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+/*
+ * This confidential and proprietary software may be used only as
+ * authorised by a licensing agreement from ARM Limited
+ * (C) COPYRIGHT 2008-2010 ARM Limited
+ * ALL RIGHTS RESERVED
+ * The entire notice above must be reproduced on all authorised
+ * copies and copies may only be made to the extent permitted
+ * by a licensing agreement from ARM Limited.
+ */
+
+/**
+ * @file ump.h
+ *
+ * This file contains the user space part of the UMP API.
+ */
+
+#ifndef _UNIFIED_MEMORY_PROVIDER_H_
+#define _UNIFIED_MEMORY_PROVIDER_H_
+
+
+/** @defgroup ump_user_space_api UMP User Space API
+ * @{ */
+
+
+#include "ump_platform.h"
+
+
+#include "ion.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * External representation of a UMP handle in user space.
+ */
+typedef void * ump_handle;
+
+/**
+ * Typedef for a secure ID, a system wide identificator for UMP memory buffers.
+ */
+typedef unsigned int ump_secure_id;
+
+/**
+ * Value to indicate an invalid UMP memory handle.
+ */
+#define UMP_INVALID_MEMORY_HANDLE ((ump_handle)0)
+
+/**
+ * Value to indicate an invalid secure Id.
+ */
+#define UMP_INVALID_SECURE_ID ((ump_secure_id)-1)
+
+/**
+ * UMP error codes for user space.
+ */
+typedef enum
+{
+ UMP_OK, /**< indicates success */
+ UMP_ERROR, /**< indicates failure */
+} ump_result;
+
+
+/**
+ * Opens and initializes the UMP library.
+ *
+ * This function must be called at least once before calling any other UMP API functions.
+ * Each open is reference counted and must be matched with a call to @ref ump_close "ump_close".
+ *
+ * @see ump_close
+ *
+ * @return UMP_OK indicates success, UMP_ERROR indicates failure.
+ */
+UMP_API_EXPORT ump_result ump_open(void);
+
+
+/**
+ * Terminate the UMP library.
+ *
+ * This must be called once for every successful @ref ump_open "ump_open". The UMP library is
+ * terminated when, and only when, the last open reference to the UMP interface is closed.
+ *
+ * @see ump_open
+ */
+UMP_API_EXPORT void ump_close(void);
+
+
+/**
+ * Retrieves the secure ID for the specified UMP memory.
+ *
+ * This identificator is unique across the entire system, and uniquely identifies
+ * the specified UMP memory. This identificator can later be used through the
+ * @ref ump_handle_create_from_secure_id "ump_handle_create_from_secure_id" or
+ * @ref ump_dd_handle_create_from_secure_id "ump_dd_handle_create_from_secure_id"
+ * functions in order to access this UMP memory, for instance from another process.
+ *
+ * @note There is a kernel space equivalent function called @ref ump_dd_secure_id_get "ump_dd_secure_id_get"
+ *
+ * @see ump_handle_create_from_secure_id
+ * @see ump_dd_handle_create_from_secure_id
+ * @see ump_dd_secure_id_get
+ *
+ * @param mem Handle to UMP memory.
+ *
+ * @return Returns the secure ID for the specified UMP memory.
+ */
+UMP_API_EXPORT ump_secure_id ump_secure_id_get(ump_handle mem);
+
+
+/**
+ * Retrieves a handle to allocated UMP memory.
+ *
+ * The usage of UMP memory is reference counted, so this will increment the reference
+ * count by one for the specified UMP memory.
+ * Use @ref ump_reference_release "ump_reference_release" when there is no longer any
+ * use for the retrieved handle.
+ *
+ * @note There is a kernel space equivalent function called @ref ump_dd_handle_create_from_secure_id "ump_dd_handle_create_from_secure_id"
+ *
+ * @see ump_reference_release
+ * @see ump_dd_handle_create_from_secure_id
+ *
+ * @param secure_id The secure ID of the UMP memory to open, that can be retrieved using the @ref ump_secure_id_get "ump_secure_id_get " function.
+ *
+ * @return UMP_INVALID_MEMORY_HANDLE indicates failure, otherwise a valid handle is returned.
+ */
+UMP_API_EXPORT ump_handle ump_handle_create_from_secure_id(ump_secure_id secure_id);
+
+
+/**
+ * Retrieves the actual size of the specified UMP memory.
+ *
+ * The size is reported in bytes, and is typically page aligned.
+ *
+ * @note There is a kernel space equivalent function called @ref ump_dd_size_get "ump_dd_size_get"
+ *
+ * @see ump_dd_size_get
+ *
+ * @param mem Handle to UMP memory.
+ *
+ * @return Returns the allocated size of the specified UMP memory, in bytes.
+ */
+UMP_API_EXPORT unsigned long ump_size_get(ump_handle mem);
+
+
+/**
+ * Read from specified UMP memory.
+ *
+ * Another way of reading from (and writing to) UMP memory is to use the
+ * @ref ump_mapped_pointer_get "ump_mapped_pointer_get" to retrieve
+ * a CPU mapped pointer to the memory.
+ *
+ * @see ump_mapped_pointer_get
+ *
+ * @param dst Destination buffer.
+ * @param src Handle to UMP memory to read from.
+ * @param offset Where to start reading, given in bytes.
+ * @param length How much to read, given in bytes.
+ */
+UMP_API_EXPORT void ump_read(void * dst, ump_handle src, unsigned long offset, unsigned long length);
+
+
+/**
+ * Write to specified UMP memory.
+ *
+ * Another way of writing to (and reading from) UMP memory is to use the
+ * @ref ump_mapped_pointer_get "ump_mapped_pointer_get" to retrieve
+ * a CPU mapped pointer to the memory.
+ *
+ * @see ump_mapped_pointer_get
+ *
+ * @param dst Handle to UMP memory to write to.
+ * @param offset Where to start writing, given in bytes.
+ * @param src Buffer to read from.
+ * @param length How much to write, given in bytes.
+ */
+UMP_API_EXPORT void ump_write(ump_handle dst, unsigned long offset, const void * src, unsigned long length);
+
+
+/**
+ * Retrieves a memory mapped pointer to the specified UMP memory.
+ *
+ * This function retrieves a memory mapped pointer to the specified UMP memory,
+ * that can be used by the CPU. Every successful call to
+ * @ref ump_mapped_pointer_get "ump_mapped_pointer_get" is reference counted,
+ * and must therefor be followed by a call to
+ * @ref ump_mapped_pointer_release "ump_mapped_pointer_release " when the
+ * memory mapping is no longer needed.
+ *
+ * @note Systems without a MMU for the CPU only return the physical address, because no mapping is required.
+ *
+ * @see ump_mapped_pointer_release
+ *
+ * @param mem Handle to UMP memory.
+ *
+ * @return NULL indicates failure, otherwise a CPU mapped pointer is returned.
+ */
+UMP_API_EXPORT void * ump_mapped_pointer_get(ump_handle mem);
+
+
+/**
+ * Releases a previously mapped pointer to the specified UMP memory.
+ *
+ * The CPU mapping of the specified UMP memory memory is reference counted,
+ * so every call to @ref ump_mapped_pointer_get "ump_mapped_pointer_get" must
+ * be matched with a call to this function when the mapping is no longer needed.
+ *
+ * The CPU mapping is not removed before all references to the mapping is released.
+ *
+ * @note Systems without a MMU must still implement this function, even though no unmapping should be needed.
+ *
+ * @param mem Handle to UMP memory.
+ */
+UMP_API_EXPORT void ump_mapped_pointer_release(ump_handle mem);
+
+
+/**
+ * Adds an extra reference to the specified UMP memory.
+ *
+ * This function adds an extra reference to the specified UMP memory. This function should
+ * be used every time a UMP memory handle is duplicated, that is, assigned to another ump_handle
+ * variable. The function @ref ump_reference_release "ump_reference_release" must then be used
+ * to release each copy of the UMP memory handle.
+ *
+ * @note You are not required to call @ref ump_reference_add "ump_reference_add"
+ * for UMP handles returned from
+ * @ref ump_handle_create_from_secure_id "ump_handle_create_from_secure_id",
+ * because these handles are already reference counted by this function.
+ *
+ * @note There is a kernel space equivalent function called @ref ump_dd_reference_add "ump_dd_reference_add"
+ *
+ * @see ump_dd_reference_add
+ *
+ * @param mem Handle to UMP memory.
+ */
+UMP_API_EXPORT void ump_reference_add(ump_handle mem);
+
+
+/**
+ * Releases a reference from the specified UMP memory.
+ *
+ * This function should be called once for every reference to the UMP memory handle.
+ * When the last reference is released, all resources associated with this UMP memory
+ * handle are freed.
+ *
+ * @note There is a kernel space equivalent function called @ref ump_dd_reference_release "ump_dd_reference_release"
+ *
+ * @see ump_dd_reference_release
+ *
+ * @param mem Handle to UMP memory.
+ */
+UMP_API_EXPORT void ump_reference_release(ump_handle mem);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+/** @} */ /* end group ump_user_space_api */
+
+
+#endif /*_UNIFIED_MEMORY_PROVIDER_H_ */