ArmVirtPkg/Library/ArmXenRelocatablePlatformLib/ARM/RelocatableVirtHelper.S

   1 #
   2 #  Copyright (c) 2011-2013, ARM Limited. All rights reserved.
   3 #  Copyright (c) 2014, Linaro Limited. All rights reserved.
   4 #
   5 #  This program and the accompanying materials
   6 #  are licensed and made available under the terms and conditions of the BSD License
   7 #  which accompanies this distribution.  The full text of the license may be found at
   8 #  http://opensource.org/licenses/bsd-license.php
   9 #
  10 #  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 #  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 #
  13 #
  14
  15 #include <AsmMacroIoLib.h>
  16 #include <Base.h>
  17 #include <Library/ArmLib.h>
  18 #include <Library/PcdLib.h>
  19 #include <AutoGen.h>
  20
  21 .text
  22 .align 2
  23
  24 GCC_ASM_EXPORT(ArmPlatformPeiBootAction)
  25 GCC_ASM_EXPORT(ArmPlatformIsPrimaryCore)
  26 GCC_ASM_EXPORT(ArmPlatformGetPrimaryCoreMpId)
  27 GCC_ASM_EXPORT(ArmPlatformGetCorePosition)
  28 GCC_ASM_EXPORT(ArmGetPhysAddrTop)
  29
  30 GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdArmPrimaryCore)
  31 GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask)
  32 GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdCoreCount)
  33
  34 .LArm32LinuxMagic:
  35   .byte   0x18, 0x28, 0x6f, 0x01
  36
  37 ASM_PFX(ArmPlatformPeiBootAction):
  38   mov   r11, r14            // preserve LR
  39   mov   r10, r0             // preserve DTB pointer
  40   mov   r9, r1              // preserve base of image pointer
  41
  42   //
  43   // If we are booting from RAM using the Linux kernel boot protocol, r0 will
  44   // point to the DTB image in memory. Otherwise, we are just coming out of
  45   // reset, and r0 will be 0.
  46   //
  47   teq   r0, #0
  48   beq   .Lout
  49
  50   //
  51   // The base of the runtime image has been preserved in r1. Check whether
  52   // the expected magic number can be found in the header.
  53   //
  54   ldr   r8, .LArm32LinuxMagic
  55   ldr   r7, [r1, #0x24]
  56   cmp   r7, r8
  57   bne   .Lout
  58
  59   //
  60   //
  61   // OK, so far so good. We have confirmed that we likely have a DTB and are
  62   // booting via the ARM Linux boot protocol. Update the base-of-image PCD
  63   // to the actual relocated value, and add the shift of PcdFdBaseAddress to
  64   // PcdFvBaseAddress as well
  65   //
  66   ldr   r8, =PcdGet64 (PcdFdBaseAddress)
  67   ldr   r7, =PcdGet64 (PcdFvBaseAddress)
  68   ldr   r6, [r8]
  69   ldr   r5, [r7]
  70   sub   r5, r5, r6
  71   add   r5, r5, r1
  72   str   r1, [r8]
  73   str   r5, [r7]
  74
  75   //
  76   // Discover the memory size and offset from the DTB, and record in the
  77   // respective PCDs. This will also return false if a corrupt DTB is
  78   // encountered. Since we are calling a C function, use the window at the
  79   // beginning of the FD image as a temp stack.
  80   //
  81   ldr   r1, =PcdGet64 (PcdSystemMemorySize)
  82   ldr   r2, =PcdGet64 (PcdSystemMemoryBase)
  83   mov   sp, r5
  84   bl    FindMemnode
  85   teq   r0, #0
  86   beq   .Lout
  87
  88   //
  89   // Copy the DTB to the slack space right after the 64 byte arm64/Linux style
  90   // image header at the base of this image (defined in the FDF), and record the
  91   // pointer in PcdDeviceTreeInitialBaseAddress.
  92   //
  93   ldr   r8, =PcdGet64 (PcdDeviceTreeInitialBaseAddress)
  94   add   r9, r9, #0x40
  95   str   r9, [r8]
  96
  97   mov   r0, r9
  98   mov   r1, r10
  99   bl    CopyFdt
 100
 101 .Lout:
 102   bx    r11
 103
 104 //UINTN
 105 //ArmPlatformGetPrimaryCoreMpId (
 106 //  VOID
 107 //  );
 108 ASM_PFX(ArmPlatformGetPrimaryCoreMpId):
 109   LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCore, r0)
 110   ldr    r0, [r0]
 111   bx     lr
 112
 113 //UINTN
 114 //ArmPlatformIsPrimaryCore (
 115 //  IN UINTN MpId
 116 //  );
 117 ASM_PFX(ArmPlatformIsPrimaryCore):
 118   mov   r0, #1
 119   bx    lr
 120
 121 //UINTN
 122 //ArmPlatformGetCorePosition (
 123 //  IN UINTN MpId
 124 //  );
 125 // With this function: CorePos = (ClusterId * 4) + CoreId
 126 ASM_PFX(ArmPlatformGetCorePosition):
 127   and   r1, r0, #ARM_CORE_MASK
 128   and   r0, r0, #ARM_CLUSTER_MASK
 129   add   r0, r1, r0, LSR #6
 130   bx    lr
 131
 132 //EFI_PHYSICAL_ADDRESS
 133 //GetPhysAddrTop (
 134 //  VOID
 135 //  );
 136 ASM_PFX(ArmGetPhysAddrTop):
 137   mov   r0, #0x00000000
 138   mov   r1, #0x10000
 139   bx    lr
 140