libmctp: Import libmctp library handling MCTP protocol

The Management Component Transport Protocol (MCTP) is a protocol defined by
the DMTF Platform Management Component Intercommunications sub-team of the
DMTF Pre-OS Workgroup. MCTP is designed to support communications between
different intelligent hardware components that make up a platform
management subsystem that is provides monitoring and control functions
inside a managed system. DMTF standard "DSP2016"

This library is intended to be a portable implementation of the Management
Component Transport Protocol (MCTP), as defined by DMTF standard "DSP0236",
plus transport binding specifications.
MCTP has been designed to carry multiple types of manageability-related
traffic across a common medium. The base MCTP specifications define
message types for supporting the initialization and configuration of MCTP
itself, and to support vendor-specific messages over MCTP.
Other message types, such as message types to support a Platform Level
Data Model (PLDM).

The source is located here: https://github.com/openbmc/libmctp and use as
is, without any update.

The libmctp code is integrated into the folder ./libmctp as a set of
sources, compiled if the compiler flag CONFIG_PLDM is set.

A config file is required. Not being generated automatically by 'configure',
it must be edited manually to match the environment.

Signed-off-by: Christophe Lombard <clombard@linux.ibm.com>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Reza Arbab <arbab@linux.ibm.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/libmctp/alloc.c b/libmctp/alloc.c
new file mode 100644
index 0000000..84c3f65
--- /dev/null
+++ b/libmctp/alloc.c
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
+
+#include <assert.h>
+
+#include "libmctp.h"
+#include "libmctp-alloc.h"
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+struct {
+	void *(*m_alloc)(size_t);
+	void (*m_free)(void *);
+	void *(*m_realloc)(void *, size_t);
+} alloc_ops = {
+#ifdef MCTP_DEFAULT_ALLOC
+	malloc,
+	free,
+	realloc,
+#endif
+};
+
+/* internal-only allocation functions */
+void *__mctp_alloc(size_t size)
+{
+	if (alloc_ops.m_alloc)
+		return alloc_ops.m_alloc(size);
+	if (alloc_ops.m_realloc)
+		return alloc_ops.m_realloc(NULL, size);
+	assert(0);
+	return NULL;
+}
+
+void __mctp_free(void *ptr)
+{
+	if (alloc_ops.m_free)
+		alloc_ops.m_free(ptr);
+	else if (alloc_ops.m_realloc)
+		alloc_ops.m_realloc(ptr, 0);
+	else
+		assert(0);
+}
+
+void *__mctp_realloc(void *ptr, size_t size)
+{
+	if (alloc_ops.m_realloc)
+		return alloc_ops.m_realloc(ptr, size);
+	assert(0);
+	return NULL;
+}
+
+void mctp_set_alloc_ops(void *(*m_alloc)(size_t), void (*m_free)(void *),
+			void *(m_realloc)(void *, size_t))
+{
+	alloc_ops.m_alloc = m_alloc;
+	alloc_ops.m_free = m_free;
+	alloc_ops.m_realloc = m_realloc;
+}