Commit | Line | Data |
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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 | ||
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 | ||
1da177e4 | 23 | #ifndef __ASSEMBLY__ |
1da177e4 LT |
24 | #include <linux/cache.h> |
25 | #include <asm/processor.h> | |
26 | #include <asm/page.h> | |
27 | #include <linux/stringify.h> | |
28 | ||
29 | /* | |
30 | * low level task data. | |
31 | */ | |
32 | struct thread_info { | |
33 | struct task_struct *task; /* main task structure */ | |
34 | struct exec_domain *exec_domain; /* execution domain */ | |
35 | int cpu; /* cpu we're on */ | |
6cb7bfeb DG |
36 | int preempt_count; /* 0 => preemptable, |
37 | <0 => BUG */ | |
1da177e4 | 38 | struct restart_block restart_block; |
f39224a8 PM |
39 | unsigned long local_flags; /* private flags for thread */ |
40 | ||
1da177e4 LT |
41 | /* low level flags - has atomic operations done on it */ |
42 | unsigned long flags ____cacheline_aligned_in_smp; | |
43 | }; | |
44 | ||
45 | /* | |
46 | * macros/functions for gaining access to the thread information structure | |
47 | * | |
48 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
49 | */ | |
50 | #define INIT_THREAD_INFO(tsk) \ | |
51 | { \ | |
52 | .task = &tsk, \ | |
53 | .exec_domain = &default_exec_domain, \ | |
54 | .cpu = 0, \ | |
55 | .preempt_count = 1, \ | |
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 | ||
65 | /* thread information allocation */ | |
66 | ||
328985b2 DG |
67 | #if THREAD_SHIFT >= PAGE_SHIFT |
68 | ||
69 | #define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) | |
70 | ||
3c726f8d | 71 | #ifdef CONFIG_DEBUG_STACK_USAGE |
328985b2 | 72 | #define alloc_thread_info(tsk) \ |
3c726f8d BH |
73 | ((struct thread_info *)__get_free_pages(GFP_KERNEL | \ |
74 | __GFP_ZERO, THREAD_ORDER)) | |
75 | #else | |
76 | #define alloc_thread_info(tsk) \ | |
77 | ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER)) | |
78 | #endif | |
328985b2 DG |
79 | #define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER) |
80 | ||
81 | #else /* THREAD_SHIFT < PAGE_SHIFT */ | |
82 | ||
f6a61680 BH |
83 | extern struct thread_info *alloc_thread_info(struct task_struct *tsk); |
84 | extern void free_thread_info(struct thread_info *ti); | |
328985b2 DG |
85 | |
86 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | |
87 | ||
1da177e4 LT |
88 | /* how to get the thread information struct from C */ |
89 | static inline struct thread_info *current_thread_info(void) | |
90 | { | |
6cb7bfeb DG |
91 | register unsigned long sp asm("r1"); |
92 | ||
93 | /* gcc4, at least, is smart enough to turn this into a single | |
94 | * rlwinm for ppc32 and clrrdi for ppc64 */ | |
95 | return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); | |
1da177e4 LT |
96 | } |
97 | ||
98 | #endif /* __ASSEMBLY__ */ | |
99 | ||
100 | #define PREEMPT_ACTIVE 0x10000000 | |
101 | ||
102 | /* | |
103 | * thread information flag bit numbers | |
104 | */ | |
105 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
a583f1b5 SE |
106 | #define TIF_SIGPENDING 1 /* signal pending */ |
107 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
108 | #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling | |
1da177e4 | 109 | TIF_NEED_RESCHED */ |
a583f1b5 SE |
110 | #define TIF_32BIT 4 /* 32 bit binary */ |
111 | #define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */ | |
112 | #define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */ | |
113 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ | |
114 | #define TIF_SINGLESTEP 8 /* singlestepping active */ | |
115 | #define TIF_MEMDIE 9 | |
116 | #define TIF_SECCOMP 10 /* secure computing */ | |
117 | #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ | |
118 | #define TIF_NOERROR 12 /* Force successful syscall return */ | |
119 | #define TIF_RESTORE_SIGMASK 13 /* Restore signal mask in do_signal */ | |
120 | #define TIF_FREEZE 14 /* Freezing for suspend */ | |
121 | #define TIF_RUNLATCH 15 /* Is the runlatch enabled? */ | |
122 | #define TIF_ABI_PENDING 16 /* 32/64 bit switch needed */ | |
1da177e4 LT |
123 | |
124 | /* as above, but as bit values */ | |
125 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
1da177e4 LT |
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) | |
f341973d AB |
130 | #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK) |
131 | #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW) | |
1da177e4 LT |
132 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
133 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
134 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
401d1f02 | 135 | #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) |
401d1f02 | 136 | #define _TIF_NOERROR (1<<TIF_NOERROR) |
f27201da | 137 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
8a102eed | 138 | #define _TIF_FREEZE (1<<TIF_FREEZE) |
f341973d AB |
139 | #define _TIF_RUNLATCH (1<<TIF_RUNLATCH) |
140 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) | |
1da177e4 LT |
141 | #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) |
142 | ||
a583f1b5 | 143 | #define _TIF_USER_WORK_MASK ( _TIF_SIGPENDING | \ |
1bd79336 PM |
144 | _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK) |
145 | #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) | |
1da177e4 | 146 | |
f39224a8 PM |
147 | /* Bits in local_flags */ |
148 | /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ | |
149 | #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ | |
150 | ||
151 | #define _TLF_NAPPING (1 << TLF_NAPPING) | |
152 | ||
1da177e4 LT |
153 | #endif /* __KERNEL__ */ |
154 | ||
6cb7bfeb | 155 | #endif /* _ASM_POWERPC_THREAD_INFO_H */ |