diff options
Diffstat (limited to 'include/asm-powerpc/thread_info.h')
-rw-r--r-- | include/asm-powerpc/thread_info.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h new file mode 100644 index 000000000000..ab17db79f69d --- /dev/null +++ b/include/asm-powerpc/thread_info.h | |||
@@ -0,0 +1,142 @@ | |||
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 THREAD_INFO_GFP GFP_KERNEL | __GFP_ZERO | ||
70 | #else | ||
71 | #define THREAD_INFO_GFP GFP_KERNEL | ||
72 | #endif | ||
73 | |||
74 | #if THREAD_SHIFT >= PAGE_SHIFT | ||
75 | |||
76 | #define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) | ||
77 | |||
78 | #define alloc_thread_info(tsk) \ | ||
79 | ((struct thread_info *)__get_free_pages(THREAD_INFO_GFP, THREAD_ORDER)) | ||
80 | #define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER) | ||
81 | |||
82 | #else /* THREAD_SHIFT < PAGE_SHIFT */ | ||
83 | |||
84 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, THREAD_INFO_GFP) | ||
85 | #define free_thread_info(ti) kfree(ti) | ||
86 | |||
87 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | ||
88 | |||
89 | #define get_thread_info(ti) get_task_struct((ti)->task) | ||
90 | #define put_thread_info(ti) put_task_struct((ti)->task) | ||
91 | |||
92 | /* how to get the thread information struct from C */ | ||
93 | static inline struct thread_info *current_thread_info(void) | ||
94 | { | ||
95 | register unsigned long sp asm("r1"); | ||
96 | |||
97 | /* gcc4, at least, is smart enough to turn this into a single | ||
98 | * rlwinm for ppc32 and clrrdi for ppc64 */ | ||
99 | return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); | ||
100 | } | ||
101 | |||
102 | #endif /* __ASSEMBLY__ */ | ||
103 | |||
104 | #define PREEMPT_ACTIVE 0x10000000 | ||
105 | |||
106 | /* | ||
107 | * thread information flag bit numbers | ||
108 | */ | ||
109 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | ||
110 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | ||
111 | #define TIF_SIGPENDING 2 /* signal pending */ | ||
112 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | ||
113 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling | ||
114 | TIF_NEED_RESCHED */ | ||
115 | #define TIF_32BIT 5 /* 32 bit binary */ | ||
116 | /* #define SPARE 6 */ | ||
117 | #define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */ | ||
118 | #define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */ | ||
119 | #define TIF_SINGLESTEP 9 /* singlestepping active */ | ||
120 | #define TIF_MEMDIE 10 | ||
121 | #define TIF_SECCOMP 11 /* secure computing */ | ||
122 | |||
123 | /* as above, but as bit values */ | ||
124 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | ||
125 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | ||
126 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | ||
127 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | ||
128 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | ||
129 | #define _TIF_32BIT (1<<TIF_32BIT) | ||
130 | /* #define _SPARE (1<<SPARE) */ | ||
131 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) | ||
132 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | ||
133 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | ||
134 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | ||
135 | #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) | ||
136 | |||
137 | #define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \ | ||
138 | _TIF_NEED_RESCHED) | ||
139 | |||
140 | #endif /* __KERNEL__ */ | ||
141 | |||
142 | #endif /* _ASM_POWERPC_THREAD_INFO_H */ | ||