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During DXE, drivers save data in the LockBox. A save operation is layered as follows: - The unprivileged driver wishing to store data in the LockBox links against the "MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxDxeLib.inf" library instance. The library allows the unprivileged driver to format requests for the privileged SMM LockBox driver (see below), and to parse responses. We apply this resolution for DXE_DRIVER modules. - The privileged SMM LockBox driver is built from "MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf". This driver has module type DXE_SMM_DRIVER and can access SMRAM. The driver delegates command parsing and response formatting to "MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf". Therefore we include this DXE_SMM_DRIVER in the build, and apply said resolution specifically to it. (Including the driver requires us to resolve a few of other library classes for DXE_SMM_DRIVER modules.) - In PEI, the S3 Resume PEIM (UefiCpuPkg/Universal/Acpi/S3Resume2Pei) retrieves data from the LockBox. It is capable of searching SMRAM itself. We resolve LockBoxLib to "MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxPeiLib.inf" specifically for this one PEIM. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19048 6f19259b-4bc3-4df7-8a09-765794883524