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Linux/arch/arm/include/asm/thread_info.h

  1 /*
  2  *  arch/arm/include/asm/thread_info.h
  3  *
  4  *  Copyright (C) 2002 Russell King.
  5  *
  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.
  9  */
 10 #ifndef __ASM_ARM_THREAD_INFO_H
 11 #define __ASM_ARM_THREAD_INFO_H
 12 
 13 #ifdef __KERNEL__
 14 
 15 #include <linux/compiler.h>
 16 #include <asm/fpstate.h>
 17 
 18 #define THREAD_SIZE_ORDER       1
 19 #define THREAD_SIZE             8192
 20 #define THREAD_START_SP         (THREAD_SIZE - 8)
 21 
 22 #ifndef __ASSEMBLY__
 23 
 24 struct task_struct;
 25 struct exec_domain;
 26 
 27 #include <asm/types.h>
 28 #include <asm/domain.h>
 29 
 30 typedef unsigned long mm_segment_t;
 31 
 32 struct cpu_context_save {
 33         __u32   r4;
 34         __u32   r5;
 35         __u32   r6;
 36         __u32   r7;
 37         __u32   r8;
 38         __u32   r9;
 39         __u32   sl;
 40         __u32   fp;
 41         __u32   sp;
 42         __u32   pc;
 43         __u32   extra[2];               /* Xscale 'acc' register, etc */
 44 };
 45 
 46 struct arm_restart_block {
 47         union {
 48                 /* For user cache flushing */
 49                 struct {
 50                         unsigned long start;
 51                         unsigned long end;
 52                 } cache;
 53         };
 54 };
 55 
 56 /*
 57  * low level task data that entry.S needs immediate access to.
 58  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 59  */
 60 struct thread_info {
 61         unsigned long           flags;          /* low level flags */
 62         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
 63         mm_segment_t            addr_limit;     /* address limit */
 64         struct task_struct      *task;          /* main task structure */
 65         struct exec_domain      *exec_domain;   /* execution domain */
 66         __u32                   cpu;            /* cpu */
 67         __u32                   cpu_domain;     /* cpu domain */
 68         struct cpu_context_save cpu_context;    /* cpu context */
 69         __u32                   syscall;        /* syscall number */
 70         __u8                    used_cp[16];    /* thread used copro */
 71         unsigned long           tp_value[2];    /* TLS registers */
 72 #ifdef CONFIG_CRUNCH
 73         struct crunch_state     crunchstate;
 74 #endif
 75         union fp_state          fpstate __attribute__((aligned(8)));
 76         union vfp_state         vfpstate;
 77 #ifdef CONFIG_ARM_THUMBEE
 78         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
 79 #endif
 80         struct restart_block    restart_block;
 81         struct arm_restart_block        arm_restart_block;
 82 };
 83 
 84 #define INIT_THREAD_INFO(tsk)                                           \
 85 {                                                                       \
 86         .task           = &tsk,                                         \
 87         .exec_domain    = &default_exec_domain,                         \
 88         .flags          = 0,                                            \
 89         .preempt_count  = INIT_PREEMPT_COUNT,                           \
 90         .addr_limit     = KERNEL_DS,                                    \
 91         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
 92                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
 93                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
 94         .restart_block  = {                                             \
 95                 .fn     = do_no_restart_syscall,                        \
 96         },                                                              \
 97 }
 98 
 99 #define init_thread_info        (init_thread_union.thread_info)
100 #define init_stack              (init_thread_union.stack)
101 
102 /*
103  * how to get the thread information struct from C
104  */
105 static inline struct thread_info *current_thread_info(void) __attribute_const__;
106 
107 static inline struct thread_info *current_thread_info(void)
108 {
109         register unsigned long sp asm ("sp");
110         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
111 }
112 
113 #define thread_saved_pc(tsk)    \
114         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
115 #define thread_saved_sp(tsk)    \
116         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
117 #define thread_saved_fp(tsk)    \
118         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
119 
120 extern void crunch_task_disable(struct thread_info *);
121 extern void crunch_task_copy(struct thread_info *, void *);
122 extern void crunch_task_restore(struct thread_info *, void *);
123 extern void crunch_task_release(struct thread_info *);
124 
125 extern void iwmmxt_task_disable(struct thread_info *);
126 extern void iwmmxt_task_copy(struct thread_info *, void *);
127 extern void iwmmxt_task_restore(struct thread_info *, void *);
128 extern void iwmmxt_task_release(struct thread_info *);
129 extern void iwmmxt_task_switch(struct thread_info *);
130 
131 extern void vfp_sync_hwstate(struct thread_info *);
132 extern void vfp_flush_hwstate(struct thread_info *);
133 
134 struct user_vfp;
135 struct user_vfp_exc;
136 
137 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
138                                            struct user_vfp_exc __user *);
139 extern int vfp_restore_user_hwstate(struct user_vfp __user *,
140                                     struct user_vfp_exc __user *);
141 #endif
142 
143 /*
144  * thread information flags:
145  *  TIF_SYSCALL_TRACE   - syscall trace active
146  *  TIF_SYSCAL_AUDIT    - syscall auditing active
147  *  TIF_SIGPENDING      - signal pending
148  *  TIF_NEED_RESCHED    - rescheduling necessary
149  *  TIF_NOTIFY_RESUME   - callback before returning to user
150  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
151  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
152  */
153 #define TIF_SIGPENDING          0
154 #define TIF_NEED_RESCHED        1
155 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
156 #define TIF_SYSCALL_TRACE       8
157 #define TIF_SYSCALL_AUDIT       9
158 #define TIF_SYSCALL_TRACEPOINT  10
159 #define TIF_SECCOMP             11      /* seccomp syscall filtering active */
160 #define TIF_NOHZ                12      /* in adaptive nohz mode */
161 #define TIF_USING_IWMMXT        17
162 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
163 #define TIF_RESTORE_SIGMASK     20
164 
165 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
166 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
167 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
168 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
169 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
170 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
171 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
172 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
173 
174 /* Checks for any syscall work in entry-common.S */
175 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
176                            _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
177 
178 /*
179  * Change these and you break ASM code in entry-common.S
180  */
181 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME)
182 
183 #endif /* __KERNEL__ */
184 #endif /* __ASM_ARM_THREAD_INFO_H */
185 

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