# | |
# Copyright (c) 2011-2013, ARM Limited. All rights reserved. | |
# Copyright (c) 2016, Linaro Limited. All rights reserved. | |
# | |
# This program and the accompanying materials | |
# are licensed and made available under the terms and conditions of the BSD License | |
# which accompanies this distribution. The full text of the license may be found at | |
# http://opensource.org/licenses/bsd-license.php | |
# | |
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
# | |
# | |
#include <AsmMacroIoLibV8.h> | |
#include <Library/ArmLib.h> | |
// VOID | |
// ArmPlatformPeiBootAction ( | |
// VOID *DeviceTreeBaseAddress, // passed by loader in x0 | |
// VOID *ImageBase // passed by FDF trampoline in x1 | |
// ); | |
ASM_FUNC(ArmPlatformPeiBootAction) | |
mov x29, x30 // preserve LR | |
mov x28, x0 // preserve DTB pointer | |
mov x27, x1 // preserve base of image pointer | |
// | |
// If we are booting from RAM using the Linux kernel boot protocol, x0 will | |
// point to the DTB image in memory. Otherwise, we are just coming out of | |
// reset, and x0 will be 0. | |
// | |
cbz x0, .Lout | |
// | |
// The base of the runtime image has been preserved in x1. Check whether | |
// the expected magic number can be found in the header. | |
// | |
ldr w8, .LArm64LinuxMagic | |
ldr w9, [x1, #0x38] | |
cmp w8, w9 | |
bne .Lout | |
// | |
// | |
// OK, so far so good. We have confirmed that we likely have a DTB and are | |
// booting via the arm64 Linux boot protocol. Update the base-of-image PCD | |
// to the actual relocated value, and add the shift of PcdFdBaseAddress to | |
// PcdFvBaseAddress as well | |
// | |
adr x8, PcdGet64 (PcdFdBaseAddress) | |
adr x9, PcdGet64 (PcdFvBaseAddress) | |
ldr x6, [x8] | |
ldr x7, [x9] | |
sub x7, x7, x6 | |
add x7, x7, x1 | |
str x1, [x8] | |
str x7, [x9] | |
// | |
// Discover the memory size and offset from the DTB, and record in the | |
// respective PCDs. This will also return false if a corrupt DTB is | |
// encountered. Since we are calling a C function, use the window at the | |
// beginning of the FD image as a temp stack. | |
// | |
adr x1, PcdGet64 (PcdSystemMemoryBase) | |
adr x2, PcdGet64 (PcdSystemMemorySize) | |
mov sp, x7 | |
bl FindMemnode | |
cbz x0, .Lout | |
// | |
// Copy the DTB to the slack space right after the 64 byte arm64/Linux style | |
// image header at the base of this image (defined in the FDF), and record the | |
// pointer in PcdDeviceTreeInitialBaseAddress. | |
// | |
adr x8, PcdGet64 (PcdDeviceTreeInitialBaseAddress) | |
add x27, x27, #0x40 | |
str x27, [x8] | |
mov x0, x27 | |
mov x1, x28 | |
bl CopyFdt | |
.Lout: | |
ret x29 | |
.LArm64LinuxMagic: | |
.byte 0x41, 0x52, 0x4d, 0x64 | |
//UINTN | |
//ArmPlatformGetPrimaryCoreMpId ( | |
// VOID | |
// ); | |
ASM_FUNC(ArmPlatformGetPrimaryCoreMpId) | |
MOV32 (w0, FixedPcdGet32 (PcdArmPrimaryCore)) | |
ret | |
//UINTN | |
//ArmPlatformIsPrimaryCore ( | |
// IN UINTN MpId | |
// ); | |
ASM_FUNC(ArmPlatformIsPrimaryCore) | |
mov x0, #1 | |
ret | |
//UINTN | |
//ArmPlatformGetCorePosition ( | |
// IN UINTN MpId | |
// ); | |
// With this function: CorePos = (ClusterId * 4) + CoreId | |
ASM_FUNC(ArmPlatformGetCorePosition) | |
and x1, x0, #ARM_CORE_MASK | |
and x0, x0, #ARM_CLUSTER_MASK | |
add x0, x1, x0, LSR #6 | |
ret | |
//EFI_PHYSICAL_ADDRESS | |
//GetPhysAddrTop ( | |
// VOID | |
// ); | |
ASM_FUNC(ArmGetPhysAddrTop) | |
mrs x0, id_aa64mmfr0_el1 | |
adr x1, .LPARanges | |
and x0, x0, #7 | |
ldrb w1, [x1, x0] | |
mov x0, #1 | |
lsl x0, x0, x1 | |
ret | |
// | |
// Bits 0..2 of the AA64MFR0_EL1 system register encode the size of the | |
// physical address space support on this CPU: | |
// 0 == 32 bits, 1 == 36 bits, etc etc | |
// 6 and 7 are reserved | |
// | |
.LPARanges: | |
.byte 32, 36, 40, 42, 44, 48, -1, -1 | |
ASM_FUNCTION_REMOVE_IF_UNREFERENCED |