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    Contents of /trunk/mkinitrd-magellan/busybox/include/platform.h

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 7709 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 Copyright 2006, Bernhard Fischer
    4
    5 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    6 */
    7 #ifndef __PLATFORM_H
    8 #define __PLATFORM_H 1
    9
    10 /* Convenience macros to test the version of gcc. */
    11 #undef __GNUC_PREREQ
    12 #if defined __GNUC__ && defined __GNUC_MINOR__
    13 # define __GNUC_PREREQ(maj, min) \
    14 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
    15 #else
    16 # define __GNUC_PREREQ(maj, min) 0
    17 #endif
    18
    19 /* __restrict is known in EGCS 1.2 and above. */
    20 #if !__GNUC_PREREQ (2,92)
    21 # ifndef __restrict
    22 # define __restrict /* Ignore */
    23 # endif
    24 #endif
    25
    26 /* Define macros for some gcc attributes. This permits us to use the
    27 macros freely, and know that they will come into play for the
    28 version of gcc in which they are supported. */
    29
    30 #if !__GNUC_PREREQ (2,7)
    31 # ifndef __attribute__
    32 # define __attribute__(x)
    33 # endif
    34 #endif
    35
    36 #undef inline
    37 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
    38 /* it's a keyword */
    39 #else
    40 # if __GNUC_PREREQ (2,7)
    41 # define inline __inline__
    42 # else
    43 # define inline
    44 # endif
    45 #endif
    46
    47 #ifndef __const
    48 # define __const const
    49 #endif
    50
    51 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
    52 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
    53 # define ATTRIBUTE_PACKED __attribute__ ((__packed__))
    54 # define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m)))
    55 # if __GNUC_PREREQ (3,0)
    56 # define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline)) inline
    57 # else
    58 # define ATTRIBUTE_ALWAYS_INLINE inline
    59 # endif
    60
    61 /* -fwhole-program makes all symbols local. The attribute externally_visible
    62 forces a symbol global. */
    63 # if __GNUC_PREREQ (4,1)
    64 # define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
    65 # else
    66 # define ATTRIBUTE_EXTERNALLY_VISIBLE
    67 # endif /* GNUC >= 4.1 */
    68
    69 /* We use __extension__ in some places to suppress -pedantic warnings
    70 about GCC extensions. This feature didn't work properly before
    71 gcc 2.8. */
    72 #if !__GNUC_PREREQ (2,8)
    73 # ifndef __extension__
    74 # define __extension__
    75 # endif
    76 #endif
    77
    78 /* gcc-2.95 had no va_copy but only __va_copy. */
    79 #if !__GNUC_PREREQ (3,0)
    80 # include <stdarg.h>
    81 # if !defined va_copy && defined __va_copy
    82 # define va_copy(d,s) __va_copy((d),(s))
    83 # endif
    84 #endif
    85
    86 /* ---- Endian Detection ------------------------------------ */
    87
    88 #if (defined __digital__ && defined __unix__)
    89 # include <sex.h>
    90 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
    91 # define __BYTE_ORDER BYTE_ORDER
    92 #elif !defined __APPLE__
    93 # include <byteswap.h>
    94 # include <endian.h>
    95 #endif
    96
    97 #ifdef __BIG_ENDIAN__
    98 # define BB_BIG_ENDIAN 1
    99 # define BB_LITTLE_ENDIAN 0
    100 #elif __BYTE_ORDER == __BIG_ENDIAN
    101 # define BB_BIG_ENDIAN 1
    102 # define BB_LITTLE_ENDIAN 0
    103 #else
    104 # define BB_BIG_ENDIAN 0
    105 # define BB_LITTLE_ENDIAN 1
    106 #endif
    107
    108 #if BB_BIG_ENDIAN
    109 #define SWAP_BE16(x) (x)
    110 #define SWAP_BE32(x) (x)
    111 #define SWAP_BE64(x) (x)
    112 #define SWAP_LE16(x) bswap_16(x)
    113 #define SWAP_LE32(x) bswap_32(x)
    114 #define SWAP_LE64(x) bswap_64(x)
    115 #else
    116 #define SWAP_BE16(x) bswap_16(x)
    117 #define SWAP_BE32(x) bswap_32(x)
    118 #define SWAP_BE64(x) bswap_64(x)
    119 #define SWAP_LE16(x) (x)
    120 #define SWAP_LE32(x) (x)
    121 #define SWAP_LE64(x) (x)
    122 #endif
    123
    124 /* ---- Networking ------------------------------------------ */
    125 #ifndef __APPLE__
    126 # include <arpa/inet.h>
    127 #else
    128 # include <netinet/in.h>
    129 #endif
    130
    131 #ifndef __socklen_t_defined
    132 typedef int socklen_t;
    133 #endif
    134
    135 /* ---- Compiler dependent settings ------------------------- */
    136 #if (defined __digital__ && defined __unix__)
    137 # undef HAVE_MNTENT_H
    138 #else
    139 # define HAVE_MNTENT_H 1
    140 #endif /* ___digital__ && __unix__ */
    141
    142 /*----- Kernel versioning ------------------------------------*/
    143 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
    144
    145 /* ---- miscellaneous --------------------------------------- */
    146
    147 #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
    148 !defined(__dietlibc__) && \
    149 !defined(_NEWLIB_VERSION) && \
    150 !(defined __digital__ && defined __unix__)
    151 # error "Sorry, this libc version is not supported :("
    152 #endif
    153
    154 // Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead.
    155
    156 #if defined __GLIBC__ || defined __UCLIBC__ \
    157 || defined __dietlibc__ || defined _NEWLIB_VERSION
    158 #include <features.h>
    159 #define HAVE_FEATURES_H
    160 #include <stdint.h>
    161 #define HAVE_STDINT_H
    162 #else
    163 /* Largest integral types. */
    164 #if __BIG_ENDIAN__
    165 typedef long int intmax_t;
    166 typedef unsigned long int uintmax_t;
    167 #else
    168 __extension__
    169 typedef long long int intmax_t;
    170 __extension__
    171 typedef unsigned long long int uintmax_t;
    172 #endif
    173 #endif
    174
    175 /* Size-saving "small" ints (arch-dependent) */
    176 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
    177 /* add other arches which benefit from this... */
    178 typedef signed char smallint;
    179 typedef unsigned char smalluint;
    180 #else
    181 /* for arches where byte accesses generate larger code: */
    182 typedef int smallint;
    183 typedef unsigned smalluint;
    184 #endif
    185
    186 /* uclibc does not implement daemon() for no-mmu systems.
    187 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
    188 * For earlier versions there is no reliable way to check if we are building
    189 * for a mmu-less system; the user should pass EXTRA_CFLAGS="-DBB_NOMMU"
    190 * on his own.
    191 */
    192 #if defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
    193 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__
    194 #define BB_NOMMU
    195 #endif
    196
    197 /* Platforms that haven't got dprintf need to implement fdprintf() in
    198 * libbb. This would require a platform.c. It's not going to be cleaned
    199 * out of the tree, so stop saying it should be. */
    200 #if !defined(__dietlibc__)
    201 /* Needed for: glibc */
    202 /* Not needed for: dietlibc */
    203 /* Others: ?? (add as needed) */
    204 #define fdprintf dprintf
    205 #endif
    206
    207 #if defined(__dietlibc__)
    208 static ATTRIBUTE_ALWAYS_INLINE char* strchrnul(const char *s, char c) {
    209 while (*s && *s != c) ++s;
    210 return (char*)s;
    211 }
    212 #endif
    213
    214 /* Don't use lchown with glibc older than 2.1.x ... uC-libc lacks it */
    215 #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \
    216 defined __UC_LIBC__
    217 # define lchown chown
    218 #endif
    219
    220 /* THIS SHOULD BE CLEANED OUT OF THE TREE ENTIRELY */
    221 /* FIXME: fix tar.c! */
    222 #ifndef FNM_LEADING_DIR
    223 #define FNM_LEADING_DIR 0
    224 #endif
    225
    226 #if (defined __digital__ && defined __unix__)
    227 #include <standards.h>
    228 #define HAVE_STANDARDS_H
    229 #include <inttypes.h>
    230 #define HAVE_INTTYPES_H
    231 #define PRIu32 "u"
    232
    233 /* use legacy setpgrp(pidt_,pid_t) for now. move to platform.c */
    234 #define bb_setpgrp do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
    235
    236 #if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
    237 #define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
    238 #endif
    239 #if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
    240 #define ADJ_FREQUENCY MOD_FREQUENCY
    241 #endif
    242 #if !defined ADJ_TIMECONST && defined MOD_TIMECONST
    243 #define ADJ_TIMECONST MOD_TIMECONST
    244 #endif
    245 #if !defined ADJ_TICK && defined MOD_CLKB
    246 #define ADJ_TICK MOD_CLKB
    247 #endif
    248
    249 #else
    250 #define bb_setpgrp setpgrp()
    251 #endif
    252
    253 #if defined(__linux__)
    254 #include <sys/mount.h>
    255 // Make sure we have all the new mount flags we actually try to use.
    256 #ifndef MS_BIND
    257 #define MS_BIND (1<<12)
    258 #endif
    259 #ifndef MS_MOVE
    260 #define MS_MOVE (1<<13)
    261 #endif
    262 #ifndef MS_RECURSIVE
    263 #define MS_RECURSIVE (1<<14)
    264 #endif
    265 #ifndef MS_SILENT
    266 #define MS_SILENT (1<<15)
    267 #endif
    268
    269 // The shared subtree stuff, which went in around 2.6.15
    270 #ifndef MS_UNBINDABLE
    271 #define MS_UNBINDABLE (1<<17)
    272 #endif
    273 #ifndef MS_PRIVATE
    274 #define MS_PRIVATE (1<<18)
    275 #endif
    276 #ifndef MS_SLAVE
    277 #define MS_SLAVE (1<<19)
    278 #endif
    279 #ifndef MS_SHARED
    280 #define MS_SHARED (1<<20)
    281 #endif
    282
    283
    284 #if !defined(BLKSSZGET)
    285 #define BLKSSZGET _IO(0x12, 104)
    286 #endif
    287 #if !defined(BLKGETSIZE64)
    288 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
    289 #endif
    290 #endif
    291
    292 #endif /* platform.h */