//\r
// Copyright (c) 2011-2013, ARM Limited. All rights reserved.\r
-// Copyright (c) 2015, Linaro Limited. All rights reserved.\r
+// Copyright (c) 2015-2016, Linaro Limited. All rights reserved.\r
//\r
// This program and the accompanying materials\r
// are licensed and made available under the terms and conditions of the BSD License\r
//\r
\r
#include <AsmMacroIoLibV8.h>\r
-#include <Base.h>\r
-#include <Library/PcdLib.h>\r
-#include <AutoGen.h>\r
\r
-.text\r
-.align 3\r
-\r
-GCC_ASM_IMPORT(ArmPlatformIsPrimaryCore)\r
-GCC_ASM_IMPORT(ArmReadMpidr)\r
-GCC_ASM_IMPORT(ArmPlatformPeiBootAction)\r
-GCC_ASM_IMPORT(ArmPlatformStackSet)\r
-GCC_ASM_EXPORT(_ModuleEntryPoint)\r
-ASM_GLOBAL ASM_PFX(mSystemMemoryEnd)\r
-\r
-StartupAddr: .8byte ASM_PFX(CEntryPoint)\r
-ASM_PFX(mSystemMemoryEnd): .8byte 0\r
-\r
-ASM_PFX(_ModuleEntryPoint):\r
+ASM_FUNC(_ModuleEntryPoint)\r
//\r
// We are built as a ET_DYN PIE executable, so we need to process all\r
// relative relocations regardless of whether or not we are executing from\r
b .Lreloc_loop\r
.Lreloc_done:\r
\r
- // Do early platform specific actions\r
- bl ASM_PFX(ArmPlatformPeiBootAction)\r
+ bl ASM_PFX(DiscoverDramFromDt)\r
\r
// Get ID of this CPU in Multicore system\r
bl ASM_PFX(ArmReadMpidr)\r
ldr x2, PcdGet64 (PcdSystemMemorySize)\r
sub x2, x2, #1\r
add x1, x1, x2 // x1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize\r
- adr x2, mSystemMemoryEnd\r
- str x1, [x2]\r
\r
// Calculate Top of the Firmware Device\r
ldr x2, PcdGet64 (PcdFdBaseAddress)\r
- ldr w3, PcdGet32 (PcdFdSize)\r
- sub x3, x3, #1\r
+ MOV32 (w3, FixedPcdGet32 (PcdFdSize) - 1)\r
add x3, x3, x2 // x3 = FdTop = PcdFdBaseAddress + PcdFdSize\r
\r
// UEFI Memory Size (stacks are allocated in this region)\r
- LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), x4)\r
+ MOV32 (x4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize))\r
\r
//\r
// Reserve the memory for the UEFI region (contain stacks on its top)\r
_SetupOverflowStack:\r
// Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE\r
// aligned (4KB)\r
- LoadConstantToReg (EFI_PAGE_MASK, x21)\r
- and x21, x21, x1\r
- sub x1, x1, x21\r
+ and x1, x1, ~EFI_PAGE_MASK\r
\r
_GetBaseUefiMemory:\r
// Calculate the Base of the UEFI Memory\r
\r
_GetStackBase:\r
// r1 = The top of the Mpcore Stacks\r
+ mov sp, x1\r
+\r
// Stack for the primary core = PrimaryCoreStack\r
- LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), x2)\r
+ MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))\r
sub x22, x1, x2\r
\r
- // Stack for the secondary core = Number of Cores - 1\r
- LoadConstantToReg (FixedPcdGet32(PcdCoreCount), x0)\r
- sub x0, x0, #1\r
- LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), x1)\r
- mul x1, x1, x0\r
- sub x22, x22, x1\r
-\r
- // x22 = The base of the MpCore Stacks (primary stack & secondary stacks)\r
- mov x0, x22\r
- mov x1, x20\r
- //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)\r
- LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), x2)\r
- LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), x3)\r
- bl ASM_PFX(ArmPlatformStackSet)\r
-\r
- // Is it the Primary Core ?\r
- mov x0, x10\r
- bl ASM_PFX(ArmPlatformIsPrimaryCore)\r
- cmp x0, #1\r
- bne _PrepareArguments\r
-\r
-_PrepareArguments:\r
mov x0, x20\r
mov x1, x21\r
mov x2, x22\r
\r
- // Move sec startup address into a data register\r
- // Ensure we're jumping to FV version of the code (not boot remapped alias)\r
- ldr x4, StartupAddr\r
+ // Set the frame pointer to NULL so any backtraces terminate here\r
+ mov x29, xzr\r
\r
// Jump to PrePiCore C code\r
// x0 = MpId\r
// x1 = UefiMemoryBase\r
// x2 = StacksBase\r
- blr x4\r
+ bl ASM_PFX(CEntryPoint)\r
\r
_NeverReturn:\r
b _NeverReturn\r
+\r
+// VOID\r
+// DiscoverDramFromDt (\r
+// VOID *DeviceTreeBaseAddress, // passed by loader in x0\r
+// VOID *ImageBase // passed by FDF trampoline in x1\r
+// );\r
+ASM_PFX(DiscoverDramFromDt):\r
+ //\r
+ // If we are booting from RAM using the Linux kernel boot protocol, x0 will\r
+ // point to the DTB image in memory. Otherwise, use the default value defined\r
+ // by the platform.\r
+ //\r
+ cbnz x0, 0f\r
+ ldr x0, PcdGet64 (PcdDeviceTreeInitialBaseAddress)\r
+\r
+0:mov x29, x30 // preserve LR\r
+ mov x28, x0 // preserve DTB pointer\r
+ mov x27, x1 // preserve base of image pointer\r
+\r
+ //\r
+ // The base of the runtime image has been preserved in x1. Check whether\r
+ // the expected magic number can be found in the header.\r
+ //\r
+ ldr w8, .LArm64LinuxMagic\r
+ ldr w9, [x1, #0x38]\r
+ cmp w8, w9\r
+ bne .Lout\r
+\r
+ //\r
+ //\r
+ // OK, so far so good. We have confirmed that we likely have a DTB and are\r
+ // booting via the arm64 Linux boot protocol. Update the base-of-image PCD\r
+ // to the actual relocated value, and add the shift of PcdFdBaseAddress to\r
+ // PcdFvBaseAddress as well\r
+ //\r
+ adr x8, PcdGet64 (PcdFdBaseAddress)\r
+ adr x9, PcdGet64 (PcdFvBaseAddress)\r
+ ldr x6, [x8]\r
+ ldr x7, [x9]\r
+ sub x7, x7, x6\r
+ add x7, x7, x1\r
+ str x1, [x8]\r
+ str x7, [x9]\r
+\r
+ //\r
+ // Discover the memory size and offset from the DTB, and record in the\r
+ // respective PCDs. This will also return false if a corrupt DTB is\r
+ // encountered. Since we are calling a C function, use the window at the\r
+ // beginning of the FD image as a temp stack.\r
+ //\r
+ adr x1, PcdGet64 (PcdSystemMemoryBase)\r
+ adr x2, PcdGet64 (PcdSystemMemorySize)\r
+ mov sp, x7\r
+ bl FindMemnode\r
+ cbz x0, .Lout\r
+\r
+ //\r
+ // Copy the DTB to the slack space right after the 64 byte arm64/Linux style\r
+ // image header at the base of this image (defined in the FDF), and record the\r
+ // pointer in PcdDeviceTreeInitialBaseAddress.\r
+ //\r
+ adr x8, PcdGet64 (PcdDeviceTreeInitialBaseAddress)\r
+ add x27, x27, #0x40\r
+ str x27, [x8]\r
+\r
+ mov x0, x27\r
+ mov x1, x28\r
+ bl CopyFdt\r
+\r
+.Lout:\r
+ ret x29\r
+\r
+.LArm64LinuxMagic:\r
+ .byte 0x41, 0x52, 0x4d, 0x64\r
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