arch/score/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_SCORE_THREAD_INFO_H
   3 #define _ASM_SCORE_THREAD_INFO_H
   4
   5 #ifdef __KERNEL__
   6
   7 #define KU_MASK 0x08
   8 #define KU_USER 0x08
   9 #define KU_KERN 0x00
  10
  11 #include <asm/page.h>
  12 #include <linux/const.h>
  13
  14 /* thread information allocation */
  15 #define THREAD_SIZE_ORDER       (1)
  16 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  17 #define THREAD_MASK             (THREAD_SIZE - _AC(1,UL))
  18
  19 #ifndef __ASSEMBLY__
  20
  21 #include <asm/processor.h>
  22
  23 /*
  24  * low level task data that entry.S needs immediate access to
  25  * - this struct should fit entirely inside of one cache line
  26  * - this struct shares the supervisor stack pages
  27  * - if the contents of this structure are changed, the assembly constants
  28  *   must also be changed
  29  */
  30 struct thread_info {
  31         struct task_struct      *task;          /* main task structure */
  32         unsigned long           flags;          /* low level flags */
  33         unsigned long           tp_value;       /* thread pointer */
  34         __u32                   cpu;            /* current CPU */
  35
  36         /* 0 => preemptable, < 0 => BUG */
  37         int                     preempt_count;
  38
  39         /*
  40          * thread address space:
  41          * 0-0xBFFFFFFF for user-thead
  42          * 0-0xFFFFFFFF for kernel-thread
  43          */
  44         mm_segment_t            addr_limit;
  45         struct pt_regs          *regs;
  46 };
  47
  48 /*
  49  * macros/functions for gaining access to the thread information structure
  50  *
  51  * preempt_count needs to be 1 initially, until the scheduler is functional.
  52  */
  53 #define INIT_THREAD_INFO(tsk)                   \
  54 {                                               \
  55         .task           = &tsk,                 \
  56         .cpu            = 0,                    \
  57         .preempt_count  = 1,                    \
  58         .addr_limit     = KERNEL_DS,            \
  59 }
  60
  61 #define init_thread_info        (init_thread_union.thread_info)
  62 #define init_stack              (init_thread_union.stack)
  63
  64 /* How to get the thread information struct from C. */
  65 register struct thread_info *__current_thread_info __asm__("r28");
  66 #define current_thread_info()   __current_thread_info
  67
  68 #endif /* !__ASSEMBLY__ */
  69
  70 /*
  71  * thread information flags
  72  * - these are process state flags that various assembly files may need to
  73  *   access
  74  * - pending work-to-be-done flags are in LSW
  75  * - other flags in MSW
  76  */
  77 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  78 #define TIF_SIGPENDING          1       /* signal pending */
  79 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  80 #define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  81 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  82 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
  83
  84 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  85 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  86 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  87 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  88
  89 #define _TIF_WORK_MASK          (0x0000ffff)
  90
  91 #endif /* __KERNEL__ */
  92
  93 #endif /* _ASM_SCORE_THREAD_INFO_H */