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OvmfPkg/PlatformInitLib: dynamic mmio window size 

In case we have a reliable PhysMemAddressWidth use that to dynamically
size the 64bit address window.  Allocate 1/8 of the physical address
space and place the window at the upper end of the address space.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Gerd Hoffmann 2022-10-04 15:47:27 +02:00 committed by mergify[bot]
parent bbda386d25
commit ecb778d0ac
1 changed files with 28 additions and 0 deletions
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28
OvmfPkg/Library/PlatformInitLib/MemDetect.c
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@ -604,6 +604,33 @@ PlatformAddressWidthFromCpuid (
}
}
VOID
EFIAPI
PlatformDynamicMmioWindow (
IN OUT EFI_HOB_PLATFORM_INFO *PlatformInfoHob
)
{
UINT64 AddrSpace, MmioSpace;
AddrSpace = LShiftU64 (1, PlatformInfoHob->PhysMemAddressWidth);
MmioSpace = LShiftU64 (1, PlatformInfoHob->PhysMemAddressWidth - 3);
if ((PlatformInfoHob->PcdPciMmio64Size < MmioSpace) &&
(PlatformInfoHob->PcdPciMmio64Base + MmioSpace < AddrSpace))
{
DEBUG ((DEBUG_INFO, "%a: using dynamic mmio window\n", __func__));
DEBUG ((DEBUG_INFO, "%a: Addr Space 0x%Lx (%Ld GB)\n", __func__, AddrSpace, RShiftU64 (AddrSpace, 30)));
DEBUG ((DEBUG_INFO, "%a: MMIO Space 0x%Lx (%Ld GB)\n", __func__, MmioSpace, RShiftU64 (MmioSpace, 30)));
PlatformInfoHob->PcdPciMmio64Size = MmioSpace;
PlatformInfoHob->PcdPciMmio64Base = AddrSpace - MmioSpace;
} else {
DEBUG ((DEBUG_INFO, "%a: using classic mmio window\n", __func__));
}
DEBUG ((DEBUG_INFO, "%a: Pci64 Base 0x%Lx\n", __func__, PlatformInfoHob->PcdPciMmio64Base));
DEBUG ((DEBUG_INFO, "%a: Pci64 Size 0x%Lx\n", __func__, PlatformInfoHob->PcdPciMmio64Size));
}
/**
Iterate over the PCI host bridges resources information optionally provided
in fw-cfg and find the highest address contained in the PCI MMIO windows. If
@ -765,6 +792,7 @@ PlatformAddressWidthInitialization (
if (PlatformInfoHob->PhysMemAddressWidth != 0) {
// physical address width is known
PlatformInfoHob->FirstNonAddress = FirstNonAddress;
PlatformDynamicMmioWindow (PlatformInfoHob);
return;
}