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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) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
27#else
28#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(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#include <asm/accounting.h>
37
38/*
39 * low level task data.
40 */
41struct thread_info {
42 struct task_struct *task; /* main task structure */
43 int cpu; /* cpu we're on */
44 int preempt_count; /* 0 => preemptable,
45 <0 => BUG */
46 unsigned long local_flags; /* private flags for thread */
47#ifdef CONFIG_LIVEPATCH
48 unsigned long *livepatch_sp;
49#endif
50#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
51 struct cpu_accounting_data accounting;
52#endif
53 /* low level flags - has atomic operations done on it */
54 unsigned long flags ____cacheline_aligned_in_smp;
55};
56
57/*
58 * macros/functions for gaining access to the thread information structure
59 */
60#define INIT_THREAD_INFO(tsk) \
61{ \
62 .task = &tsk, \
63 .cpu = 0, \
64 .preempt_count = INIT_PREEMPT_COUNT, \
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 unsigned long val;
77
78 asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
79
80 return (struct thread_info *)val;
81}
82
83#endif /* __ASSEMBLY__ */
84
85/*
86 * thread information flag bit numbers
87 */
88#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
89#define TIF_SIGPENDING 1 /* signal pending */
90#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
91#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
92 TIF_NEED_RESCHED */
93#define TIF_32BIT 4 /* 32 bit binary */
94#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
95#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
96#define TIF_SINGLESTEP 8 /* singlestepping active */
97#define TIF_NOHZ 9 /* in adaptive nohz mode */
98#define TIF_SECCOMP 10 /* secure computing */
99#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
100#define TIF_NOERROR 12 /* Force successful syscall return */
101#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
102#define TIF_UPROBE 14 /* breakpointed or single-stepping */
103#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
104#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
105 for stack store? */
106#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
107#if defined(CONFIG_PPC64)
108#define TIF_ELF2ABI 18 /* function descriptors must die! */
109#endif
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_RESTORE_TM (1<<TIF_RESTORE_TM)
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_NOHZ (1<<TIF_NOHZ)
128#define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
129 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
130 _TIF_NOHZ)
131
132#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
133 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
134 _TIF_RESTORE_TM)
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_LAZY_MMU 3 /* tlb_batch is active */
142#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
143
144#define _TLF_NAPPING (1 << TLF_NAPPING)
145#define _TLF_SLEEPING (1 << TLF_SLEEPING)
146#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
147#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
148
149#ifndef __ASSEMBLY__
150
151static inline bool test_thread_local_flags(unsigned int flags)
152{
153 struct thread_info *ti = current_thread_info();
154 return (ti->local_flags & flags) != 0;
155}
156
157#ifdef CONFIG_PPC64
158#define is_32bit_task() (test_thread_flag(TIF_32BIT))
159#else
160#define is_32bit_task() (1)
161#endif
162
163#if defined(CONFIG_PPC64)
164#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
165#else
166#define is_elf2_task() (0)
167#endif
168
169#endif /* !__ASSEMBLY__ */
170
171#endif /* __KERNEL__ */
172
173#endif /* _ASM_POWERPC_THREAD_INFO_H */