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 #if defined(CONFIG_PPC64)
16 #define THREAD_SHIFT 14
17 #elif defined(CONFIG_PPC_256K_PAGES)
18 #define THREAD_SHIFT 15
19 #else
20 #define THREAD_SHIFT 13
21 #endif
22
23 #define THREAD_SIZE (1 << THREAD_SHIFT)
24
25 #ifndef __ASSEMBLY__
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 */
38 int preempt_count; /* 0 => preemptable,
39 <0 => BUG */
40 struct restart_block restart_block;
41 unsigned long local_flags; /* private flags for thread */
42
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
49 */
50 #define INIT_THREAD_INFO(tsk) \
51 { \
52 .task = &tsk, \
53 .exec_domain = &default_exec_domain, \
54 .cpu = 0, \
55 .preempt_count = INIT_PREEMPT_COUNT, \
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
67 #if THREAD_SHIFT >= PAGE_SHIFT
68
69 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
70
71 #else /* THREAD_SHIFT < PAGE_SHIFT */
72
73 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
74
75 extern struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node);
76 extern void free_thread_info(struct thread_info *ti);
77
78 #endif /* THREAD_SHIFT < PAGE_SHIFT */
79
80 /* how to get the thread information struct from C */
current_thread_info(void)81 static inline struct thread_info *current_thread_info(void)
82 {
83 register unsigned long sp asm("r1");
84
85 /* gcc4, at least, is smart enough to turn this into a single
86 * rlwinm for ppc32 and clrrdi for ppc64 */
87 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
88 }
89
90 #endif /* __ASSEMBLY__ */
91
92 #define PREEMPT_ACTIVE 0x10000000
93
94 /*
95 * thread information flag bit numbers
96 */
97 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
98 #define TIF_SIGPENDING 1 /* signal pending */
99 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
100 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
101 TIF_NEED_RESCHED */
102 #define TIF_32BIT 4 /* 32 bit binary */
103 #define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */
104 #define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */
105 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
106 #define TIF_SINGLESTEP 8 /* singlestepping active */
107 #define TIF_MEMDIE 9 /* is terminating due to OOM killer */
108 #define TIF_SECCOMP 10 /* secure computing */
109 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
110 #define TIF_NOERROR 12 /* Force successful syscall return */
111 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
112 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
113
114 /* as above, but as bit values */
115 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
116 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
117 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
118 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
119 #define _TIF_32BIT (1<<TIF_32BIT)
120 #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK)
121 #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW)
122 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
123 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
124 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
125 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
126 #define _TIF_NOERROR (1<<TIF_NOERROR)
127 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
128 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
129 #define _TIF_RUNLATCH (1<<TIF_RUNLATCH)
130 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
131 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)
132
133 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
134 _TIF_NOTIFY_RESUME)
135 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
136
137 /* Bits in local_flags */
138 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
139 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */
140 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
141 #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
142 #define TLF_LAZY_MMU 3 /* tlb_batch is active */
143 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
144
145 #define _TLF_NAPPING (1 << TLF_NAPPING)
146 #define _TLF_SLEEPING (1 << TLF_SLEEPING)
147 #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
148 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
149 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
150
151 #ifndef __ASSEMBLY__
152 #define HAVE_SET_RESTORE_SIGMASK 1
set_restore_sigmask(void)153 static inline void set_restore_sigmask(void)
154 {
155 struct thread_info *ti = current_thread_info();
156 ti->local_flags |= _TLF_RESTORE_SIGMASK;
157 set_bit(TIF_SIGPENDING, &ti->flags);
158 }
159
test_thread_local_flags(unsigned int flags)160 static inline bool test_thread_local_flags(unsigned int flags)
161 {
162 struct thread_info *ti = current_thread_info();
163 return (ti->local_flags & flags) != 0;
164 }
165
166 #ifdef CONFIG_PPC64
167 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
168 #else
169 #define is_32bit_task() (1)
170 #endif
171
172 #endif /* !__ASSEMBLY__ */
173
174 #endif /* __KERNEL__ */
175
176 #endif /* _ASM_POWERPC_THREAD_INFO_H */
177