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userspace: add support for dynamic kernel objects

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A red-black tree is maintained containing the metadata for all
dynamically created kernel objects, which are allocated out of the
system heap.

Currently, k_object_alloc() and k_object_free() are supervisor-only.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-11-08 16:38:03 -08:00 • committed by Andrew Boie
commit 31bdfc014e
7 changed files with 254 additions and 3 deletions
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29
include/kernel.h
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@ -299,6 +299,35 @@ __syscall void k_object_access_revoke(void *object, struct k_thread *thread);
*/
void k_object_access_all_grant(void *object);
#ifdef CONFIG_DYNAMIC_OBJECTS
/**
* Allocate a kernel object of a designated type
*
* This will instantiate at runtime a kernel object of the specified type,
* returning a pointer to it. The object will be returned in an uninitialized
* state, with the calling thread being granted permission on it. The memory
* for the object will be allocated out of the kernel's heap.
*
* Currently, allocation of thread stacks is not supported.
*
* @param otype Requested kernel object type
* @return A pointer to the allocated kernel object, or NULL if memory wasn't
* available
*/
void *k_object_alloc(enum k_objects otype);
/**
* Free a kernel object previously allocated with k_object_alloc()
*
* This will return memory for a kernel object back to the system heap.
* Care must be exercised that the object will not be used during or after
* when this call is made.
*
* @param obj Pointer to the kernel object memory address.
*/
void k_object_free(void *obj);
#endif /* CONFIG_DYNAMIC_OBJECTS */
/* Using typedef deliberately here, this is quite intended to be an opaque
* type. K_THREAD_STACK_BUFFER() should be used to access the data within.
*