LXR linux/arch/c6x/include/asm/thread

   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
  31typedef struct {
  32        unsigned long seg;
  33} mm_segment_t;
  34
  35/*
  36 * low level task data.
  37 */
  38struct 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 */
  61static inline __attribute__((const))
  62struct 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
  86#define TIF_MEMDIE              17      /* OOM killer killed process */
  87
  88#define TIF_WORK_MASK           0x00007FFE /* work on irq/exception return */
  89#define TIF_ALLWORK_MASK        0x00007FFF /* work on any return to u-space */
  90
  91#endif /* __KERNEL__ */
  92
  93#endif /* _ASM_C6X_THREAD_INFO_H */
  94