Here:http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES#AllocatePages.28.29
First of all, is there a concept of Virtual Memory in UEFI ?
Why does EFI_MEMORY_DESCRIPTOR have VirtualStart ? What is it used for ?
typedef struct {
UINT32 Type;
EFI_PHYSICAL_ADDRESS PhysicalStart;
EFI_VIRTUAL_ADDRESS VirtualStart;
UINT64 NumberOfPages;
UINT64 Attribute;
} EFI_MEMORY_DESCRIPTOR; Finally, if there is no virtual memory, then why is
AllocatePages even required ? If all you care about is reading/writing to pure
physical memory addresses, then do you need to call AllocatePages ?
Thanks,
Shubha
Shubha D. [email protected]
[email protected]
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