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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#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
23#ifndef __ASSEMBLY__
24#include <linux/cache.h>
25#include <asm/processor.h>
26#include <asm/page.h>
27#include <linux/stringify.h>
28
29/*
30 * low level task data.
31 */
32struct thread_info {
33 struct task_struct *task; /* main task structure */
34 struct exec_domain *exec_domain; /* execution domain */
35 int cpu; /* cpu we're on */
36 int preempt_count; /* 0 => preemptable,
37 <0 => BUG */
38 struct restart_block restart_block;
39 unsigned long local_flags; /* private flags for thread */
40
41 /* low level flags - has atomic operations done on it */
42 unsigned long flags ____cacheline_aligned_in_smp;
43};
44
45/*
46 * macros/functions for gaining access to the thread information structure
47 *
48 * preempt_count needs to be 1 initially, until the scheduler is functional.
49 */
50#define INIT_THREAD_INFO(tsk) \
51{ \
52 .task = &tsk, \
53 .exec_domain = &default_exec_domain, \
54 .cpu = 0, \
55 .preempt_count = 1, \
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
75extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
76extern 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 */
81static 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
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_FREEZE 14 /* Freezing for suspend */
113#define TIF_RUNLATCH 15 /* Is the runlatch enabled? */
114#define TIF_ABI_PENDING 16 /* 32/64 bit switch needed */
115
116/* as above, but as bit values */
117#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
118#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
119#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
120#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
121#define _TIF_32BIT (1<<TIF_32BIT)
122#define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK)
123#define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW)
124#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
125#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
126#define _TIF_SECCOMP (1<<TIF_SECCOMP)
127#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
128#define _TIF_NOERROR (1<<TIF_NOERROR)
129#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
130#define _TIF_FREEZE (1<<TIF_FREEZE)
131#define _TIF_RUNLATCH (1<<TIF_RUNLATCH)
132#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
133#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
134
135#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
136 _TIF_NOTIFY_RESUME)
137#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
138
139/* Bits in local_flags */
140/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
141#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
142#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
143#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
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
149#ifndef __ASSEMBLY__
150#define HAVE_SET_RESTORE_SIGMASK 1
151static inline void set_restore_sigmask(void)
152{
153 struct thread_info *ti = current_thread_info();
154 ti->local_flags |= _TLF_RESTORE_SIGMASK;
155 set_bit(TIF_SIGPENDING, &ti->flags);
156}
157#endif /* !__ASSEMBLY__ */
158
159#endif /* __KERNEL__ */
160
161#endif /* _ASM_POWERPC_THREAD_INFO_H */