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 <kra...@redhat.com>
---
OvmfPkg/Library/PlatformInitLib/MemDetect.c | 28 +++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
index 16ecbfadc30c..ae217d0242ed 100644
--- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
+++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
@@ -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;
}
--
2.37.3
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