scripts/dtc/libfdt/libfdt_env.h

Source file repositories/reference/linux-study-clean/scripts/dtc/libfdt/libfdt_env.h

File Facts

System
Linux kernel
Corpus path
scripts/dtc/libfdt/libfdt_env.h
Extension
.h
Size
1888 bytes
Lines
70
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#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

#endif /* LIBFDT_ENV_H */

Annotation

Implementation Notes