LXR linux/arch/metag/include/asm/hwthread.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (C) 2008 Imagination Technologies
   4 */
   5#ifndef __METAG_HWTHREAD_H
   6#define __METAG_HWTHREAD_H
   7
   8#include <linux/bug.h>
   9#include <linux/io.h>
  10
  11#include <asm/metag_mem.h>
  12
  13#define BAD_HWTHREAD_ID         (0xFFU)
  14#define BAD_CPU_ID              (0xFFU)
  15
  16extern u8 cpu_2_hwthread_id[];
  17extern u8 hwthread_id_2_cpu[];
  18
  19/*
  20 * Each hardware thread's Control Unit registers are memory-mapped
  21 * and can therefore be accessed by any other hardware thread.
  22 *
  23 * This helper function returns the memory address where "thread"'s
  24 * register "regnum" is mapped.
  25 */
  26static inline
  27void __iomem *__CU_addr(unsigned int thread, unsigned int regnum)
  28{
  29        unsigned int base, thread_offset, thread_regnum;
  30
  31        WARN_ON(thread == BAD_HWTHREAD_ID);
  32
  33        base = T0UCTREG0;       /* Control unit base */
  34
  35        thread_offset = TnUCTRX_STRIDE * thread;
  36        thread_regnum = TXUCTREGn_STRIDE * regnum;
  37
  38        return (void __iomem *)(base + thread_offset + thread_regnum);
  39}
  40
  41#endif /* __METAG_HWTHREAD_H */
  42