KEYS: Extend TIF_NOTIFY_RESUME to (almost) all architectures [try #6]
[linux-2.6.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;     /* thread address space:
33                                                    0-0xBFFFFFFF for user-thead
34                                                    0-0xFFFFFFFF for kernel-thread
35                                                 */
36         struct restart_block    restart_block;
37         struct pt_regs          *regs;
38 };
39
40 /*
41  * macros/functions for gaining access to the thread information structure
42  */
43 #define INIT_THREAD_INFO(tsk)                   \
44 {                                               \
45         .task           = &tsk,                 \
46         .exec_domain    = &default_exec_domain, \
47         .flags          = _TIF_FIXADE,          \
48         .cpu            = 0,                    \
49         .preempt_count  = INIT_PREEMPT_COUNT,   \
50         .addr_limit     = KERNEL_DS,            \
51         .restart_block  = {                     \
52                 .fn = do_no_restart_syscall,    \
53         },                                      \
54 }
55
56 #define init_thread_info        (init_thread_union.thread_info)
57 #define init_stack              (init_thread_union.stack)
58
59 /* How to get the thread information struct from C.  */
60 register struct thread_info *__current_thread_info __asm__("$28");
61 #define current_thread_info()  __current_thread_info
62
63 /* thread information allocation */
64 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
65 #define THREAD_SIZE_ORDER (1)
66 #endif
67 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
68 #define THREAD_SIZE_ORDER (2)
69 #endif
70 #ifdef CONFIG_PAGE_SIZE_8KB
71 #define THREAD_SIZE_ORDER (1)
72 #endif
73 #ifdef CONFIG_PAGE_SIZE_16KB
74 #define THREAD_SIZE_ORDER (0)
75 #endif
76 #ifdef CONFIG_PAGE_SIZE_32KB
77 #define THREAD_SIZE_ORDER (0)
78 #endif
79 #ifdef CONFIG_PAGE_SIZE_64KB
80 #define THREAD_SIZE_ORDER (0)
81 #endif
82
83 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
84 #define THREAD_MASK (THREAD_SIZE - 1UL)
85
86 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
87
88 #ifdef CONFIG_DEBUG_STACK_USAGE
89 #define alloc_thread_info(tsk)                                  \
90 ({                                                              \
91         struct thread_info *ret;                                \
92                                                                 \
93         ret = kzalloc(THREAD_SIZE, GFP_KERNEL);                 \
94                                                                 \
95         ret;                                                    \
96 })
97 #else
98 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
99 #endif
100
101 #define free_thread_info(info) kfree(info)
102
103 #endif /* !__ASSEMBLY__ */
104
105 #define PREEMPT_ACTIVE          0x10000000
106
107 /*
108  * thread information flags
109  * - these are process state flags that various assembly files may need to
110  *   access
111  * - pending work-to-be-done flags are in LSW
112  * - other flags in MSW
113  */
114 #define TIF_SIGPENDING          1       /* signal pending */
115 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
116 #define TIF_SYSCALL_AUDIT       3       /* syscall auditing active */
117 #define TIF_SECCOMP             4       /* secure computing */
118 #define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
119 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
120 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
121 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
122 #define TIF_MEMDIE              18
123 #define TIF_FREEZE              19
124 #define TIF_FIXADE              20      /* Fix address errors in software */
125 #define TIF_LOGADE              21      /* Log address errors to syslog */
126 #define TIF_32BIT_REGS          22      /* also implies 16/32 fprs */
127 #define TIF_32BIT_ADDR          23      /* 32-bit address space (o32/n32) */
128 #define TIF_FPUBOUND            24      /* thread bound to FPU-full CPU set */
129 #define TIF_LOAD_WATCH          25      /* If set, load watch registers */
130 #define TIF_SYSCALL_TRACE       31      /* syscall trace active */
131
132 #ifdef CONFIG_MIPS32_O32
133 #define TIF_32BIT TIF_32BIT_REGS
134 #elif defined(CONFIG_MIPS32_N32)
135 #define TIF_32BIT _TIF_32BIT_ADDR
136 #endif /* CONFIG_MIPS32_O32 */
137
138 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
139 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
140 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
141 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
142 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
143 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
144 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
145 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
146 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
147 #define _TIF_FREEZE             (1<<TIF_FREEZE)
148 #define _TIF_FIXADE             (1<<TIF_FIXADE)
149 #define _TIF_LOGADE             (1<<TIF_LOGADE)
150 #define _TIF_32BIT_REGS         (1<<TIF_32BIT_REGS)
151 #define _TIF_32BIT_ADDR         (1<<TIF_32BIT_ADDR)
152 #define _TIF_FPUBOUND           (1<<TIF_FPUBOUND)
153 #define _TIF_LOAD_WATCH         (1<<TIF_LOAD_WATCH)
154
155 /* work to do on interrupt/exception return */
156 #define _TIF_WORK_MASK          (0x0000ffef & ~_TIF_SECCOMP)
157 /* work to do on any return to u-space */
158 #define _TIF_ALLWORK_MASK       (0x8000ffff & ~_TIF_SECCOMP)
159
160 #endif /* __KERNEL__ */
161
162 #endif /* _ASM_THREAD_INFO_H */