76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_BITS_H
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#define __LINUX_BITS_H
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#include <linux/const.h>
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#include <vdso/bits.h>
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#include <asm/bitsperlong.h>
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#define BIT_ULL(nr) (ULL(1) << (nr))
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#define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG))
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#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
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#define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG))
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#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
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#define BITS_PER_BYTE 8
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/*
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* Create a contiguous bitmask starting at bit position @l and ending at
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* position @h. For example
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* GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
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*/
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#if !defined(__ASSEMBLY__)
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#include <linux/build_bug.h>
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#define GENMASK_INPUT_CHECK(h, l) \
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(BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
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__is_constexpr((l) > (h)), (l) > (h), 0)))
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#else
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/*
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* BUILD_BUG_ON_ZERO is not available in h files included from asm files,
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* disable the input check if that is the case.
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*/
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#define GENMASK_INPUT_CHECK(h, l) 0
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#endif
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#define __GENMASK(h, l) \
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(((~UL(0)) - (UL(1) << (l)) + 1) & \
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(~UL(0) >> (BITS_PER_LONG - 1 - (h))))
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#define GENMASK(h, l) \
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(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
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#define __GENMASK_ULL(h, l) \
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(((~ULL(0)) - (ULL(1) << (l)) + 1) & \
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(~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
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#define GENMASK_ULL(h, l) \
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(GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l))
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/* Some common bit operation of a (long type) register */
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#define writel_clrbits(mask, addr) writel(readl(addr) & ~(mask), addr)
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#define writel_clrbit(bit, addr) writel_clrbits(bit, addr)
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#define writel_bits(val, mask, shift, addr) \
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({ \
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if (val) \
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writel((readl(addr) & ~(mask)) | ((val) << (shift)), \
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addr); \
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else \
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writel_clrbits(mask, addr); \
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})
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#define writel_bit(bit, addr) writel(readl(addr) | bit, addr)
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#define readl_bits(mask, shift, addr) ((readl(addr) & (mask)) >> (shift))
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#define readl_bit(bit, addr) ((readl(addr) & bit) ? 1 : 0)
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/* Some common bit operation of a variable */
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#define clrbits(mask, cur) ((cur) &= ~(mask))
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#define clrbit(bit, cur) clrbits(bit, cur)
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#define setbits(val, mask, shift, cur) \
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({ \
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if (val) \
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(cur = (cur & ~(mask)) | ((val) << (shift))); \
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else \
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clrbits(mask, cur); \
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})
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#define setbit(bit, cur) ((cur) |= bit)
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#define getbits(mask, shift, cur) (((cur) & (mask)) >> (shift))
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#define getbit(bit, cur) ((cur) & (bit) ? 1 : 0)
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#endif /* __LINUX_BITS_H */
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