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Added description of tz_module and MBED_TZ_DEFAULT_ACCESS

pull/6486/head
deepikabhavnani 2018-04-04 12:28:57 -05:00
parent ceb44f9cb1
commit 48002ffc39
2 changed files with 15 additions and 8 deletions
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4
rtos/Thread.cpp
View File

@ -43,6 +43,10 @@ extern "C" void thread_terminate_hook(osThreadId_t id)
namespace rtos {
#ifndef MBED_TZ_DEFAULT_ACCESS
#define MBED_TZ_DEFAULT_ACCESS 0
#endif
void Thread::constructor(uint32_t tz_module, osPriority priority,
uint32_t stack_size, unsigned char *stack_mem, const char *name) {

19
rtos/Thread.h
View File

@ -72,16 +72,16 @@ namespace rtos {
* Memory considerations: The thread control structures will be created on current thread's stack, both for the mbed OS
* and underlying RTOS objects (static or dynamic RTOS memory pools are not being used).
* Additionally the stack memory for this thread will be allocated on the heap, if it wasn't supplied to the constructor.
*
* @note
* MBED_TZ_DEFAULT_ACCESS (default:0) flag can be used to change the default access of all user threads in non-secure mode.
* MBED_TZ_DEFAULT_ACCESS set to 1, means all non-secure user threads have access to call secure functions.
* MBED_TZ_DEFAULT_ACCESS set to 0, means none of the non-secure user thread have access to call secure functions,
* to give access to particular thread used overloaded constructor with `tz_module` as argument during thread creation.
*
* MBED_TZ_DEFAULT_ACCESS is target specific define, should be set in targets.json file for Cortex-M23/M33 devices.
*/
/* This flag can be used to change the default access of all threads in non-secure mode.
MBED_TZ_DEFAULT_ACCESS set to 1, means all non-secure threads have access to call secure functions.
MBED_TZ_DEFAULT_ACCESS is target specific define, should be set in targets.json file for Cortex-M23/M33 devices.
*/
#ifndef MBED_TZ_DEFAULT_ACCESS
#define MBED_TZ_DEFAULT_ACCESS 0
#endif
class Thread : private mbed::NonCopyable<Thread> {
public:
/** Allocate a new thread without starting execution
@ -102,6 +102,9 @@ public:
/** Allocate a new thread without starting execution
@param tz_module trustzone thread identifier (osThreadAttr_t::tz_module)
Context of RTOS threads in non-secure state must be saved when calling secure functions.
tz_module ID is used to allocate context memory for threads, and it can be safely set to zero for
threads not using secure calls at all. See "TrustZone RTOS Context Management" for more details.
@param priority initial priority of the thread function. (default: osPriorityNormal).
@param stack_size stack size (in bytes) requirements for the thread function. (default: OS_STACK_SIZE).
@param stack_mem pointer to the stack area to be used by this thread (default: NULL).