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When using ACPI OpRegions to poke device registers, Linux will use the UEFI memory map to decide which memory attributes to use, and so they should not be described as cacheable memory. Since MMIO regions that don't require an OS virtual mapping at runtime don't really belong in the UEFI memory map to begin with, omit them entirely. Signed-off-by: Pete Batard <pete@akeo.ie> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/** @file
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*
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* Copyright (c) 2017-2018, Andrey Warkentin <andrey.warkentin@gmail.com>
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* Copyright (c) 2011-2015, ARM Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-2-Clause-Patent
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*
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**/
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#include <PiPei.h>
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#include <Library/ArmMmuLib.h>
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#include <Library/ArmPlatformLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Library/RPiMem.h>
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VOID
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BuildMemoryTypeInformationHob (
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VOID
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);
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STATIC
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VOID
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InitMmu (
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IN ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable
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)
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{
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RETURN_STATUS Status;
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//Note: Because we called PeiServicesInstallPeiMemory() before to call InitMmu() the MMU Page Table
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// resides in DRAM (even at the top of DRAM as it is the first permanent memory allocation)
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Status = ArmConfigureMmu (MemoryTable, NULL, NULL);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, "Error: Failed to enable MMU\n"));
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}
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}
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STATIC
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VOID
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AddBasicMemoryRegion (
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IN ARM_MEMORY_REGION_DESCRIPTOR *Desc
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)
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{
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BuildResourceDescriptorHob (
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EFI_RESOURCE_SYSTEM_MEMORY,
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EFI_RESOURCE_ATTRIBUTE_PRESENT |
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EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
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EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
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EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
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EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
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EFI_RESOURCE_ATTRIBUTE_TESTED,
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Desc->PhysicalBase,
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Desc->Length
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);
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}
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STATIC
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VOID
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AddRuntimeServicesRegion (
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IN ARM_MEMORY_REGION_DESCRIPTOR *Desc
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)
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{
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AddBasicMemoryRegion (Desc);
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BuildMemoryAllocationHob (
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Desc->PhysicalBase,
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Desc->Length,
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EfiRuntimeServicesData
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);
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}
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STATIC
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VOID
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AddUnmappedMemoryRegion (
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IN ARM_MEMORY_REGION_DESCRIPTOR *Desc
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)
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{
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// Do nothing
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}
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STATIC
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VOID
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AddReservedMemoryRegion (
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IN ARM_MEMORY_REGION_DESCRIPTOR *Desc
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)
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{
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AddBasicMemoryRegion (Desc);
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BuildMemoryAllocationHob (
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Desc->PhysicalBase,
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Desc->Length,
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EfiReservedMemoryType
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);
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}
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void (*AddRegion[]) (IN ARM_MEMORY_REGION_DESCRIPTOR *Desc) = {
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AddUnmappedMemoryRegion,
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AddBasicMemoryRegion,
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AddRuntimeServicesRegion,
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AddReservedMemoryRegion,
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};
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/*++
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Routine Description:
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Arguments:
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FileHandle - Handle of the file being invoked.
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PeiServices - Describes the list of possible PEI Services.
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Returns:
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Status - EFI_SUCCESS if the boot mode could be set
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--*/
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EFI_STATUS
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EFIAPI
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MemoryPeim (
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IN EFI_PHYSICAL_ADDRESS UefiMemoryBase,
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IN UINT64 UefiMemorySize
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)
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{
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ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable;
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RPI_MEMORY_REGION_INFO *MemoryInfo;
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UINTN Index;
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// Get Virtual Memory Map from the Platform Library
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ArmPlatformGetVirtualMemoryMap (&MemoryTable);
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// Get additional info not provided by MemoryTable
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RpiPlatformGetVirtualMemoryInfo (&MemoryInfo);
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// Register each memory region
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for (Index = 0; MemoryTable[Index].Length != 0; Index++) {
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ASSERT (MemoryInfo[Index].Type < ARRAY_SIZE (AddRegion));
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DEBUG ((DEBUG_INFO, "%s:\n"
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"\tPhysicalBase: 0x%lX\n"
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"\tVirtualBase: 0x%lX\n"
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"\tLength: 0x%lX\n",
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MemoryInfo[Index].Name,
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MemoryTable[Index].PhysicalBase,
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MemoryTable[Index].VirtualBase,
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MemoryTable[Index].Length));
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AddRegion[MemoryInfo[Index].Type] (&MemoryTable[Index]);
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}
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// Build Memory Allocation Hob
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InitMmu (MemoryTable);
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if (FeaturePcdGet (PcdPrePiProduceMemoryTypeInformationHob)) {
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// Optional feature that helps prevent EFI memory map fragmentation.
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BuildMemoryTypeInformationHob ();
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}
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return EFI_SUCCESS;
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}
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