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f9a9d2dc AB |
1 | //\r |
2 | // Copyright (c) 2011-2013, ARM Limited. All rights reserved.\r | |
dfc28388 | 3 | // Copyright (c) 2015-2016, Linaro Limited. All rights reserved.\r |
f9a9d2dc AB |
4 | //\r |
5 | // This program and the accompanying materials\r | |
6 | // are licensed and made available under the terms and conditions of the BSD License\r | |
7 | // which accompanies this distribution. The full text of the license may be found at\r | |
8 | // http://opensource.org/licenses/bsd-license.php\r | |
9 | //\r | |
10 | // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | //\r | |
13 | //\r | |
14 | \r | |
15 | #include <AsmMacroIoLibV8.h>\r | |
f9a9d2dc | 16 | \r |
dfc28388 | 17 | ASM_FUNC(_ModuleEntryPoint)\r |
f9a9d2dc AB |
18 | //\r |
19 | // We are built as a ET_DYN PIE executable, so we need to process all\r | |
20 | // relative relocations regardless of whether or not we are executing from\r | |
21 | // the same offset we were linked at. This is only possible if we are\r | |
22 | // running from RAM.\r | |
23 | //\r | |
24 | adr x8, __reloc_base\r | |
25 | adr x9, __reloc_start\r | |
26 | adr x10, __reloc_end\r | |
27 | \r | |
28 | .Lreloc_loop:\r | |
29 | cmp x9, x10\r | |
30 | bhs .Lreloc_done\r | |
31 | \r | |
32 | //\r | |
33 | // AArch64 uses the ELF64 RELA format, which means each entry in the\r | |
34 | // relocation table consists of\r | |
35 | //\r | |
36 | // UINT64 offset : the relative offset of the value that needs to\r | |
37 | // be relocated\r | |
38 | // UINT64 info : relocation type and symbol index (the latter is\r | |
39 | // not used for R_AARCH64_RELATIVE relocations)\r | |
40 | // UINT64 addend : value to be added to the value being relocated\r | |
41 | //\r | |
42 | ldp x11, x12, [x9], #24 // read offset into x11 and info into x12\r | |
43 | cmp x12, #0x403 // check info == R_AARCH64_RELATIVE?\r | |
44 | bne .Lreloc_loop // not a relative relocation? then skip\r | |
45 | \r | |
46 | ldr x12, [x9, #-8] // read addend into x12\r | |
47 | add x12, x12, x8 // add reloc base to addend to get relocated value\r | |
48 | str x12, [x11, x8] // write relocated value at offset\r | |
49 | b .Lreloc_loop\r | |
50 | .Lreloc_done:\r | |
51 | \r | |
83270956 | 52 | bl ASM_PFX(DiscoverDramFromDt)\r |
f9a9d2dc AB |
53 | \r |
54 | // Get ID of this CPU in Multicore system\r | |
55 | bl ASM_PFX(ArmReadMpidr)\r | |
56 | // Keep a copy of the MpId register value\r | |
298f8361 | 57 | mov x20, x0\r |
f9a9d2dc AB |
58 | \r |
59 | // Check if we can install the stack at the top of the System Memory or if we need\r | |
60 | // to install the stacks at the bottom of the Firmware Device (case the FD is located\r | |
61 | // at the top of the DRAM)\r | |
62 | _SetupStackPosition:\r | |
63 | // Compute Top of System Memory\r | |
64 | ldr x1, PcdGet64 (PcdSystemMemoryBase)\r | |
65 | ldr x2, PcdGet64 (PcdSystemMemorySize)\r | |
66 | sub x2, x2, #1\r | |
67 | add x1, x1, x2 // x1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize\r | |
68 | \r | |
69 | // Calculate Top of the Firmware Device\r | |
70 | ldr x2, PcdGet64 (PcdFdBaseAddress)\r | |
dfc28388 | 71 | MOV32 (w3, FixedPcdGet32 (PcdFdSize) - 1)\r |
f9a9d2dc AB |
72 | add x3, x3, x2 // x3 = FdTop = PcdFdBaseAddress + PcdFdSize\r |
73 | \r | |
74 | // UEFI Memory Size (stacks are allocated in this region)\r | |
dfc28388 | 75 | MOV32 (x4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize))\r |
f9a9d2dc AB |
76 | \r |
77 | //\r | |
78 | // Reserve the memory for the UEFI region (contain stacks on its top)\r | |
79 | //\r | |
80 | \r | |
81 | // Calculate how much space there is between the top of the Firmware and the Top of the System Memory\r | |
82 | subs x0, x1, x3 // x0 = SystemMemoryTop - FdTop\r | |
83 | b.mi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM\r | |
84 | cmp x0, x4\r | |
85 | b.ge _SetupStack\r | |
86 | \r | |
87 | // Case the top of stacks is the FdBaseAddress\r | |
88 | mov x1, x2\r | |
89 | \r | |
90 | _SetupStack:\r | |
91 | // x1 contains the top of the stack (and the UEFI Memory)\r | |
92 | \r | |
93 | // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment\r | |
94 | // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the\r | |
95 | // top of the memory space)\r | |
298f8361 | 96 | adds x21, x1, #1\r |
f9a9d2dc AB |
97 | b.cs _SetupOverflowStack\r |
98 | \r | |
99 | _SetupAlignedStack:\r | |
298f8361 | 100 | mov x1, x21\r |
f9a9d2dc AB |
101 | b _GetBaseUefiMemory\r |
102 | \r | |
103 | _SetupOverflowStack:\r | |
104 | // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE\r | |
105 | // aligned (4KB)\r | |
dfc28388 | 106 | and x1, x1, ~EFI_PAGE_MASK\r |
f9a9d2dc AB |
107 | \r |
108 | _GetBaseUefiMemory:\r | |
109 | // Calculate the Base of the UEFI Memory\r | |
298f8361 | 110 | sub x21, x1, x4\r |
f9a9d2dc AB |
111 | \r |
112 | _GetStackBase:\r | |
113 | // r1 = The top of the Mpcore Stacks\r | |
523509ae AB |
114 | mov sp, x1\r |
115 | \r | |
f9a9d2dc | 116 | // Stack for the primary core = PrimaryCoreStack\r |
dfc28388 | 117 | MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))\r |
298f8361 | 118 | sub x22, x1, x2\r |
f9a9d2dc | 119 | \r |
298f8361 AB |
120 | mov x0, x20\r |
121 | mov x1, x21\r | |
122 | mov x2, x22\r | |
f9a9d2dc | 123 | \r |
f9a9d2dc AB |
124 | // Jump to PrePiCore C code\r |
125 | // x0 = MpId\r | |
126 | // x1 = UefiMemoryBase\r | |
127 | // x2 = StacksBase\r | |
16a9fe2c | 128 | bl ASM_PFX(CEntryPoint)\r |
f9a9d2dc AB |
129 | \r |
130 | _NeverReturn:\r | |
131 | b _NeverReturn\r | |
83270956 AB |
132 | \r |
133 | // VOID\r | |
134 | // DiscoverDramFromDt (\r | |
135 | // VOID *DeviceTreeBaseAddress, // passed by loader in x0\r | |
136 | // VOID *ImageBase // passed by FDF trampoline in x1\r | |
137 | // );\r | |
138 | ASM_PFX(DiscoverDramFromDt):\r | |
139 | //\r | |
140 | // If we are booting from RAM using the Linux kernel boot protocol, x0 will\r | |
141 | // point to the DTB image in memory. Otherwise, use the default value defined\r | |
142 | // by the platform.\r | |
143 | //\r | |
144 | cbnz x0, 0f\r | |
145 | ldr x0, PcdGet64 (PcdDeviceTreeInitialBaseAddress)\r | |
146 | \r | |
147 | 0:mov x29, x30 // preserve LR\r | |
148 | mov x28, x0 // preserve DTB pointer\r | |
149 | mov x27, x1 // preserve base of image pointer\r | |
150 | \r | |
151 | //\r | |
152 | // The base of the runtime image has been preserved in x1. Check whether\r | |
153 | // the expected magic number can be found in the header.\r | |
154 | //\r | |
155 | ldr w8, .LArm64LinuxMagic\r | |
156 | ldr w9, [x1, #0x38]\r | |
157 | cmp w8, w9\r | |
158 | bne .Lout\r | |
159 | \r | |
160 | //\r | |
161 | //\r | |
162 | // OK, so far so good. We have confirmed that we likely have a DTB and are\r | |
163 | // booting via the arm64 Linux boot protocol. Update the base-of-image PCD\r | |
164 | // to the actual relocated value, and add the shift of PcdFdBaseAddress to\r | |
165 | // PcdFvBaseAddress as well\r | |
166 | //\r | |
167 | adr x8, PcdGet64 (PcdFdBaseAddress)\r | |
168 | adr x9, PcdGet64 (PcdFvBaseAddress)\r | |
169 | ldr x6, [x8]\r | |
170 | ldr x7, [x9]\r | |
171 | sub x7, x7, x6\r | |
172 | add x7, x7, x1\r | |
173 | str x1, [x8]\r | |
174 | str x7, [x9]\r | |
175 | \r | |
176 | //\r | |
177 | // Discover the memory size and offset from the DTB, and record in the\r | |
178 | // respective PCDs. This will also return false if a corrupt DTB is\r | |
179 | // encountered. Since we are calling a C function, use the window at the\r | |
180 | // beginning of the FD image as a temp stack.\r | |
181 | //\r | |
182 | adr x1, PcdGet64 (PcdSystemMemoryBase)\r | |
183 | adr x2, PcdGet64 (PcdSystemMemorySize)\r | |
184 | mov sp, x7\r | |
185 | bl FindMemnode\r | |
186 | cbz x0, .Lout\r | |
187 | \r | |
188 | //\r | |
189 | // Copy the DTB to the slack space right after the 64 byte arm64/Linux style\r | |
190 | // image header at the base of this image (defined in the FDF), and record the\r | |
191 | // pointer in PcdDeviceTreeInitialBaseAddress.\r | |
192 | //\r | |
193 | adr x8, PcdGet64 (PcdDeviceTreeInitialBaseAddress)\r | |
194 | add x27, x27, #0x40\r | |
195 | str x27, [x8]\r | |
196 | \r | |
197 | mov x0, x27\r | |
198 | mov x1, x28\r | |
199 | bl CopyFdt\r | |
200 | \r | |
201 | .Lout:\r | |
202 | ret x29\r | |
203 | \r | |
204 | .LArm64LinuxMagic:\r | |
205 | .byte 0x41, 0x52, 0x4d, 0x64\r |