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OvmfPkg: PlatformPei: factor out GetFirstNonAddress() 

Factor out the expression that is currently the basis of the address width
calculation into a standalone function. In the next patches we'll raise
the return value under certain circumstances.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>
Cc: Thomas Lamprecht <t.lamprecht@proxmox.com>
Ref: https://github.com/tianocore/edk2/issues/59
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Laszlo Ersek 2016-03-04 17:23:35 +01:00
parent 8f35eb92c4
commit d537168063
1 changed files with 17 additions and 1 deletions
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18
OvmfPkg/PlatformPei/MemDetect.c
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@ -87,6 +87,22 @@ GetSystemMemorySizeAbove4gb (
}
/**
Return the highest address that DXE could possibly use, plus one.
**/
STATIC
UINT64
GetFirstNonAddress (
VOID
)
{
UINT64 FirstNonAddress;
FirstNonAddress = BASE_4GB + GetSystemMemorySizeAbove4gb ();
return FirstNonAddress;
}
/**
Initialize the mPhysMemAddressWidth variable, based on guest RAM size.
**/
@ -103,7 +119,7 @@ AddressWidthInitialization (
// The DXL IPL keys off of the physical address bits advertized in the CPU
// HOB. To conserve memory, we calculate the minimum address width here.
//
FirstNonAddress = BASE_4GB + GetSystemMemorySizeAbove4gb ();
FirstNonAddress = GetFirstNonAddress ();
mPhysMemAddressWidth = (UINT8)HighBitSet64 (FirstNonAddress);
//