Merge tag 'v3.10.55' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / mips / include / asm / thread_info.h
1 /* thread_info.h: MIPS low-level thread information
2 *
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5 */
6
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
9
10 #ifdef __KERNEL__
11
12
13 #ifndef __ASSEMBLY__
14
15 #include <asm/processor.h>
16
17 /*
18 * low level task data that entry.S needs immediate access to
19 * - this struct should fit entirely inside of one cache line
20 * - this struct shares the supervisor stack pages
21 * - if the contents of this structure are changed, the assembly constants
22 * must also be changed
23 */
24 struct thread_info {
25 struct task_struct *task; /* main task structure */
26 struct exec_domain *exec_domain; /* execution domain */
27 unsigned long flags; /* low level flags */
28 unsigned long tp_value; /* thread pointer */
29 __u32 cpu; /* current CPU */
30 int preempt_count; /* 0 => preemptable, <0 => BUG */
31
32 mm_segment_t addr_limit; /*
33 * thread address space limit:
34 * 0x7fffffff for user-thead
35 * 0xffffffff for kernel-thread
36 */
37 struct restart_block restart_block;
38 struct pt_regs *regs;
39 };
40
41 /*
42 * macros/functions for gaining access to the thread information structure
43 */
44 #define INIT_THREAD_INFO(tsk) \
45 { \
46 .task = &tsk, \
47 .exec_domain = &default_exec_domain, \
48 .flags = _TIF_FIXADE, \
49 .cpu = 0, \
50 .preempt_count = INIT_PREEMPT_COUNT, \
51 .addr_limit = KERNEL_DS, \
52 .restart_block = { \
53 .fn = do_no_restart_syscall, \
54 }, \
55 }
56
57 #define init_thread_info (init_thread_union.thread_info)
58 #define init_stack (init_thread_union.stack)
59
60 /* How to get the thread information struct from C. */
61 static inline struct thread_info *current_thread_info(void)
62 {
63 register struct thread_info *__current_thread_info __asm__("$28");
64
65 return __current_thread_info;
66 }
67
68 #endif /* !__ASSEMBLY__ */
69
70 /* thread information allocation */
71 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
72 #define THREAD_SIZE_ORDER (1)
73 #endif
74 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
75 #define THREAD_SIZE_ORDER (2)
76 #endif
77 #ifdef CONFIG_PAGE_SIZE_8KB
78 #define THREAD_SIZE_ORDER (1)
79 #endif
80 #ifdef CONFIG_PAGE_SIZE_16KB
81 #define THREAD_SIZE_ORDER (0)
82 #endif
83 #ifdef CONFIG_PAGE_SIZE_32KB
84 #define THREAD_SIZE_ORDER (0)
85 #endif
86 #ifdef CONFIG_PAGE_SIZE_64KB
87 #define THREAD_SIZE_ORDER (0)
88 #endif
89
90 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
91 #define THREAD_MASK (THREAD_SIZE - 1UL)
92
93 #define STACK_WARN (THREAD_SIZE / 8)
94
95 #define PREEMPT_ACTIVE 0x10000000
96
97 /*
98 * thread information flags
99 * - these are process state flags that various assembly files may need to
100 * access
101 * - pending work-to-be-done flags are in LSW
102 * - other flags in MSW
103 */
104 #define TIF_SIGPENDING 1 /* signal pending */
105 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
106 #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
107 #define TIF_SECCOMP 4 /* secure computing */
108 #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
109 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
110 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
111 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
112 #define TIF_FIXADE 20 /* Fix address errors in software */
113 #define TIF_LOGADE 21 /* Log address errors to syslog */
114 #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
115 #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
116 #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
117 #define TIF_LOAD_WATCH 25 /* If set, load watch registers */
118 #define TIF_SYSCALL_TRACE 31 /* syscall trace active */
119
120 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
121 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
122 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
123 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
124 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
125 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
126 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
127 #define _TIF_FIXADE (1<<TIF_FIXADE)
128 #define _TIF_LOGADE (1<<TIF_LOGADE)
129 #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
130 #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
131 #define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
132 #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
133
134 #define _TIF_WORK_SYSCALL_ENTRY (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
135
136 /* work to do in syscall_trace_leave() */
137 #define _TIF_WORK_SYSCALL_EXIT (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
138
139 /* work to do on interrupt/exception return */
140 #define _TIF_WORK_MASK \
141 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
142 /* work to do on any return to u-space */
143 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)
144
145 #endif /* __KERNEL__ */
146
147 #endif /* _ASM_THREAD_INFO_H */