Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / include / asm / arch-sa1100 / bitfield.h

diff --git a/qemu/roms/u-boot/arch/arm/include/asm/arch-sa1100/bitfield.h b/qemu/roms/u-boot/arch/arm/include/asm/arch-sa1100/bitfield.h
new file mode 100644 (file)
index 0000000..104a21c
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/include/asm/arch-sa1100/bitfield.h
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+/*
+ *     FILE            bitfield.h
+ *
+ *     Version         1.1
+ *     Author          Copyright (c) Marc A. Viredaz, 1998
+ *                     DEC Western Research Laboratory, Palo Alto, CA
+ *     Date            April 1998 (April 1997)
+ *     System          Advanced RISC Machine (ARM)
+ *     Language        C or ARM Assembly
+ *     Purpose         Definition of macros to operate on bit fields.
+ */
+
+
+#ifndef __BITFIELD_H
+#define __BITFIELD_H
+
+#ifndef __ASSEMBLY__
+#define UData(Data)    ((unsigned long) (Data))
+#else
+#define UData(Data)    (Data)
+#endif
+
+
+/*
+ * MACRO: Fld
+ *
+ * Purpose
+ *    The macro "Fld" encodes a bit field, given its size and its shift value
+ *    with respect to bit 0.
+ *
+ * Note
+ *    A more intuitive way to encode bit fields would have been to use their
+ *    mask. However, extracting size and shift value information from a bit
+ *    field's mask is cumbersome and might break the assembler (255-character
+ *    line-size limit).
+ *
+ * Input
+ *    Size             Size of the bit field, in number of bits.
+ *    Shft             Shift value of the bit field with respect to bit 0.
+ *
+ * Output
+ *    Fld              Encoded bit field.
+ */
+
+#define Fld(Size, Shft)        (((Size) << 16) + (Shft))
+
+
+/*
+ * MACROS: FSize, FShft, FMsk, FAlnMsk, F1stBit
+ *
+ * Purpose
+ *    The macros "FSize", "FShft", "FMsk", "FAlnMsk", and "F1stBit" return
+ *    the size, shift value, mask, aligned mask, and first bit of a
+ *    bit field.
+ *
+ * Input
+ *    Field            Encoded bit field (using the macro "Fld").
+ *
+ * Output
+ *    FSize            Size of the bit field, in number of bits.
+ *    FShft            Shift value of the bit field with respect to bit 0.
+ *    FMsk             Mask for the bit field.
+ *    FAlnMsk          Mask for the bit field, aligned on bit 0.
+ *    F1stBit          First bit of the bit field.
+ */
+
+#define FSize(Field)   ((Field) >> 16)
+#define FShft(Field)   ((Field) & 0x0000FFFF)
+#define FMsk(Field)    (((UData (1) << FSize (Field)) - 1) << FShft (Field))
+#define FAlnMsk(Field) ((UData (1) << FSize (Field)) - 1)
+#define F1stBit(Field) (UData (1) << FShft (Field))
+
+
+/*
+ * MACRO: FInsrt
+ *
+ * Purpose
+ *    The macro "FInsrt" inserts a value into a bit field by shifting the
+ *    former appropriately.
+ *
+ * Input
+ *    Value            Bit-field value.
+ *    Field            Encoded bit field (using the macro "Fld").
+ *
+ * Output
+ *    FInsrt           Bit-field value positioned appropriately.
+ */
+
+#define FInsrt(Value, Field) \
+                       (UData (Value) << FShft (Field))
+
+
+/*
+ * MACRO: FExtr
+ *
+ * Purpose
+ *    The macro "FExtr" extracts the value of a bit field by masking and
+ *    shifting it appropriately.
+ *
+ * Input
+ *    Data             Data containing the bit-field to be extracted.
+ *    Field            Encoded bit field (using the macro "Fld").
+ *
+ * Output
+ *    FExtr            Bit-field value.
+ */
+
+#define FExtr(Data, Field) \
+                       ((UData (Data) >> FShft (Field)) & FAlnMsk (Field))
+
+
+#endif /* __BITFIELD_H */