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Linux kernel mirror (for testing)
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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#ifdef CONFIG_PPC64
26#define CURRENT_THREAD_INFO(dest, sp) clrrdi dest, sp, THREAD_SHIFT
27#else
28#define CURRENT_THREAD_INFO(dest, sp) rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT
29#endif
30
31#ifndef __ASSEMBLY__
32#include <linux/cache.h>
33#include <asm/processor.h>
34#include <asm/page.h>
35#include <linux/stringify.h>
36
37/*
38 * low level task data.
39 */
40struct thread_info {
41 struct task_struct *task; /* main task structure */
42 struct exec_domain *exec_domain; /* execution domain */
43 int cpu; /* cpu we're on */
44 int preempt_count; /* 0 => preemptable,
45 <0 => BUG */
46 struct restart_block restart_block;
47 unsigned long local_flags; /* private flags for thread */
48
49 /* low level flags - has atomic operations done on it */
50 unsigned long flags ____cacheline_aligned_in_smp;
51};
52
53/*
54 * macros/functions for gaining access to the thread information structure
55 */
56#define INIT_THREAD_INFO(tsk) \
57{ \
58 .task = &tsk, \
59 .exec_domain = &default_exec_domain, \
60 .cpu = 0, \
61 .preempt_count = INIT_PREEMPT_COUNT, \
62 .restart_block = { \
63 .fn = do_no_restart_syscall, \
64 }, \
65 .flags = 0, \
66}
67
68#define init_thread_info (init_thread_union.thread_info)
69#define init_stack (init_thread_union.stack)
70
71#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
72
73/* how to get the thread information struct from C */
74static inline struct thread_info *current_thread_info(void)
75{
76 register unsigned long sp asm("r1");
77
78 /* gcc4, at least, is smart enough to turn this into a single
79 * rlwinm for ppc32 and clrrdi for ppc64 */
80 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
81}
82
83#endif /* __ASSEMBLY__ */
84
85#define PREEMPT_ACTIVE 0x10000000
86
87/*
88 * thread information flag bit numbers
89 */
90#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
91#define TIF_SIGPENDING 1 /* signal pending */
92#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
93#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
94 TIF_NEED_RESCHED */
95#define TIF_32BIT 4 /* 32 bit binary */
96#define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */
97#define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */
98#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
99#define TIF_SINGLESTEP 8 /* singlestepping active */
100#define TIF_MEMDIE 9 /* is terminating due to OOM killer */
101#define TIF_SECCOMP 10 /* secure computing */
102#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
103#define TIF_NOERROR 12 /* Force successful syscall return */
104#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
105#define TIF_UPROBE 14 /* breakpointed or single-stepping */
106#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
107#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
108 for stack store? */
109
110/* as above, but as bit values */
111#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
112#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
113#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
114#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
115#define _TIF_32BIT (1<<TIF_32BIT)
116#define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK)
117#define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW)
118#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
119#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
120#define _TIF_SECCOMP (1<<TIF_SECCOMP)
121#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
122#define _TIF_NOERROR (1<<TIF_NOERROR)
123#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
124#define _TIF_UPROBE (1<<TIF_UPROBE)
125#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
126#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
127#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
128 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)
129
130#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
131 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
132#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
133
134/* Bits in local_flags */
135/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
136#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
137#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
138#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
139#define TLF_LAZY_MMU 3 /* tlb_batch is active */
140#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
141
142#define _TLF_NAPPING (1 << TLF_NAPPING)
143#define _TLF_SLEEPING (1 << TLF_SLEEPING)
144#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
145#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
146#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
147
148#ifndef __ASSEMBLY__
149#define HAVE_SET_RESTORE_SIGMASK 1
150static inline void set_restore_sigmask(void)
151{
152 struct thread_info *ti = current_thread_info();
153 ti->local_flags |= _TLF_RESTORE_SIGMASK;
154 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
155}
156static inline void clear_restore_sigmask(void)
157{
158 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
159}
160static inline bool test_restore_sigmask(void)
161{
162 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
163}
164static inline bool test_and_clear_restore_sigmask(void)
165{
166 struct thread_info *ti = current_thread_info();
167 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
168 return false;
169 ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
170 return true;
171}
172
173static inline bool test_thread_local_flags(unsigned int flags)
174{
175 struct thread_info *ti = current_thread_info();
176 return (ti->local_flags & flags) != 0;
177}
178
179#ifdef CONFIG_PPC64
180#define is_32bit_task() (test_thread_flag(TIF_32BIT))
181#else
182#define is_32bit_task() (1)
183#endif
184
185#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
186
187#endif /* !__ASSEMBLY__ */
188
189#endif /* __KERNEL__ */
190
191#endif /* _ASM_POWERPC_THREAD_INFO_H */