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      1 /*	$NetBSD: libfdt_env.h,v 1.5 2019/12/22 12:33:17 skrll Exp $	*/
      2 
      3 /* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
      4 #ifndef LIBFDT_ENV_H
      5 #define LIBFDT_ENV_H
      6 /*
      7  * libfdt - Flat Device Tree manipulation
      8  * Copyright (C) 2006 David Gibson, IBM Corporation.
      9  * Copyright 2012 Kim Phillips, Freescale Semiconductor.
     10  */
     11 
     12 #if defined(_KERNEL) || defined(_STANDALONE)
     13 #include <sys/param.h>
     14 #include <sys/types.h>
     15 #include <lib/libkern/libkern.h>
     16 #else
     17 #include <stdbool.h>
     18 #include <stddef.h>
     19 #include <stdint.h>
     20 #include <stdlib.h>
     21 #include <string.h>
     22 #include <limits.h>
     23 #endif
     24 
     25 #ifdef __CHECKER__
     26 #define FDT_FORCE __attribute__((force))
     27 #define FDT_BITWISE __attribute__((bitwise))
     28 #else
     29 #define FDT_FORCE
     30 #define FDT_BITWISE
     31 #endif
     32 
     33 typedef uint16_t FDT_BITWISE fdt16_t;
     34 typedef uint32_t FDT_BITWISE fdt32_t;
     35 typedef uint64_t FDT_BITWISE fdt64_t;
     36 
     37 #define EXTRACT_BYTE(x, n)	((unsigned long long)((uint8_t *)&x)[n])
     38 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
     39 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
     40 			 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
     41 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
     42 			 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
     43 			 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
     44 			 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
     45 
     46 static inline uint16_t fdt16_to_cpu(fdt16_t x)
     47 {
     48 	return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
     49 }
     50 static inline fdt16_t cpu_to_fdt16(uint16_t x)
     51 {
     52 	return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
     53 }
     54 
     55 static inline uint32_t fdt32_to_cpu(fdt32_t x)
     56 {
     57 	return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
     58 }
     59 static inline fdt32_t cpu_to_fdt32(uint32_t x)
     60 {
     61 	return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
     62 }
     63 
     64 static inline uint64_t fdt64_to_cpu(fdt64_t x)
     65 {
     66 	return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
     67 }
     68 static inline fdt64_t cpu_to_fdt64(uint64_t x)
     69 {
     70 	return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
     71 }
     72 #undef CPU_TO_FDT64
     73 #undef CPU_TO_FDT32
     74 #undef CPU_TO_FDT16
     75 #undef EXTRACT_BYTE
     76 
     77 #ifdef __APPLE__
     78 #include <AvailabilityMacros.h>
     79 
     80 /* strnlen() is not available on Mac OS < 10.7 */
     81 # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
     82                                          MAC_OS_X_VERSION_10_7)
     83 
     84 #define strnlen fdt_strnlen
     85 
     86 /*
     87  * fdt_strnlen: returns the length of a string or max_count - which ever is
     88  * smallest.
     89  * Input 1 string: the string whose size is to be determined
     90  * Input 2 max_count: the maximum value returned by this function
     91  * Output: length of the string or max_count (the smallest of the two)
     92  */
     93 static inline size_t fdt_strnlen(const char *string, size_t max_count)
     94 {
     95     const char *p = memchr(string, 0, max_count);
     96     return p ? p - string : max_count;
     97 }
     98 
     99 #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
    100           MAC_OS_X_VERSION_10_7) */
    101 
    102 #endif /* __APPLE__ */
    103 
    104 #endif /* LIBFDT_ENV_H */
    105