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 LT |
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 */ | |
6cb7bfeb DG |
37 | int preempt_count; /* 0 => preemptable, |
38 | <0 => BUG */ | |
1da177e4 LT |
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 | ||
328985b2 DG |
68 | #if THREAD_SHIFT >= PAGE_SHIFT |
69 | ||
70 | #define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) | |
71 | ||
3c726f8d | 72 | #ifdef CONFIG_DEBUG_STACK_USAGE |
328985b2 | 73 | #define alloc_thread_info(tsk) \ |
3c726f8d BH |
74 | ((struct thread_info *)__get_free_pages(GFP_KERNEL | \ |
75 | __GFP_ZERO, THREAD_ORDER)) | |
76 | #else | |
77 | #define alloc_thread_info(tsk) \ | |
78 | ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER)) | |
79 | #endif | |
328985b2 DG |
80 | #define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER) |
81 | ||
82 | #else /* THREAD_SHIFT < PAGE_SHIFT */ | |
83 | ||
3c726f8d BH |
84 | #ifdef CONFIG_DEBUG_STACK_USAGE |
85 | #define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL) | |
86 | #else | |
87 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) | |
88 | #endif | |
1da177e4 | 89 | #define free_thread_info(ti) kfree(ti) |
328985b2 DG |
90 | |
91 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | |
92 | ||
1da177e4 LT |
93 | #define get_thread_info(ti) get_task_struct((ti)->task) |
94 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
95 | ||
96 | /* how to get the thread information struct from C */ | |
97 | static inline struct thread_info *current_thread_info(void) | |
98 | { | |
6cb7bfeb DG |
99 | register unsigned long sp asm("r1"); |
100 | ||
101 | /* gcc4, at least, is smart enough to turn this into a single | |
102 | * rlwinm for ppc32 and clrrdi for ppc64 */ | |
103 | return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); | |
1da177e4 LT |
104 | } |
105 | ||
106 | #endif /* __ASSEMBLY__ */ | |
107 | ||
108 | #define PREEMPT_ACTIVE 0x10000000 | |
109 | ||
110 | /* | |
111 | * thread information flag bit numbers | |
112 | */ | |
113 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
114 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
115 | #define TIF_SIGPENDING 2 /* signal pending */ | |
116 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
117 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling | |
118 | TIF_NEED_RESCHED */ | |
119 | #define TIF_32BIT 5 /* 32 bit binary */ | |
6dc2f0c7 | 120 | /* #define SPARE 6 */ |
1da177e4 LT |
121 | #define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */ |
122 | #define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */ | |
123 | #define TIF_SINGLESTEP 9 /* singlestepping active */ | |
124 | #define TIF_MEMDIE 10 | |
125 | #define TIF_SECCOMP 11 /* secure computing */ | |
126 | ||
127 | /* as above, but as bit values */ | |
128 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
129 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
130 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
131 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
132 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
133 | #define _TIF_32BIT (1<<TIF_32BIT) | |
6dc2f0c7 | 134 | /* #define _SPARE (1<<SPARE) */ |
1da177e4 LT |
135 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) |
136 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
137 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) | |
138 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
139 | #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) | |
140 | ||
141 | #define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \ | |
142 | _TIF_NEED_RESCHED) | |
143 | ||
144 | #endif /* __KERNEL__ */ | |
145 | ||
6cb7bfeb | 146 | #endif /* _ASM_POWERPC_THREAD_INFO_H */ |