ArmVirtPkg: clean up assembly source files

[mirror_edk2.git] / ArmVirtPkg / Library / ArmXenRelocatablePlatformLib / ARM / RelocatableVirtHelper.S

#\r
#  Copyright (c) 2011-2013, ARM Limited. All rights reserved.\r
#  Copyright (c) 2014-2016, 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
#  which accompanies this distribution.  The full text of the license may be found at\r
#  http://opensource.org/licenses/bsd-license.php\r
#\r
#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
#\r
#\r
\r
#include <AsmMacroIoLib.h>\r
#include <Library/ArmLib.h>\r
\r
ASM_FUNC(ArmPlatformPeiBootAction)\r
  mov   r11, r14            // preserve LR\r
  mov   r10, r0             // preserve DTB pointer\r
  mov   r9, r1              // preserve base of image pointer\r
\r
  //\r
  // If we are booting from RAM using the Linux kernel boot protocol, r0 will\r
  // point to the DTB image in memory. Otherwise, we are just coming out of\r
  // reset, and r0 will be 0.\r
  //\r
  teq   r0, #0\r
  beq   .Lout\r
\r
  //\r
  // The base of the runtime image has been preserved in r1. Check whether\r
  // the expected magic number can be found in the header.\r
  //\r
  ldr   r8, .LArm32LinuxMagic\r
  ldr   r7, [r1, #0x24]\r
  cmp   r7, r8\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 ARM 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
  ADRL  (r8, PcdGet64 (PcdFdBaseAddress))\r
  ADRL  (r7, PcdGet64 (PcdFvBaseAddress))\r
  ldr   r6, [r8]\r
  ldr   r5, [r7]\r
  sub   r5, r5, r6\r
  add   r5, r5, r1\r
  str   r1, [r8]\r
  str   r5, [r7]\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
  ADRL  (r1, PcdGet64 (PcdSystemMemoryBase))\r
  ADRL  (r2, PcdGet64 (PcdSystemMemorySize))\r
  mov   sp, r5\r
  bl    FindMemnode\r
  teq   r0, #0\r
  beq   .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
  ADRL  (r8, PcdGet64 (PcdDeviceTreeInitialBaseAddress))\r
  add   r9, r9, #0x40\r
  str   r9, [r8]\r
\r
  mov   r0, r9\r
  mov   r1, r10\r
  bl    CopyFdt\r
\r
.Lout:\r
  bx    r11\r
\r
.LArm32LinuxMagic:\r
  .byte   0x18, 0x28, 0x6f, 0x01\r
\r
//UINTN\r
//ArmPlatformGetPrimaryCoreMpId (\r
//  VOID\r
//  );\r
ASM_FUNC(ArmPlatformGetPrimaryCoreMpId)\r
  MOV32  (r0, FixedPcdGet32 (PcdArmPrimaryCore))\r
  bx     lr\r
\r
//UINTN\r
//ArmPlatformIsPrimaryCore (\r
//  IN UINTN MpId\r
//  );\r
ASM_FUNC(ArmPlatformIsPrimaryCore)\r
  mov   r0, #1\r
  bx    lr\r
\r
//UINTN\r
//ArmPlatformGetCorePosition (\r
//  IN UINTN MpId\r
//  );\r
// With this function: CorePos = (ClusterId * 4) + CoreId\r
ASM_FUNC(ArmPlatformGetCorePosition)\r
  and   r1, r0, #ARM_CORE_MASK\r
  and   r0, r0, #ARM_CLUSTER_MASK\r
  add   r0, r1, r0, LSR #6\r
  bx    lr\r
\r
//EFI_PHYSICAL_ADDRESS\r
//GetPhysAddrTop (\r
//  VOID\r
//  );\r
ASM_FUNC(ArmGetPhysAddrTop)\r
  mov   r0, #0x00000000\r
  mov   r1, #0x10000\r
  bx    lr\r
\r