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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
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 */
24struct 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. */
61register struct thread_info *__current_thread_info __asm__("$28");
62#define current_thread_info() __current_thread_info
63
64#endif /* !__ASSEMBLY__ */
65
66/* thread information allocation */
67#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
68#define THREAD_SIZE_ORDER (1)
69#endif
70#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
71#define THREAD_SIZE_ORDER (2)
72#endif
73#ifdef CONFIG_PAGE_SIZE_8KB
74#define THREAD_SIZE_ORDER (1)
75#endif
76#ifdef CONFIG_PAGE_SIZE_16KB
77#define THREAD_SIZE_ORDER (0)
78#endif
79#ifdef CONFIG_PAGE_SIZE_32KB
80#define THREAD_SIZE_ORDER (0)
81#endif
82#ifdef CONFIG_PAGE_SIZE_64KB
83#define THREAD_SIZE_ORDER (0)
84#endif
85
86#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
87#define THREAD_MASK (THREAD_SIZE - 1UL)
88
89#define STACK_WARN (THREAD_SIZE / 8)
90
91#define PREEMPT_ACTIVE 0x10000000
92
93/*
94 * thread information flags
95 * - these are process state flags that various assembly files may need to
96 * access
97 * - pending work-to-be-done flags are in LSW
98 * - other flags in MSW
99 */
100#define TIF_SIGPENDING 1 /* signal pending */
101#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
102#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
103#define TIF_SECCOMP 4 /* secure computing */
104#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
105#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
106#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
107#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
108#define TIF_FIXADE 20 /* Fix address errors in software */
109#define TIF_LOGADE 21 /* Log address errors to syslog */
110#define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
111#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
112#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
113#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
114#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
115
116#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
117#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
118#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
119#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
120#define _TIF_SECCOMP (1<<TIF_SECCOMP)
121#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
122#define _TIF_USEDFPU (1<<TIF_USEDFPU)
123#define _TIF_FIXADE (1<<TIF_FIXADE)
124#define _TIF_LOGADE (1<<TIF_LOGADE)
125#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
126#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
127#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
128#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
129
130/* work to do in syscall_trace_leave() */
131#define _TIF_WORK_SYSCALL_EXIT (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
132
133/* work to do on interrupt/exception return */
134#define _TIF_WORK_MASK \
135 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
136/* work to do on any return to u-space */
137#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)
138
139#endif /* __KERNEL__ */
140
141#endif /* _ASM_THREAD_INFO_H */