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 #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 /*
  47  * low level task data that entry.S needs immediate access to.
  48  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  49  */
  50 struct thread_info {
  51         unsigned long           flags;          /* low level flags */
  52         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  53         mm_segment_t            addr_limit;     /* address limit */
  54         struct task_struct      *task;          /* main task structure */
  55         struct exec_domain      *exec_domain;   /* execution domain */
  56         __u32                   cpu;            /* cpu */
  57         __u32                   cpu_domain;     /* cpu domain */
  58         struct cpu_context_save cpu_context;    /* cpu context */
  59         __u32                   syscall;        /* syscall number */
  60         __u8                    used_cp[16];    /* thread used copro */
  61         unsigned long           tp_value;
  62         struct crunch_state     crunchstate;
  63         union fp_state          fpstate __attribute__((aligned(8)));
  64         union vfp_state         vfpstate;
  65         struct restart_block    restart_block;
  66 };
  67
  68 #define INIT_THREAD_INFO(tsk)                                           \
  69 {                                                                       \
  70         .task           = &tsk,                                         \
  71         .exec_domain    = &default_exec_domain,                         \
  72         .flags          = 0,                                            \
  73         .preempt_count  = 1,                                            \
  74         .addr_limit     = KERNEL_DS,                                    \
  75         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  76                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  77                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  78         .restart_block  = {                                             \
  79                 .fn     = do_no_restart_syscall,                        \
  80         },                                                              \
  81 }
  82
  83 #define init_thread_info        (init_thread_union.thread_info)
  84 #define init_stack              (init_thread_union.stack)
  85
  86 /*
  87  * how to get the thread information struct from C
  88  */
  89 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  90
  91 static inline struct thread_info *current_thread_info(void)
  92 {
  93         register unsigned long sp asm ("sp");
  94         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
  95 }
  96
  97 /* thread information allocation */
  98 #ifdef CONFIG_DEBUG_STACK_USAGE
  99 #define alloc_thread_info(tsk) \
 100         ((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \
 101                 THREAD_SIZE_ORDER))
 102 #else
 103 #define alloc_thread_info(tsk) \
 104         ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
 105 #endif
 106
 107 #define free_thread_info(info) \
 108         free_pages((unsigned long)info, THREAD_SIZE_ORDER);
 109
 110 #define thread_saved_pc(tsk)    \
 111         ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
 112 #define thread_saved_fp(tsk)    \
 113         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 114
 115 extern void crunch_task_disable(struct thread_info *);
 116 extern void crunch_task_copy(struct thread_info *, void *);
 117 extern void crunch_task_restore(struct thread_info *, void *);
 118 extern void crunch_task_release(struct thread_info *);
 119
 120 extern void iwmmxt_task_disable(struct thread_info *);
 121 extern void iwmmxt_task_copy(struct thread_info *, void *);
 122 extern void iwmmxt_task_restore(struct thread_info *, void *);
 123 extern void iwmmxt_task_release(struct thread_info *);
 124 extern void iwmmxt_task_switch(struct thread_info *);
 125
 126 #endif
 127
 128 /*
 129  * We use bit 30 of the preempt_count to indicate that kernel
 130  * preemption is occurring.  See include/asm-arm/hardirq.h.
 131  */
 132 #define PREEMPT_ACTIVE  0x40000000
 133
 134 /*
 135  * thread information flags:
 136  *  TIF_SYSCALL_TRACE   - syscall trace active
 137  *  TIF_SIGPENDING      - signal pending
 138  *  TIF_NEED_RESCHED    - rescheduling necessary
 139  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 140  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 141  */
 142 #define TIF_SIGPENDING          0
 143 #define TIF_NEED_RESCHED        1
 144 #define TIF_SYSCALL_TRACE       8
 145 #define TIF_POLLING_NRFLAG      16
 146 #define TIF_USING_IWMMXT        17
 147 #define TIF_MEMDIE              18
 148 #define TIF_FREEZE              19
 149
 150 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 151 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 152 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 153 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 154 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 155 #define _TIF_FREEZE             (1 << TIF_FREEZE)
 156
 157 /*
 158  * Change these and you break ASM code in entry-common.S
 159  */
 160 #define _TIF_WORK_MASK          0x000000ff
 161
 162 #endif /* __KERNEL__ */
 163 #endif /* __ASM_ARM_THREAD_INFO_H */