arch/metag/include/asm/hwthread.h

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