832709565e
ArmVirtQemuKernel and ArmVirtXen use essentially the same code to retrieve DRAM information from the DT /memory node at early boot, and invoke it via the ArmPlatformPeiBootAction () hook exposed by ArmPlatformLib. Let's move this code into the PrePi implementation these platforms share between them (and not with any other platforms) so we can eliminate another dependency on the messy ArmPlatformLib. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Laszlo Ersek <lersek@redhat.com>
91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/*
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* Copyright (c) 2015, Linaro Ltd. 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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#include <Uefi.h>
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#include <Include/libfdt.h>
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BOOLEAN
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FindMemnode (
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IN VOID *DeviceTreeBlob,
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OUT UINT64 *SystemMemoryBase,
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OUT UINT64 *SystemMemorySize
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)
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{
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INT32 MemoryNode;
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INT32 AddressCells;
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INT32 SizeCells;
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INT32 Length;
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CONST INT32 *Prop;
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if (fdt_check_header (DeviceTreeBlob) != 0) {
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return FALSE;
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}
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//
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// Look for a node called "memory" at the lowest level of the tree
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//
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MemoryNode = fdt_path_offset (DeviceTreeBlob, "/memory");
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if (MemoryNode <= 0) {
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return FALSE;
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}
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//
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// Retrieve the #address-cells and #size-cells properties
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// from the root node, or use the default if not provided.
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//
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AddressCells = 1;
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SizeCells = 1;
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Prop = fdt_getprop (DeviceTreeBlob, 0, "#address-cells", &Length);
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if (Length == 4) {
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AddressCells = fdt32_to_cpu (*Prop);
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}
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Prop = fdt_getprop (DeviceTreeBlob, 0, "#size-cells", &Length);
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if (Length == 4) {
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SizeCells = fdt32_to_cpu (*Prop);
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}
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//
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// Now find the 'reg' property of the /memory node, and read the first
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// range listed.
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//
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Prop = fdt_getprop (DeviceTreeBlob, MemoryNode, "reg", &Length);
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if (Length < (AddressCells + SizeCells) * sizeof (INT32)) {
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return FALSE;
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}
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*SystemMemoryBase = fdt32_to_cpu (Prop[0]);
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if (AddressCells > 1) {
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*SystemMemoryBase = (*SystemMemoryBase << 32) | fdt32_to_cpu (Prop[1]);
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}
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Prop += AddressCells;
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*SystemMemorySize = fdt32_to_cpu (Prop[0]);
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if (SizeCells > 1) {
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*SystemMemorySize = (*SystemMemorySize << 32) | fdt32_to_cpu (Prop[1]);
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}
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return TRUE;
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}
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VOID
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CopyFdt (
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IN VOID *FdtDest,
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IN VOID *FdtSource
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)
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{
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fdt_pack(FdtSource);
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CopyMem (FdtDest, FdtSource, fdt_totalsize (FdtSource));
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}
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