Does kernel use physical address?

Yes, kernel mode code uses virtual address space. The kernel manages physical address space but it doesn’t run in physical address space.

What is the difference between a real address and a virtual address?

Physical addresses refer to hardware addresses of physical memory. Virtual addresses refer to the virtual store viewed by the process. might be different, in which case virtual addresses must be mapped into physical addresses. Mapping is done by Memory Management Unit (MMU).

What is my physical address?

A Physical Address is a real street address that you can use for business or personal use. Because Physical Addresses are real street addresses, not a PO Box, you can register your business and receive packages from any carrier, including FedEx and UPS.

What is the difference between physical address and mailing address?

The key difference between a mailing address and a physical address is that a physical address is where the physical company is situated, whereas a mailing address is where a business has post delivered but doesn’t necessarily operate from.

At what virtual address is the kernel loaded?

Thus the kernel has only one relevant segment that is loaded at physical address of 1MB (0x100000) and virtual address of KERNBASE + 1MB (0x80100000). KERNBASE is the starting address of the kernel’s address space (0x80000000 or 2GB in xv6).

Does kernel use virtual memory?

Yes, the Linux kernel uses virtual memory just as user-space processes use virtual memory. That virtual memory is special in some ways—the kernel controls it, after all—but it is virtual, not physical.

What do you mean by physical address?

A physical address is a real street address that can be used as a personal or business mailing address. Unlike a PO Box, a physical address can receive unrestricted mail and parcels from carriers other than USPS, such as UPS, FedEx, DHL, and Amazon.