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49 lines
1.8 KiB
49 lines
1.8 KiB
/* SPDX-License-Identifier: BSD-3-Clause |
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* Copyright (c) 2016-2018, NXP Semiconductors |
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* Copyright (c) 2018-2019, Vladimir Oltean <[email protected]> |
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*/ |
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#ifndef _LINUX_PACKING_H |
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#define _LINUX_PACKING_H |
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#include <linux/types.h> |
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#include <linux/bitops.h> |
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#define QUIRK_MSB_ON_THE_RIGHT BIT(0) |
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#define QUIRK_LITTLE_ENDIAN BIT(1) |
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#define QUIRK_LSW32_IS_FIRST BIT(2) |
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enum packing_op { |
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PACK, |
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UNPACK, |
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}; |
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/** |
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* packing - Convert numbers (currently u64) between a packed and an unpacked |
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* format. Unpacked means laid out in memory in the CPU's native |
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* understanding of integers, while packed means anything else that |
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* requires translation. |
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* |
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* @pbuf: Pointer to a buffer holding the packed value. |
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* @uval: Pointer to an u64 holding the unpacked value. |
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* @startbit: The index (in logical notation, compensated for quirks) where |
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* the packed value starts within pbuf. Must be larger than, or |
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* equal to, endbit. |
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* @endbit: The index (in logical notation, compensated for quirks) where |
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* the packed value ends within pbuf. Must be smaller than, or equal |
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* to, startbit. |
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* @op: If PACK, then uval will be treated as const pointer and copied (packed) |
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* into pbuf, between startbit and endbit. |
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* If UNPACK, then pbuf will be treated as const pointer and the logical |
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* value between startbit and endbit will be copied (unpacked) to uval. |
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* @quirks: A bit mask of QUIRK_LITTLE_ENDIAN, QUIRK_LSW32_IS_FIRST and |
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* QUIRK_MSB_ON_THE_RIGHT. |
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* |
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* Return: 0 on success, EINVAL or ERANGE if called incorrectly. Assuming |
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* correct usage, return code may be discarded. |
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* If op is PACK, pbuf is modified. |
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* If op is UNPACK, uval is modified. |
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*/ |
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int packing(void *pbuf, u64 *uval, int startbit, int endbit, size_t pbuflen, |
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enum packing_op op, u8 quirks); |
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#endif
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