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1 | //\r | |
2 | // Copyright (c) 2011-2013, ARM Limited. All rights reserved.\r | |
3 | // Copyright (c) 2015-2016, Linaro Limited. All rights reserved.\r | |
4 | //\r | |
5 | // SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | //\r | |
7 | //\r | |
8 | \r | |
9 | #include <AsmMacroIoLibV8.h>\r | |
10 | \r | |
11 | ASM_FUNC(_ModuleEntryPoint)\r | |
12 | bl ASM_PFX(DiscoverDramFromDt)\r | |
13 | \r | |
14 | // Get ID of this CPU in Multicore system\r | |
15 | bl ASM_PFX(ArmReadMpidr)\r | |
16 | // Keep a copy of the MpId register value\r | |
17 | mov x20, x0\r | |
18 | \r | |
19 | // Check if we can install the stack at the top of the System Memory or if we need\r | |
20 | // to install the stacks at the bottom of the Firmware Device (case the FD is located\r | |
21 | // at the top of the DRAM)\r | |
22 | _SetupStackPosition:\r | |
23 | // Compute Top of System Memory\r | |
24 | ldr x1, PcdGet64 (PcdSystemMemoryBase)\r | |
25 | ldr x2, PcdGet64 (PcdSystemMemorySize)\r | |
26 | sub x2, x2, #1\r | |
27 | add x1, x1, x2 // x1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize\r | |
28 | \r | |
29 | // Calculate Top of the Firmware Device\r | |
30 | ldr x2, PcdGet64 (PcdFdBaseAddress)\r | |
31 | MOV32 (w3, FixedPcdGet32 (PcdFdSize) - 1)\r | |
32 | add x3, x3, x2 // x3 = FdTop = PcdFdBaseAddress + PcdFdSize\r | |
33 | \r | |
34 | // UEFI Memory Size (stacks are allocated in this region)\r | |
35 | MOV32 (x4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize))\r | |
36 | \r | |
37 | //\r | |
38 | // Reserve the memory for the UEFI region (contain stacks on its top)\r | |
39 | //\r | |
40 | \r | |
41 | // Calculate how much space there is between the top of the Firmware and the Top of the System Memory\r | |
42 | subs x0, x1, x3 // x0 = SystemMemoryTop - FdTop\r | |
43 | b.mi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM\r | |
44 | cmp x0, x4\r | |
45 | b.ge _SetupStack\r | |
46 | \r | |
47 | // Case the top of stacks is the FdBaseAddress\r | |
48 | mov x1, x2\r | |
49 | \r | |
50 | _SetupStack:\r | |
51 | // x1 contains the top of the stack (and the UEFI Memory)\r | |
52 | \r | |
53 | // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment\r | |
54 | // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the\r | |
55 | // top of the memory space)\r | |
56 | adds x21, x1, #1\r | |
57 | b.cs _SetupOverflowStack\r | |
58 | \r | |
59 | _SetupAlignedStack:\r | |
60 | mov x1, x21\r | |
61 | b _GetBaseUefiMemory\r | |
62 | \r | |
63 | _SetupOverflowStack:\r | |
64 | // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE\r | |
65 | // aligned (4KB)\r | |
66 | and x1, x1, ~EFI_PAGE_MASK\r | |
67 | \r | |
68 | _GetBaseUefiMemory:\r | |
69 | // Calculate the Base of the UEFI Memory\r | |
70 | sub x21, x1, x4\r | |
71 | \r | |
72 | _GetStackBase:\r | |
73 | // r1 = The top of the Mpcore Stacks\r | |
74 | mov sp, x1\r | |
75 | \r | |
76 | // Stack for the primary core = PrimaryCoreStack\r | |
77 | MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))\r | |
78 | sub x22, x1, x2\r | |
79 | \r | |
80 | mov x0, x20\r | |
81 | mov x1, x21\r | |
82 | mov x2, x22\r | |
83 | \r | |
84 | // Set the frame pointer to NULL so any backtraces terminate here\r | |
85 | mov x29, xzr\r | |
86 | \r | |
87 | // Jump to PrePiCore C code\r | |
88 | // x0 = MpId\r | |
89 | // x1 = UefiMemoryBase\r | |
90 | // x2 = StacksBase\r | |
91 | bl ASM_PFX(CEntryPoint)\r | |
92 | \r | |
93 | _NeverReturn:\r | |
94 | b _NeverReturn\r | |
95 | \r | |
96 | // VOID\r | |
97 | // DiscoverDramFromDt (\r | |
98 | // VOID *DeviceTreeBaseAddress, // passed by loader in x0\r | |
99 | // VOID *ImageBase // passed by FDF trampoline in x1\r | |
100 | // );\r | |
101 | ASM_PFX(DiscoverDramFromDt):\r | |
102 | //\r | |
103 | // If we are booting from RAM using the Linux kernel boot protocol, x0 will\r | |
104 | // point to the DTB image in memory. Otherwise, use the default value defined\r | |
105 | // by the platform.\r | |
106 | //\r | |
107 | cbnz x0, 0f\r | |
108 | ldr x0, PcdGet64 (PcdDeviceTreeInitialBaseAddress)\r | |
109 | \r | |
110 | 0:mov x29, x30 // preserve LR\r | |
111 | mov x28, x0 // preserve DTB pointer\r | |
112 | mov x27, x1 // preserve base of image pointer\r | |
113 | \r | |
114 | //\r | |
115 | // The base of the runtime image has been preserved in x1. Check whether\r | |
116 | // the expected magic number can be found in the header.\r | |
117 | //\r | |
118 | ldr w8, .LArm64LinuxMagic\r | |
119 | ldr w9, [x1, #0x38]\r | |
120 | cmp w8, w9\r | |
121 | bne .Lout\r | |
122 | \r | |
123 | //\r | |
124 | //\r | |
125 | // OK, so far so good. We have confirmed that we likely have a DTB and are\r | |
126 | // booting via the arm64 Linux boot protocol. Update the base-of-image PCD\r | |
127 | // to the actual relocated value, and add the shift of PcdFdBaseAddress to\r | |
128 | // PcdFvBaseAddress as well\r | |
129 | //\r | |
130 | adr x8, PcdGet64 (PcdFdBaseAddress)\r | |
131 | adr x9, PcdGet64 (PcdFvBaseAddress)\r | |
132 | ldr x6, [x8]\r | |
133 | ldr x7, [x9]\r | |
134 | sub x7, x7, x6\r | |
135 | add x7, x7, x1\r | |
136 | str x1, [x8]\r | |
137 | str x7, [x9]\r | |
138 | \r | |
139 | //\r | |
140 | // The runtime address may be different from the link time address so fix\r | |
141 | // up the PE/COFF relocations. Since we are calling a C function, use the\r | |
142 | // window at the beginning of the FD image as a temp stack.\r | |
143 | //\r | |
144 | mov x0, x7\r | |
145 | adr x1, PeCoffLoaderImageReadFromMemory\r | |
146 | mov sp, x7\r | |
147 | bl RelocatePeCoffImage\r | |
148 | \r | |
149 | //\r | |
150 | // Discover the memory size and offset from the DTB, and record in the\r | |
151 | // respective PCDs. This will also return false if a corrupt DTB is\r | |
152 | // encountered.\r | |
153 | //\r | |
154 | mov x0, x28\r | |
155 | adr x1, PcdGet64 (PcdSystemMemoryBase)\r | |
156 | adr x2, PcdGet64 (PcdSystemMemorySize)\r | |
157 | bl FindMemnode\r | |
158 | cbz x0, .Lout\r | |
159 | \r | |
160 | //\r | |
161 | // Copy the DTB to the slack space right after the 64 byte arm64/Linux style\r | |
162 | // image header at the base of this image (defined in the FDF), and record the\r | |
163 | // pointer in PcdDeviceTreeInitialBaseAddress.\r | |
164 | //\r | |
165 | adr x8, PcdGet64 (PcdDeviceTreeInitialBaseAddress)\r | |
166 | add x27, x27, #0x40\r | |
167 | str x27, [x8]\r | |
168 | \r | |
169 | mov x0, x27\r | |
170 | mov x1, x28\r | |
171 | bl CopyFdt\r | |
172 | \r | |
173 | .Lout:\r | |
174 | ret x29\r | |
175 | \r | |
176 | .LArm64LinuxMagic:\r | |
177 | .byte 0x41, 0x52, 0x4d, 0x64\r |