include/asm-arm26/thread_info.h

   1 /*
   2  *  linux/include/asm-arm26/thread_info.h
   3  *
   4  *  Copyright (C) 2002 Russell King.
   5  *  Copyright (C) 2003 Ian Molton.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef __ASM_ARM_THREAD_INFO_H
  12 #define __ASM_ARM_THREAD_INFO_H
  13
  14 #ifdef __KERNEL__
  15
  16 #ifndef __ASSEMBLY__
  17
  18 struct task_struct;
  19 struct exec_domain;
  20
  21 #include <linux/compiler.h>
  22 #include <asm/fpstate.h>
  23 #include <asm/ptrace.h>
  24 #include <asm/types.h>
  25
  26 typedef unsigned long mm_segment_t;
  27
  28 struct cpu_context_save {
  29         __u32   r4;
  30         __u32   r5;
  31         __u32   r6;
  32         __u32   r7;
  33         __u32   r8;
  34         __u32   r9;
  35         __u32   sl;
  36         __u32   fp;
  37         __u32   sp;
  38         __u32   pc;
  39 };
  40
  41 /*
  42  * low level task data that entry.S needs immediate access to.
  43  * We assume cpu_context follows immedately after cpu_domain.
  44  */
  45 struct thread_info {
  46         unsigned long           flags;          /* low level flags */
  47         __s32                   preempt_count;  /* 0 => preemptable, <0 => bug */
  48         mm_segment_t            addr_limit;     /* address limit */
  49         struct task_struct      *task;          /* main task structure */
  50         struct exec_domain      *exec_domain;   /* execution domain */
  51         __u32                   cpu;            /* cpu */
  52         struct cpu_context_save cpu_context;    /* cpu context */
  53         struct restart_block    restart_block;
  54         union fp_state          fpstate;
  55 };
  56
  57 #define INIT_THREAD_INFO(tsk)                   \
  58 {                                               \
  59         .task           &tsk,                   \
  60         .exec_domain    &default_exec_domain,   \
  61         .flags          0,                      \
  62         .preempt_count  0,                      \
  63         .addr_limit     KERNEL_DS,              \
  64         .restart_block  = {                             \
  65                 .fn     = do_no_restart_syscall,        \
  66         },                                              \
  67 }
  68
  69 #define init_thread_info        (init_thread_union.thread_info)
  70 #define init_stack              (init_thread_union.stack)
  71
  72 /*
  73  * how to get the thread information struct from C
  74  */
  75 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  76
  77 static inline struct thread_info *current_thread_info(void)
  78 {
  79         register unsigned long sp asm ("sp");
  80         return (struct thread_info *)(sp & ~0x1fff);
  81 }
  82
  83 /* FIXME - PAGE_SIZE < 32K */
  84 #define THREAD_SIZE             (8*32768) // FIXME - this needs attention (see kernel/fork.c which gets a nice div by zero if this is lower than 8*32768
  85 #define __get_user_regs(x) (((struct pt_regs *)((unsigned long)(x) + THREAD_SIZE - 8)) - 1)
  86
  87 extern struct thread_info *alloc_thread_info(struct task_struct *task);
  88 extern void free_thread_info(struct thread_info *);
  89
  90 #define get_thread_info(ti)     get_task_struct((ti)->task)
  91 #define put_thread_info(ti)     put_task_struct((ti)->task)
  92
  93 #define thread_saved_pc(tsk)    \
  94         ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
  95 #define thread_saved_fp(tsk)    \
  96         ((unsigned long)((tsk)->thread_info->cpu_context.fp))
  97
  98 #else /* !__ASSEMBLY__ */
  99
 100 #define TI_FLAGS        0
 101 #define TI_PREEMPT      4
 102 #define TI_ADDR_LIMIT   8
 103 #define TI_TASK         12
 104 #define TI_EXEC_DOMAIN  16
 105 #define TI_CPU          20
 106 #define TI_CPU_SAVE     24
 107 #define TI_RESTART_BLOCK 28
 108 #define TI_FPSTATE      68
 109
 110 #endif
 111
 112 #define PREEMPT_ACTIVE  0x04000000
 113
 114 /*
 115  * thread information flags:
 116  *  TIF_SYSCALL_TRACE   - syscall trace active
 117  *  TIF_NOTIFY_RESUME   - resumption notification requested
 118  *  TIF_SIGPENDING      - signal pending
 119  *  TIF_NEED_RESCHED    - rescheduling necessary
 120  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 121  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 122  */
 123 #define TIF_NOTIFY_RESUME       0
 124 #define TIF_SIGPENDING          1
 125 #define TIF_NEED_RESCHED        2
 126 #define TIF_SYSCALL_TRACE       8
 127 #define TIF_USED_FPU            16
 128 #define TIF_POLLING_NRFLAG      17
 129 #define TIF_MEMDIE              18
 130
 131 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 132 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 133 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 134 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 135 #define _TIF_USED_FPU           (1 << TIF_USED_FPU)
 136 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 137
 138 /*
 139  * Change these and you break ASM code in entry-common.S
 140  */
 141 #define _TIF_WORK_MASK          0x000000ff
 142
 143 #endif /* __KERNEL__ */
 144 #endif /* __ASM_ARM_THREAD_INFO_H */