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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_ORDER (THREAD_SHIFT - PAGE_SHIFT)
70
71#ifdef CONFIG_DEBUG_STACK_USAGE
72#define alloc_thread_info(tsk) \
73 ((struct thread_info *)__get_free_pages(GFP_KERNEL | \
74 __GFP_ZERO, THREAD_ORDER))
75#else
76#define alloc_thread_info(tsk) \
77 ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER))
78#endif
79#define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER)
80
81#else /* THREAD_SHIFT < PAGE_SHIFT */
82
83extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
84extern void free_thread_info(struct thread_info *ti);
85
86#endif /* THREAD_SHIFT < PAGE_SHIFT */
87
88/* how to get the thread information struct from C */
89static inline struct thread_info *current_thread_info(void)
90{
91 register unsigned long sp asm("r1");
92
93 /* gcc4, at least, is smart enough to turn this into a single
94 * rlwinm for ppc32 and clrrdi for ppc64 */
95 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
96}
97
98#endif /* __ASSEMBLY__ */
99
100#define PREEMPT_ACTIVE 0x10000000
101
102/*
103 * thread information flag bit numbers
104 */
105#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
106#define TIF_SIGPENDING 1 /* signal pending */
107#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
108#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
109 TIF_NEED_RESCHED */
110#define TIF_32BIT 4 /* 32 bit binary */
111#define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */
112#define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */
113#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
114#define TIF_SINGLESTEP 8 /* singlestepping active */
115#define TIF_MEMDIE 9
116#define TIF_SECCOMP 10 /* secure computing */
117#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
118#define TIF_NOERROR 12 /* Force successful syscall return */
119#define TIF_RESTORE_SIGMASK 13 /* Restore signal mask in do_signal */
120#define TIF_FREEZE 14 /* Freezing for suspend */
121#define TIF_RUNLATCH 15 /* Is the runlatch enabled? */
122#define TIF_ABI_PENDING 16 /* 32/64 bit switch needed */
123
124/* as above, but as bit values */
125#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
126#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
127#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
128#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
129#define _TIF_32BIT (1<<TIF_32BIT)
130#define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK)
131#define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW)
132#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
133#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
134#define _TIF_SECCOMP (1<<TIF_SECCOMP)
135#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
136#define _TIF_NOERROR (1<<TIF_NOERROR)
137#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
138#define _TIF_FREEZE (1<<TIF_FREEZE)
139#define _TIF_RUNLATCH (1<<TIF_RUNLATCH)
140#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
141#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
142
143#define _TIF_USER_WORK_MASK ( _TIF_SIGPENDING | \
144 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)
145#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
146
147/* Bits in local_flags */
148/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
149#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
150
151#define _TLF_NAPPING (1 << TLF_NAPPING)
152
153#endif /* __KERNEL__ */
154
155#endif /* _ASM_POWERPC_THREAD_INFO_H */