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d9325c8e | 1 | /** @file |
2 | * | |
0a6653bc | 3 | * Copyright (c) 2011-2012, ARM Limited. All rights reserved. |
d9325c8e | 4 | * |
5 | * This program and the accompanying materials | |
6 | * are licensed and made available under the terms and conditions of the BSD License | |
7 | * which accompanies this distribution. The full text of the license may be found at | |
8 | * http://opensource.org/licenses/bsd-license.php | |
9 | * | |
10 | * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
11 | * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
12 | * | |
13 | **/ | |
14 | ||
15 | #include "BdsInternal.h" | |
0a6653bc | 16 | #include "BdsLinuxLoader.h" |
d9325c8e | 17 | |
18 | // Point to the current ATAG | |
19 | STATIC LINUX_ATAG *mLinuxKernelCurrentAtag; | |
20 | ||
21 | STATIC | |
22 | VOID | |
23 | SetupCoreTag ( | |
24 | IN UINT32 PageSize | |
25 | ) | |
26 | { | |
27 | mLinuxKernelCurrentAtag->header.size = tag_size(LINUX_ATAG_CORE); | |
28 | mLinuxKernelCurrentAtag->header.type = ATAG_CORE; | |
29 | ||
30 | mLinuxKernelCurrentAtag->body.core_tag.flags = 1; /* ensure read-only */ | |
31 | mLinuxKernelCurrentAtag->body.core_tag.pagesize = PageSize; /* systems PageSize (4k) */ | |
32 | mLinuxKernelCurrentAtag->body.core_tag.rootdev = 0; /* zero root device (typically overridden from kernel command line )*/ | |
33 | ||
34 | // move pointer to next tag | |
35 | mLinuxKernelCurrentAtag = next_tag_address(mLinuxKernelCurrentAtag); | |
36 | } | |
37 | ||
38 | STATIC | |
39 | VOID | |
40 | SetupMemTag ( | |
41 | IN UINTN StartAddress, | |
42 | IN UINT32 Size | |
43 | ) | |
44 | { | |
45 | mLinuxKernelCurrentAtag->header.size = tag_size(LINUX_ATAG_MEM); | |
46 | mLinuxKernelCurrentAtag->header.type = ATAG_MEM; | |
47 | ||
48 | mLinuxKernelCurrentAtag->body.mem_tag.start = StartAddress; /* Start of memory chunk for AtagMem */ | |
49 | mLinuxKernelCurrentAtag->body.mem_tag.size = Size; /* Size of memory chunk for AtagMem */ | |
50 | ||
51 | // move pointer to next tag | |
52 | mLinuxKernelCurrentAtag = next_tag_address(mLinuxKernelCurrentAtag); | |
53 | } | |
54 | ||
55 | STATIC | |
56 | VOID | |
57 | SetupCmdlineTag ( | |
58 | IN CONST CHAR8 *CmdLine | |
59 | ) | |
60 | { | |
61 | UINT32 LineLength; | |
62 | ||
63 | // Increment the line length by 1 to account for the null string terminator character | |
64 | LineLength = AsciiStrLen(CmdLine) + 1; | |
65 | ||
66 | /* Check for NULL strings. | |
67 | * Do not insert a tag for an empty CommandLine, don't even modify the tag address pointer. | |
68 | * Remember, you have at least one null string terminator character. | |
69 | */ | |
70 | if(LineLength > 1) { | |
71 | mLinuxKernelCurrentAtag->header.size = ((UINT32)sizeof(LINUX_ATAG_HEADER) + LineLength + (UINT32)3) >> 2; | |
72 | mLinuxKernelCurrentAtag->header.type = ATAG_CMDLINE; | |
73 | ||
74 | /* place CommandLine into tag */ | |
75 | AsciiStrCpy(mLinuxKernelCurrentAtag->body.cmdline_tag.cmdline, CmdLine); | |
76 | ||
77 | // move pointer to next tag | |
78 | mLinuxKernelCurrentAtag = next_tag_address(mLinuxKernelCurrentAtag); | |
79 | } | |
80 | } | |
81 | ||
0a6653bc | 82 | STATIC |
83 | VOID | |
84 | SetupInitrdTag ( | |
85 | IN UINT32 InitrdImage, | |
86 | IN UINT32 InitrdImageSize | |
87 | ) | |
88 | { | |
89 | mLinuxKernelCurrentAtag->header.size = tag_size(LINUX_ATAG_INITRD2); | |
90 | mLinuxKernelCurrentAtag->header.type = ATAG_INITRD2; | |
91 | ||
92 | mLinuxKernelCurrentAtag->body.initrd2_tag.start = InitrdImage; | |
93 | mLinuxKernelCurrentAtag->body.initrd2_tag.size = InitrdImageSize; | |
94 | ||
95 | // Move pointer to next tag | |
96 | mLinuxKernelCurrentAtag = next_tag_address(mLinuxKernelCurrentAtag); | |
97 | } | |
d9325c8e | 98 | STATIC |
99 | VOID | |
100 | SetupEndTag ( | |
101 | VOID | |
102 | ) | |
103 | { | |
104 | // Empty tag ends list; this has zero length and no body | |
105 | mLinuxKernelCurrentAtag->header.type = ATAG_NONE; | |
106 | mLinuxKernelCurrentAtag->header.size = 0; | |
107 | ||
108 | /* We can not calculate the next address by using the standard macro: | |
109 | * Params = next_tag_address(Params); | |
110 | * because it relies on the header.size, which here it is 0 (zero). | |
111 | * The easiest way is to add the sizeof(mLinuxKernelCurrentAtag->header). | |
112 | */ | |
113 | mLinuxKernelCurrentAtag = (LINUX_ATAG*)((UINT32)mLinuxKernelCurrentAtag + sizeof(mLinuxKernelCurrentAtag->header)); | |
114 | } | |
115 | ||
116 | EFI_STATUS | |
117 | PrepareAtagList ( | |
19a7404a | 118 | IN CONST CHAR8* CommandLineString, |
119 | IN EFI_PHYSICAL_ADDRESS InitrdImage, | |
120 | IN UINTN InitrdImageSize, | |
121 | OUT EFI_PHYSICAL_ADDRESS *AtagBase, | |
122 | OUT UINT32 *AtagSize | |
d9325c8e | 123 | ) |
124 | { | |
125 | EFI_STATUS Status; | |
126 | LIST_ENTRY *ResourceLink; | |
127 | LIST_ENTRY ResourceList; | |
128 | EFI_PHYSICAL_ADDRESS AtagStartAddress; | |
129 | BDS_SYSTEM_MEMORY_RESOURCE *Resource; | |
130 | ||
131 | AtagStartAddress = LINUX_ATAG_MAX_OFFSET; | |
132 | Status = gBS->AllocatePages (AllocateMaxAddress, EfiBootServicesData, EFI_SIZE_TO_PAGES(ATAG_MAX_SIZE), &AtagStartAddress); | |
133 | if (EFI_ERROR(Status)) { | |
0a6653bc | 134 | DEBUG ((EFI_D_WARN, "Warning: Failed to allocate Atag at 0x%lX (%r). The Atag will be allocated somewhere else in System Memory.\n", AtagStartAddress, Status)); |
d9325c8e | 135 | Status = gBS->AllocatePages (AllocateAnyPages, EfiBootServicesData, EFI_SIZE_TO_PAGES(ATAG_MAX_SIZE), &AtagStartAddress); |
136 | ASSERT_EFI_ERROR(Status); | |
137 | } | |
138 | ||
139 | // Ready to setup the atag list | |
140 | mLinuxKernelCurrentAtag = (LINUX_ATAG*)(UINTN)AtagStartAddress; | |
141 | ||
142 | // Standard core tag 4k PageSize | |
143 | SetupCoreTag( (UINT32)SIZE_4KB ); | |
144 | ||
145 | // Physical memory setup | |
146 | GetSystemMemoryResources (&ResourceList); | |
147 | ResourceLink = ResourceList.ForwardLink; | |
148 | while (ResourceLink != NULL && ResourceLink != &ResourceList) { | |
149 | Resource = (BDS_SYSTEM_MEMORY_RESOURCE*)ResourceLink; | |
150 | DEBUG((EFI_D_INFO,"- [0x%08X,0x%08X]\n",(UINT32)Resource->PhysicalStart,(UINT32)Resource->PhysicalStart+(UINT32)Resource->ResourceLength)); | |
151 | SetupMemTag( (UINT32)Resource->PhysicalStart, (UINT32)Resource->ResourceLength ); | |
152 | ResourceLink = ResourceLink->ForwardLink; | |
153 | } | |
154 | ||
155 | // CommandLine setting root device | |
156 | if (CommandLineString) { | |
157 | SetupCmdlineTag (CommandLineString); | |
158 | } | |
159 | ||
160 | if (InitrdImageSize > 0 && InitrdImage != 0) { | |
0a6653bc | 161 | SetupInitrdTag ((UINT32)InitrdImage, (UINT32)InitrdImageSize); |
d9325c8e | 162 | } |
163 | ||
164 | // End of tags | |
165 | SetupEndTag(); | |
166 | ||
167 | // Calculate atag list size | |
19a7404a | 168 | *AtagBase = AtagStartAddress; |
d9325c8e | 169 | *AtagSize = (UINT32)mLinuxKernelCurrentAtag - (UINT32)AtagStartAddress + 1; |
170 | ||
171 | return EFI_SUCCESS; | |
172 | } | |
173 |