Why is the knowledge about computer CPU not decrypted?

Integrated circuit is a highly transparent industry. Anyone who can apply for a patent must apply for patent disclosure, one is protection and the other is sales! The business model that this industry makes money by selling patent licenses (IP cores) is more common than any other industry.

"Famous CPU international manufacturers" are divided into two categories according to the types of instruction sets, x86 camp and ARM camp.

For the x86 camp, it can be cracked and copied through reverse engineering, but due to patent restrictions, it cannot be sold commercially. Even the forward design, as long as the instruction set is compatible, constitutes patent infringement and cannot be sold. History determines that only Intel and AMD are meaningful commercial manufacturers. What will the result bring? Both sides can understand and crack opponents best, so anyone who can crack and confirm that they have been cracked should apply for patent protection, otherwise being cracked is equivalent to eating dumb losses. As for domestic enterprises, since they are not allowed to sell x86, they can only look at ready-made patents, and not many people are willing to look at them. The so-called book about decrypting x86 is actually just an application-oriented programming guide with a gimmick name, otherwise who needs to buy it?

For the ARM camp, ARM itself only sells patent licenses and does not sell products. Other manufacturers can produce by purchasing the patent licenses of ARM. The technology itself is open, but you have to pay. In addition, this CPU also needs a lot of multimedia and other auxiliary functions, and the sale of this IP core is also very common. In the ARM era, domestic CPU has been popularized everywhere (MediaTek, Huawei Hisilicon, and Juli Quan Zhi), but it is subject to patents and has low added value.

In addition, there was Godson, which was also based on the open MIPS instruction set, and some independent intellectual property rights once wanted to sell. Unfortunately, the MIPS instruction set has been killed by ARM.

Conclusion: The landlord's question is not valid. Most of the knowledge about CPU has been decrypted by the manufacturer himself when applying for a patent, but the landlord didn't see it and wanted to crack and copy it.

Finally, spit out the initiator of this problem: the old computer architecture education. Now it is 2 1 century, and many schools are still talking about the principle of 16-bit microcomputer based on 8086.