diff options
Diffstat (limited to 'OvmfPkg/XenAcpiPlatformDxe/PciDecoding.c')
| -rw-r--r-- | OvmfPkg/XenAcpiPlatformDxe/PciDecoding.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/OvmfPkg/XenAcpiPlatformDxe/PciDecoding.c b/OvmfPkg/XenAcpiPlatformDxe/PciDecoding.c deleted file mode 100644 index 00fc57eb13..0000000000 --- a/OvmfPkg/XenAcpiPlatformDxe/PciDecoding.c +++ /dev/null @@ -1,194 +0,0 @@ -/** @file
- Temporarily enable IO and MMIO decoding for all PCI devices while QEMU
- regenerates the ACPI tables.
-
- Copyright (C) 2016-2021, Red Hat, Inc.
-
- SPDX-License-Identifier: BSD-2-Clause-Patent
-**/
-
-#include <Library/DebugLib.h> // DEBUG()
-#include <Library/MemoryAllocationLib.h> // AllocatePool()
-#include <Library/UefiBootServicesTableLib.h> // gBS
-
-#include "AcpiPlatform.h"
-
-
-/**
- Collect all PciIo protocol instances in the system. Save their original
- attributes, and enable IO and MMIO decoding for each.
-
- This is a best effort function; it doesn't return status codes. Its
- caller is supposed to proceed even if this function fails.
-
- @param[out] OriginalAttributes On output, a dynamically allocated array of
- ORIGINAL_ATTRIBUTES elements. The array lists
- the PciIo protocol instances found in the
- system at the time of the call, plus the
- original PCI attributes for each.
-
- Before returning, the function enables IO and
- MMIO decoding for each PciIo instance it
- finds.
-
- On error, or when no such instances are
- found, OriginalAttributes is set to NULL.
-
- @param[out] Count On output, the number of elements in
- OriginalAttributes. On error it is set to
- zero.
-**/
-VOID
-EnablePciDecoding (
- OUT ORIGINAL_ATTRIBUTES **OriginalAttributes,
- OUT UINTN *Count
- )
-{
- EFI_STATUS Status;
- UINTN NoHandles;
- EFI_HANDLE *Handles;
- ORIGINAL_ATTRIBUTES *OrigAttrs;
- UINTN Idx;
-
- *OriginalAttributes = NULL;
- *Count = 0;
-
- if (PcdGetBool (PcdPciDisableBusEnumeration)) {
- //
- // The platform downloads ACPI tables from QEMU in general, but there are
- // no root bridges in this execution. We're done.
- //
- return;
- }
-
- Status = gBS->LocateHandleBuffer (ByProtocol, &gEfiPciIoProtocolGuid,
- NULL /* SearchKey */, &NoHandles, &Handles);
- if (Status == EFI_NOT_FOUND) {
- //
- // No PCI devices were found on either of the root bridges. We're done.
- //
- return;
- }
-
- if (EFI_ERROR (Status)) {
- DEBUG ((DEBUG_WARN, "%a: LocateHandleBuffer(): %r\n", __FUNCTION__,
- Status));
- return;
- }
-
- OrigAttrs = AllocatePool (NoHandles * sizeof *OrigAttrs);
- if (OrigAttrs == NULL) {
- DEBUG ((DEBUG_WARN, "%a: AllocatePool(): out of resources\n",
- __FUNCTION__));
- goto FreeHandles;
- }
-
- for (Idx = 0; Idx < NoHandles; ++Idx) {
- EFI_PCI_IO_PROTOCOL *PciIo;
- UINT64 Attributes;
-
- //
- // Look up PciIo on the handle and stash it
- //
- Status = gBS->HandleProtocol (Handles[Idx], &gEfiPciIoProtocolGuid,
- (VOID**)&PciIo);
- ASSERT_EFI_ERROR (Status);
- OrigAttrs[Idx].PciIo = PciIo;
-
- //
- // Stash the current attributes
- //
- Status = PciIo->Attributes (PciIo, EfiPciIoAttributeOperationGet, 0,
- &OrigAttrs[Idx].PciAttributes);
- if (EFI_ERROR (Status)) {
- DEBUG ((DEBUG_WARN, "%a: EfiPciIoAttributeOperationGet: %r\n",
- __FUNCTION__, Status));
- goto RestoreAttributes;
- }
-
- //
- // Retrieve supported attributes
- //
- Status = PciIo->Attributes (PciIo, EfiPciIoAttributeOperationSupported, 0,
- &Attributes);
- if (EFI_ERROR (Status)) {
- DEBUG ((DEBUG_WARN, "%a: EfiPciIoAttributeOperationSupported: %r\n",
- __FUNCTION__, Status));
- goto RestoreAttributes;
- }
-
- //
- // Enable IO and MMIO decoding
- //
- Attributes &= EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_MEMORY;
- Status = PciIo->Attributes (PciIo, EfiPciIoAttributeOperationEnable,
- Attributes, NULL);
- if (EFI_ERROR (Status)) {
- DEBUG ((DEBUG_WARN, "%a: EfiPciIoAttributeOperationEnable: %r\n",
- __FUNCTION__, Status));
- goto RestoreAttributes;
- }
- }
-
- //
- // Success
- //
- FreePool (Handles);
- *OriginalAttributes = OrigAttrs;
- *Count = NoHandles;
- return;
-
-RestoreAttributes:
- while (Idx > 0) {
- --Idx;
- OrigAttrs[Idx].PciIo->Attributes (OrigAttrs[Idx].PciIo,
- EfiPciIoAttributeOperationSet,
- OrigAttrs[Idx].PciAttributes,
- NULL
- );
- }
- FreePool (OrigAttrs);
-
-FreeHandles:
- FreePool (Handles);
-}
-
-
-/**
- Restore the original PCI attributes saved with EnablePciDecoding().
-
- @param[in] OriginalAttributes The array allocated and populated by
- EnablePciDecoding(). This parameter may be
- NULL. If OriginalAttributes is NULL, then the
- function is a no-op; otherwise the PciIo
- attributes will be restored, and the
- OriginalAttributes array will be freed.
-
- @param[in] Count The Count value stored by EnablePciDecoding(),
- the number of elements in OriginalAttributes.
- Count may be zero if and only if
- OriginalAttributes is NULL.
-**/
-VOID
-RestorePciDecoding (
- IN ORIGINAL_ATTRIBUTES *OriginalAttributes,
- IN UINTN Count
- )
-{
- UINTN Idx;
-
- ASSERT ((OriginalAttributes == NULL) == (Count == 0));
- if (OriginalAttributes == NULL) {
- return;
- }
-
- for (Idx = 0; Idx < Count; ++Idx) {
- OriginalAttributes[Idx].PciIo->Attributes (
- OriginalAttributes[Idx].PciIo,
- EfiPciIoAttributeOperationSet,
- OriginalAttributes[Idx].PciAttributes,
- NULL
- );
- }
- FreePool (OriginalAttributes);
-}
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