1 files changed, 85 insertions, 0 deletions
diff --git a/core/tee/tee_fs_rpc_cache.c b/core/tee/tee_fs_rpc_cache.c
new file mode 100644
index 0000000..aef2eaa
--- /dev/null
+++ b/core/tee/tee_fs_rpc_cache.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2016, Linaro Limited
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <kernel/thread.h>
+#include <mm/core_memprot.h>
+#include <mm/core_mmu.h>
+#include <tee/tee_fs_rpc.h>
+
+void tee_fs_rpc_cache_clear(struct thread_specific_data *tsd)
+{
+	if (tsd->rpc_fs_payload) {
+		thread_rpc_free_payload(tsd->rpc_fs_payload_cookie);
+		tsd->rpc_fs_payload = NULL;
+		tsd->rpc_fs_payload_cookie = 0;
+		tsd->rpc_fs_payload_size = 0;
+	}
+}
+
+void *tee_fs_rpc_cache_alloc(size_t size, paddr_t *pa, uint64_t *cookie)
+{
+	struct thread_specific_data *tsd = thread_get_tsd();
+	size_t sz = size;
+	uint64_t c = 0;
+	paddr_t p;
+	void *va;
+
+	if (!size)
+		return NULL;
+
+	/*
+	 * Always allocate in page chunks as normal world allocates payload
+	 * memory as complete pages.
+	 */
+	sz = ROUNDUP(size, SMALL_PAGE_SIZE);
+
+	if (sz > tsd->rpc_fs_payload_size) {
+		tee_fs_rpc_cache_clear(tsd);
+
+		thread_rpc_alloc_payload(sz, &p, &c);
+		if (!p)
+			return NULL;
+		if (!ALIGNMENT_IS_OK(p, uint64_t))
+			goto err;
+
+		va = phys_to_virt(p, MEM_AREA_NSEC_SHM);
+		if (!va)
+			goto err;
+
+		tsd->rpc_fs_payload = va;
+		tsd->rpc_fs_payload_pa = p;
+		tsd->rpc_fs_payload_cookie = c;
+		tsd->rpc_fs_payload_size = sz;
+	}
+
+	*pa = tsd->rpc_fs_payload_pa;
+	*cookie = tsd->rpc_fs_payload_cookie;
+	return tsd->rpc_fs_payload;
+err:
+	thread_rpc_free_payload(c);
+	return NULL;
+}