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When the kernel been loaded into the memory, can it still can use BIOS interrupts? Such as
mov AX,0E820h
int 15h
or something.
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For example, you might see UEFI USB Drive and BIOS USB Drive. Each command uses the same device and media, but boots the PC in a different firmware mode. Some devices only support one mode (either UEFI or BIOS). Other devices will only allow you to boot to BIOS mode by manually disabling the UEFI security features.
1 Answer. Show activity on this post. If you just change from CSM/BIOS to UEFI then your computer will simply not boot. Windows does not support booting from GPT disks when in BIOS mode, meaning you must have an MBR disk, and it does not support booting from MBR disks when in UEFI mode, meaning you must have a GPT disk ...
Benefits of UEFI boot mode over Legacy BIOS boot mode include: Support for hard drive partitions larger than 2 Tbytes. Support for more than four partitions on a drive. Fast booting.
Windows 10 utilizes the Unified Extensible Firmware Interface (UEFI) to support the handoff of system control from the SoC firmware boot loader to the OS. The UEFI environment is a minimal boot OS upon which devices are booted and the Windows 10 OS runs.
A UEFI program (or an OS loaded from one) cannot use legacy interrupts; it has to use the UEFI API.
If a UEFI BIOS includes the compatibility support module (CSM), then it supports legacy interrupts when booting a legacy boot sector.
To obtain the e820 memory map, call the UEFI boot services function GetMemoryMap.
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