kernel/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
  28 #include <asm/types.h>
  29
  30 typedef struct {
  31         unsigned long seg;
  32 } mm_segment_t;
  33
  34 struct cpu_context_save {
  35         __u32   r4;
  36         __u32   r5;
  37         __u32   r6;
  38         __u32   r7;
  39         __u32   r8;
  40         __u32   r9;
  41         __u32   r10;
  42         __u32   r11;
  43         __u32   r12;
  44         __u32   r13;
  45         __u32   r14;
  46         __u32   r15;
  47         __u32   r16;
  48         __u32   r17;
  49         __u32   r18;
  50         __u32   r19;
  51         __u32   r20;
  52         __u32   r21;
  53         __u32   r22;
  54         __u32   r23;
  55         __u32   r24;
  56         __u32   r25;
  57         __u32   r26;
  58         __u32   fp;
  59         __u32   sp;
  60         __u32   pc;
  61 };
  62
  63 /*
  64  * low level task data that entry.S needs immediate access to.
  65  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  66  */
  67 struct thread_info {
  68         unsigned long           flags;          /* low level flags */
  69         int                     preempt_count;  /* 0 => preemptable */
  70                                                 /* <0 => bug */
  71         mm_segment_t            addr_limit;     /* address limit */
  72         struct task_struct      *task;          /* main task structure */
  73         __u32                   cpu;            /* cpu */
  74         struct cpu_context_save cpu_context;    /* cpu context */
  75         __u32                   syscall;        /* syscall number */
  76         __u8                    used_cp[16];    /* thread used copro */
  77 #ifdef CONFIG_UNICORE_FPU_F64
  78         struct fp_state         fpstate __attribute__((aligned(8)));
  79 #endif
  80 };
  81
  82 #define INIT_THREAD_INFO(tsk)                                           \
  83 {                                                                       \
  84         .task           = &tsk,                                         \
  85         .flags          = 0,                                            \
  86         .preempt_count  = INIT_PREEMPT_COUNT,                           \
  87         .addr_limit     = KERNEL_DS,                                    \
  88 }
  89
  90 #define init_thread_info        (init_thread_union.thread_info)
  91 #define init_stack              (init_thread_union.stack)
  92
  93 /*
  94  * how to get the thread information struct from C
  95  */
  96 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  97
  98 static inline struct thread_info *current_thread_info(void)
  99 {
 100         register unsigned long sp asm ("sp");
 101         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
 102 }
 103
 104 #define thread_saved_pc(tsk)    \
 105         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 106 #define thread_saved_sp(tsk)    \
 107         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 108 #define thread_saved_fp(tsk)    \
 109         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 110
 111 #endif
 112
 113 /*
 114  * thread information flags:
 115  *  TIF_SYSCALL_TRACE   - syscall trace active
 116  *  TIF_SIGPENDING      - signal pending
 117  *  TIF_NEED_RESCHED    - rescheduling necessary
 118  *  TIF_NOTIFY_RESUME   - callback before returning to user
 119  */
 120 #define TIF_SIGPENDING          0
 121 #define TIF_NEED_RESCHED        1
 122 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 123 #define TIF_SYSCALL_TRACE       8
 124 #define TIF_MEMDIE              18
 125 #define TIF_RESTORE_SIGMASK     20
 126
 127 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 128 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 129 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 130 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 131
 132 /*
 133  * Change these and you break ASM code in entry-common.S
 134  */
 135 #define _TIF_WORK_MASK \
 136         (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 137
 138 #endif /* __KERNEL__ */
 139 #endif /* __UNICORE_THREAD_INFO_H__ */