diff options
Diffstat (limited to 'OvmfPkg/LoongArchVirt/PlatformPei/MemDetect.c')
| -rw-r--r-- | OvmfPkg/LoongArchVirt/PlatformPei/MemDetect.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/OvmfPkg/LoongArchVirt/PlatformPei/MemDetect.c b/OvmfPkg/LoongArchVirt/PlatformPei/MemDetect.c new file mode 100644 index 0000000..b2f7c7e --- /dev/null +++ b/OvmfPkg/LoongArchVirt/PlatformPei/MemDetect.c @@ -0,0 +1,237 @@ +/** @file
+ Memory Detection for Virtual Machines.
+
+ Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+//
+// The package level header files this module uses
+//
+#include <PiPei.h>
+
+//
+// The Library classes this module consumes
+//
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Library/QemuFwCfgLib.h>
+#include <Library/ResourcePublicationLib.h>
+#include <Register/LoongArch64/Csr.h>
+#include <Uefi/UefiSpec.h>
+#include "Platform.h"
+
+#define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS (128)
+#define LOONGARCH_FW_RAM_TOP BASE_256MB
+
+/**
+ Publish PEI core memory
+
+ @return EFI_SUCCESS The PEIM initialized successfully.
+**/
+EFI_STATUS
+PublishPeiMemory (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ UINT64 Base;
+ UINT64 Size;
+ UINT64 RamTop;
+ FIRMWARE_CONFIG_ITEM FwCfgItem;
+ UINTN FwCfgSize;
+ UINTN Processed;
+ MEMMAP_ENTRY MemoryMapEntry;
+
+ //
+ // Determine the range of memory to use during PEI
+ //
+ Base = FixedPcdGet64 (PcdOvmfSecPeiTempRamBase) + FixedPcdGet32 (PcdOvmfSecPeiTempRamSize);
+ RamTop = 0;
+
+ Status = QemuFwCfgFindFile ("etc/memmap", &FwCfgItem, &FwCfgSize);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ if (FwCfgSize % sizeof MemoryMapEntry != 0) {
+ return EFI_PROTOCOL_ERROR;
+ }
+
+ QemuFwCfgSelectItem (FwCfgItem);
+ for (Processed = 0; Processed < FwCfgSize; Processed += sizeof MemoryMapEntry) {
+ QemuFwCfgReadBytes (sizeof MemoryMapEntry, &MemoryMapEntry);
+ if (MemoryMapEntry.Type != EfiAcpiAddressRangeMemory) {
+ continue;
+ }
+
+ //
+ // Find memory map entry where PEI temp stack is located
+ //
+ if ((MemoryMapEntry.BaseAddr <= Base) &&
+ (Base < (MemoryMapEntry.BaseAddr + MemoryMapEntry.Length)))
+ {
+ RamTop = MemoryMapEntry.BaseAddr + MemoryMapEntry.Length;
+ break;
+ }
+ }
+
+ if (RamTop == 0) {
+ DEBUG ((DEBUG_ERROR, "ERROR: No memory map entry contains temp stack \n"));
+ ASSERT (FALSE);
+ }
+
+ Size = RamTop - Base;
+
+ //
+ // Publish this memory to the PEI Core
+ //
+ Status = PublishSystemMemory (Base, Size);
+ ASSERT_EFI_ERROR (Status);
+
+ DEBUG ((DEBUG_INFO, "Publish Memory Initialize done.\n"));
+ return Status;
+}
+
+/**
+ Peform Memory Detection
+ Publish system RAM and reserve memory regions
+**/
+VOID
+InitializeRamRegions (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ FIRMWARE_CONFIG_ITEM FwCfgItem;
+ UINTN FwCfgSize;
+ MEMMAP_ENTRY MemoryMapEntry;
+ MEMMAP_ENTRY *StartEntry;
+ MEMMAP_ENTRY *pEntry;
+ UINTN Processed;
+
+ Status = QemuFwCfgFindFile ("etc/memmap", &FwCfgItem, &FwCfgSize);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "%a %d read etc/memmap error Status %d \n", __func__, __LINE__, Status));
+ return;
+ }
+
+ if (FwCfgSize % sizeof MemoryMapEntry != 0) {
+ DEBUG ((DEBUG_ERROR, "no MemoryMapEntry FwCfgSize:%d\n", FwCfgSize));
+ return;
+ }
+
+ QemuFwCfgSelectItem (FwCfgItem);
+ StartEntry = AllocatePages (EFI_SIZE_TO_PAGES (FwCfgSize));
+ QemuFwCfgReadBytes (FwCfgSize, StartEntry);
+ for (Processed = 0; Processed < (FwCfgSize / sizeof MemoryMapEntry); Processed++) {
+ pEntry = StartEntry + Processed;
+ if (pEntry->Length == 0) {
+ continue;
+ }
+
+ DEBUG ((DEBUG_INFO, "MemmapEntry Base %p length %p type %d\n", pEntry->BaseAddr, pEntry->Length, pEntry->Type));
+ if (pEntry->Type != EfiAcpiAddressRangeMemory) {
+ continue;
+ }
+
+ AddMemoryRangeHob (pEntry->BaseAddr, pEntry->BaseAddr + pEntry->Length);
+ }
+
+ //
+ // When 0 address protection is enabled,
+ // 0-4k memory needs to be preallocated to prevent UEFI applications from allocating use,
+ // such as grub
+ //
+ if (PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT0) {
+ BuildMemoryAllocationHob (
+ 0,
+ EFI_PAGE_SIZE,
+ EfiBootServicesData
+ );
+ }
+}
+
+/**
+ Gets the Virtual Memory Map of corresponding platforms.
+
+ This Virtual Memory Map is used by initialize the MMU on corresponding
+ platforms.
+
+ @param[out] MemoryTable Array of EFI_MEMORY_DESCRIPTOR
+ describing a Physical-to-Virtual Memory
+ mapping. This array must be ended by a
+ zero-filled entry. The allocated memory
+ will not be freed.
+**/
+VOID
+EFIAPI
+GetMemoryMapPolicy (
+ OUT EFI_MEMORY_DESCRIPTOR **MemoryTable
+ )
+{
+ EFI_STATUS Status;
+ FIRMWARE_CONFIG_ITEM FwCfgItem;
+ UINTN FwCfgSize;
+ MEMMAP_ENTRY MemoryMapEntry;
+ MEMMAP_ENTRY *StartEntry;
+ MEMMAP_ENTRY *pEntry;
+ UINTN Processed;
+ EFI_MEMORY_DESCRIPTOR *VirtualMemoryTable;
+ UINTN Index = 0;
+
+ ASSERT (MemoryTable != NULL);
+
+ VirtualMemoryTable = AllocatePool (
+ sizeof (EFI_MEMORY_DESCRIPTOR) *
+ MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS
+ );
+
+ //
+ // Add the 0x10000000-0x20000000. In the virtual machine, this area use for CPU UART, flash, PIC etc.
+ //
+ VirtualMemoryTable[Index].PhysicalStart = BASE_256MB;
+ VirtualMemoryTable[Index].VirtualStart = VirtualMemoryTable[Index].PhysicalStart;
+ VirtualMemoryTable[Index].NumberOfPages = EFI_SIZE_TO_PAGES (SIZE_256MB);
+ VirtualMemoryTable[Index].Attribute = EFI_MEMORY_UC;
+ ++Index;
+
+ Status = QemuFwCfgFindFile ("etc/memmap", &FwCfgItem, &FwCfgSize);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "%a %d read etc/memmap error Status %d \n", __func__, __LINE__, Status));
+ ZeroMem (&VirtualMemoryTable[Index], sizeof (EFI_MEMORY_DESCRIPTOR));
+ *MemoryTable = VirtualMemoryTable;
+ return;
+ }
+
+ if (FwCfgSize % sizeof MemoryMapEntry != 0) {
+ DEBUG ((DEBUG_ERROR, "no MemoryMapEntry FwCfgSize:%d\n", FwCfgSize));
+ }
+
+ QemuFwCfgSelectItem (FwCfgItem);
+ StartEntry = AllocatePages (EFI_SIZE_TO_PAGES (FwCfgSize));
+ QemuFwCfgReadBytes (FwCfgSize, StartEntry);
+ for (Processed = 0; Processed < (FwCfgSize / sizeof MemoryMapEntry); Processed++) {
+ pEntry = StartEntry + Processed;
+ if (pEntry->Length == 0) {
+ continue;
+ }
+
+ DEBUG ((DEBUG_INFO, "MemmapEntry Base %p length %p type %d\n", pEntry->BaseAddr, pEntry->Length, pEntry->Type));
+ VirtualMemoryTable[Index].PhysicalStart = pEntry->BaseAddr;
+ VirtualMemoryTable[Index].VirtualStart = VirtualMemoryTable[Index].PhysicalStart;
+ VirtualMemoryTable[Index].NumberOfPages = EFI_SIZE_TO_PAGES (pEntry->Length);
+ VirtualMemoryTable[Index].Attribute = EFI_MEMORY_WB;
+ ++Index;
+ }
+
+ FreePages (StartEntry, EFI_SIZE_TO_PAGES (FwCfgSize));
+ // End of Table
+ ZeroMem (&VirtualMemoryTable[Index], sizeof (EFI_MEMORY_DESCRIPTOR));
+ *MemoryTable = VirtualMemoryTable;
+}
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