Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / arch / i386 / include / bits / byteswap.h

diff --git a/qemu/roms/ipxe/src/arch/i386/include/bits/byteswap.h b/qemu/roms/ipxe/src/arch/i386/include/bits/byteswap.h
new file mode 100644 (file)
index 0000000..0d9cb96
--- /dev/null
+++ b/qemu/roms/ipxe/src/arch/i386/include/bits/byteswap.h
@@ -0,0 +1,70 @@
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H
+
+/** @file
+ *
+ * Byte-order swapping functions
+ *
+ */
+
+#include <stdint.h>
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+static inline __attribute__ (( always_inline, const )) uint16_t
+__bswap_variable_16 ( uint16_t x ) {
+       __asm__ ( "xchgb %b0,%h0" : "=q" ( x ) : "0" ( x ) );
+       return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_16s ( uint16_t *x ) {
+       __asm__ ( "rorw $8, %0" : "+m" ( *x ) );
+}
+
+static inline __attribute__ (( always_inline, const )) uint32_t
+__bswap_variable_32 ( uint32_t x ) {
+       __asm__ ( "bswapl %0" : "=r" ( x ) : "0" ( x ) );
+       return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_32s ( uint32_t *x ) {
+       __asm__ ( "bswapl %0" : "=r" ( *x ) : "0" ( *x ) );
+}
+
+static inline __attribute__ (( always_inline, const )) uint64_t
+__bswap_variable_64 ( uint64_t x ) {
+       uint32_t in_high = ( x >> 32 );
+       uint32_t in_low = ( x & 0xffffffffUL );
+       uint32_t out_high;
+       uint32_t out_low;
+
+       __asm__ ( "bswapl %0\n\t"
+                 "bswapl %1\n\t"
+                 "xchgl %0,%1\n\t"
+                 : "=r" ( out_high ), "=r" ( out_low )
+                 : "0" ( in_high ), "1" ( in_low ) );
+
+       return ( ( ( ( uint64_t ) out_high ) << 32 ) |
+                ( ( uint64_t ) out_low ) );
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_64s ( uint64_t *x ) {
+       struct {
+               uint32_t __attribute__ (( may_alias )) low;
+               uint32_t __attribute__ (( may_alias )) high;
+       } __attribute__ (( may_alias )) *dwords = ( ( void * ) x );
+       uint32_t discard;
+
+       __asm__ ( "movl %0,%2\n\t"
+                 "bswapl %2\n\t"
+                 "xchgl %2,%1\n\t"
+                 "bswapl %2\n\t"
+                 "movl %2,%0\n\t"
+                 : "+m" ( dwords->low ), "+m" ( dwords->high ),
+                   "=r" ( discard ) );
+}
+
+#endif /* _BITS_BYTESWAP_H */