arch/riscv/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
   4  * Copyright (C) 2012 Regents of the University of California
   5  * Copyright (C) 2017 SiFive
   6  */
   7
   8 #ifndef _ASM_RISCV_THREAD_INFO_H
   9 #define _ASM_RISCV_THREAD_INFO_H
  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
  18 #ifndef __ASSEMBLY__
  19
  20 #include <asm/processor.h>
  21 #include <asm/csr.h>
  22
  23 typedef struct {
  24         unsigned long seg;
  25 } mm_segment_t;
  26
  27 /*
  28  * low level task data that entry.S needs immediate access to
  29  * - this struct should fit entirely inside of one cache line
  30  * - if the members of this struct changes, the assembly constants
  31  *   in asm-offsets.c must be updated accordingly
  32  * - thread_info is included in task_struct at an offset of 0.  This means that
  33  *   tp points to both thread_info and task_struct.
  34  */
  35 struct thread_info {
  36         unsigned long           flags;          /* low level flags */
  37         int                     preempt_count;  /* 0=>preemptible, <0=>BUG */
  38         mm_segment_t            addr_limit;
  39         /*
  40          * These stack pointers are overwritten on every system call or
  41          * exception.  SP is also saved to the stack it can be recovered when
  42          * overwritten.
  43          */
  44         long                    kernel_sp;      /* Kernel stack pointer */
  45         long                    user_sp;        /* User stack pointer */
  46         int                     cpu;
  47 };
  48
  49 /*
  50  * macros/functions for gaining access to the thread information structure
  51  *
  52  * preempt_count needs to be 1 initially, until the scheduler is functional.
  53  */
  54 #define INIT_THREAD_INFO(tsk)                   \
  55 {                                               \
  56         .flags          = 0,                    \
  57         .preempt_count  = INIT_PREEMPT_COUNT,   \
  58         .addr_limit     = KERNEL_DS,            \
  59 }
  60
  61 #endif /* !__ASSEMBLY__ */
  62
  63 /*
  64  * thread information flags
  65  * - these are process state flags that various assembly files may need to
  66  *   access
  67  * - pending work-to-be-done flags are in lowest half-word
  68  * - other flags in upper half-word(s)
  69  */
  70 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  71 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  72 #define TIF_SIGPENDING          2       /* signal pending */
  73 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  74 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
  75 #define TIF_MEMDIE              5       /* is terminating due to OOM killer */
  76 #define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
  77 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing */
  78 #define TIF_SECCOMP             8       /* syscall secure computing */
  79
  80 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  81 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  82 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  83 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  84 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
  85 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  86 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
  87
  88 #define _TIF_WORK_MASK \
  89         (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED)
  90
  91 #define _TIF_SYSCALL_WORK \
  92         (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \
  93          _TIF_SECCOMP)
  94
  95 #endif /* _ASM_RISCV_THREAD_INFO_H */