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OvmfPkg/PlatformInitLib: simplify mtrr setup 

With the new mmconfig location at 0xe0000000 above the 32-bit PCI MMIO
window we don't have to special-case the mmconfig xbar any more.  We'll
just add a mtrr uncachable entry starting at MMIO window base and ending
at 4GB.

Update comments to match reality.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Gerd Hoffmann 2023-03-28 09:34:02 +02:00 committed by mergify[bot]
parent 82c1aa87f9
commit e4b3fd905a
1 changed files with 15 additions and 21 deletions
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36
OvmfPkg/Library/PlatformInitLib/MemDetect.c
View File

@ -61,33 +61,20 @@ PlatformQemuUc32BaseInitialization (
return;
}
ASSERT (
PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID ||
PlatformInfoHob->HostBridgeDevId == INTEL_82441_DEVICE_ID
);
PlatformGetSystemMemorySizeBelow4gb (PlatformInfoHob);
if (PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
ASSERT (PcdGet64 (PcdPciExpressBaseAddress) <= MAX_UINT32);
ASSERT (PcdGet64 (PcdPciExpressBaseAddress) >= PlatformInfoHob->LowMemory);
if (PlatformInfoHob->LowMemory <= BASE_2GB) {
// Newer qemu with gigabyte aligned memory,
// 32-bit pci mmio window is 2G -> 4G then.
PlatformInfoHob->Uc32Base = BASE_2GB;
} else {
//
// On q35, the 32-bit area that we'll mark as UC, through variable MTRRs,
// starts at PcdPciExpressBaseAddress. The platform DSC is responsible for
// setting PcdPciExpressBaseAddress such that describing the
// [PcdPciExpressBaseAddress, 4GB) range require a very small number of
// variable MTRRs (preferably 1 or 2).
//
PlatformInfoHob->Uc32Base = (UINT32)PcdGet64 (PcdPciExpressBaseAddress);
}
return;
}
ASSERT (PlatformInfoHob->HostBridgeDevId == INTEL_82441_DEVICE_ID);
//
// On i440fx, start with the [LowerMemorySize, 4GB) range. Make sure one
// Start with the [LowerMemorySize, 4GB) range. Make sure one
// variable MTRR suffices by truncating the size to a whole power of two,
// while keeping the end affixed to 4GB. This will round the base up.
//
@ -1027,6 +1014,13 @@ PlatformQemuInitializeRam (
// practically any alignment, and we may not have enough variable MTRRs to
// cover it exactly.
//
// Because of that PlatformQemuUc32BaseInitialization() will round
// up PlatformInfoHob->LowMemory to make sure a single mtrr register
// is enough. The the result will be stored in
// PlatformInfoHob->Uc32Base. On a typical qemu configuration with
// gigabyte-alignment being used LowMemory will be 2 or 3 GB and no
// rounding is needed, so LowMemory and Uc32Base will be identical.
//
if (IsMtrrSupported () && (PlatformInfoHob->HostBridgeDevId != CLOUDHV_DEVICE_ID)) {
MtrrGetAllMtrrs (&MtrrSettings);
@ -1056,8 +1050,8 @@ PlatformQemuInitializeRam (
ASSERT_EFI_ERROR (Status);
//
// Set the memory range from the start of the 32-bit MMIO area (32-bit PCI
// MMIO aperture on i440fx, PCIEXBAR on q35) to 4GB as uncacheable.
// Set the memory range from the start of the 32-bit PCI MMIO
// aperture to 4GB as uncacheable.
//
Status = MtrrSetMemoryAttribute (
PlatformInfoHob->Uc32Base,