Lines Matching +full:is +full:- +full:ram

3 # SPDX-License-Identifier: Apache-2.0
22 	  By default, this is the same as the DT_CHOSEN_Z_SRAM physical base SRAM
23 	  address from DTS, in which case RAM will be identity-mapped. Some
24 	  architectures may require RAM to be mapped in this way; they may have
25 	  just one RAM region and doing this makes linking much simpler, as
26 	  at least when the kernel boots all virtual RAM addresses are the same
28 	  this for non-pinned page frames).
30 	  Otherwise, if RAM isn't identity-mapped:
31 	  1. It is the architecture's responsibility to transition the
35 	  the kernel's address space, such as not overlapping physical RAM
36 	  regions if RAM is not identity-mapped, or the virtual and physical
38 	  double-linking of paging structures to make the instruction pointer
42 	  page tables are in use, they all have the same virtual-to-physical
50 	  if this is not the same offset from the beginning of RAM.
53 	  build-time cases, or when a physical address cannot be looked up
56 	      virt = phys + ((KERNEL_VM_BASE + KERNEL_VM_OFFSET) -
60 	  memory that is mapped at boot.
62 	  This uncommon and is only necessary if the beginning of VM and
73 	  size of the virtual region for runtime memory mappings. This is needed
74 	  for mapping driver MMIO regions, as well as special RAM mapping use-cases
79 	  will want to use a 64-bit build of Zephyr, there are no plans to
81 	  RAM size larger than the defined bounds of the virtual address space.
84 	bool "Memory region direct-map support"
87 	  This enables the direct-map support, namely the region can be 1:1
90 	  If the specific memory region is in the virtual memory space and
96 	  Note that this is for compatibility and portable apps shouldn't
106 	  This option is enabled when the CPU's memory management unit is active
107 	  and the arch_mem_map() API is available.
114 	  Size of memory pages. Varies per MMU but 4K is common. For MMUs that
122 	  is linked and the implementation of an eviction algorithm and a
127 	bool "Allow on-demand memory mappings"
131 	  When this is enabled, RAM-based memory mappings don't actually
136 	bool "Allow interrupts during page-ins/outs"
139 	  retrieved from the backing store. This is much better for system
144 	  The scheduler is still disabled during this operation.
146 	  If this option is disabled, the page fault servicing logic
156 	  paging that do not count towards free memory. This is to
165 	  e.g. number of pagefaults. This is useful for tuning eviction
168 	  Should say N in production system as this is not without cost.
183 	  Should say N in production system as this is not without cost.
192 	  Should say N in production system as this is not without cost.