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   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 #ifdef CONFIG_ARM_THUMBEE
  66         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
  67 #endif
  68         struct restart_block    restart_block;
  69 };
  70
  71 #define INIT_THREAD_INFO(tsk)                                           \
  72 {                                                                       \
  73         .task           = &tsk,                                         \
  74         .exec_domain    = &default_exec_domain,                         \
  75         .flags          = 0,                                            \
  76         .preempt_count  = 1,                                            \
  77         .addr_limit     = KERNEL_DS,                                    \
  78         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  79                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  80                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  81         .restart_block  = {                                             \
  82                 .fn     = do_no_restart_syscall,                        \
  83         },                                                              \
  84 }
  85
  86 #define init_thread_info        (init_thread_union.thread_info)
  87 #define init_stack              (init_thread_union.stack)
  88
  89 /*
  90  * how to get the thread information struct from C
  91  */
  92 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  93
  94 static inline struct thread_info *current_thread_info(void)
  95 {
  96         register unsigned long sp asm ("sp");
  97         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
  98 }
  99
 100 /* thread information allocation */
 101 #ifdef CONFIG_DEBUG_STACK_USAGE
 102 #define alloc_thread_info(tsk) \
 103         ((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \
 104                 THREAD_SIZE_ORDER))
 105 #else
 106 #define alloc_thread_info(tsk) \
 107         ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
 108 #endif
 109
 110 #define free_thread_info(info) \
 111         free_pages((unsigned long)info, THREAD_SIZE_ORDER);
 112
 113 #define thread_saved_pc(tsk)    \
 114         ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
 115 #define thread_saved_fp(tsk)    \
 116         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 117
 118 extern void crunch_task_disable(struct thread_info *);
 119 extern void crunch_task_copy(struct thread_info *, void *);
 120 extern void crunch_task_restore(struct thread_info *, void *);
 121 extern void crunch_task_release(struct thread_info *);
 122
 123 extern void iwmmxt_task_disable(struct thread_info *);
 124 extern void iwmmxt_task_copy(struct thread_info *, void *);
 125 extern void iwmmxt_task_restore(struct thread_info *, void *);
 126 extern void iwmmxt_task_release(struct thread_info *);
 127 extern void iwmmxt_task_switch(struct thread_info *);
 128
 129 #endif
 130
 131 /*
 132  * We use bit 30 of the preempt_count to indicate that kernel
 133  * preemption is occurring.  See include/asm-arm/hardirq.h.
 134  */
 135 #define PREEMPT_ACTIVE  0x40000000
 136
 137 /*
 138  * thread information flags:
 139  *  TIF_SYSCALL_TRACE   - syscall trace active
 140  *  TIF_SIGPENDING      - signal pending
 141  *  TIF_NEED_RESCHED    - rescheduling necessary
 142  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 143  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 144  */
 145 #define TIF_SIGPENDING          0
 146 #define TIF_NEED_RESCHED        1
 147 #define TIF_SYSCALL_TRACE       8
 148 #define TIF_POLLING_NRFLAG      16
 149 #define TIF_USING_IWMMXT        17
 150 #define TIF_MEMDIE              18
 151 #define TIF_FREEZE              19
 152
 153 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 154 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 155 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 156 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 157 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 158 #define _TIF_FREEZE             (1 << TIF_FREEZE)
 159
 160 /*
 161  * Change these and you break ASM code in entry-common.S
 162  */
 163 #define _TIF_WORK_MASK          0x000000ff
 164
 165 #endif /* __KERNEL__ */
 166 #endif /* __ASM_ARM_THREAD_INFO_H */