1.27.10 1.28.11 ARM MMU V7A
The MMU works with the L1 and L2 memory system to translate virtual addresses to physical addresses. It also controls accesses to and from external memory. The ARM v7 Virtual Memory System Architecture (VMSA) features include the following:
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Page table entries that support:
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16 Mbyte supersections. The processor supports supersections that consist of 16 Mbyte blocks of memory.
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1 Mbyte sections
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64 Kbyte large pages
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4 Kbyte small pages
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16 access domains
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Global and application-specific identifiers to remove the requirement for context switch TLB flushes.
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Extended permissions checking capability.
TLB maintenance and configuration operations are controlled through a dedicated coprocessor, CP15, integrated with the core. This coprocessor provides a standard mechanism for configuring the L1 memory system.
Using The Library
This Plib Initializes MMU with a flat address map (e.g. physical and virtual addresses are the same) and enable MMU and caches by invoking MMU_Initialize() in the system initialization.
Library Interface
ARM MMU V7A peripheral library provides the following interfaces:
Functions
Name | Description |
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MMU_Initialize | Initialize and enable MMU |
icache_InvalidateAll | Invalidate instruction cache |
icache_Enable | Enable instruction cache |
icache_Disable | Disable instruction cache |
dcache_InvalidateAll | Invalidate Data Cache |
dcache_CleanAll | Clean Data Cache |
dcache_CleanInvalidateAll | Clean and Invalidate Data Cache |
dcache_InvalidateByAddr | Invalidate Data Cache by address |
dcache_CleanByAddr | Clean Data Cache by address |
dcache_CleanInvalidateByAddr | Clean Data Cache by address |
dcache_Enable | Enable data cache |
dcache_Disable | Disable data cache |