0b4c24551c21fc8df7bdeccce6bacc9de99642e2
[linux-3.10.git] / include / asm-powerpc / thread_info.h
1 /* thread_info.h: PowerPC 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_POWERPC_THREAD_INFO_H
9 #define _ASM_POWERPC_THREAD_INFO_H
10
11 #ifdef __KERNEL__
12
13 /* We have 8k stacks on ppc32 and 16k on ppc64 */
14
15 #ifdef CONFIG_PPC64
16 #define THREAD_SHIFT            14
17 #else
18 #define THREAD_SHIFT            13
19 #endif
20
21 #define THREAD_SIZE             (1 << THREAD_SHIFT)
22
23 #ifndef __ASSEMBLY__
24 #include <linux/config.h>
25 #include <linux/cache.h>
26 #include <asm/processor.h>
27 #include <asm/page.h>
28 #include <linux/stringify.h>
29
30 /*
31  * low level task data.
32  */
33 struct thread_info {
34         struct task_struct *task;               /* main task structure */
35         struct exec_domain *exec_domain;        /* execution domain */
36         int             cpu;                    /* cpu we're on */
37         int             preempt_count;          /* 0 => preemptable,
38                                                    <0 => BUG */
39         struct restart_block restart_block;
40         /* set by force_successful_syscall_return */
41         unsigned char   syscall_noerror;
42         /* low level flags - has atomic operations done on it */
43         unsigned long   flags ____cacheline_aligned_in_smp;
44 };
45
46 /*
47  * macros/functions for gaining access to the thread information structure
48  *
49  * preempt_count needs to be 1 initially, until the scheduler is functional.
50  */
51 #define INIT_THREAD_INFO(tsk)                   \
52 {                                               \
53         .task =         &tsk,                   \
54         .exec_domain =  &default_exec_domain,   \
55         .cpu =          0,                      \
56         .preempt_count = 1,                     \
57         .restart_block = {                      \
58                 .fn = do_no_restart_syscall,    \
59         },                                      \
60         .flags =        0,                      \
61 }
62
63 #define init_thread_info        (init_thread_union.thread_info)
64 #define init_stack              (init_thread_union.stack)
65
66 /* thread information allocation */
67
68 #ifdef CONFIG_DEBUG_STACK_USAGE
69 #define alloc_thread_info(tsk)                                  \
70         ({                                                      \
71                 struct thread_info *ret;                        \
72                                                                 \
73                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
74                 if (ret)                                        \
75                         memset(ret, 0, THREAD_SIZE);            \
76                 ret;                                            \
77         })
78 #else
79 #define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, GFP_KERNEL)
80 #endif
81 #define free_thread_info(ti)    kfree(ti)
82 #define get_thread_info(ti)     get_task_struct((ti)->task)
83 #define put_thread_info(ti)     put_task_struct((ti)->task)
84
85 /* how to get the thread information struct from C */
86 static inline struct thread_info *current_thread_info(void)
87 {
88         register unsigned long sp asm("r1");
89
90         /* gcc4, at least, is smart enough to turn this into a single
91          * rlwinm for ppc32 and clrrdi for ppc64 */
92         return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
93 }
94
95 #endif /* __ASSEMBLY__ */
96
97 #define PREEMPT_ACTIVE          0x10000000
98
99 /*
100  * thread information flag bit numbers
101  */
102 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
103 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
104 #define TIF_SIGPENDING          2       /* signal pending */
105 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
106 #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
107                                            TIF_NEED_RESCHED */
108 #define TIF_32BIT               5       /* 32 bit binary */
109 /* #define SPARE                6 */
110 #define TIF_ABI_PENDING         7       /* 32/64 bit switch needed */
111 #define TIF_SYSCALL_AUDIT       8       /* syscall auditing active */
112 #define TIF_SINGLESTEP          9       /* singlestepping active */
113 #define TIF_MEMDIE              10
114 #define TIF_SECCOMP             11      /* secure computing */
115
116 /* as above, but as bit values */
117 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
118 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
119 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
120 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
121 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
122 #define _TIF_32BIT              (1<<TIF_32BIT)
123 /* #define _SPARE               (1<<SPARE) */
124 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
125 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
126 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
127 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
128 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
129
130 #define _TIF_USER_WORK_MASK     (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
131                                  _TIF_NEED_RESCHED)
132
133 #endif /* __KERNEL__ */
134
135 #endif /* _ASM_POWERPC_THREAD_INFO_H */