umm_malloc

Function init

Source 
pub unsafe fn init()
Expand description

Initializes the heap from extern addresses

This function initializes the heap using the address defined by the extern pointer UMM_MALLOC_CFG_HEAP_ADDR with size defined by the extern u32 UMM_MALLOC_CFG_HEAP_ADDR. You must define symbols with those (unmangled) names elsewhere, e.g. in your linker script.

See umm_malloc::init_heap() for runtime initialization.

§Note

  • The heap grows “upwards”, towards larger addresses. Thus end_addr must be larger than start_addr.
  • The size of the heap is (end_addr as usize) - (start_addr as usize). The allocator won’t use the byte at end_addr.

§Safety

Obey these or Bad Stuff will happen.

  • This function must be called exactly ONCE.
  • This function must be called BEFORE you run any code that makes use of the allocator unless the cargo feature init-if-uninitialized or hang-if-uninitialized is enabled.