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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#include <linux/config.h>
13
14#ifndef __ASSEMBLY__
15
16#include <asm/processor.h>
17
18/*
19 * low level task data that entry.S needs immediate access to
20 * - this struct should fit entirely inside of one cache line
21 * - this struct shares the supervisor stack pages
22 * - if the contents of this structure are changed, the assembly constants
23 * must also be changed
24 */
25struct thread_info {
26 struct task_struct *task; /* main task structure */
27 struct exec_domain *exec_domain; /* execution domain */
28 unsigned long flags; /* low level flags */
29 unsigned long tp_value; /* thread pointer */
30 __u32 cpu; /* current CPU */
31 int preempt_count; /* 0 => preemptable, <0 => BUG */
32
33 mm_segment_t addr_limit; /* thread address space:
34 0-0xBFFFFFFF for user-thead
35 0-0xFFFFFFFF for kernel-thread
36 */
37 struct restart_block restart_block;
38};
39
40/*
41 * macros/functions for gaining access to the thread information structure
42 *
43 * preempt_count needs to be 1 initially, until the scheduler is functional.
44 */
45#define INIT_THREAD_INFO(tsk) \
46{ \
47 .task = &tsk, \
48 .exec_domain = &default_exec_domain, \
49 .flags = 0, \
50 .cpu = 0, \
51 .preempt_count = 1, \
52 .addr_limit = KERNEL_DS, \
53 .restart_block = { \
54 .fn = do_no_restart_syscall, \
55 }, \
56}
57
58#define init_thread_info (init_thread_union.thread_info)
59#define init_stack (init_thread_union.stack)
60
61/* How to get the thread information struct from C. */
62register struct thread_info *__current_thread_info __asm__("$28");
63#define current_thread_info() __current_thread_info
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_64KB
79#define THREAD_SIZE_ORDER (0)
80#endif
81
82#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
83#define THREAD_MASK (THREAD_SIZE - 1UL)
84
85#ifdef CONFIG_DEBUG_STACK_USAGE
86#define alloc_thread_info(tsk) \
87({ \
88 struct thread_info *ret; \
89 \
90 ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
91 if (ret) \
92 memset(ret, 0, THREAD_SIZE); \
93 ret; \
94})
95#else
96#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
97#endif
98
99#define free_thread_info(info) kfree(info)
100#define get_thread_info(ti) get_task_struct((ti)->task)
101#define put_thread_info(ti) put_task_struct((ti)->task)
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_NOTIFY_RESUME 1 /* resumption notification requested */
115#define TIF_SIGPENDING 2 /* signal pending */
116#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
117#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
118#define TIF_SECCOMP 5 /* secure computing */
119#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
120#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
121#define TIF_MEMDIE 18
122#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
123
124#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
125#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
126#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
127#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
128#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
129#define _TIF_SECCOMP (1<<TIF_SECCOMP)
130#define _TIF_USEDFPU (1<<TIF_USEDFPU)
131#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
132
133/* work to do on interrupt/exception return */
134#define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP)
135/* work to do on any return to u-space */
136#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
137
138#endif /* __KERNEL__ */
139
140#endif /* _ASM_THREAD_INFO_H */