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@@ -0,0 +1,57 @@
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+/*
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+ * SPDX-License-Identifier: BSD-2-Clause
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+ *
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+ * Copyright (c) 2023 Ventana Micro Systems Inc.
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+ */
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+
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+#ifndef __SBI_BYTEORDER_H__
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+#define __SBI_BYTEORDER_H__
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+
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+#include <sbi/sbi_types.h>
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+
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+#define EXTRACT_BYTE(x, n) ((unsigned long long)((uint8_t *)&x)[n])
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+
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+#define BSWAP16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
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+#define BSWAP32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
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+ (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
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+#define BSWAP64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
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+ (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
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+ (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
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+ (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
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+
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+
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+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ /* CPU(little-endian) */
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+#define cpu_to_be16(x) ((uint16_t)BSWAP16(x))
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+#define cpu_to_be32(x) ((uint32_t)BSWAP32(x))
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+#define cpu_to_be64(x) ((uint64_t)BSWAP64(x))
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+
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+#define be16_to_cpu(x) ((uint16_t)BSWAP16(x))
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+#define be32_to_cpu(x) ((uint32_t)BSWAP32(x))
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+#define be64_to_cpu(x) ((uint64_t)BSWAP64(x))
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+
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+#define cpu_to_le16(x) ((uint16_t)(x))
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+#define cpu_to_le32(x) ((uint32_t)(x))
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+#define cpu_to_le64(x) ((uint64_t)(x))
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+
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+#define le16_to_cpu(x) ((uint16_t)(x))
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+#define le32_to_cpu(x) ((uint32_t)(x))
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+#define le64_to_cpu(x) ((uint64_t)(x))
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+#else /* CPU(big-endian) */
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+#define cpu_to_be16(x) ((uint16_t)(x))
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+#define cpu_to_be32(x) ((uint32_t)(x))
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+#define cpu_to_be64(x) ((uint64_t)(x))
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+
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+#define be16_to_cpu(x) ((uint16_t)(x))
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+#define be32_to_cpu(x) ((uint32_t)(x))
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+#define be64_to_cpu(x) ((uint64_t)(x))
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+
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+#define cpu_to_le16(x) ((uint16_t)BSWAP16(x))
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+#define cpu_to_le32(x) ((uint32_t)BSWAP32(x))
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+#define cpu_to_le64(x) ((uint64_t)BSWAP64(x))
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+
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+#define le16_to_cpu(x) ((uint16_t)BSWAP16(x))
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+#define le32_to_cpu(x) ((uint32_t)BSWAP32(x))
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+#define le64_to_cpu(x) ((uint64_t)BSWAP64(x))
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+#endif
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+
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+#endif /* __SBI_BYTEORDER_H__ */
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