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David Gibson6cb7bfe2005-10-21 15:45:50 +10001/* thread_info.h: PowerPC low-level thread information
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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
David Gibson6cb7bfe2005-10-21 15:45:50 +10008#ifndef _ASM_POWERPC_THREAD_INFO_H
9#define _ASM_POWERPC_THREAD_INFO_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11#ifdef __KERNEL__
12
David Gibson6cb7bfe2005-10-21 15:45:50 +100013/* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#ifndef __ASSEMBLY__
24#include <linux/config.h>
25#include <linux/cache.h>
26#include <asm/processor.h>
27#include <asm/page.h>
28#include <linux/stringify.h>
29
30/*
31 * low level task data.
32 */
33struct thread_info {
34 struct task_struct *task; /* main task structure */
35 struct exec_domain *exec_domain; /* execution domain */
36 int cpu; /* cpu we're on */
David Gibson6cb7bfe2005-10-21 15:45:50 +100037 int preempt_count; /* 0 => preemptable,
38 <0 => BUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 struct restart_block restart_block;
40 /* set by force_successful_syscall_return */
41 unsigned char syscall_noerror;
42 /* low level flags - has atomic operations done on it */
43 unsigned long flags ____cacheline_aligned_in_smp;
44};
45
46/*
47 * macros/functions for gaining access to the thread information structure
48 *
49 * preempt_count needs to be 1 initially, until the scheduler is functional.
50 */
51#define INIT_THREAD_INFO(tsk) \
52{ \
53 .task = &tsk, \
54 .exec_domain = &default_exec_domain, \
55 .cpu = 0, \
56 .preempt_count = 1, \
57 .restart_block = { \
58 .fn = do_no_restart_syscall, \
59 }, \
60 .flags = 0, \
61}
62
63#define init_thread_info (init_thread_union.thread_info)
64#define init_stack (init_thread_union.stack)
65
66/* thread information allocation */
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#ifdef CONFIG_DEBUG_STACK_USAGE
69#define alloc_thread_info(tsk) \
70 ({ \
71 struct thread_info *ret; \
72 \
73 ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
74 if (ret) \
75 memset(ret, 0, THREAD_SIZE); \
76 ret; \
77 })
78#else
David Gibson6cb7bfe2005-10-21 15:45:50 +100079#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#endif
81#define free_thread_info(ti) kfree(ti)
82#define get_thread_info(ti) get_task_struct((ti)->task)
83#define put_thread_info(ti) put_task_struct((ti)->task)
84
85/* how to get the thread information struct from C */
86static inline struct thread_info *current_thread_info(void)
87{
David Gibson6cb7bfe2005-10-21 15:45:50 +100088 register unsigned long sp asm("r1");
89
90 /* gcc4, at least, is smart enough to turn this into a single
91 * rlwinm for ppc32 and clrrdi for ppc64 */
92 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95#endif /* __ASSEMBLY__ */
96
97#define PREEMPT_ACTIVE 0x10000000
98
99/*
100 * thread information flag bit numbers
101 */
102#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
103#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
104#define TIF_SIGPENDING 2 /* signal pending */
105#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
106#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
107 TIF_NEED_RESCHED */
108#define TIF_32BIT 5 /* 32 bit binary */
Anton Blanchard6dc2f0c2005-06-02 14:02:02 -0700109/* #define SPARE 6 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */
111#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */
112#define TIF_SINGLESTEP 9 /* singlestepping active */
113#define TIF_MEMDIE 10
114#define TIF_SECCOMP 11 /* secure computing */
115
116/* as above, but as bit values */
117#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
118#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
119#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
120#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
121#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
122#define _TIF_32BIT (1<<TIF_32BIT)
Anton Blanchard6dc2f0c2005-06-02 14:02:02 -0700123/* #define _SPARE (1<<SPARE) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
125#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
126#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
127#define _TIF_SECCOMP (1<<TIF_SECCOMP)
128#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
129
130#define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
131 _TIF_NEED_RESCHED)
132
133#endif /* __KERNEL__ */
134
David Gibson6cb7bfe2005-10-21 15:45:50 +1000135#endif /* _ASM_POWERPC_THREAD_INFO_H */