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UEFI: Difference between revisions
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====System discovery====
A legacy bootloader scans memory for structures like the [[EBDA]], [[SMBIOS]], and [[ACPI]] tables. It uses PIO to talk to the root [[PCI]] controller and scan the PCI bus. It is possible that redundant tables may be present in memory (for example, the [[MP_Specification|MP]] table in the SMBIOS contains information that's also present in the ACPI [[DSDT]]) and the bootloader can choose which to use.
When UEFI firmware calls a UEFI application's entry point function, it passes a "System Table" structure, which contains pointers to all of the system's ACPI tables, memory map, and other information relevant to an OS. Legacy tables (like SMBIOS) may not be present in memory.
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