OS makes the call. Firmware does the fix-ups.
>From chapter 7.4 of the UEFI 2.4 spec The SetVirtualAddressMap() function is used by the OS loader. The function can only be called at runtime, and is called by the owner of the system's memory map: i.e., the component which called ExitBootServices(). What this means is that the OS provides a mapping into the OS's kernel virtual address space. The UEFI Runtime firmware fixes up its code and data to run at the address passed by the OS via the call above. Details of the firmware's role https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Library/UefiRuntimeLib Vincent From: stanley.ganyezu [mailto:stanley.gany...@gmail.com] Sent: Tuesday, July 23, 2013 4:27 PM To: edk2-devel@lists.sourceforge.net Subject: [edk2] runtime service address translation Importance: High Hi Everyone, When OS boots, it call some BIOS runtime services. In runtime services, bios take care of the Virtual to Physical address mapping or OS? And how? Thanks. Best wishes, Stanley
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