In simple terms, a virtual address space is a collection of virtual addresses. They are used to connect computers and to communicate. These addresses can be assigned to different devices and services. If you have more than one device connected to the same computer network, you can create a virtual address space for all of them. However, this space is limited and you may only have a few virtual addresses.
Logical address
Virtual address and logical address are two types of addresses. They are similar in the sense that they both map to a physical address, but differ from one another in that they differ in terms of conversion. In general, a logical address corresponds to the hardware page memory before being converted to an address.
A logical address is a sequence of digits that represent a specific address on a computer. It ranges from 0 to maximum and is generated by a user program. The CPU then combines it with the base address to form a physical address. The logical address is a 32-bit unsigned integer that can represent addresses of up to 4GB. By contrast, a linear address is a string of hexadecimal numbers ranging from 0x00000000 to 0x00000000.
Unlike a logical address, a physical address is a definite location in a computer’s main memory. The physical address cannot be directly accessed by user programs. The physical address must be mapped to a logical address by the Memory Management Unit (MMU). This mapping process is called the “physical address space” and is necessary to access the logical address.
Physical addresses and logical addresses are different because physical addresses are hard to read. The former is stored in a memory, while the latter is used as a reference for physical access. The logical address, on the other hand, is generated by the CPU and refers to a physical location. The latter is the one that is accessible by a user.
The logical address contains the information that the CPU needs to perform operations. This information is used to allocate memory space. The logical address is also used as a reference to a data structure. In general, the logical address will be longer than the physical address. For example, a virtual address of 0x80495b0 has three segments, whereas the latter has no pattern.
Virtual address and logical address are both important to a computer’s memory. While they are often used interchangeably, they are not equivalent. For example, a virtual address in a virtual memory system can point to memory content stored on a disk, but it may refer to data stored in a main memory.
In contrast, physical addresses are used between a processor and memory, where data is stored. Physical addresses are typically 32-bit quantities, although larger ones may be used in some cases. This type of address is a better choice when there is a need for larger physical addresses. However, this is not the only difference between physical and logical addresses.
Usually, a physical address is assigned to a logical address. If the physical address of a page doesn’t match that of the logical address, the page directory will not be able to find it. This is because each page directory has its own unique address. This page directory is stored in the cr3 register of the CPU. To run a process, the page directory address must be placed in the cr3 register.