1 /** @file
2 * High memory node enumeration DXE driver for ARM Virtual Machines
3 *
4 * Copyright (c) 2015, Linaro Ltd. All rights reserved.
5 *
6 * This program and the accompanying materials are licensed and made available
7 * under the terms and conditions of the BSD License which accompanies this
8 * distribution. The full text of the license may be found at
9 * http://opensource.org/licenses/bsd-license.php
10 *
11 * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
13 * IMPLIED.
14 *
15 **/
16
17 #include <Library/BaseLib.h>
18 #include <Library/UefiDriverEntryPoint.h>
19 #include <Library/DebugLib.h>
20 #include <Library/PcdLib.h>
21 #include <Library/HobLib.h>
22 #include <libfdt.h>
23 #include <Library/DxeServicesTableLib.h>
24
25 EFI_STATUS
26 EFIAPI
InitializeHighMemDxe(IN EFI_HANDLE ImageHandle,IN EFI_SYSTEM_TABLE * SystemTable)27 InitializeHighMemDxe (
28 IN EFI_HANDLE ImageHandle,
29 IN EFI_SYSTEM_TABLE *SystemTable
30 )
31 {
32 VOID *Hob;
33 VOID *DeviceTreeBase;
34 INT32 Node, Prev;
35 EFI_STATUS Status;
36 CONST CHAR8 *Type;
37 INT32 Len;
38 CONST VOID *RegProp;
39 UINT64 CurBase;
40 UINT64 CurSize;
41
42 Hob = GetFirstGuidHob(&gFdtHobGuid);
43 if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (UINT64)) {
44 return EFI_NOT_FOUND;
45 }
46 DeviceTreeBase = (VOID *)(UINTN)*(UINT64 *)GET_GUID_HOB_DATA (Hob);
47
48 if (fdt_check_header (DeviceTreeBase) != 0) {
49 DEBUG ((EFI_D_ERROR, "%a: No DTB found @ 0x%p\n", __FUNCTION__,
50 DeviceTreeBase));
51 return EFI_NOT_FOUND;
52 }
53
54 DEBUG ((EFI_D_INFO, "%a: DTB @ 0x%p\n", __FUNCTION__, DeviceTreeBase));
55
56 //
57 // Check for memory node and add the memory spaces expect the lowest one
58 //
59 for (Prev = 0;; Prev = Node) {
60 Node = fdt_next_node (DeviceTreeBase, Prev, NULL);
61 if (Node < 0) {
62 break;
63 }
64
65 Type = fdt_getprop (DeviceTreeBase, Node, "device_type", &Len);
66 if (Type && AsciiStrnCmp (Type, "memory", Len) == 0) {
67 //
68 // Get the 'reg' property of this node. For now, we will assume
69 // two 8 byte quantities for base and size, respectively.
70 //
71 RegProp = fdt_getprop (DeviceTreeBase, Node, "reg", &Len);
72 if (RegProp != NULL && Len == (2 * sizeof (UINT64))) {
73
74 CurBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
75 CurSize = fdt64_to_cpu (((UINT64 *)RegProp)[1]);
76
77 if (FixedPcdGet64 (PcdSystemMemoryBase) != CurBase) {
78 Status = gDS->AddMemorySpace (
79 EfiGcdMemoryTypeSystemMemory,
80 CurBase, CurSize,
81 EFI_MEMORY_WB | EFI_MEMORY_WC |
82 EFI_MEMORY_WT | EFI_MEMORY_UC);
83
84 if (EFI_ERROR (Status)) {
85 DEBUG ((EFI_D_ERROR,
86 "%a: Failed to add System RAM @ 0x%lx - 0x%lx (%r)\n",
87 __FUNCTION__, CurBase, CurBase + CurSize - 1, Status));
88 continue;
89 }
90
91 Status = gDS->SetMemorySpaceAttributes (
92 CurBase, CurSize,
93 EFI_MEMORY_WB);
94
95 if (EFI_ERROR (Status)) {
96 DEBUG ((EFI_D_ERROR,
97 "%a: Failed to set System RAM @ 0x%lx - 0x%lx attribute (%r)\n",
98 __FUNCTION__, CurBase, CurBase + CurSize - 1, Status));
99 } else {
100 DEBUG ((EFI_D_INFO, "%a: Add System RAM @ 0x%lx - 0x%lx\n",
101 __FUNCTION__, CurBase, CurBase + CurSize - 1));
102 }
103 }
104 }
105 }
106 }
107
108 return EFI_SUCCESS;
109 }
110