state iss;
134: struct i386_machine_state ims;
135: #ifdef MACH_BSD
136: unsigned long cthread_self; /* for use of cthread package */
137: #endif
138: decl_simple_lock_data(,lock)
139: } *pcb_t;
140:
141: /*
142: * Maps state flavor to number of words in the state:
143: */
144: extern unsigned int state_count[];
145:
146:
147: #define USER_REGS(ThrAct) (&(ThrAct)->mact.pcb->iss)
148:
149: #define act_machine_state_ptr(ThrAct) (thread_state_t)USER_REGS(ThrAct)
150:
151:
152: #define is_user_thread(ThrAct) \
153: ((USER_REGS(ThrAct)->efl & EFL_VM) \
154: || ((USER_REGS(ThrAct)->cs & 0x03) != 0))
155:
156: #define user_pc(ThrAct) (USER_REGS(ThrAct)->eip)
157: #define user_sp(ThrAct) (USER_REGS(ThrAct)->uesp)
158:
159: #define syscall_emulation_sync(task) /* do nothing */
160:
161: typedef struct MachineThrAct {
162: /*
163: * pointer to process control block
164: * (actual storage may as well be here, too)
165: */
166: struct pcb xxx_pcb;
167: pcb_t pcb;
168:
169: } MachineThrAct, *MachineThrAct_t;
170:
171: /*
172: * On i386, user stacks of collocated servers are wired.
173: * Unwire these user stacks when their threads are swapped out.
174: */
175: #define THREAD_SWAP_UNWIRE_USER_STACK TRUE
176:
177: #endif /* _I386_THREAD_ACT_H_ */
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