arch/hexagon/include/asm/thread_info.h

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