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TOMOYO Linux Cross Reference
Linux/arch/hexagon/include/asm/thread_info.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * Thread support for the Hexagon architecture
  4  *
  5  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
  6  */
  7 
  8 #ifndef _ASM_THREAD_INFO_H
  9 #define _ASM_THREAD_INFO_H
 10 
 11 #ifdef __KERNEL__
 12 
 13 #ifndef __ASSEMBLY__
 14 #include <asm/processor.h>
 15 #include <asm/registers.h>
 16 #include <asm/page.h>
 17 #endif
 18 
 19 #define THREAD_SHIFT            12
 20 #define THREAD_SIZE             (1<<THREAD_SHIFT)
 21 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
 22 
 23 #ifndef __ASSEMBLY__
 24 
 25 typedef struct {
 26         unsigned long seg;
 27 } mm_segment_t;
 28 
 29 /*
 30  * This is union'd with the "bottom" of the kernel stack.
 31  * It keeps track of thread info which is handy for routines
 32  * to access quickly.
 33  */
 34 
 35 struct thread_info {
 36         struct task_struct      *task;          /* main task structure */
 37         unsigned long           flags;          /* low level flags */
 38         __u32                   cpu;            /* current cpu */
 39         int                     preempt_count;  /* 0=>preemptible,<0=>BUG */
 40         mm_segment_t            addr_limit;     /* segmentation sux */
 41         /*
 42          * used for syscalls somehow;
 43          * seems to have a function pointer and four arguments
 44          */
 45         /* Points to the current pt_regs frame  */
 46         struct pt_regs          *regs;
 47         /*
 48          * saved kernel sp at switch_to time;
 49          * not sure if this is used (it's not in the VM model it seems;
 50          * see thread_struct)
 51          */
 52         unsigned long           sp;
 53 };
 54 
 55 #else /* !__ASSEMBLY__ */
 56 
 57 #include <asm/asm-offsets.h>
 58 
 59 #endif  /* __ASSEMBLY__  */
 60 
 61 #ifndef __ASSEMBLY__
 62 
 63 #define INIT_THREAD_INFO(tsk)                   \
 64 {                                               \
 65         .task           = &tsk,                 \
 66         .flags          = 0,                    \
 67         .cpu            = 0,                    \
 68         .preempt_count  = 1,                    \
 69         .addr_limit     = KERNEL_DS,            \
 70         .sp = 0,                                \
 71         .regs = NULL,                   \
 72 }
 73 
 74 /* Tacky preprocessor trickery */
 75 #define qqstr(s) qstr(s)
 76 #define qstr(s) #s
 77 #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
 78 
 79 register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 80 #define current_thread_info()  __current_thread_info
 81 
 82 #endif /* __ASSEMBLY__ */
 83 
 84 /*
 85  * thread information flags
 86  * - these are process state flags that various assembly files
 87  *   may need to access
 88  * - pending work-to-be-done flags are in LSW
 89  * - other flags in MSW
 90  */
 91 
 92 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 93 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 94 #define TIF_SIGPENDING          2       /* signal pending */
 95 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 96 #define TIF_SINGLESTEP          4       /* restore ss @ return to usr mode */
 97 #define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
 98 /* true if poll_idle() is polling TIF_NEED_RESCHED */
 99 #define TIF_MEMDIE              17      /* OOM killer killed process */
100 
101 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
102 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
103 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
104 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
105 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
106 
107 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
108 #define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
109 
110 /* work to do on any return to u-space */
111 #define _TIF_ALLWORK_MASK       0x0000FFFF
112 
113 #endif /* __KERNEL__ */
114 
115 #endif
116 

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