1 /* thread_info.h: PowerPC low-level thread information
2 * adapted from the i386 version by Paul Mackerras
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
8 #ifndef _ASM_POWERPC_THREAD_INFO_H
9 #define _ASM_POWERPC_THREAD_INFO_H
13 /* We have 8k stacks on ppc32 and 16k on ppc64 */
15 #if defined(CONFIG_PPC64)
16 #define THREAD_SHIFT 14
17 #elif defined(CONFIG_PPC_256K_PAGES)
18 #define THREAD_SHIFT 15
20 #define THREAD_SHIFT 13
23 #define THREAD_SIZE (1 << THREAD_SHIFT)
26 #define CURRENT_THREAD_INFO(dest, sp) clrrdi dest, sp, THREAD_SHIFT
28 #define CURRENT_THREAD_INFO(dest, sp) rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT
32 #include <linux/cache.h>
33 #include <asm/processor.h>
35 #include <linux/stringify.h>
38 * low level task data.
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,
46 struct restart_block restart_block;
47 unsigned long local_flags; /* private flags for thread */
49 /* low level flags - has atomic operations done on it */
50 unsigned long flags ____cacheline_aligned_in_smp;
54 * macros/functions for gaining access to the thread information structure
56 #define INIT_THREAD_INFO(tsk) \
59 .exec_domain = &default_exec_domain, \
61 .preempt_count = INIT_PREEMPT_COUNT, \
63 .fn = do_no_restart_syscall, \
68 #define init_thread_info (init_thread_union.thread_info)
69 #define init_stack (init_thread_union.stack)
71 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
73 /* how to get the thread information struct from C */
74 static inline struct thread_info *current_thread_info(void)
76 register unsigned long sp asm("r1");
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));
83 #endif /* __ASSEMBLY__ */
85 #define PREEMPT_ACTIVE 0x10000000
88 * thread information flag bit numbers
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
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
109 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
110 #if defined(CONFIG_PPC64)
111 #define TIF_ELF2ABI 18 /* function descriptors must die! */
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_UPROBE (1<<TIF_UPROBE)
129 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
130 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
131 #define _TIF_NOHZ (1<<TIF_NOHZ)
132 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
133 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
136 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
137 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
138 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
140 /* Bits in local_flags */
141 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
142 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */
143 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
144 #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
145 #define TLF_LAZY_MMU 3 /* tlb_batch is active */
146 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
148 #define _TLF_NAPPING (1 << TLF_NAPPING)
149 #define _TLF_SLEEPING (1 << TLF_SLEEPING)
150 #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
151 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
152 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
155 #define HAVE_SET_RESTORE_SIGMASK 1
156 static inline void set_restore_sigmask(void)
158 struct thread_info *ti = current_thread_info();
159 ti->local_flags |= _TLF_RESTORE_SIGMASK;
160 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
162 static inline void clear_restore_sigmask(void)
164 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
166 static inline bool test_restore_sigmask(void)
168 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
170 static inline bool test_and_clear_restore_sigmask(void)
172 struct thread_info *ti = current_thread_info();
173 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
175 ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
179 static inline bool test_thread_local_flags(unsigned int flags)
181 struct thread_info *ti = current_thread_info();
182 return (ti->local_flags & flags) != 0;
186 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
188 #define is_32bit_task() (1)
191 #if defined(CONFIG_PPC64)
192 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
194 #define is_elf2_task() (0)
197 #endif /* !__ASSEMBLY__ */
199 #endif /* __KERNEL__ */
201 #endif /* _ASM_POWERPC_THREAD_INFO_H */