arch/loongarch/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * thread_info.h: LoongArch low-level thread information
   4  *
   5  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   6  */
   7
   8 #ifndef _ASM_THREAD_INFO_H
   9 #define _ASM_THREAD_INFO_H
  10
  11 #ifdef __KERNEL__
  12
  13 #ifndef __ASSEMBLY__
  14
  15 #include <asm/processor.h>
  16
  17 /*
  18  * low level task data that entry.S needs immediate access to
  19  * - this struct should fit entirely inside of one cache line
  20  * - this struct shares the supervisor stack pages
  21  * - if the contents of this structure are changed, the assembly constants
  22  *   must also be changed
  23  */
  24 struct thread_info {
  25         struct task_struct      *task;          /* main task structure */
  26         unsigned long           flags;          /* low level flags */
  27         unsigned long           tp_value;       /* thread pointer */
  28         __u32                   cpu;            /* current CPU */
  29         int                     preempt_count;  /* 0 => preemptible, <0 => BUG */
  30         struct pt_regs          *regs;
  31         unsigned long           syscall;        /* syscall number */
  32         unsigned long           syscall_work;   /* SYSCALL_WORK_ flags */
  33 };
  34
  35 /*
  36  * macros/functions for gaining access to the thread information structure
  37  */
  38 #define INIT_THREAD_INFO(tsk)                   \
  39 {                                               \
  40         .task           = &tsk,                 \
  41         .flags          = _TIF_FIXADE,          \
  42         .cpu            = 0,                    \
  43         .preempt_count  = INIT_PREEMPT_COUNT,   \
  44 }
  45
  46 /* How to get the thread information struct from C. */
  47 register struct thread_info *__current_thread_info __asm__("$tp");
  48
  49 static inline struct thread_info *current_thread_info(void)
  50 {
  51         return __current_thread_info;
  52 }
  53
  54 register unsigned long current_stack_pointer __asm__("$sp");
  55
  56 #endif /* !__ASSEMBLY__ */
  57
  58 /* thread information allocation */
  59 #define THREAD_SIZE             SZ_16K
  60 #define THREAD_MASK             (THREAD_SIZE - 1UL)
  61 #define THREAD_SIZE_ORDER       ilog2(THREAD_SIZE / PAGE_SIZE)
  62 /*
  63  * thread information flags
  64  * - these are process state flags that various assembly files may need to
  65  *   access
  66  * - pending work-to-be-done flags are in LSW
  67  * - other flags in MSW
  68  */
  69 #define TIF_NEED_RESCHED        0       /* rescheduling necessary */
  70 #define TIF_NEED_RESCHED_LAZY   1       /* lazy rescheduling necessary */
  71 #define TIF_SIGPENDING          2       /* signal pending */
  72 #define TIF_NOTIFY_RESUME       3       /* callback before returning to user */
  73 #define TIF_NOTIFY_SIGNAL       4       /* signal notifications exist */
  74 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  75 #define TIF_NOHZ                6       /* in adaptive nohz mode */
  76 #define TIF_UPROBE              7       /* breakpointed or singlestepping */
  77 #define TIF_USEDFPU             8       /* FPU was used by this task this quantum (SMP) */
  78 #define TIF_USEDSIMD            9       /* SIMD has been used this quantum */
  79 #define TIF_MEMDIE              10      /* is terminating due to OOM killer */
  80 #define TIF_FIXADE              11      /* Fix address errors in software */
  81 #define TIF_LOGADE              12      /* Log address errors to syslog */
  82 #define TIF_32BIT_REGS          13      /* 32-bit general purpose registers */
  83 #define TIF_32BIT_ADDR          14      /* 32-bit address space */
  84 #define TIF_LOAD_WATCH          15      /* If set, load watch registers */
  85 #define TIF_SINGLESTEP          16      /* Single Step */
  86 #define TIF_LSX_CTX_LIVE        17      /* LSX context must be preserved */
  87 #define TIF_LASX_CTX_LIVE       18      /* LASX context must be preserved */
  88 #define TIF_USEDLBT             19      /* LBT was used by this task this quantum (SMP) */
  89 #define TIF_LBT_CTX_LIVE        20      /* LBT context must be preserved */
  90 #define TIF_PATCH_PENDING       21      /* pending live patching update */
  91
  92 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  93 #define _TIF_NEED_RESCHED_LAZY  (1<<TIF_NEED_RESCHED_LAZY)
  94 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  95 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  96 #define _TIF_NOTIFY_SIGNAL      (1<<TIF_NOTIFY_SIGNAL)
  97 #define _TIF_NOHZ               (1<<TIF_NOHZ)
  98 #define _TIF_UPROBE             (1<<TIF_UPROBE)
  99 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 100 #define _TIF_USEDSIMD           (1<<TIF_USEDSIMD)
 101 #define _TIF_FIXADE             (1<<TIF_FIXADE)
 102 #define _TIF_LOGADE             (1<<TIF_LOGADE)
 103 #define _TIF_32BIT_REGS         (1<<TIF_32BIT_REGS)
 104 #define _TIF_32BIT_ADDR         (1<<TIF_32BIT_ADDR)
 105 #define _TIF_LOAD_WATCH         (1<<TIF_LOAD_WATCH)
 106 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 107 #define _TIF_LSX_CTX_LIVE       (1<<TIF_LSX_CTX_LIVE)
 108 #define _TIF_LASX_CTX_LIVE      (1<<TIF_LASX_CTX_LIVE)
 109 #define _TIF_USEDLBT            (1<<TIF_USEDLBT)
 110 #define _TIF_LBT_CTX_LIVE       (1<<TIF_LBT_CTX_LIVE)
 111 #define _TIF_PATCH_PENDING      (1<<TIF_PATCH_PENDING)
 112
 113 #endif /* __KERNEL__ */
 114 #endif /* _ASM_THREAD_INFO_H */