How do I reserve low memory (pre OS)?

asked Mar 17, 2022 in Education by JackTerrance

Background: I need to reserve an amount of memory below 0xA0000 prior to my operating system starts. To do this I change the 0040:0013 (or 0x413) word which is the amount of low memory available in KiB. However, Windows and other operating systems use E820h/INT15h to query the memory layout and some BIOS:es doesn't reflect 0x413 changes to the E820h/INT15h BIOS function. Therefore I also have to hook the E820h function if needed. Question: Is there another (more reliable) way to reserve low memory prior to the OS? Or any other way of changing the E820h/INT15h results other than hooking INT15h (by poking EBDA perhaps?) JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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