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Diffstat (limited to 'roms/skiboot/include/bitutils.h')
| -rw-r--r-- | roms/skiboot/include/bitutils.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/roms/skiboot/include/bitutils.h b/roms/skiboot/include/bitutils.h new file mode 100644 index 000000000..ac3af4d1c --- /dev/null +++ b/roms/skiboot/include/bitutils.h @@ -0,0 +1,42 @@ +// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later +/* Copyright 2013-2016 IBM Corp. */ + +#ifndef __BITUTILS_H +#define __BITUTILS_H + +/* PPC bit number conversion */ +#ifdef __ASSEMBLY__ +#define PPC_BIT(bit) (0x8000000000000000 >> (bit)) +#define PPC_BIT32(bit) (0x80000000 >> (bit)) +#define PPC_BIT16(bit) (0x8000 >> (bit)) +#define PPC_BIT8(bit) (0x80 >> (bit)) +#else +#define PPC_BIT(bit) (0x8000000000000000UL >> (bit)) +#define PPC_BIT32(bit) (0x80000000UL >> (bit)) +#define PPC_BIT16(bit) (0x8000UL >> (bit)) +#define PPC_BIT8(bit) (0x80UL >> (bit)) +#endif +#define PPC_BITMASK(bs,be) ((PPC_BIT(bs) - PPC_BIT(be)) | PPC_BIT(bs)) +#define PPC_BITMASK32(bs,be) ((PPC_BIT32(bs) - PPC_BIT32(be))|PPC_BIT32(bs)) +#define PPC_BITMASK16(bs,be) ((PPC_BIT16(bs) - PPC_BIT16(be))|PPC_BIT16(bs)) +#define PPC_BITMASK8(bs,be) ((PPC_BIT8(bs) - PPC_BIT8(be))|PPC_BIT8(bs)) +#define PPC_BITLSHIFT(be) (63 - (be)) +#define PPC_BITLSHIFT32(be) (31 - (be)) + +/* + * PPC bitmask field manipulation + */ + +/* Find left shift from first set bit in mask */ +#define MASK_TO_LSH(m) (__builtin_ffsl(m) - 1) + +/* Extract field from 'v' according to mask 'm' */ +#define GETFIELD(m, v) (((v) & (m)) >> MASK_TO_LSH(m)) + +/* Set field specified by mask 'm' of 'v' to value 'val' + * NOTE: 'v' isn't modified, the combined result is returned + */ +#define SETFIELD(m, v, val) \ + (((v) & ~(m)) | ((((typeof(v))(val)) << MASK_TO_LSH(m)) & (m))) + +#endif /* __BITUTILS_H */ |