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author | Peter Tyser <ptyser@xes-inc.com> | 2010-04-13 03:28:08 (GMT) |
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committer | Wolfgang Denk <wd@denx.de> | 2010-04-13 07:13:12 (GMT) |
commit | 819833af39a91fa1c1e8252862bbda6f5a602f7b (patch) | |
tree | d5c9d1628643347ab2b5a8085acfa6f96709fda3 /arch/arm/include/asm/arch-pxa/bitfield.h | |
parent | 61f2b38a17f5b21c59f2afe6cf1cbb5f28638cf9 (diff) | |
download | u-boot-819833af39a91fa1c1e8252862bbda6f5a602f7b.tar.xz |
Move architecture-specific includes to arch/$ARCH/include/asm
This helps to clean up the include/ directory so that it only contains
non-architecture-specific headers and also matches Linux's directory
layout which many U-Boot developers are already familiar with.
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Diffstat (limited to 'arch/arm/include/asm/arch-pxa/bitfield.h')
-rw-r--r-- | arch/arm/include/asm/arch-pxa/bitfield.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-pxa/bitfield.h b/arch/arm/include/asm/arch-pxa/bitfield.h new file mode 100644 index 0000000..104a21c --- /dev/null +++ b/arch/arm/include/asm/arch-pxa/bitfield.h @@ -0,0 +1,112 @@ +/* + * 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 */ |