xref: /linux/arch/mips/include/asm/thread_info.h (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
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 #endif /* !__ASSEMBLY__ */
64 
65 /* thread information allocation */
66 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
67 #define THREAD_SIZE_ORDER (1)
68 #endif
69 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
70 #define THREAD_SIZE_ORDER (2)
71 #endif
72 #ifdef CONFIG_PAGE_SIZE_8KB
73 #define THREAD_SIZE_ORDER (1)
74 #endif
75 #ifdef CONFIG_PAGE_SIZE_16KB
76 #define THREAD_SIZE_ORDER (0)
77 #endif
78 #ifdef CONFIG_PAGE_SIZE_32KB
79 #define THREAD_SIZE_ORDER (0)
80 #endif
81 #ifdef CONFIG_PAGE_SIZE_64KB
82 #define THREAD_SIZE_ORDER (0)
83 #endif
84 
85 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
86 #define THREAD_MASK (THREAD_SIZE - 1UL)
87 
88 #define STACK_WARN	(THREAD_SIZE / 8)
89 
90 #define PREEMPT_ACTIVE		0x10000000
91 
92 /*
93  * thread information flags
94  * - these are process state flags that various assembly files may need to
95  *   access
96  * - pending work-to-be-done flags are in LSW
97  * - other flags in MSW
98  */
99 #define TIF_SIGPENDING		1	/* signal pending */
100 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
101 #define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
102 #define TIF_SECCOMP		4	/* secure computing */
103 #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
104 #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
105 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
106 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
107 #define TIF_FIXADE		20	/* Fix address errors in software */
108 #define TIF_LOGADE		21	/* Log address errors to syslog */
109 #define TIF_32BIT_REGS		22	/* also implies 16/32 fprs */
110 #define TIF_32BIT_ADDR		23	/* 32-bit address space (o32/n32) */
111 #define TIF_FPUBOUND		24	/* thread bound to FPU-full CPU set */
112 #define TIF_LOAD_WATCH		25	/* If set, load watch registers */
113 #define TIF_SYSCALL_TRACE	31	/* syscall trace active */
114 
115 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
116 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
117 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
118 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
119 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
120 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
121 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
122 #define _TIF_FIXADE		(1<<TIF_FIXADE)
123 #define _TIF_LOGADE		(1<<TIF_LOGADE)
124 #define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
125 #define _TIF_32BIT_ADDR		(1<<TIF_32BIT_ADDR)
126 #define _TIF_FPUBOUND		(1<<TIF_FPUBOUND)
127 #define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)
128 
129 /* work to do in syscall_trace_leave() */
130 #define _TIF_WORK_SYSCALL_EXIT	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
131 
132 /* work to do on interrupt/exception return */
133 #define _TIF_WORK_MASK		\
134 	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
135 /* work to do on any return to u-space */
136 #define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)
137 
138 #endif /* __KERNEL__ */
139 
140 #endif /* _ASM_THREAD_INFO_H */
141