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/*
* Copyright (c) 2010-2012 United States Government, as represented by
* the Secretary of Defense. All rights reserved.
*
* This code has been derived from drivers/xen/tpmback/tpmback.c
* from the xen 2.6.18 linux kernel
*
* Copyright (c) 2005, IBM Corporation
*
* which was itself derived from drivers/xen/netback/netback.c
* from the xen 2.6.18 linux kernel
*
* Copyright (c) 2002-2004, K A Fraser
*
* This code has also been derived from drivers/xen/tpmback/xenbus.c
* from the xen 2.6.18 linux kernel
*
* Copyright (C) 2005 IBM Corporation
* Copyright (C) 2005 Rusty Russell <rusty@rustcorp.com.au>
*
* This code has also been derived from drivers/xen/tpmback/interface.c
* from the xen 2.6.18 linux kernel
*
* Copyright (c) 2005, IBM Corporation
*
* which was itself also derived from drvivers/xen/netback/interface.c
* from the xen 2.6.18 linux kernel
*
* Copyright (c) 2004, Keir Fraser
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2
* of the License
*/
#include <xen/io/tpmif.h>
#include <xen/io/xenbus.h>
#include <mini-os/types.h>
#include <xen/xen.h>
#ifndef TPMBACK_H
#define TPMBACK_H
struct tpmcmd {
domid_t domid; /* Domid of the frontend */
uint8_t locality; /* Locality requested by the frontend */
unsigned int handle; /* Handle of the frontend */
void *opaque; /* Opaque pointer taken from the tpmback instance */
uint8_t* req; /* tpm command bits, allocated by driver, DON'T FREE IT */
unsigned int req_len; /* Size of the command in buf - set by tpmback driver */
unsigned int resp_len; /* Size of the outgoing command,
you set this before passing the cmd object to tpmback_resp */
uint8_t* resp; /* Buffer for response - YOU MUST ALLOCATE IT, YOU MUST ALSO FREE IT */
};
typedef struct tpmcmd tpmcmd_t;
/* Initialize the tpm backend driver */
void init_tpmback(void (*open_cb)(domid_t, unsigned int), void (*close_cb)(domid_t, unsigned int));
/* Shutdown tpm backend driver */
void shutdown_tpmback(void);
/* Blocks until a tpm command is sent from any front end.
* Returns a pointer to the tpm command to handle.
* Do not try to free this pointer or the req buffer
* This function will return NULL if the tpm backend driver
* is shutdown or any other error occurs */
tpmcmd_t* tpmback_req_any(void);
/* Blocks until a tpm command from the frontend at domid/handle
* is sent.
* Returns NULL if domid/handle is not connected, tpmback is
* shutdown or shutting down, or if there is an error
*/
tpmcmd_t* tpmback_req(domid_t domid, unsigned int handle);
/* Send the response to the tpm command back to the frontend
* This function will free the tpmcmd object, but you must free the resp
* buffer yourself */
void tpmback_resp(tpmcmd_t* tpmcmd);
/* Waits for the first frontend to connect and then sets domid and handle appropriately.
* If one or more frontends are already connected, this will set domid and handle to one
* of them arbitrarily. The main use for this function is to wait until a single
* frontend connection has occured.
* returns 0 on success, non-zero on failure */
int tpmback_wait_for_frontend_connect(domid_t *domid, unsigned int *handle);
/* returns the number of frontends connected */
int tpmback_num_frontends(void);
/* Returns the uuid of the specified frontend, NULL on error.
* The return value is internally allocated, so don't free it */
unsigned char* tpmback_get_uuid(domid_t domid, unsigned int handle);
/* Get and set the opaque pointer for a tpmback instance */
void* tpmback_get_opaque(domid_t domid, unsigned int handle);
/* Returns zero if successful, nonzero on failure (no such frontend) */
int tpmback_set_opaque(domid_t domid, unsigned int handle, void* opaque);
#endif
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