a36d531f5d
This is an implementation of ArmPlatformLib that discovers the size of system DRAM from a device tree blob located at the address passed in gArmTokenSpaceGuid.PcdDeviceTreeBaseAddress, which should equal the value in gArmTokenSpaceGuid.PcdSystemMemoryBase. As the device tree blob is passed in system DRAM, this library can only be used if sufficient DRAM is available (>= 128 MB) and if not using shadowed NOR. The reason for this is that it makes it easier to guarantee that such a device tree blob at base of DRAM will not be clobbered before we get a chance to preserve it. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Michael Casadevall <michael.casadevall@linaro.org> Acked-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-By: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16138 6f19259b-4bc3-4df7-8a09-765794883524
108 lines
3.7 KiB
C
108 lines
3.7 KiB
C
/** @file
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*
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* Copyright (c) 2014, Linaro Limited. All rights reserved.
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*
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* This program and the accompanying materials
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* are licensed and made available under the terms and conditions of the BSD License
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* which accompanies this distribution. The full text of the license may be found at
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* http://opensource.org/licenses/bsd-license.php
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*
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* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*
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**/
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#include <Library/ArmPlatformLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/PcdLib.h>
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#include <Library/IoLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/ArmPlatformGlobalVariableLib.h>
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#include <ArmPlatform.h>
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// Number of Virtual Memory Map Descriptors
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#define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS 4
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// DDR attributes
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#define DDR_ATTRIBUTES_CACHED ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK
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#define DDR_ATTRIBUTES_UNCACHED ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED
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EFI_PHYSICAL_ADDRESS
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ArmGetPhysAddrTop (
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VOID
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);
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/**
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Return the Virtual Memory Map of your platform
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This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
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on your platform.
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@param[out] VirtualMemoryMap Array of ARM_MEMORY_REGION_DESCRIPTOR
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describing a Physical-to-Virtual Memory
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mapping. This array must be ended by a
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zero-filled entry
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**/
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VOID
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ArmPlatformGetVirtualMemoryMap (
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IN ARM_MEMORY_REGION_DESCRIPTOR** VirtualMemoryMap
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)
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{
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ARM_MEMORY_REGION_ATTRIBUTES CacheAttributes;
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ARM_MEMORY_REGION_DESCRIPTOR *VirtualMemoryTable;
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ASSERT (VirtualMemoryMap != NULL);
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VirtualMemoryTable = AllocatePages (
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EFI_SIZE_TO_PAGES (
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sizeof (ARM_MEMORY_REGION_DESCRIPTOR)
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* MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS
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)
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);
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if (VirtualMemoryTable == NULL) {
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DEBUG ((EFI_D_ERROR, "%a: Error: Failed AllocatePages()\n", __FUNCTION__));
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return;
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}
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if (FeaturePcdGet (PcdCacheEnable) == TRUE) {
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CacheAttributes = DDR_ATTRIBUTES_CACHED;
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} else {
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CacheAttributes = DDR_ATTRIBUTES_UNCACHED;
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}
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// System DRAM
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VirtualMemoryTable[0].PhysicalBase = PcdGet64 (PcdSystemMemoryBase);
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VirtualMemoryTable[0].VirtualBase = VirtualMemoryTable[0].PhysicalBase;
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VirtualMemoryTable[0].Length = PcdGet64 (PcdSystemMemorySize);
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VirtualMemoryTable[0].Attributes = CacheAttributes;
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DEBUG ((EFI_D_INFO, "%a: Dumping System DRAM Memory Map:\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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__FUNCTION__,
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VirtualMemoryTable[0].PhysicalBase,
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VirtualMemoryTable[0].VirtualBase,
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VirtualMemoryTable[0].Length));
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// Peripheral space before DRAM
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VirtualMemoryTable[1].PhysicalBase = 0x0;
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VirtualMemoryTable[1].VirtualBase = 0x0;
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VirtualMemoryTable[1].Length = VirtualMemoryTable[0].PhysicalBase;
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VirtualMemoryTable[1].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
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// Peripheral space after DRAM
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VirtualMemoryTable[2].PhysicalBase = VirtualMemoryTable[0].Length + VirtualMemoryTable[1].Length;
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VirtualMemoryTable[2].VirtualBase = VirtualMemoryTable[2].PhysicalBase;
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VirtualMemoryTable[2].Length = ArmGetPhysAddrTop () - VirtualMemoryTable[2].PhysicalBase;
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VirtualMemoryTable[2].Attributes = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
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// End of Table
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ZeroMem (&VirtualMemoryTable[3], sizeof (ARM_MEMORY_REGION_DESCRIPTOR));
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*VirtualMemoryMap = VirtualMemoryTable;
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}
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