mirror of https://github.com/acidanthera/audk.git
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/** @file
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Copyright (c) 2014-2017, Linaro Limited. All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Library/DebugLib.h>
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#include <Library/PcdLib.h>
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#include <libfdt.h>
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RETURN_STATUS
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EFIAPI
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QemuVirtMemInfoPeiLibConstructor (
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VOID
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)
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{
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VOID *DeviceTreeBase;
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INT32 Node, Prev;
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UINT64 NewBase, CurBase;
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UINT64 NewSize, CurSize;
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CONST CHAR8 *Type;
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INT32 Len;
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CONST UINT64 *RegProp;
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RETURN_STATUS PcdStatus;
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NewBase = 0;
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NewSize = 0;
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DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
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ASSERT (DeviceTreeBase != NULL);
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//
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// Make sure we have a valid device tree blob
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//
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ASSERT (fdt_check_header (DeviceTreeBase) == 0);
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//
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// Look for the lowest memory node
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//
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for (Prev = 0;; Prev = Node) {
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Node = fdt_next_node (DeviceTreeBase, Prev, NULL);
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if (Node < 0) {
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break;
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}
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//
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// Check for memory node
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//
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Type = fdt_getprop (DeviceTreeBase, Node, "device_type", &Len);
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if (Type && AsciiStrnCmp (Type, "memory", Len) == 0) {
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//
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// Get the 'reg' property of this node. For now, we will assume
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// two 8 byte quantities for base and size, respectively.
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//
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RegProp = fdt_getprop (DeviceTreeBase, Node, "reg", &Len);
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if (RegProp != 0 && Len == (2 * sizeof (UINT64))) {
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CurBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
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CurSize = fdt64_to_cpu (ReadUnaligned64 (RegProp + 1));
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DEBUG ((DEBUG_INFO, "%a: System RAM @ 0x%lx - 0x%lx\n",
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__FUNCTION__, CurBase, CurBase + CurSize - 1));
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if (NewBase > CurBase || NewBase == 0) {
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NewBase = CurBase;
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NewSize = CurSize;
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}
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} else {
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DEBUG ((DEBUG_ERROR, "%a: Failed to parse FDT memory node\n",
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__FUNCTION__));
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}
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}
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}
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//
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// Make sure the start of DRAM matches our expectation
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//
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ASSERT (FixedPcdGet64 (PcdSystemMemoryBase) == NewBase);
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PcdStatus = PcdSet64S (PcdSystemMemorySize, NewSize);
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ASSERT_RETURN_ERROR (PcdStatus);
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//
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// We need to make sure that the machine we are running on has at least
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// 128 MB of memory configured, and is currently executing this binary from
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// NOR flash. This prevents a device tree image in DRAM from getting
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// clobbered when our caller installs permanent PEI RAM, before we have a
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// chance of marking its location as reserved or copy it to a freshly
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// allocated block in the permanent PEI RAM in the platform PEIM.
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//
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ASSERT (NewSize >= SIZE_128MB);
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ASSERT (
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(((UINT64)PcdGet64 (PcdFdBaseAddress) +
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(UINT64)PcdGet32 (PcdFdSize)) <= NewBase) ||
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((UINT64)PcdGet64 (PcdFdBaseAddress) >= (NewBase + NewSize)));
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return RETURN_SUCCESS;
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}
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