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 */
40 struct 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 */
current_thread_info(void)74 static 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_NOHZ 9 /* in adaptive nohz mode */
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 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
110
111 /* as above, but as bit values */
112 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
113 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
114 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
115 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
116 #define _TIF_32BIT (1<<TIF_32BIT)
117 #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK)
118 #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW)
119 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
120 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
121 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
122 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
123 #define _TIF_NOERROR (1<<TIF_NOERROR)
124 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
125 #define _TIF_UPROBE (1<<TIF_UPROBE)
126 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
127 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
128 #define _TIF_NOHZ (1<<TIF_NOHZ)
129 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
130 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
131 _TIF_NOHZ)
132
133 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
134 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
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 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
158 }
clear_restore_sigmask(void)159 static inline void clear_restore_sigmask(void)
160 {
161 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
162 }
test_restore_sigmask(void)163 static inline bool test_restore_sigmask(void)
164 {
165 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
166 }
test_and_clear_restore_sigmask(void)167 static inline bool test_and_clear_restore_sigmask(void)
168 {
169 struct thread_info *ti = current_thread_info();
170 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
171 return false;
172 ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
173 return true;
174 }
175
test_thread_local_flags(unsigned int flags)176 static inline bool test_thread_local_flags(unsigned int flags)
177 {
178 struct thread_info *ti = current_thread_info();
179 return (ti->local_flags & flags) != 0;
180 }
181
182 #ifdef CONFIG_PPC64
183 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
184 #else
185 #define is_32bit_task() (1)
186 #endif
187
188 #endif /* !__ASSEMBLY__ */
189
190 #endif /* __KERNEL__ */
191
192 #endif /* _ASM_POWERPC_THREAD_INFO_H */
193