Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / metag / include / asm / hwthread.h

diff --git a/kernel/arch/metag/include/asm/hwthread.h b/kernel/arch/metag/include/asm/hwthread.h
new file mode 100644 (file)
index 0000000..8f97866
--- /dev/null
+++ b/kernel/arch/metag/include/asm/hwthread.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2008 Imagination Technologies
+ */
+#ifndef __METAG_HWTHREAD_H
+#define __METAG_HWTHREAD_H
+
+#include <linux/bug.h>
+#include <linux/io.h>
+
+#include <asm/metag_mem.h>
+
+#define BAD_HWTHREAD_ID                (0xFFU)
+#define BAD_CPU_ID             (0xFFU)
+
+extern u8 cpu_2_hwthread_id[];
+extern u8 hwthread_id_2_cpu[];
+
+/*
+ * Each hardware thread's Control Unit registers are memory-mapped
+ * and can therefore be accessed by any other hardware thread.
+ *
+ * This helper function returns the memory address where "thread"'s
+ * register "regnum" is mapped.
+ */
+static inline
+void __iomem *__CU_addr(unsigned int thread, unsigned int regnum)
+{
+       unsigned int base, thread_offset, thread_regnum;
+
+       WARN_ON(thread == BAD_HWTHREAD_ID);
+
+       base = T0UCTREG0;       /* Control unit base */
+
+       thread_offset = TnUCTRX_STRIDE * thread;
+       thread_regnum = TXUCTREGn_STRIDE * regnum;
+
+       return (void __iomem *)(base + thread_offset + thread_regnum);
+}
+
+#endif /* __METAG_HWTHREAD_H */