arch/c6x/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  Port on Texas Instruments TMS320C6x architecture
   4  *
   5  *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   6  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   7  *
   8  *  Updated for 2.6.3x: Mark Salter <msalter@redhat.com>
   9  */
  10 #ifndef _ASM_C6X_THREAD_INFO_H
  11 #define _ASM_C6X_THREAD_INFO_H
  12
  13 #ifdef __KERNEL__
  14
  15 #include <asm/page.h>
  16
  17 #ifdef CONFIG_4KSTACKS
  18 #define THREAD_SIZE             4096
  19 #define THREAD_SHIFT            12
  20 #define THREAD_SIZE_ORDER       0
  21 #else
  22 #define THREAD_SIZE             8192
  23 #define THREAD_SHIFT            13
  24 #define THREAD_SIZE_ORDER       1
  25 #endif
  26
  27 #define THREAD_START_SP         (THREAD_SIZE - 8)
  28
  29 #ifndef __ASSEMBLY__
  30
  31 typedef struct {
  32         unsigned long seg;
  33 } mm_segment_t;
  34
  35 /*
  36  * low level task data.
  37  */
  38 struct thread_info {
  39         struct task_struct      *task;          /* main task structure */
  40         unsigned long           flags;          /* low level flags */
  41         int                     cpu;            /* cpu we're on */
  42         int                     preempt_count;  /* 0 = preemptable, <0 = BUG */
  43         mm_segment_t            addr_limit;     /* thread address space */
  44 };
  45
  46 /*
  47  * macros/functions for gaining access to the thread information structure
  48  *
  49  * preempt_count needs to be 1 initially, until the scheduler is functional.
  50  */
  51 #define INIT_THREAD_INFO(tsk)                   \
  52 {                                               \
  53         .task           = &tsk,                 \
  54         .flags          = 0,                    \
  55         .cpu            = 0,                    \
  56         .preempt_count  = INIT_PREEMPT_COUNT,   \
  57         .addr_limit     = KERNEL_DS,            \
  58 }
  59
  60 /* get the thread information struct of current task */
  61 static inline __attribute__((const))
  62 struct thread_info *current_thread_info(void)
  63 {
  64         struct thread_info *ti;
  65         asm volatile (" clr   .s2 B15,0,%1,%0\n"
  66                       : "=b" (ti)
  67                       : "Iu5" (THREAD_SHIFT - 1));
  68         return ti;
  69 }
  70
  71 #define get_thread_info(ti)     get_task_struct((ti)->task)
  72 #define put_thread_info(ti)     put_task_struct((ti)->task)
  73 #endif /* __ASSEMBLY__ */
  74
  75 /*
  76  * thread information flag bit numbers
  77  * - pending work-to-be-done flags are in LSW
  78  * - other flags in MSW
  79  */
  80 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  81 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  82 #define TIF_SIGPENDING          2       /* signal pending */
  83 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  84 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
  85 #define TIF_NOTIFY_SIGNAL       5       /* signal notifications exist */
  86
  87 #define TIF_MEMDIE              17      /* OOM killer killed process */
  88
  89 #define TIF_WORK_MASK           0x00007FFE /* work on irq/exception return */
  90 #define TIF_ALLWORK_MASK        0x00007FFF /* work on any return to u-space */
  91
  92 #endif /* __KERNEL__ */
  93
  94 #endif /* _ASM_C6X_THREAD_INFO_H */