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kernel: add memory domain APIs

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Add the following application-facing memory domain APIs:

k_mem_domain_init() - to initialize a memory domain
k_mem_domain_destroy() - to destroy a memory domain
k_mem_domain_add_partition() - to add a partition into a domain
k_mem_domain_remove_partition() - to remove a partition from a domain
k_mem_domain_add_thread() - to add a thread into a domain
k_mem_domain_remove_thread() - to remove a thread from a domain

A memory domain would contain some number of memory partitions.
A memory partition is a memory region (might be RAM, peripheral
registers, flash...) with specific attributes (access permission,
e.g. privileged read/write, unprivileged read-only, execute never...).
Memory partitions would be defined by set of MPU regions or MMU tables
underneath.
A thread could only belong to a single memory domain any point in time
but a memory domain could contain multiple threads.
Threads in the same memory domain would have the same access permission
to the memory partitions belong to the memory domain.

The memory domain APIs are used by unprivileged threads to share data
to the threads in the same memory and protect sensitive data from
threads outside their domain. It is not only for improving the security
but also useful for debugging (unexpected access would cause exception).

Jira: ZEP-2281

Signed-off-by: Chunlin Han <chunlin.han@linaro.org>
This commit is contained in:
Chunlin Han 2017-07-07 20:29:30 +08:00 • committed by Andrew Boie
commit e9c9702818
17 changed files with 928 additions and 15 deletions
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4
kernel/include/kernel_structs.h
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@ -177,6 +177,10 @@ static ALWAYS_INLINE void _new_thread_init(struct k_thread *thread,
thread->custom_data = NULL;
#endif
#if defined(CONFIG_USERSPACE)
thread->mem_domain_info.mem_domain = NULL;
#endif /* CONFIG_USERSPACE */
#if defined(CONFIG_THREAD_STACK_INFO)
thread->stack_info.start = (u32_t)pStack;
thread->stack_info.size = (u32_t)stackSize;