71244d8a427d3b175716400597b06d7cdaf677d6
[linux-3.10.git] / include / asm-ppc64 / thread_info.h
1 /* thread_info.h: PPC low-level thread information
2  * adapted from the i386 version by Paul Mackerras
3  *
4  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
5  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6  */
7
8 #ifndef _ASM_THREAD_INFO_H
9 #define _ASM_THREAD_INFO_H
10
11 #ifdef __KERNEL__
12
13 #ifndef __ASSEMBLY__
14 #include <linux/config.h>
15 #include <linux/cache.h>
16 #include <asm/processor.h>
17 #include <asm/page.h>
18 #include <linux/stringify.h>
19
20 /*
21  * low level task data.
22  */
23 struct thread_info {
24         struct task_struct *task;               /* main task structure */
25         struct exec_domain *exec_domain;        /* execution domain */
26         int             cpu;                    /* cpu we're on */
27         int             preempt_count;          /* 0 => preemptable, <0 => BUG */
28         struct restart_block restart_block;
29         /* set by force_successful_syscall_return */
30         unsigned char   syscall_noerror;
31         /* low level flags - has atomic operations done on it */
32         unsigned long   flags ____cacheline_aligned_in_smp;
33 };
34
35 /*
36  * macros/functions for gaining access to the thread information structure
37  *
38  * preempt_count needs to be 1 initially, until the scheduler is functional.
39  */
40 #define INIT_THREAD_INFO(tsk)                   \
41 {                                               \
42         .task =         &tsk,                   \
43         .exec_domain =  &default_exec_domain,   \
44         .cpu =          0,                      \
45         .preempt_count = 1,                     \
46         .restart_block = {                      \
47                 .fn = do_no_restart_syscall,    \
48         },                                      \
49         .flags =        0,                      \
50 }
51
52 #define init_thread_info        (init_thread_union.thread_info)
53 #define init_stack              (init_thread_union.stack)
54
55 /* thread information allocation */
56
57 #define THREAD_SHIFT            14
58 #define THREAD_ORDER            (THREAD_SHIFT - PAGE_SHIFT)
59 #define THREAD_SIZE             (1 << THREAD_SHIFT)
60 #ifdef CONFIG_DEBUG_STACK_USAGE
61 #define alloc_thread_info(tsk)                                  \
62         ({                                                      \
63                 struct thread_info *ret;                        \
64                                                                 \
65                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
66                 if (ret)                                        \
67                         memset(ret, 0, THREAD_SIZE);            \
68                 ret;                                            \
69         })
70 #else
71 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
72 #endif
73 #define free_thread_info(ti)    kfree(ti)
74 #define get_thread_info(ti)     get_task_struct((ti)->task)
75 #define put_thread_info(ti)     put_task_struct((ti)->task)
76
77 /* how to get the thread information struct from C */
78 static inline struct thread_info *current_thread_info(void)
79 {
80         struct thread_info *ti;
81         __asm__("clrrdi %0,1,%1" : "=r"(ti) : "i" (THREAD_SHIFT));
82         return ti;
83 }
84
85 #endif /* __ASSEMBLY__ */
86
87 #define PREEMPT_ACTIVE          0x10000000
88
89 /*
90  * thread information flag 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_POLLING_NRFLAG      4       /* true if poll_idle() is polling
97                                            TIF_NEED_RESCHED */
98 #define TIF_32BIT               5       /* 32 bit binary */
99 /* #define SPARE                6 */
100 #define TIF_ABI_PENDING         7       /* 32/64 bit switch needed */
101 #define TIF_SYSCALL_AUDIT       8       /* syscall auditing active */
102 #define TIF_SINGLESTEP          9       /* singlestepping active */
103 #define TIF_MEMDIE              10
104 #define TIF_SECCOMP             11      /* secure computing */
105
106 /* as above, but as bit values */
107 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
108 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
109 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
110 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
111 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
112 #define _TIF_32BIT              (1<<TIF_32BIT)
113 /* #define _SPARE               (1<<SPARE) */
114 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
115 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
116 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
117 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
118 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
119
120 #define _TIF_USER_WORK_MASK     (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
121                                  _TIF_NEED_RESCHED)
122
123 #endif /* __KERNEL__ */
124
125 #endif /* _ASM_THREAD_INFO_H */