LXR linux/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
  15extern u8 cpu_2_hwthread_id[];
  16extern 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 */
  25static inline
  26void __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 */
  41