feat(memory share): check memory region desc values
This patch introduces a helper function to check that the values
provided in the memory region descriptor are valid and safe.
Offset values are within safe bounds, receiver count will not
cause overflows and reserved fields are 0.
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: If3e751cf80cd5a0ecbcc77245a91daac50465a5c
diff --git a/inc/vmapi/hf/ffa.h b/inc/vmapi/hf/ffa.h
index 8b61fbe..4ab3592 100644
--- a/inc/vmapi/hf/ffa.h
+++ b/inc/vmapi/hf/ffa.h
@@ -23,6 +23,17 @@
#define FFA_VERSION_COMPILED \
MAKE_FFA_VERSION(FFA_VERSION_MAJOR, FFA_VERSION_MINOR)
+/**
+ * Check major versions are equal and the minor version of the caller is
+ * less than or equal to the minor version of the callee.
+ */
+#define FFA_VERSIONS_ARE_COMPATIBLE(v_caller, v_callee) \
+ ((((v_caller >> FFA_VERSION_MAJOR_OFFSET) & FFA_VERSION_MAJOR_MASK) == \
+ ((v_callee >> FFA_VERSION_MAJOR_OFFSET) & \
+ FFA_VERSION_MAJOR_MASK)) && \
+ (((v_caller >> FFA_VERSION_MINOR_OFFSET) & FFA_VERSION_MINOR_MASK) <= \
+ ((v_callee >> FFA_VERSION_MINOR_OFFSET) & FFA_VERSION_MINOR_MASK)))
+
/* clang-format off */
#define FFA_LOW_32_ID 0x84000060
@@ -1128,6 +1139,13 @@
};
/**
+ * Returns the first FF-A version that matches the memory access descriptor
+ * size.
+ */
+uint32_t ffa_version_from_memory_access_desc_size(
+ uint32_t memory_access_desc_size);
+
+/**
* To maintain forwards compatability we can't make assumptions about the size
* of the endpoint memory access descriptor so provide a helper function
* to get a receiver from the receiver array using the memory access descriptor