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1da177e4 LT |
1 | /* |
2 | * include/asm-s390/thread_info.h | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) | |
7 | */ | |
8 | ||
9 | #ifndef _ASM_THREAD_INFO_H | |
10 | #define _ASM_THREAD_INFO_H | |
11 | ||
12 | #ifdef __KERNEL__ | |
13 | ||
14 | /* | |
15 | * Size of kernel stack for each process | |
16 | */ | |
17 | #ifndef __s390x__ | |
18 | #ifndef __SMALL_STACK | |
19 | #define THREAD_ORDER 1 | |
20 | #define ASYNC_ORDER 1 | |
21 | #else | |
22 | #define THREAD_ORDER 0 | |
23 | #define ASYNC_ORDER 0 | |
24 | #endif | |
25 | #else /* __s390x__ */ | |
26 | #ifndef __SMALL_STACK | |
27 | #define THREAD_ORDER 2 | |
28 | #define ASYNC_ORDER 2 | |
29 | #else | |
30 | #define THREAD_ORDER 1 | |
31 | #define ASYNC_ORDER 1 | |
32 | #endif | |
33 | #endif /* __s390x__ */ | |
34 | ||
35 | #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) | |
36 | #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) | |
37 | ||
38 | #ifndef __ASSEMBLY__ | |
39 | #include <asm/processor.h> | |
40 | #include <asm/lowcore.h> | |
41 | ||
42 | /* | |
43 | * low level task data that entry.S needs immediate access to | |
44 | * - this struct should fit entirely inside of one cache line | |
45 | * - this struct shares the supervisor stack pages | |
46 | * - if the contents of this structure are changed, the assembly constants must also be changed | |
47 | */ | |
48 | struct thread_info { | |
49 | struct task_struct *task; /* main task structure */ | |
50 | struct exec_domain *exec_domain; /* execution domain */ | |
51 | unsigned long flags; /* low level flags */ | |
52 | unsigned int cpu; /* current CPU */ | |
53 | unsigned int preempt_count; /* 0 => preemptable */ | |
54 | struct restart_block restart_block; | |
55 | }; | |
56 | ||
57 | /* | |
58 | * macros/functions for gaining access to the thread information structure | |
59 | */ | |
60 | #define INIT_THREAD_INFO(tsk) \ | |
61 | { \ | |
62 | .task = &tsk, \ | |
63 | .exec_domain = &default_exec_domain, \ | |
64 | .flags = 0, \ | |
65 | .cpu = 0, \ | |
66 | .restart_block = { \ | |
67 | .fn = do_no_restart_syscall, \ | |
68 | }, \ | |
69 | } | |
70 | ||
71 | #define init_thread_info (init_thread_union.thread_info) | |
72 | #define init_stack (init_thread_union.stack) | |
73 | ||
74 | /* how to get the thread information struct from C */ | |
75 | static inline struct thread_info *current_thread_info(void) | |
76 | { | |
77 | return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE); | |
78 | } | |
79 | ||
80 | /* thread information allocation */ | |
81 | #define alloc_thread_info(tsk) ((struct thread_info *) \ | |
82 | __get_free_pages(GFP_KERNEL,THREAD_ORDER)) | |
83 | #define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER) | |
84 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
85 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
86 | ||
87 | #endif | |
88 | ||
89 | /* | |
90 | * thread information flags bit numbers | |
91 | */ | |
92 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
93 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
94 | #define TIF_SIGPENDING 2 /* signal pending */ | |
95 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
96 | #define TIF_RESTART_SVC 4 /* restart svc with new svc number */ | |
97 | #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ | |
98 | #define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */ | |
99 | #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ | |
100 | #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling | |
101 | TIF_NEED_RESCHED */ | |
102 | #define TIF_31BIT 18 /* 32bit process */ | |
103 | #define TIF_MEMDIE 19 | |
104 | ||
105 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
106 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
107 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
108 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
109 | #define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC) | |
110 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
111 | #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) | |
112 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) | |
113 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
114 | #define _TIF_31BIT (1<<TIF_31BIT) | |
115 | ||
116 | #endif /* __KERNEL__ */ | |
117 | ||
118 | #define PREEMPT_ACTIVE 0x4000000 | |
119 | ||
120 | #endif /* _ASM_THREAD_INFO_H */ |