2 * linux/include/asm-arm/thread_info.h
4 * Copyright (C) 2002 Russell King.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #ifndef __ASM_ARM_THREAD_INFO_H
11 #define __ASM_ARM_THREAD_INFO_H
15 #include <linux/compiler.h>
16 #include <asm/fpstate.h>
18 #define THREAD_SIZE_ORDER 1
19 #define THREAD_SIZE 8192
20 #define THREAD_START_SP (THREAD_SIZE - 8)
27 #include <asm/ptrace.h>
28 #include <asm/types.h>
29 #include <asm/domain.h>
31 typedef unsigned long mm_segment_t;
33 struct cpu_context_save {
44 __u32 extra[2]; /* Xscale 'acc' register, etc */
48 * low level task data that entry.S needs immediate access to.
49 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
52 unsigned long flags; /* low level flags */
53 int preempt_count; /* 0 => preemptable, <0 => bug */
54 mm_segment_t addr_limit; /* address limit */
55 struct task_struct *task; /* main task structure */
56 struct exec_domain *exec_domain; /* execution domain */
58 __u32 cpu_domain; /* cpu domain */
59 struct cpu_context_save cpu_context; /* cpu context */
60 __u8 used_cp[16]; /* thread used copro */
61 unsigned long tp_value;
62 union fp_state fpstate __attribute__((aligned(8)));
63 union vfp_state vfpstate;
64 struct restart_block restart_block;
67 #define INIT_THREAD_INFO(tsk) \
70 .exec_domain = &default_exec_domain, \
73 .addr_limit = KERNEL_DS, \
74 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
75 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
76 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
78 .fn = do_no_restart_syscall, \
82 #define init_thread_info (init_thread_union.thread_info)
83 #define init_stack (init_thread_union.stack)
86 * how to get the thread information struct from C
88 static inline struct thread_info *current_thread_info(void) __attribute_const__;
90 static inline struct thread_info *current_thread_info(void)
92 register unsigned long sp asm ("sp");
93 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
96 extern struct thread_info *alloc_thread_info(struct task_struct *task);
97 extern void free_thread_info(struct thread_info *);
99 #define thread_saved_pc(tsk) \
100 ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
101 #define thread_saved_fp(tsk) \
102 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
104 extern void iwmmxt_task_disable(struct thread_info *);
105 extern void iwmmxt_task_copy(struct thread_info *, void *);
106 extern void iwmmxt_task_restore(struct thread_info *, void *);
107 extern void iwmmxt_task_release(struct thread_info *);
112 * We use bit 30 of the preempt_count to indicate that kernel
113 * preemption is occuring. See include/asm-arm/hardirq.h.
115 #define PREEMPT_ACTIVE 0x40000000
118 * thread information flags:
119 * TIF_SYSCALL_TRACE - syscall trace active
120 * TIF_NOTIFY_RESUME - resumption notification requested
121 * TIF_SIGPENDING - signal pending
122 * TIF_NEED_RESCHED - rescheduling necessary
123 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
124 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
126 #define TIF_NOTIFY_RESUME 0
127 #define TIF_SIGPENDING 1
128 #define TIF_NEED_RESCHED 2
129 #define TIF_SYSCALL_TRACE 8
130 #define TIF_POLLING_NRFLAG 16
131 #define TIF_USING_IWMMXT 17
132 #define TIF_MEMDIE 18
134 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
135 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
136 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
137 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
138 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
139 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
142 * Change these and you break ASM code in entry-common.S
144 #define _TIF_WORK_MASK 0x000000ff
146 #endif /* __KERNEL__ */
147 #endif /* __ASM_ARM_THREAD_INFO_H */