]>
Commit | Line | Data |
---|---|---|
cd872e40 | 1 | //\r |
5dbacdb2 | 2 | // Copyright (c) 2011-2015, ARM Limited. All rights reserved.\r |
cd872e40 | 3 | //\r |
4 | // This program and the accompanying materials\r | |
5 | // are licensed and made available under the terms and conditions of the BSD License\r | |
6 | // which accompanies this distribution. The full text of the license may be found at\r | |
7 | // http://opensource.org/licenses/bsd-license.php\r | |
8 | //\r | |
9 | // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | //\r | |
12 | //\r | |
13 | \r | |
14 | #include <AsmMacroIoLib.h>\r | |
cd872e40 | 15 | \r |
063ad84e | 16 | #include <Chipset/ArmV7.h>\r |
17 | \r | |
5dbacdb2 | 18 | GCC_ASM_EXPORT(mSystemMemoryEnd)\r |
cd872e40 | 19 | \r |
d2fa09a1 | 20 | ASM_FUNC(_ModuleEntryPoint)\r |
b5a57223 | 21 | // Do early platform specific actions\r |
22 | bl ASM_PFX(ArmPlatformPeiBootAction)\r | |
23 | \r | |
0787bc61 | 24 | // Get ID of this CPU in Multicore system\r |
25 | bl ASM_PFX(ArmReadMpidr)\r | |
bebda7ce | 26 | // Keep a copy of the MpId register value\r |
c2d87a49 | 27 | mov r8, r0\r |
cd872e40 | 28 | \r |
d269095b | 29 | _SetSVCMode:\r |
99565b88 | 30 | // Enter SVC mode, Disable FIQ and IRQ\r |
063ad84e | 31 | mov r1, #(CPSR_MODE_SVC | CPSR_IRQ | CPSR_FIQ)\r |
d269095b | 32 | msr CPSR_c, r1\r |
33 | \r | |
2dbcb8f0 | 34 | // Check if we can install the stack at the top of the System Memory or if we need\r |
d269095b | 35 | // to install the stacks at the bottom of the Firmware Device (case the FD is located\r |
36 | // at the top of the DRAM)\r | |
5dbacdb2 OM |
37 | _SystemMemoryEndInit:\r |
38 | ldr r1, mSystemMemoryEnd\r | |
39 | \r | |
40 | // Is mSystemMemoryEnd initialized?\r | |
41 | cmp r1, #0\r | |
42 | bne _SetupStackPosition\r | |
43 | \r | |
d2fa09a1 AB |
44 | MOV32 (r1, FixedPcdGet32(PcdSystemMemoryBase) + FixedPcdGet32(PcdSystemMemorySize) - 1)\r |
45 | \r | |
5dbacdb2 OM |
46 | // Update the global variable\r |
47 | adr r2, mSystemMemoryEnd\r | |
48 | str r1, [r2]\r | |
49 | \r | |
50 | _SetupStackPosition:\r | |
51 | // r1 = SystemMemoryTop\r | |
cd872e40 | 52 | \r |
d269095b | 53 | // Calculate Top of the Firmware Device\r |
d2fa09a1 AB |
54 | MOV32 (r2, FixedPcdGet32(PcdFdBaseAddress))\r |
55 | MOV32 (r3, FixedPcdGet32(PcdFdSize) - 1)\r | |
7defe7b3 | 56 | add r3, r3, r2 // r3 = FdTop = PcdFdBaseAddress + PcdFdSize\r |
d269095b | 57 | \r |
58 | // UEFI Memory Size (stacks are allocated in this region)\r | |
d2fa09a1 | 59 | MOV32 (r4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize))\r |
d269095b | 60 | \r |
61 | //\r | |
62 | // Reserve the memory for the UEFI region (contain stacks on its top)\r | |
63 | //\r | |
64 | \r | |
65 | // Calculate how much space there is between the top of the Firmware and the Top of the System Memory\r | |
91c38d4e RC |
66 | subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop\r |
67 | bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM\r | |
68 | cmp r0, r4\r | |
69 | bge _SetupStack\r | |
d269095b | 70 | \r |
71 | // Case the top of stacks is the FdBaseAddress\r | |
91c38d4e | 72 | mov r1, r2\r |
cd872e40 | 73 | \r |
74 | _SetupStack:\r | |
2dbcb8f0 | 75 | // r1 contains the top of the stack (and the UEFI Memory)\r |
d269095b | 76 | \r |
2569b068 | 77 | // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment\r |
78 | // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the\r | |
79 | // top of the memory space)\r | |
c2d87a49 | 80 | adds r9, r1, #1\r |
2569b068 | 81 | bcs _SetupOverflowStack\r |
82 | \r | |
83 | _SetupAlignedStack:\r | |
c2d87a49 | 84 | mov r1, r9\r |
2569b068 | 85 | b _GetBaseUefiMemory\r |
86 | \r | |
87 | _SetupOverflowStack:\r | |
88 | // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE\r | |
89 | // aligned (4KB)\r | |
d2fa09a1 AB |
90 | MOV32 (r9, ~EFI_PAGE_MASK & 0xFFFFFFFF)\r |
91 | and r1, r1, r9\r | |
2569b068 | 92 | \r |
93 | _GetBaseUefiMemory:\r | |
d269095b | 94 | // Calculate the Base of the UEFI Memory\r |
c2d87a49 | 95 | sub r9, r1, r4\r |
cd872e40 | 96 | \r |
2dbcb8f0 | 97 | _GetStackBase:\r |
1377db63 | 98 | // r1 = The top of the Mpcore Stacks\r |
2dbcb8f0 | 99 | // Stack for the primary core = PrimaryCoreStack\r |
d2fa09a1 | 100 | MOV32 (r2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))\r |
c2d87a49 | 101 | sub r10, r1, r2\r |
17839a45 | 102 | \r |
103 | // Stack for the secondary core = Number of Cores - 1\r | |
d2fa09a1 | 104 | MOV32 (r0, (FixedPcdGet32(PcdCoreCount) - 1) * FixedPcdGet32(PcdCPUCoreSecondaryStackSize))\r |
c2d87a49 | 105 | sub r10, r10, r1\r |
17839a45 | 106 | \r |
c2d87a49 | 107 | // r10 = The base of the MpCore Stacks (primary stack & secondary stacks)\r |
91c38d4e RC |
108 | mov r0, r10\r |
109 | mov r1, r8\r | |
17839a45 | 110 | //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)\r |
d2fa09a1 AB |
111 | MOV32 (r2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))\r |
112 | MOV32 (r3, FixedPcdGet32(PcdCPUCoreSecondaryStackSize))\r | |
91c38d4e | 113 | bl ASM_PFX(ArmPlatformStackSet)\r |
2dbcb8f0 | 114 | \r |
115 | // Is it the Primary Core ?\r | |
c2d87a49 | 116 | mov r0, r8\r |
bebda7ce | 117 | bl ASM_PFX(ArmPlatformIsPrimaryCore)\r |
118 | cmp r0, #1\r | |
cd872e40 | 119 | bne _PrepareArguments\r |
120 | \r | |
cd872e40 | 121 | _PrepareArguments:\r |
c2d87a49 OM |
122 | mov r0, r8\r |
123 | mov r1, r9\r | |
124 | mov r2, r10\r | |
c524ffbb | 125 | mov r3, sp\r |
126 | \r | |
cd872e40 | 127 | // Move sec startup address into a data register\r |
128 | // Ensure we're jumping to FV version of the code (not boot remapped alias)\r | |
d2fa09a1 | 129 | ldr r4, =ASM_PFX(CEntryPoint)\r |
cd872e40 | 130 | \r |
d269095b | 131 | // Jump to PrePiCore C code\r |
0787bc61 | 132 | // r0 = MpId\r |
cd872e40 | 133 | // r1 = UefiMemoryBase\r |
c524ffbb | 134 | // r2 = StacksBase\r |
c524ffbb | 135 | blx r4\r |
cd872e40 | 136 | \r |
2dbcb8f0 | 137 | _NeverReturn:\r |
138 | b _NeverReturn\r | |
139 | \r | |
d2fa09a1 | 140 | ASM_PFX(mSystemMemoryEnd): .8byte 0\r |