[PATCH 09/12] include: add endian.h support

[Daniel Gomez via B4 Relay <devnull+da.gomez.samsung.com@kernel.org>]

From: Daniel Gomez <da.gomez@samsung.com>

macOS hosts do not include endian.h header required for gen-hyper
object. Add a copy of the include/endian.h from the GNU C Library
(glibc), version glib-2.40 into include/endian and a copy of bits/
uintn-identity.h into include/endian/bits and update the gen-hyper
Makefile to include the library path.

Remove the following from glibc include/endian.h:

diff --git a/include/endian/endian.h b/include/endian/endian.h
index fd20a2b1985d..f70e07f1d3c6 100644
--- a/include/endian/endian.h
+++ b/include/endian/endian.h
@@ -18,11 +18,6 @@
 #ifndef        _ENDIAN_H
 #define        _ENDIAN_H       1

-#include <features.h>
-
-/* Get the definitions of __*_ENDIAN, __BYTE_ORDER, and __FLOAT_WORD_ORDER.  */
-#include <bits/endian.h>
-
 #ifdef __USE_MISC
 # define LITTLE_ENDIAN __LITTLE_ENDIAN
 # define BIG_ENDIAN    __BIG_ENDIAN
@@ -30,9 +25,6 @@
 # define BYTE_ORDER    __BYTE_ORDER
 #endif

-#if defined __USE_MISC && !defined __ASSEMBLER__
-/* Conversion interfaces.  */
-# include <bits/byteswap.h>
 # include <bits/uintn-identity.h>

 # if __BYTE_ORDER == __LITTLE_ENDIAN
@@ -67,6 +59,5 @@
 #  define be64toh(x) __uint64_identity (x)
 #  define le64toh(x) __bswap_64 (x)
 # endif
-#endif

 #endif /* endian.h */

Remove the following from glibc bits/uintn-identity.h:

diff --git a/include/endian/bits/uintn-identity.h b/include/endian/bits/uintn-identity.h
index 8104070583c7..0310c9d955da 100644
--- a/include/endian/bits/uintn-identity.h
+++ b/include/endian/bits/uintn-identity.h
@@ -23,8 +23,6 @@
 #ifndef _BITS_UINTN_IDENTITY_H
 #define _BITS_UINTN_IDENTITY_H 1

-#include <bits/types.h>
-
 /* These inline functions are to ensure the appropriate type
    conversions and associated diagnostics from macros that convert to
    a given endianness.  */

Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
---
 arch/arm64/kvm/hyp/nvhe/Makefile     |  2 +-
 include/endian/bits/uintn-identity.h | 48 +++++++++++++++++++++++++++
 include/endian/endian.h              | 63 ++++++++++++++++++++++++++++++++++++
 3 files changed, 112 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 40541c0812bf..1bbe2c2a4aed 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -15,7 +15,7 @@ ccflags-y += -fno-stack-protector	\
 	     $(DISABLE_STACKLEAK_PLUGIN)
 
 hostprogs := gen-hyprel
-HOST_EXTRACFLAGS += -I$(objtree)/include -I$(srctree)/include/elf
+HOST_EXTRACFLAGS += -I$(objtree)/include -I$(srctree)/include/elf -I$(srctree)/include/endian
 
 lib-objs := clear_page.o copy_page.o memcpy.o memset.o
 lib-objs := $(addprefix ../../../lib/, $(lib-objs))
diff --git a/include/endian/bits/uintn-identity.h b/include/endian/bits/uintn-identity.h
new file mode 100644
index 000000000000..0310c9d955da
--- /dev/null
+++ b/include/endian/bits/uintn-identity.h
@@ -0,0 +1,48 @@
+/* Inline functions to return unsigned integer values unchanged.
+   Copyright (C) 2017-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#if !defined _NETINET_IN_H && !defined _ENDIAN_H
+# error "Never use <bits/uintn-identity.h> directly; include <netinet/in.h> or <endian.h> instead."
+#endif
+
+#ifndef _BITS_UINTN_IDENTITY_H
+#define _BITS_UINTN_IDENTITY_H 1
+
+/* These inline functions are to ensure the appropriate type
+   conversions and associated diagnostics from macros that convert to
+   a given endianness.  */
+
+static __inline __uint16_t
+__uint16_identity (__uint16_t __x)
+{
+  return __x;
+}
+
+static __inline __uint32_t
+__uint32_identity (__uint32_t __x)
+{
+  return __x;
+}
+
+static __inline __uint64_t
+__uint64_identity (__uint64_t __x)
+{
+  return __x;
+}
+
+#endif /* _BITS_UINTN_IDENTITY_H.  */
diff --git a/include/endian/endian.h b/include/endian/endian.h
new file mode 100644
index 000000000000..f70e07f1d3c6
--- /dev/null
+++ b/include/endian/endian.h
@@ -0,0 +1,63 @@
+/* Copyright (C) 1992-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef	_ENDIAN_H
+#define	_ENDIAN_H	1
+
+#ifdef __USE_MISC
+# define LITTLE_ENDIAN	__LITTLE_ENDIAN
+# define BIG_ENDIAN	__BIG_ENDIAN
+# define PDP_ENDIAN	__PDP_ENDIAN
+# define BYTE_ORDER	__BYTE_ORDER
+#endif
+
+# include <bits/uintn-identity.h>
+
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define htobe16(x) __bswap_16 (x)
+#  define htole16(x) __uint16_identity (x)
+#  define be16toh(x) __bswap_16 (x)
+#  define le16toh(x) __uint16_identity (x)
+
+#  define htobe32(x) __bswap_32 (x)
+#  define htole32(x) __uint32_identity (x)
+#  define be32toh(x) __bswap_32 (x)
+#  define le32toh(x) __uint32_identity (x)
+
+#  define htobe64(x) __bswap_64 (x)
+#  define htole64(x) __uint64_identity (x)
+#  define be64toh(x) __bswap_64 (x)
+#  define le64toh(x) __uint64_identity (x)
+
+# else
+#  define htobe16(x) __uint16_identity (x)
+#  define htole16(x) __bswap_16 (x)
+#  define be16toh(x) __uint16_identity (x)
+#  define le16toh(x) __bswap_16 (x)
+
+#  define htobe32(x) __uint32_identity (x)
+#  define htole32(x) __bswap_32 (x)
+#  define be32toh(x) __uint32_identity (x)
+#  define le32toh(x) __bswap_32 (x)
+
+#  define htobe64(x) __uint64_identity (x)
+#  define htole64(x) __bswap_64 (x)
+#  define be64toh(x) __uint64_identity (x)
+#  define le64toh(x) __bswap_64 (x)
+# endif
+
+#endif	/* endian.h */

-- 
Git-146)