mirror of https://github.com/acidanthera/audk.git
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*
|
|
* Copyright (c) 2015, Linaro Ltd. All rights reserved.
|
|
*
|
|
* This program and the accompanying materials
|
|
* are licensed and made available under the terms and conditions of the BSD License
|
|
* which accompanies this distribution. The full text of the license may be found at
|
|
* http://opensource.org/licenses/bsd-license.php
|
|
*
|
|
* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
*/
|
|
|
|
#include <Uefi.h>
|
|
#include <Include/libfdt.h>
|
|
|
|
BOOLEAN
|
|
FindMemnode (
|
|
IN VOID *DeviceTreeBlob,
|
|
OUT UINT64 *SystemMemoryBase,
|
|
OUT UINT64 *SystemMemorySize
|
|
)
|
|
{
|
|
INT32 MemoryNode;
|
|
INT32 AddressCells;
|
|
INT32 SizeCells;
|
|
INT32 Length;
|
|
CONST INT32 *Prop;
|
|
|
|
if (fdt_check_header (DeviceTreeBlob) != 0) {
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// Look for a node called "memory" at the lowest level of the tree
|
|
//
|
|
MemoryNode = fdt_path_offset (DeviceTreeBlob, "/memory");
|
|
if (MemoryNode <= 0) {
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// Retrieve the #address-cells and #size-cells properties
|
|
// from the root node, or use the default if not provided.
|
|
//
|
|
AddressCells = 1;
|
|
SizeCells = 1;
|
|
|
|
Prop = fdt_getprop (DeviceTreeBlob, 0, "#address-cells", &Length);
|
|
if (Length == 4) {
|
|
AddressCells = fdt32_to_cpu (*Prop);
|
|
}
|
|
|
|
Prop = fdt_getprop (DeviceTreeBlob, 0, "#size-cells", &Length);
|
|
if (Length == 4) {
|
|
SizeCells = fdt32_to_cpu (*Prop);
|
|
}
|
|
|
|
//
|
|
// Now find the 'reg' property of the /memory node, and read the first
|
|
// range listed.
|
|
//
|
|
Prop = fdt_getprop (DeviceTreeBlob, MemoryNode, "reg", &Length);
|
|
|
|
if (Length < (AddressCells + SizeCells) * sizeof (INT32)) {
|
|
return FALSE;
|
|
}
|
|
|
|
if (AddressCells == 1) {
|
|
*SystemMemoryBase = fdt32_to_cpu (*Prop);
|
|
} else {
|
|
*SystemMemoryBase = fdt64_to_cpu (*(UINT64 *)Prop);
|
|
}
|
|
Prop += AddressCells;
|
|
|
|
if (SizeCells == 1) {
|
|
*SystemMemorySize = fdt32_to_cpu (*Prop);
|
|
} else {
|
|
*SystemMemorySize = fdt64_to_cpu (*(UINT64 *)Prop);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
VOID
|
|
CopyFdt (
|
|
IN VOID *FdtDest,
|
|
IN VOID *FdtSource
|
|
)
|
|
{
|
|
fdt_pack(FdtSource);
|
|
CopyMem (FdtDest, FdtSource, fdt_totalsize (FdtSource));
|
|
}
|