mirror of https://github.com/acidanthera/audk.git
124 lines
3.3 KiB
ArmAsm
124 lines
3.3 KiB
ArmAsm
#
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# Copyright (c) 2011-2013, ARM Limited. All rights reserved.
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# Copyright (c) 2014-2016, Linaro Limited. All rights reserved.
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#
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#include <AsmMacroIoLib.h>
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#include <Library/ArmLib.h>
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ASM_FUNC(ArmPlatformPeiBootAction)
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mov r11, r14 // preserve LR
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mov r10, r0 // preserve DTB pointer
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mov r9, r1 // preserve base of image pointer
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//
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// If we are booting from RAM using the Linux kernel boot protocol, r0 will
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// point to the DTB image in memory. Otherwise, we are just coming out of
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// reset, and r0 will be 0.
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//
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teq r0, #0
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beq .Lout
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//
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// The base of the runtime image has been preserved in r1. Check whether
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// the expected magic number can be found in the header.
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//
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ldr r8, .LArm32LinuxMagic
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ldr r7, [r1, #0x24]
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cmp r7, r8
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bne .Lout
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//
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//
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// OK, so far so good. We have confirmed that we likely have a DTB and are
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// booting via the ARM Linux boot protocol. Update the base-of-image PCD
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// to the actual relocated value, and add the shift of PcdFdBaseAddress to
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// PcdFvBaseAddress as well
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//
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ADRL (r8, PcdGet64 (PcdFdBaseAddress))
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ADRL (r7, PcdGet64 (PcdFvBaseAddress))
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ldr r6, [r8]
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ldr r5, [r7]
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sub r5, r5, r6
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add r5, r5, r1
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str r1, [r8]
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str r5, [r7]
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//
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// Discover the memory size and offset from the DTB, and record in the
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// respective PCDs. This will also return false if a corrupt DTB is
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// encountered. Since we are calling a C function, use the window at the
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// beginning of the FD image as a temp stack.
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//
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ADRL (r1, PcdGet64 (PcdSystemMemoryBase))
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ADRL (r2, PcdGet64 (PcdSystemMemorySize))
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mov sp, r5
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bl FindMemnode
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teq r0, #0
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beq .Lout
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//
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// Copy the DTB to the slack space right after the 64 byte arm64/Linux style
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// image header at the base of this image (defined in the FDF), and record the
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// pointer in PcdDeviceTreeInitialBaseAddress.
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//
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ADRL (r8, PcdGet64 (PcdDeviceTreeInitialBaseAddress))
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add r9, r9, #0x40
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str r9, [r8]
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mov r0, r9
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mov r1, r10
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bl CopyFdt
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.Lout:
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bx r11
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.LArm32LinuxMagic:
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.byte 0x18, 0x28, 0x6f, 0x01
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//UINTN
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//ArmPlatformGetPrimaryCoreMpId (
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// VOID
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// );
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ASM_FUNC(ArmPlatformGetPrimaryCoreMpId)
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MOV32 (r0, FixedPcdGet32 (PcdArmPrimaryCore))
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bx lr
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//UINTN
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//ArmPlatformIsPrimaryCore (
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// IN UINTN MpId
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// );
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ASM_FUNC(ArmPlatformIsPrimaryCore)
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mov r0, #1
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bx lr
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//UINTN
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//ArmPlatformGetCorePosition (
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// IN UINTN MpId
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// );
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// With this function: CorePos = (ClusterId * 4) + CoreId
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ASM_FUNC(ArmPlatformGetCorePosition)
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and r1, r0, #ARM_CORE_MASK
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and r0, r0, #ARM_CLUSTER_MASK
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add r0, r1, r0, LSR #6
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bx lr
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//EFI_PHYSICAL_ADDRESS
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//GetPhysAddrTop (
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// VOID
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// );
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ASM_FUNC(ArmGetPhysAddrTop)
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mov r0, #0x00000000
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mov r1, #0x10000
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bx lr
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