arch/unicore32/include/asm/thread_info.h

   1 /*
   2  * linux/arch/unicore32/include/asm/thread_info.h
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #ifndef __UNICORE_THREAD_INFO_H__
  13 #define __UNICORE_THREAD_INFO_H__
  14
  15 #ifdef __KERNEL__
  16
  17 #include <linux/compiler.h>
  18 #include <asm/fpstate.h>
  19
  20 #define THREAD_SIZE_ORDER       1
  21 #define THREAD_SIZE             8192
  22 #define THREAD_START_SP         (THREAD_SIZE - 8)
  23
  24 #ifndef __ASSEMBLY__
  25
  26 struct task_struct;
  27 struct exec_domain;
  28
  29 #include <asm/types.h>
  30
  31 typedef struct {
  32         unsigned long seg;
  33 } mm_segment_t;
  34
  35 struct cpu_context_save {
  36         __u32   r4;
  37         __u32   r5;
  38         __u32   r6;
  39         __u32   r7;
  40         __u32   r8;
  41         __u32   r9;
  42         __u32   r10;
  43         __u32   r11;
  44         __u32   r12;
  45         __u32   r13;
  46         __u32   r14;
  47         __u32   r15;
  48         __u32   r16;
  49         __u32   r17;
  50         __u32   r18;
  51         __u32   r19;
  52         __u32   r20;
  53         __u32   r21;
  54         __u32   r22;
  55         __u32   r23;
  56         __u32   r24;
  57         __u32   r25;
  58         __u32   r26;
  59         __u32   fp;
  60         __u32   sp;
  61         __u32   pc;
  62 };
  63
  64 /*
  65  * low level task data that entry.S needs immediate access to.
  66  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  67  */
  68 struct thread_info {
  69         unsigned long           flags;          /* low level flags */
  70         int                     preempt_count;  /* 0 => preemptable */
  71                                                 /* <0 => bug */
  72         mm_segment_t            addr_limit;     /* address limit */
  73         struct task_struct      *task;          /* main task structure */
  74         struct exec_domain      *exec_domain;   /* execution domain */
  75         __u32                   cpu;            /* cpu */
  76         struct cpu_context_save cpu_context;    /* cpu context */
  77         __u32                   syscall;        /* syscall number */
  78         __u8                    used_cp[16];    /* thread used copro */
  79 #ifdef CONFIG_UNICORE_FPU_F64
  80         struct fp_state         fpstate __attribute__((aligned(8)));
  81 #endif
  82         struct restart_block    restart_block;
  83 };
  84
  85 #define INIT_THREAD_INFO(tsk)                                           \
  86 {                                                                       \
  87         .task           = &tsk,                                         \
  88         .exec_domain    = &default_exec_domain,                         \
  89         .flags          = 0,                                            \
  90         .preempt_count  = INIT_PREEMPT_COUNT,                           \
  91         .addr_limit     = KERNEL_DS,                                    \
  92         .restart_block  = {                                             \
  93                 .fn     = do_no_restart_syscall,                        \
  94         },                                                              \
  95 }
  96
  97 #define init_thread_info        (init_thread_union.thread_info)
  98 #define init_stack              (init_thread_union.stack)
  99
 100 /*
 101  * how to get the thread information struct from C
 102  */
 103 static inline struct thread_info *current_thread_info(void) __attribute_const__;
 104
 105 static inline struct thread_info *current_thread_info(void)
 106 {
 107         register unsigned long sp asm ("sp");
 108         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
 109 }
 110
 111 #define thread_saved_pc(tsk)    \
 112         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 113 #define thread_saved_sp(tsk)    \
 114         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 115 #define thread_saved_fp(tsk)    \
 116         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 117
 118 #endif
 119
 120 /*
 121  * We use bit 30 of the preempt_count to indicate that kernel
 122  * preemption is occurring.  See <asm/hardirq.h>.
 123  */
 124 #define PREEMPT_ACTIVE  0x40000000
 125
 126 /*
 127  * thread information flags:
 128  *  TIF_SYSCALL_TRACE   - syscall trace active
 129  *  TIF_SIGPENDING      - signal pending
 130  *  TIF_NEED_RESCHED    - rescheduling necessary
 131  *  TIF_NOTIFY_RESUME   - callback before returning to user
 132  */
 133 #define TIF_SIGPENDING          0
 134 #define TIF_NEED_RESCHED        1
 135 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 136 #define TIF_SYSCALL_TRACE       8
 137 #define TIF_MEMDIE              18
 138 #define TIF_FREEZE              19
 139 #define TIF_RESTORE_SIGMASK     20
 140
 141 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 142 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 143 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 144 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 145 #define _TIF_FREEZE             (1 << TIF_FREEZE)
 146 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 147
 148 /*
 149  * Change these and you break ASM code in entry-common.S
 150  */
 151 #define _TIF_WORK_MASK          0x000000ff
 152
 153 #endif /* __KERNEL__ */
 154 #endif /* __UNICORE_THREAD_INFO_H__ */