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host: Perform compile-time endian check if supported

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mintsuki 2023-05-14 05:13:09 +02:00
parent 7989064599
commit 153412f53e
1 changed files with 16 additions and 2 deletions
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18
host/limine.c
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@ -151,8 +151,6 @@ static uint32_t crc32(void *_stream, size_t len) {
return ret;
}
static bool bigendian = false;
static uint16_t endswap16(uint16_t value) {
uint16_t ret = 0;
ret |= (value >> 8) & 0x00ff;
@ -182,6 +180,20 @@ static uint64_t endswap64(uint64_t value) {
return ret;
}
#ifdef __BYTE_ORDER__
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define bigendian true
#else
#define bigendian false
#endif
#else /* !__BYTE_ORDER__ */
static bool bigendian = false;
#endif /* !__BYTE_ORDER__ */
#define ENDSWAP(VALUE) (bigendian ? ( \
sizeof(VALUE) == 1 ? (VALUE) : \
sizeof(VALUE) == 2 ? endswap16(VALUE) : \
@ -535,9 +547,11 @@ static int bios_install(int argc, char *argv[]) {
uint8_t orig_mbr[70], timestamp[6];
const char *part_ndx = NULL;
#ifndef __BYTE_ORDER__
uint32_t endcheck = 0x12345678;
uint8_t endbyte = *((uint8_t *)&endcheck);
bigendian = endbyte == 0x12;
#endif
if (argc < 2) {
bios_install_usage(argv[-1]);