Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 232 insertions, 0 deletions

diff --git a/qemu/roms/ipxe/src/arch/x86/include/bits/string.h b/qemu/roms/ipxe/src/arch/x86/include/bits/string.h
new file mode 100644
index 000000000..dce994983
--- /dev/null
+++ b/qemu/roms/ipxe/src/arch/x86/include/bits/string.h
@@ -0,0 +1,232 @@
+#ifndef X86_BITS_STRING_H
+#define X86_BITS_STRING_H
+
+/*
+ * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * Optimised string operations
+ *
+ */
+
+#define __HAVE_ARCH_MEMCPY
+
+extern void * __memcpy ( void *dest, const void *src, size_t len );
+extern void * __memcpy_reverse ( void *dest, const void *src, size_t len );
+
+/**
+ * Copy memory area (where length is a compile-time constant)
+ *
+ * @v dest		Destination address
+ * @v src		Source address
+ * @v len		Length
+ * @ret dest		Destination address
+ */
+static inline __attribute__ (( always_inline )) void *
+__constant_memcpy ( void *dest, const void *src, size_t len ) {
+	union {
+		uint32_t u32[2];
+		uint16_t u16[4];
+		uint8_t  u8[8];
+	} __attribute__ (( __may_alias__ )) *dest_u = dest;
+	const union {
+		uint32_t u32[2];
+		uint16_t u16[4];
+		uint8_t  u8[8];
+	} __attribute__ (( __may_alias__ )) *src_u = src;
+	const void *esi;
+	void *edi;
+
+	switch ( len ) {
+	case 0 : /* 0 bytes */
+		return dest;
+	/*
+	 * Single-register moves; these are always better than a
+	 * string operation.  We can clobber an arbitrary two
+	 * registers (data, source, dest can re-use source register)
+	 * instead of being restricted to esi and edi.  There's also a
+	 * much greater potential for optimising with nearby code.
+	 *
+	 */
+	case 1 : /* 4 bytes */
+		dest_u->u8[0]  = src_u->u8[0];
+		return dest;
+	case 2 : /* 6 bytes */
+		dest_u->u16[0] = src_u->u16[0];
+		return dest;
+	case 4 : /* 4 bytes */
+		dest_u->u32[0] = src_u->u32[0];
+		return dest;
+	/*
+	 * Double-register moves; these are probably still a win.
+	 *
+	 */
+	case 3 : /* 12 bytes */
+		dest_u->u16[0] = src_u->u16[0];
+		dest_u->u8[2]  = src_u->u8[2];
+		return dest;
+	case 5 : /* 10 bytes */
+		dest_u->u32[0] = src_u->u32[0];
+		dest_u->u8[4]  = src_u->u8[4];
+		return dest;
+	case 6 : /* 12 bytes */
+		dest_u->u32[0] = src_u->u32[0];
+		dest_u->u16[2] = src_u->u16[2];
+		return dest;
+	case 8 : /* 10 bytes */
+		dest_u->u32[0] = src_u->u32[0];
+		dest_u->u32[1] = src_u->u32[1];
+		return dest;
+	}
+
+	/* Even if we have to load up esi and edi ready for a string
+	 * operation, we can sometimes save space by using multiple
+	 * single-byte "movs" operations instead of loading up ecx and
+	 * using "rep movsb".
+	 *
+	 * "load ecx, rep movsb" is 7 bytes, plus an average of 1 byte
+	 * to allow for saving/restoring ecx 50% of the time.
+	 *
+	 * "movsl" and "movsb" are 1 byte each, "movsw" is two bytes.
+	 * (In 16-bit mode, "movsl" is 2 bytes and "movsw" is 1 byte,
+	 * but "movsl" moves twice as much data, so it balances out).
+	 *
+	 * The cutoff point therefore occurs around 26 bytes; the byte
+	 * requirements for each method are:
+	 *
+	 * len		   16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
+	 * #bytes (ecx)	    8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8
+	 * #bytes (no ecx)  4  5  6  7  5  6  7  8  6  7  8  9  7  8  9 10
+	 */
+
+	esi = src;
+	edi = dest;
+	
+	if ( len >= 26 )
+		return __memcpy ( dest, src, len );
+	
+	if ( len >= 6*4 )
+		__asm__ __volatile__ ( "movsl" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+	if ( len >= 5*4 )
+		__asm__ __volatile__ ( "movsl" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+	if ( len >= 4*4 )
+		__asm__ __volatile__ ( "movsl" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+	if ( len >= 3*4 )
+		__asm__ __volatile__ ( "movsl" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+	if ( len >= 2*4 )
+		__asm__ __volatile__ ( "movsl" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+	if ( len >= 1*4 )
+		__asm__ __volatile__ ( "movsl" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+	if ( ( len % 4 ) >= 2 )
+		__asm__ __volatile__ ( "movsw" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+	if ( ( len % 2 ) >= 1 )
+		__asm__ __volatile__ ( "movsb" : "=&D" ( edi ), "=&S" ( esi )
+				       : "0" ( edi ), "1" ( esi ) : "memory" );
+
+	return dest;
+}
+
+/**
+ * Copy memory area
+ *
+ * @v dest		Destination address
+ * @v src		Source address
+ * @v len		Length
+ * @ret dest		Destination address
+ */
+static inline __attribute__ (( always_inline )) void *
+memcpy ( void *dest, const void *src, size_t len ) {
+	if ( __builtin_constant_p ( len ) ) {
+		return __constant_memcpy ( dest, src, len );
+	} else {
+		return __memcpy ( dest, src, len );
+	}
+}
+
+#define __HAVE_ARCH_MEMMOVE
+
+extern void * __memmove ( void *dest, const void *src, size_t len );
+
+/**
+ * Copy (possibly overlapping) memory area
+ *
+ * @v dest		Destination address
+ * @v src		Source address
+ * @v len		Length
+ * @ret dest		Destination address
+ */
+static inline __attribute__ (( always_inline )) void *
+memmove ( void *dest, const void *src, size_t len ) {
+	ssize_t offset = ( dest - src );
+
+	if ( __builtin_constant_p ( offset ) ) {
+		if ( offset <= 0 ) {
+			return memcpy ( dest, src, len );
+		} else {
+			return __memcpy_reverse ( dest, src, len );
+		}
+	} else {
+		return __memmove ( dest, src, len );
+	}
+}
+
+#define __HAVE_ARCH_MEMSET
+
+/**
+ * Fill memory region
+ *
+ * @v dest		Destination address
+ * @v fill		Fill pattern
+ * @v len		Length
+ * @ret dest		Destination address
+ */
+static inline void * memset ( void *dest, int fill, size_t len ) {
+	void *discard_D;
+	size_t discard_c;
+
+	__asm__ __volatile__ ( "rep stosb"
+			       : "=&D" ( discard_D ), "=&c" ( discard_c )
+			       : "0" ( dest ), "1" ( len ), "a" ( fill )
+			       : "memory" );
+	return dest;
+}
+
+#define __HAVE_ARCH_MEMSWAP
+
+extern void * memswap ( void *dest, void *src, size_t len );
+
+#define __HAVE_ARCH_STRNCMP
+
+extern int strncmp ( const char *str1, const char *str2, size_t len );
+
+#define __HAVE_ARCH_STRLEN
+
+extern size_t strlen ( const char *string );
+
+#endif /* X86_BITS_STRING_H */