core: support for global shared buffers

Add support of allocating SHM shared with non-secure kernel
and exported to a non-secure userspace application.

Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>

3 files changed, 35 insertions, 0 deletions

diff --git a/core/arch/arm/include/kernel/thread.h b/core/arch/arm/include/kernel/thread.h
index cd6dd815..056fa340 100644
--- a/core/arch/arm/include/kernel/thread.h
+++ b/core/arch/arm/include/kernel/thread.h
@@ -628,6 +628,26 @@ uint32_t thread_rpc_cmd(uint32_t cmd, size_t num_params,
 unsigned long thread_smc(unsigned long func_id, unsigned long a1,
 			 unsigned long a2, unsigned long a3);
 
+/**
+ * Allocate data for payload buffers.
+ * Buffer is exported to user mode applications.
+ *
+ * @size:	size in bytes of payload buffer
+ * @cookie:	returned cookie used when freeing the buffer
+ *
+ * @returns	mobj that describes allocated buffer or NULL on error
+ */
+struct mobj *thread_rpc_alloc_global_payload(size_t size, uint64_t *cookie);
+
+/**
+ * Free physical memory previously allocated with
+ * thread_rpc_alloc_global_payload()
+ *
+ * @cookie:	cookie received when allocating the buffer
+ * @mobj:	mobj that describes the buffer
+ */
+void thread_rpc_free_global_payload(uint64_t cookie, struct mobj *mobj);
+
 #endif /*ASM*/
 
 #endif /*KERNEL_THREAD_H*/
diff --git a/core/arch/arm/kernel/thread.c b/core/arch/arm/kernel/thread.c
index ed8cb13d..119cf408 100644
--- a/core/arch/arm/kernel/thread.c
+++ b/core/arch/arm/kernel/thread.c
@@ -1573,3 +1573,13 @@ void thread_rpc_free_payload(uint64_t cookie, struct mobj *mobj)
 {
 	thread_rpc_free(OPTEE_MSG_RPC_SHM_TYPE_APPL, cookie, mobj);
 }
+
+struct mobj *thread_rpc_alloc_global_payload(size_t size, uint64_t *cookie)
+{
+	return thread_rpc_alloc(size, 8, OPTEE_MSG_RPC_SHM_TYPE_GLOBAL, cookie);
+}
+
+void thread_rpc_free_global_payload(uint64_t cookie, struct mobj *mobj)
+{
+	thread_rpc_free(OPTEE_MSG_RPC_SHM_TYPE_GLOBAL, cookie, mobj);
+}
diff --git a/core/include/optee_msg.h b/core/include/optee_msg.h
index bf59f82d..d5b858fa 100644
--- a/core/include/optee_msg.h
+++ b/core/include/optee_msg.h
@@ -397,6 +397,11 @@ struct optee_msg_arg {
 #define OPTEE_MSG_RPC_SHM_TYPE_APPL	0
 /* Memory only shared with non-secure kernel */
 #define OPTEE_MSG_RPC_SHM_TYPE_KERNEL	1
+/*
+ * Memory shared with non-secure kernel and exported to a non-secure user
+ * space application
+ */
+#define OPTEE_MSG_RPC_SHM_TYPE_GLOBAL	2
 
 /*
  * Free shared memory previously allocated with OPTEE_MSG_RPC_CMD_SHM_ALLOC