online mmu

the size of the 4096*1024,32-bit virtual address corresponding to the 32-bit IPV4 address, this is not the case? However, the Level two page table or multi-level page table solves the problem of sparse address, if it is a first-level page table, then there will be a lot of "holes", this is because the process how to arrange virtual address in the kernel and the MMU seems to be out of control. And for the problems we are encountering, the use of simil

MMU Paging principle The paging mechanism of modern processing is often very complex, especially the first impression is particularly complicated. In order to support the flexible and efficient management of memory by the operating system, the paging mechanism seems to be quite complex, however, its essential algorithm is quite concise and clear. According to my understanding, from the memory paging mechanism of the junior high school to the realit

MMU needs to be used at a cost, which is reflected in memory, system power consumption, and development complexity. Let me take a look at the memory cost. The arm system can have two virtual address segmentation methods: two segments and three segments. The split of two segments uses 1 MB as the page (also called Section). In the split of three segments, the page size can be 1 kb, 4 kb, and 64 KB. We will discuss it in 4kb. During the 4 kb address

From failure of designing a route table in a simulated MMU to DxR RegressionIn a text written a few days ago, I described a failed experience. If I care about the process, it is a success. However, I have to roll back to DxR and study its nature rather than its algorithm ideas. The reason for my failure is that my reverse psychology is at odds. I did not really study the nature of DxR and started to do it. It is no doubt that I have no preparation and

:. Word not_used_IRQ:. Word IRQ_fiq:. Word Fiqundefined_instruction: NOP Software_interrupt: NOPPrefetch_abort: NOP Data_abort: NOP not_used: NOP IRQ: NOP Fiq: NOPReset:bl set_svc bl disable_watchdog bl diasble_interrupt bl Disable_mmumovpc, LRset_svc:Mrs R0, CPSR Bic r0, R0, #0x1f Orr r0, R0, #0xd3 msr cpsr, R0movpc, Lr#define pwtcon 0x53000000Disable_watchdog:Ldr R0, =pwtconmovR1, #0x0StrR1, [R0]movpc, Lrdisable_interrupt mvn R1, #0x0 ldr r0, =0x4a000008StrR

Attention:Some operations may not cause the hardware to automatically perform contextual synchronization. For example, when we pass the tlbwe directiveWhen updating the Utlb page table, the hardware does not automatically perform contextual synchronization, that is, the shadow register is not automatically invalidatedCache (if there is a page table in the shadow cache that has already been invalidated, if there is a newMay cause an unknown problem); If you want to make the update

In the Platform header files # Ifdef config_enable_mmu# Define pai_to_phys (x) pai_to_phy_smdkc110 (X)# Else# Define pai_to_phys (x) (X)# Endif What is the conversion from a virtual address to a physical address? In the do_movi function If (ADDR> = 0xc0000000)ADDR = pai_to_phys (ADDR ); The do_bootm function also has ADDR = pai_to_phys (ADDR ); Slave This definition # Ifdef config_enable_mmu# Define pai_to_phys (x) pai_to_phy_smdkc110 (X)# Else# Define pai_to_phys (x) (X)# E

that the 16 consecutive entries in the thick page table hold the same large page descriptor.2.4 consecutive entries in a thin page table save the same small page descriptorMVA[19:10] For a fine-page table index] has coincident bits for mva[11:0] that are used for small-page addressing, and the descriptor saved in the Rough page table [31:12] as the base address of the physical addresses, in order to guarantee the same base, change the address, that is, the descriptor unchanged, mva[11:0] change

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