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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
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 */
Ralf Baechle3c370262005-04-13 17:43:59 +000028 unsigned long tp_value; /* thread pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 __u32 cpu; /* current CPU */
Jesper Juhldcd497f2005-06-23 00:09:07 -070030 int preempt_count; /* 0 => preemptable, <0 => BUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32 mm_segment_t addr_limit; /* thread address space:
Ralf Baechlea3dddd52006-03-11 08:18:41 +000033 0-0xBFFFFFFF for user-thead
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 0-0xFFFFFFFF for kernel-thread
35 */
36 struct restart_block restart_block;
Ralf Baechle937a8012006-10-07 19:44:33 +010037 struct pt_regs *regs;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038};
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, \
Ralf Baechle293c5bd2007-07-25 16:19:33 +010049 .flags = _TIF_FIXADE, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 .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 */
Ralf Baechle875d43e2005-09-03 15:56:16 -070066#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#define THREAD_SIZE_ORDER (1)
68#endif
Ralf Baechle875d43e2005-09-03 15:56:16 -070069#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#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 \
Mariusz Kozlowski185bcd12007-07-31 20:48:41 +020090 ret = kzalloc(THREAD_SIZE, GFP_KERNEL); \
91 \
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 ret; \
93})
94#else
95#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
96#endif
97
98#define free_thread_info(info) kfree(info)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100#endif /* !__ASSEMBLY__ */
101
102#define PREEMPT_ACTIVE 0x10000000
103
104/*
105 * thread information flags
106 * - these are process state flags that various assembly files may need to
107 * access
108 * - pending work-to-be-done flags are in LSW
109 * - other flags in MSW
110 */
111#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
112#define TIF_SIGPENDING 2 /* signal pending */
113#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
114#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
Ralf Baechle127c6f62005-03-18 17:36:42 +0000115#define TIF_SECCOMP 5 /* secure computing */
Ralf Baechle7b3e2fc2006-02-08 12:58:41 +0000116#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
118#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
119#define TIF_MEMDIE 18
Ralf Baechle89c07fd2007-01-24 12:31:47 +0000120#define TIF_FREEZE 19
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100121#define TIF_FIXADE 20 /* Fix address errors in software */
122#define TIF_LOGADE 21 /* Log address errors to syslog */
123#define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
124#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
125#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
127
128#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
129#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
130#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
131#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
132#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
Ralf Baechle127c6f62005-03-18 17:36:42 +0000133#define _TIF_SECCOMP (1<<TIF_SECCOMP)
Ralf Baechle7b3e2fc2006-02-08 12:58:41 +0000134#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135#define _TIF_USEDFPU (1<<TIF_USEDFPU)
136#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
Ralf Baechle89c07fd2007-01-24 12:31:47 +0000137#define _TIF_FREEZE (1<<TIF_FREEZE)
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100138#define _TIF_FIXADE (1<<TIF_FIXADE)
139#define _TIF_LOGADE (1<<TIF_LOGADE)
140#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
141#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
142#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Ralf Baechle127c6f62005-03-18 17:36:42 +0000144/* work to do on interrupt/exception return */
145#define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP)
146/* work to do on any return to u-space */
147#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149#endif /* __KERNEL__ */
150
151#endif /* _ASM_THREAD_INFO_H */