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6cb7bfeb | 1 | /* thread_info.h: PowerPC low-level thread information |
1da177e4 LT |
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 | ||
6cb7bfeb DG |
8 | #ifndef _ASM_POWERPC_THREAD_INFO_H |
9 | #define _ASM_POWERPC_THREAD_INFO_H | |
1da177e4 LT |
10 | |
11 | #ifdef __KERNEL__ | |
12 | ||
6cb7bfeb DG |
13 | /* We have 8k stacks on ppc32 and 16k on ppc64 */ |
14 | ||
e1240122 | 15 | #if defined(CONFIG_PPC64) |
6cb7bfeb | 16 | #define THREAD_SHIFT 14 |
e1240122 YT |
17 | #elif defined(CONFIG_PPC_256K_PAGES) |
18 | #define THREAD_SHIFT 15 | |
6cb7bfeb DG |
19 | #else |
20 | #define THREAD_SHIFT 13 | |
21 | #endif | |
22 | ||
23 | #define THREAD_SIZE (1 << THREAD_SHIFT) | |
24 | ||
1da177e4 | 25 | #ifndef __ASSEMBLY__ |
1da177e4 LT |
26 | #include <linux/cache.h> |
27 | #include <asm/processor.h> | |
28 | #include <asm/page.h> | |
29 | #include <linux/stringify.h> | |
30 | ||
31 | /* | |
32 | * low level task data. | |
33 | */ | |
34 | struct thread_info { | |
35 | struct task_struct *task; /* main task structure */ | |
36 | struct exec_domain *exec_domain; /* execution domain */ | |
37 | int cpu; /* cpu we're on */ | |
6cb7bfeb DG |
38 | int preempt_count; /* 0 => preemptable, |
39 | <0 => BUG */ | |
1da177e4 | 40 | struct restart_block restart_block; |
f39224a8 PM |
41 | unsigned long local_flags; /* private flags for thread */ |
42 | ||
1da177e4 LT |
43 | /* low level flags - has atomic operations done on it */ |
44 | unsigned long flags ____cacheline_aligned_in_smp; | |
45 | }; | |
46 | ||
47 | /* | |
48 | * macros/functions for gaining access to the thread information structure | |
1da177e4 LT |
49 | */ |
50 | #define INIT_THREAD_INFO(tsk) \ | |
51 | { \ | |
52 | .task = &tsk, \ | |
53 | .exec_domain = &default_exec_domain, \ | |
54 | .cpu = 0, \ | |
c99e6efe | 55 | .preempt_count = INIT_PREEMPT_COUNT, \ |
1da177e4 LT |
56 | .restart_block = { \ |
57 | .fn = do_no_restart_syscall, \ | |
58 | }, \ | |
59 | .flags = 0, \ | |
60 | } | |
61 | ||
62 | #define init_thread_info (init_thread_union.thread_info) | |
63 | #define init_stack (init_thread_union.stack) | |
64 | ||
b69c49b7 | 65 | #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) |
328985b2 | 66 | |
1da177e4 LT |
67 | /* how to get the thread information struct from C */ |
68 | static inline struct thread_info *current_thread_info(void) | |
69 | { | |
6cb7bfeb DG |
70 | register unsigned long sp asm("r1"); |
71 | ||
72 | /* gcc4, at least, is smart enough to turn this into a single | |
73 | * rlwinm for ppc32 and clrrdi for ppc64 */ | |
74 | return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); | |
1da177e4 LT |
75 | } |
76 | ||
77 | #endif /* __ASSEMBLY__ */ | |
78 | ||
79 | #define PREEMPT_ACTIVE 0x10000000 | |
80 | ||
81 | /* | |
82 | * thread information flag bit numbers | |
83 | */ | |
84 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
a583f1b5 SE |
85 | #define TIF_SIGPENDING 1 /* signal pending */ |
86 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
87 | #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling | |
1da177e4 | 88 | TIF_NEED_RESCHED */ |
a583f1b5 SE |
89 | #define TIF_32BIT 4 /* 32 bit binary */ |
90 | #define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */ | |
91 | #define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */ | |
92 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ | |
93 | #define TIF_SINGLESTEP 8 /* singlestepping active */ | |
0ddc9324 | 94 | #define TIF_MEMDIE 9 /* is terminating due to OOM killer */ |
a583f1b5 SE |
95 | #define TIF_SECCOMP 10 /* secure computing */ |
96 | #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ | |
97 | #define TIF_NOERROR 12 /* Force successful syscall return */ | |
7d6d637d | 98 | #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ |
02424d89 | 99 | #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ |
1da177e4 LT |
100 | |
101 | /* as above, but as bit values */ | |
102 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
1da177e4 LT |
103 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
104 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
105 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
106 | #define _TIF_32BIT (1<<TIF_32BIT) | |
f341973d AB |
107 | #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK) |
108 | #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW) | |
1da177e4 LT |
109 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
110 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
111 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
401d1f02 | 112 | #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) |
401d1f02 | 113 | #define _TIF_NOERROR (1<<TIF_NOERROR) |
7d6d637d | 114 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
02424d89 | 115 | #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) |
02424d89 IM |
116 | #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ |
117 | _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT) | |
1da177e4 | 118 | |
7d6d637d RM |
119 | #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ |
120 | _TIF_NOTIFY_RESUME) | |
1bd79336 | 121 | #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) |
1da177e4 | 122 | |
f39224a8 PM |
123 | /* Bits in local_flags */ |
124 | /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ | |
125 | #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ | |
a560643e PM |
126 | #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ |
127 | #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ | |
d6bf29b4 | 128 | #define TLF_LAZY_MMU 3 /* tlb_batch is active */ |
fe1952fc | 129 | #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ |
f39224a8 PM |
130 | |
131 | #define _TLF_NAPPING (1 << TLF_NAPPING) | |
a560643e | 132 | #define _TLF_SLEEPING (1 << TLF_SLEEPING) |
7a10174e | 133 | #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) |
d6bf29b4 | 134 | #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) |
fe1952fc | 135 | #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) |
7a10174e RM |
136 | |
137 | #ifndef __ASSEMBLY__ | |
138 | #define HAVE_SET_RESTORE_SIGMASK 1 | |
139 | static inline void set_restore_sigmask(void) | |
140 | { | |
141 | struct thread_info *ti = current_thread_info(); | |
142 | ti->local_flags |= _TLF_RESTORE_SIGMASK; | |
edd63a27 | 143 | WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); |
7a10174e | 144 | } |
4ebefe3e AV |
145 | static inline void clear_restore_sigmask(void) |
146 | { | |
147 | current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK; | |
148 | } | |
149 | static inline bool test_restore_sigmask(void) | |
150 | { | |
151 | return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK; | |
152 | } | |
153 | static inline bool test_and_clear_restore_sigmask(void) | |
154 | { | |
155 | struct thread_info *ti = current_thread_info(); | |
156 | if (!(ti->local_flags & _TLF_RESTORE_SIGMASK)) | |
157 | return false; | |
158 | ti->local_flags &= ~_TLF_RESTORE_SIGMASK; | |
159 | return true; | |
160 | } | |
a465f9b6 | 161 | |
fe1952fc BH |
162 | static inline bool test_thread_local_flags(unsigned int flags) |
163 | { | |
164 | struct thread_info *ti = current_thread_info(); | |
165 | return (ti->local_flags & flags) != 0; | |
166 | } | |
167 | ||
a465f9b6 AB |
168 | #ifdef CONFIG_PPC64 |
169 | #define is_32bit_task() (test_thread_flag(TIF_32BIT)) | |
170 | #else | |
171 | #define is_32bit_task() (1) | |
172 | #endif | |
173 | ||
7a10174e | 174 | #endif /* !__ASSEMBLY__ */ |
f39224a8 | 175 | |
1da177e4 LT |
176 | #endif /* __KERNEL__ */ |
177 | ||
6cb7bfeb | 178 | #endif /* _ASM_POWERPC_THREAD_INFO_H */ |