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 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