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SubjectRE: For comment: draft BIOS use document for the kernel

> If the E820 call fails then the INT 15 AX=0xE801 service is called and the
> results are sanity checked. In particular the code zeroes the CX/DX return
> values in order to detect BIOS implementations that do not set them
> usable memory data. It also handles older BIOSes that return AX/BX but not
> AX/BX data.
/set them usable/set the usable/
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