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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/ptrace.h>
  28 #include <asm/types.h>
  29 #include <asm/domain.h>
  30
  31 typedef unsigned long mm_segment_t;
  32
  33 struct cpu_context_save {
  34         __u32   r4;
  35         __u32   r5;
  36         __u32   r6;
  37         __u32   r7;
  38         __u32   r8;
  39         __u32   r9;
  40         __u32   sl;
  41         __u32   fp;
  42         __u32   sp;
  43         __u32   pc;
  44         __u32   extra[2];               /* Xscale 'acc' register, etc */
  45 };
  46
  47 /*
  48  * low level task data that entry.S needs immediate access to.
  49  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  50  */
  51 struct thread_info {
  52         unsigned long           flags;          /* low level flags */
  53         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  54         mm_segment_t            addr_limit;     /* address limit */
  55         struct task_struct      *task;          /* main task structure */
  56         struct exec_domain      *exec_domain;   /* execution domain */
  57         __u32                   cpu;            /* cpu */
  58         __u32                   cpu_domain;     /* cpu domain */
  59         struct cpu_context_save cpu_context;    /* cpu context */
  60         __u8                    used_cp[16];    /* thread used copro */
  61         unsigned long           tp_value;
  62         union fp_state          fpstate __attribute__((aligned(8)));
  63         union vfp_state         vfpstate;
  64         struct restart_block    restart_block;
  65 };
  66
  67 #define INIT_THREAD_INFO(tsk)                                           \
  68 {                                                                       \
  69         .task           = &tsk,                                         \
  70         .exec_domain    = &default_exec_domain,                         \
  71         .flags          = 0,                                            \
  72         .preempt_count  = 1,                                            \
  73         .addr_limit     = KERNEL_DS,                                    \
  74         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
  75                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
  76                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
  77         .restart_block  = {                                             \
  78                 .fn     = do_no_restart_syscall,                        \
  79         },                                                              \
  80 }
  81
  82 #define init_thread_info        (init_thread_union.thread_info)
  83 #define init_stack              (init_thread_union.stack)
  84
  85 /*
  86  * how to get the thread information struct from C
  87  */
  88 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  89
  90 static inline struct thread_info *current_thread_info(void)
  91 {
  92         register unsigned long sp asm ("sp");
  93         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
  94 }
  95
  96 extern struct thread_info *alloc_thread_info(struct task_struct *task);
  97 extern void free_thread_info(struct thread_info *);
  98
  99 #define thread_saved_pc(tsk)    \
 100         ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
 101 #define thread_saved_fp(tsk)    \
 102         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 103
 104 extern void iwmmxt_task_disable(struct thread_info *);
 105 extern void iwmmxt_task_copy(struct thread_info *, void *);
 106 extern void iwmmxt_task_restore(struct thread_info *, void *);
 107 extern void iwmmxt_task_release(struct thread_info *);
 108
 109 #endif
 110
 111 /*
 112  * We use bit 30 of the preempt_count to indicate that kernel
 113  * preemption is occuring.  See include/asm-arm/hardirq.h.
 114  */
 115 #define PREEMPT_ACTIVE  0x40000000
 116
 117 /*
 118  * thread information flags:
 119  *  TIF_SYSCALL_TRACE   - syscall trace active
 120  *  TIF_NOTIFY_RESUME   - resumption notification requested
 121  *  TIF_SIGPENDING      - signal pending
 122  *  TIF_NEED_RESCHED    - rescheduling necessary
 123  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 124  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 125  */
 126 #define TIF_NOTIFY_RESUME       0
 127 #define TIF_SIGPENDING          1
 128 #define TIF_NEED_RESCHED        2
 129 #define TIF_SYSCALL_TRACE       8
 130 #define TIF_POLLING_NRFLAG      16
 131 #define TIF_USING_IWMMXT        17
 132 #define TIF_MEMDIE              18
 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_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 139 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 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 */