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
  16 extern u8 cpu_2_hwthread_id[];
  17 extern 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  */
  26 static inline
  27 void __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 */