include/asm-arm/thread_info.h

   1 /*
   2  *  linux/include/asm-arm/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 #ifndef __ASSEMBLY__
  16
  17 struct task_struct;
  18 struct exec_domain;
  19
  20 #include <asm/fpstate.h>
  21 #include <asm/ptrace.h>
  22 #include <asm/types.h>
  23 #include <asm/domain.h>
  24
  25 typedef unsigned long mm_segment_t;
  26
  27 struct cpu_context_save {
  28         __u32   r4;
  29         __u32   r5;
  30         __u32   r6;
  31         __u32   r7;
  32         __u32   r8;
  33         __u32   r9;
  34         __u32   sl;
  35         __u32   fp;
  36         __u32   sp;
  37         __u32   pc;
  38         __u32   extra[2];               /* Xscale 'acc' register, etc */
  39 };
  40
  41 /*
  42  * low level task data that entry.S needs immediate access to.
  43  * __switch_to() assumes cpu_context follows immediately 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         __u32                   cpu_domain;     /* cpu domain */
  53         struct cpu_context_save cpu_context;    /* cpu context */
  54         __u8                    used_cp[16];    /* thread used copro */
  55         union fp_state          fpstate;
  56         struct restart_block    restart_block;
  57 };
  58
  59 #define INIT_THREAD_INFO(tsk)                                           \
  60 {                                                                       \
  61         .task           = &tsk,                                         \
  62         .exec_domain    = &default_exec_domain,                         \
  63         .flags          = 0,                                            \
  64         .preempt_count  = 1,                                            \
  65         .addr_limit     = KERNEL_DS,                                    \
  66         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  67                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  68                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  69         .restart_block  = {                                             \
  70                 .fn     = do_no_restart_syscall,                        \
  71         },                                                              \
  72 }
  73
  74 #define init_thread_info        (init_thread_union.thread_info)
  75 #define init_stack              (init_thread_union.stack)
  76
  77 /*
  78  * how to get the thread information struct from C
  79  */
  80 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  81
  82 static inline struct thread_info *current_thread_info(void)
  83 {
  84         register unsigned long sp asm ("sp");
  85         return (struct thread_info *)(sp & ~0x1fff);
  86 }
  87
  88 #define THREAD_SIZE             (8192)
  89
  90 extern struct thread_info *alloc_thread_info(struct task_struct *task);
  91 extern void free_thread_info(struct thread_info *);
  92
  93 #define get_thread_info(ti)     get_task_struct((ti)->task)
  94 #define put_thread_info(ti)     put_task_struct((ti)->task)
  95
  96 #define thread_saved_pc(tsk)    \
  97         ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
  98 #define thread_saved_fp(tsk)    \
  99         ((unsigned long)((tsk)->thread_info->cpu_context.fp))
 100
 101 #else /* !__ASSEMBLY__ */
 102
 103 #define TI_FLAGS        0
 104 #define TI_PREEMPT      4
 105 #define TI_ADDR_LIMIT   8
 106 #define TI_TASK         12
 107 #define TI_EXEC_DOMAIN  16
 108 #define TI_CPU          20
 109 #define TI_CPU_DOMAIN   24
 110 #define TI_CPU_SAVE     28
 111 #define TI_USED_CP      76
 112 #define TI_FPSTATE      (TI_USED_CP+16)
 113
 114 #endif
 115
 116 #define PREEMPT_ACTIVE  0x04000000
 117
 118 /*
 119  * thread information flags:
 120  *  TIF_SYSCALL_TRACE   - syscall trace active
 121  *  TIF_NOTIFY_RESUME   - resumption notification requested
 122  *  TIF_SIGPENDING      - signal pending
 123  *  TIF_NEED_RESCHED    - rescheduling necessary
 124  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 125  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 126  */
 127 #define TIF_NOTIFY_RESUME       0
 128 #define TIF_SIGPENDING          1
 129 #define TIF_NEED_RESCHED        2
 130 #define TIF_SYSCALL_TRACE       8
 131 #define TIF_USED_FPU            16
 132 #define TIF_POLLING_NRFLAG      17
 133
 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_USED_FPU           (1 << TIF_USED_FPU)
 139 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 140
 141 /*
 142  * Change these and you break ASM code in entry-common.S
 143  */
 144 #define _TIF_WORK_MASK          0x000000ff
 145
 146 #endif /* __KERNEL__ */
 147 #endif /* __ASM_ARM_THREAD_INFO_H */