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/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS 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; either version 3 of the License, or
(at your option) any later version.
ChibiOS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chsmc.c
* @brief smc call module code.
*
* @addtogroup SMC
* @{
*/
#include "ch.h"
#include "chsmc.h"
/*===========================================================================*/
/* Module local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
thread_reference_t _ns_thread;
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
static memory_pool_t svcs_pool;
/*===========================================================================*/
/* Module local functions. */
/*===========================================================================*/
static bool isAddrSpaceValid(uint8_t *addr, size_t size)
{
return (bool)((addr - NSEC_MEMORY_START) <
(NSEC_MEMORY_END - NSEC_MEMORY_START)) &&
(bool)((addr + size - NSEC_MEMORY_START) <
(NSEC_MEMORY_END - NSEC_MEMORY_START));
}
static smc_service_t *smcGetService(const char *name, size_t namelen) {
registered_object_t *rop;
if (!isAddrSpaceValid((uint8_t *)name, namelen))
return NULL;
if (*(name + namelen) != '\0')
return NULL;
rop = chFactoryFindObject(name);
if (rop == NULL)
return NULL;
return (smc_service_t *)(rop->objp);
}
#if 0 /* not used yet */
static void smcReleaseService(smc_service_t *svc_handle) {
registered_object_t *rop;
rop = chFactoryFindObjectByPointer(svc_handle);
if (rop == NULL)
return;
chFactoryReleaseObject(rop); /* our ref */
chFactoryReleaseObject(rop); /* original ref */
}
#endif
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
/**
* @brief XXX Module initialization.
*
* @notapi
*/
void smcInit(void) {
chPoolObjectInit(&svcs_pool, sizeof (smc_service_t),
chCoreAllocAlignedI);
}
/**
* @brief The trusted service call entry point.
* @pre The foreign interrupts are disabled.
* @post A request is passed to the thread registered for the service.
* @post The service thread is resumed.
*
* @param[in] svc_handle the handle of the service to be invoked
* @param[in] svc_data service request data, often a reference to a more complex structure
* @param[in] svc_datalen size of the svc_data memory area
*
* @return a value defined by the service.
* @retval MSG_OK a success value.
* @retval MSG_RESET if the service is unavailable.
*
* @notapi
*/
msg_t smcEntry(smc_service_t *svc_handle, smc_params_area_t svc_data, size_t svc_datalen) {
registered_object_t *rop;
smc_service_t *svcp;
msg_t r;
asm("bkpt #0\n\t");
if (!isAddrSpaceValid(svc_data, svc_datalen))
return MSG_RESET;
if (svc_handle == SMC_HND_GET) {
svcp = smcGetService((const char *)svc_data, svc_datalen);
if (svcp == NULL)
return MSG_RESET;
return (msg_t)svcp;
}
rop = chFactoryFindObjectByPointer(svc_handle);
if (rop == NULL)
return MSG_RESET;
svc_handle->svc_data = svc_data;
svc_handle->svc_datalen = svc_datalen;
chSysLock();
chThdResumeS(&svc_handle->svct, MSG_OK);
r = chThdSuspendS(&_ns_thread);
chSysUnlock();
chFactoryReleaseObject(rop);
return r;
}
/**
* @brief Register the calling thread as a manager of the given service @p svc_name.
* @post The current thread is registered as manager for @p svc_name service.
* Only a thread will be the manager of the service @p svc_name.
*
* @param[in] svc_name the name of the service.
*
* @return a registered smc service object.
* @retval NULL if @p svc_name failed to be registered.
*
* @notapi
*/
registered_object_t *smcRegisterMeAsService(const char *svc_name)
{
registered_object_t *rop;
smc_service_t *svcp = chPoolAlloc(&svcs_pool);
rop = chFactoryRegisterObject(svc_name, svcp);
if (rop == NULL) {
chPoolFree(&svcs_pool, svcp);
return NULL;
}
return rop;
}
/**
* @brief The calling thread is a service and wait the arrival of a request.
* @post the service object is filled with the parameters of the requestor.
*
* @param[in] svcp the service object reference.
*
* @return the reason of the awakening
* @retval MSG_OK a success value.
* @retval MSG_TIMEOUT a success value.
*
* @notapi
*/
msg_t smcServiceWaitRequest(smc_service_t *svcp)
{
msg_t r;
chDbgCheck(svcp != NULL);
chSysLock();
if (_ns_thread) {
/* Ack the previous service invocation */
chThdResumeI(&_ns_thread, MSG_OK);
}
r = chThdSuspendTimeoutS(&svcp->svct, TIME_INFINITE);
chSysUnlock();
return r;
}
/** @} */
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