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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#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 */
34struct 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 * preempt_count needs to be 1 initially, until the scheduler is functional.
51 */
52#define INIT_THREAD_INFO(tsk) \
53{ \
54 .task = &tsk, \
55 .exec_domain = &default_exec_domain, \
56 .cpu = 0, \
57 .preempt_count = 1, \
58 .restart_block = { \
59 .fn = do_no_restart_syscall, \
60 }, \
61 .flags = 0, \
62}
63
64#define init_thread_info (init_thread_union.thread_info)
65#define init_stack (init_thread_union.stack)
66
67/* thread information allocation */
68
69#if THREAD_SHIFT >= PAGE_SHIFT
70
71#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
72
73#else /* THREAD_SHIFT < PAGE_SHIFT */
74
75#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
76
77extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
78extern void free_thread_info(struct thread_info *ti);
79
80#endif /* THREAD_SHIFT < PAGE_SHIFT */
81
82/* how to get the thread information struct from C */
83static inline struct thread_info *current_thread_info(void)
84{
85 register unsigned long sp asm("r1");
86
87 /* gcc4, at least, is smart enough to turn this into a single
88 * rlwinm for ppc32 and clrrdi for ppc64 */
89 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
90}
91
92#endif /* __ASSEMBLY__ */
93
94#define PREEMPT_ACTIVE 0x10000000
95
96/*
97 * thread information flag bit numbers
98 */
99#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
100#define TIF_SIGPENDING 1 /* signal pending */
101#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
102#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
103 TIF_NEED_RESCHED */
104#define TIF_32BIT 4 /* 32 bit binary */
105#define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */
106#define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */
107#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
108#define TIF_SINGLESTEP 8 /* singlestepping active */
109#define TIF_MEMDIE 9
110#define TIF_SECCOMP 10 /* secure computing */
111#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
112#define TIF_NOERROR 12 /* Force successful syscall return */
113#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
114#define TIF_FREEZE 14 /* Freezing for suspend */
115#define TIF_RUNLATCH 15 /* Is the runlatch enabled? */
116#define TIF_ABI_PENDING 16 /* 32/64 bit switch needed */
117
118/* as above, but as bit values */
119#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
120#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
121#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
122#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
123#define _TIF_32BIT (1<<TIF_32BIT)
124#define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK)
125#define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW)
126#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
127#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
128#define _TIF_SECCOMP (1<<TIF_SECCOMP)
129#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
130#define _TIF_NOERROR (1<<TIF_NOERROR)
131#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
132#define _TIF_FREEZE (1<<TIF_FREEZE)
133#define _TIF_RUNLATCH (1<<TIF_RUNLATCH)
134#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
135#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
136
137#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
138 _TIF_NOTIFY_RESUME)
139#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
140
141/* Bits in local_flags */
142/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
143#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
144#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
145#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
146
147#define _TLF_NAPPING (1 << TLF_NAPPING)
148#define _TLF_SLEEPING (1 << TLF_SLEEPING)
149#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
150
151#ifndef __ASSEMBLY__
152#define HAVE_SET_RESTORE_SIGMASK 1
153static 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
160#ifdef CONFIG_PPC64
161#define is_32bit_task() (test_thread_flag(TIF_32BIT))
162#else
163#define is_32bit_task() (1)
164#endif
165
166#endif /* !__ASSEMBLY__ */
167
168#endif /* __KERNEL__ */
169
170#endif /* _ASM_POWERPC_THREAD_INFO_H */