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/*
ChibiOS - Copyright (C) 2006..2018 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 <string.h>
#include "ch.h"
#include "chsmc.h"
/*===========================================================================*/
/* Module local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
thread_reference_t _ns_thread = NULL;
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
static thread_reference_t main_t;
static smc_service_t svcs_table[SMC_SVC_MAX_N];
static mutex_t svcs_table_mtx;
static uint32_t n_registered_services = 0;
static smc_service_t *discovery_entry = NULL;
/*===========================================================================*/
/* 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 bool isHndlValid(smc_service_t *handle)
{
if ((handle < &svcs_table[0]) || (handle >= &svcs_table[SMC_SVC_MAX_N]))
return FALSE;
if (((char *)handle - (char *)&svcs_table[0]) % sizeof svcs_table[0])
return FALSE;
return TRUE;
}
static smc_service_t *getFreeSvcsEntry(void)
{
int i;
for (i = 0; i < SMC_SVC_MAX_N; ++i) {
if (svcs_table[i].svct == NULL)
return &svcs_table[i];
}
return NULL;
}
static smc_service_t *findSvcsEntry(const char *name)
{
int i;
for (i = 0; i < SMC_SVC_MAX_N; ++i) {
if (!strncmp(svcs_table[i].svc_name, name, SMC_SVC_MAX_NAME_LEN))
return &svcs_table[i];
}
return NULL;
}
/*
* Internal discovery service.
*/
static THD_WORKING_AREA(waDiscoveryTrustService, 512);
static THD_FUNCTION(DiscoveryTrustService, arg) {
(void) arg;
msg_t m;
smc_service_t *svcp;
discovery_entry = smcRegisterMeAsService("_discovery");
if (discovery_entry == NULL)
chSysHalt("no entry available for discovery service");
m = smcServiceWaitRequest(discovery_entry, MSG_OK);
while (true) {
chDbgAssert(m == MSG_OK, "");
if (discovery_entry->svc_datalen) {
*((char *)discovery_entry->svc_data + discovery_entry->svc_datalen - 1) = '\0';
chMtxLock(&svcs_table_mtx);
svcp = findSvcsEntry((char *)discovery_entry->svc_data);
chMtxUnlock(&svcs_table_mtx);
m = smcServiceWaitRequest(discovery_entry, (msg_t)svcp);
}
}
}
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
/**
* @brief SMC Module initialization.
*
* @notapi
*/
void smcInit(void) {
int i;
main_t = chThdGetSelfX();
for (i = 0; i < SMC_SVC_MAX_N; ++i) {
svcs_table[i].svct = NULL;
svcs_table[i].register_order = 0;
}
chMtxObjectInit(&svcs_table_mtx);
/*
* Creates the discovery service thread.
*/
chThdCreateStatic(waDiscoveryTrustService, sizeof(waDiscoveryTrustService), NORMALPRIO-63,
DiscoveryTrustService, NULL);
}
/**
* @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[inout] 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 > 0 the handle of requested service.
* @retval MSG_OK default success value.
* @retval MSG_RESET if the service is unavailable.
* @retval MSG_TIMEOUT call interrupted.
*
* @notapi
*/
msg_t smcEntry(smc_service_t *svc_handle, smc_params_area_t svc_data, size_t svc_datalen) {
smc_service_t *svcp;
msg_t r;
if (!isAddrSpaceValid(svc_data, svc_datalen))
return MSG_RESET;
if (svc_handle == SMC_HND_DISCOVERY) {
svcp = discovery_entry;
if (svcp == NULL)
return MSG_RESET;
} else {
if (!isHndlValid(svc_handle))
return MSG_RESET;
svcp = svc_handle;
}
svcp->svc_data = svc_data;
svcp->svc_datalen = svc_datalen;
#if (CH_DBG_SYSTEM_STATE_CHECK == TRUE)
_dbg_check_lock();
#endif
chThdResumeS(&svcp->svct, MSG_OK);
r = chThdSuspendS(&_ns_thread);
#if (CH_DBG_SYSTEM_STATE_CHECK == TRUE)
_dbg_check_unlock();
#endif
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
*/
smc_service_t *smcRegisterMeAsService(const char *svc_name)
{
smc_service_t *svcp;
if (n_registered_services == SMC_SVC_MAX_N)
return NULL;
chMtxLock(&svcs_table_mtx);
if (findSvcsEntry(svc_name) != NULL) {
chMtxUnlock(&svcs_table_mtx);
return NULL;
}
svcp = getFreeSvcsEntry();
svcp->register_order = n_registered_services;
++n_registered_services;
strncpy(svcp->svc_name, svc_name, SMC_SVC_MAX_NAME_LEN);
chMtxUnlock(&svcs_table_mtx);
return svcp;
}
/**
* @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.
*
* @notapi
*/
msg_t smcServiceWaitRequest(smc_service_t *svcp, msg_t msg)
{
msg_t r;
chDbgCheck(svcp != NULL);
chSysLock();
if (_ns_thread) {
/* Ack the previous service invocation. Not schedule. */
chThdResumeI(&_ns_thread, msg);
}
chEvtSignalI(main_t, (1 << svcp->register_order));
r = chThdSuspendTimeoutS(&svcp->svct, TIME_INFINITE);
chSysUnlock();
return r;
}
void smcWaitServicesStarted(uint32_t n_services)
{
eventmask_t mask;
chDbgAssert(chThdGetSelfX() == main_t, "Only main thread is allowed to call this");
mask = (1 << (n_services + 1)) - 1;
chEvtWaitAll(mask);
}
/** @} */
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