xref: /kernel/linux/linux-6.6/scripts/dtc/libfdt/libfdt_env.h (revision 62306a36)

/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
#ifndef LIBFDT_ENV_H
#define LIBFDT_ENV_H
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 * Copyright 2012 Kim Phillips, Freescale Semiconductor.
 */

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#ifdef __CHECKER__
#define FDT_FORCE __attribute__((force))
#define FDT_BITWISE __attribute__((bitwise))
#else
#define FDT_FORCE
#define FDT_BITWISE
#endif

typedef uint16_t FDT_BITWISE fdt16_t;
typedef uint32_t FDT_BITWISE fdt32_t;
typedef uint64_t FDT_BITWISE fdt64_t;

#define EXTRACT_BYTE(x, n)	((unsigned long long)((uint8_t *)&x)[n])
#define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
#define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
			 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
#define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
			 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
			 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
			 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))

static inline uint16_t fdt16_to_cpu(fdt16_t x)
{
	return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
}
static inline fdt16_t cpu_to_fdt16(uint16_t x)
{
	return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
}

static inline uint32_t fdt32_to_cpu(fdt32_t x)
{
	return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
}
static inline fdt32_t cpu_to_fdt32(uint32_t x)
{
	return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
}

static inline uint64_t fdt64_to_cpu(fdt64_t x)
{
	return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
}
static inline fdt64_t cpu_to_fdt64(uint64_t x)
{
	return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
}
#undef CPU_TO_FDT64
#undef CPU_TO_FDT32
#undef CPU_TO_FDT16
#undef EXTRACT_BYTE

#ifdef __APPLE__
#include <AvailabilityMacros.h>

/* strnlen() is not available on Mac OS < 10.7 */
# if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
                                         MAC_OS_X_VERSION_10_7)

#define strnlen fdt_strnlen

/*
 * fdt_strnlen: returns the length of a string or max_count - which ever is
 * smallest.
 * Input 1 string: the string whose size is to be determined
 * Input 2 max_count: the maximum value returned by this function
 * Output: length of the string or max_count (the smallest of the two)
 */
static inline size_t fdt_strnlen(const char *string, size_t max_count)
{
    const char *p = memchr(string, 0, max_count);
    return p ? p - string : max_count;
}

#endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
          MAC_OS_X_VERSION_10_7) */

#endif /* __APPLE__ */

#endif /* LIBFDT_ENV_H */