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Linux/arch/unicore32/include/asm/thread_info.h

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  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 /*
 91  * how to get the thread information struct from C
 92  */
 93 static inline struct thread_info *current_thread_info(void) __attribute_const__;
 94 
 95 static inline struct thread_info *current_thread_info(void)
 96 {
 97         register unsigned long sp asm ("sp");
 98         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
 99 }
100 
101 #define thread_saved_pc(tsk)    \
102         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
103 #define thread_saved_sp(tsk)    \
104         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
105 #define thread_saved_fp(tsk)    \
106         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
107 
108 #endif
109 
110 /*
111  * thread information flags:
112  *  TIF_SYSCALL_TRACE   - syscall trace active
113  *  TIF_SIGPENDING      - signal pending
114  *  TIF_NEED_RESCHED    - rescheduling necessary
115  *  TIF_NOTIFY_RESUME   - callback before returning to user
116  */
117 #define TIF_SIGPENDING          0
118 #define TIF_NEED_RESCHED        1
119 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
120 #define TIF_SYSCALL_TRACE       8
121 #define TIF_MEMDIE              18
122 #define TIF_RESTORE_SIGMASK     20
123 
124 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
125 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
126 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
127 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
128 
129 /*
130  * Change these and you break ASM code in entry-common.S
131  */
132 #define _TIF_WORK_MASK \
133         (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
134 
135 #endif /* __KERNEL__ */
136 #endif /* __UNICORE_THREAD_INFO_H__ */
137 

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