ArmPkg/Include/AsmMacroIoLibV8.h

   1 /** @file
   2   Macros to work around lack of Clang support for LDR register, =expr
   3
   4   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   5   Portions copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
   6   Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
   7
   8   This program and the accompanying materials
   9   are licensed and made available under the terms and conditions of the BSD License
  10   which accompanies this distribution.  The full text of the license may be found at
  11   http://opensource.org/licenses/bsd-license.php
  12
  13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16 **/
  17
  18
  19 #ifndef __MACRO_IO_LIBV8_H__
  20 #define __MACRO_IO_LIBV8_H__
  21
  22 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
  23 // This only selects between EL1 and EL2, else we die.
  24 // Provide the Macro with a safe temp xreg to use.
  25 #define EL1_OR_EL2(SAFE_XREG)        \
  26         mrs    SAFE_XREG, CurrentEL ;\
  27         cmp    SAFE_XREG, #0x8      ;\
  28         b.gt   .                    ;\
  29         b.eq   2f                   ;\
  30         cbnz   SAFE_XREG, 1f        ;\
  31         b      .                    ;// We should never get here
  32
  33
  34 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
  35 // This only selects between EL1 and EL2 and EL3, else we die.
  36 // Provide the Macro with a safe temp xreg to use.
  37 #define EL1_OR_EL2_OR_EL3(SAFE_XREG) \
  38         mrs    SAFE_XREG, CurrentEL ;\
  39         cmp    SAFE_XREG, #0x8      ;\
  40         b.gt   3f                   ;\
  41         b.eq   2f                   ;\
  42         cbnz   SAFE_XREG, 1f        ;\
  43         b      .                    ;// We should never get here
  44
  45 #define _ASM_FUNC(Name, Section)    \
  46   .global   Name                  ; \
  47   .section  #Section, "ax"        ; \
  48   .type     Name, %function       ; \
  49   Name:
  50
  51 #define ASM_FUNC(Name)            _ASM_FUNC(ASM_PFX(Name), .text. ## Name)
  52
  53 #define MOV32(Reg, Val)                   \
  54   movz      Reg, (Val) >> 16, lsl #16   ; \
  55   movk      Reg, (Val) & 0xffff
  56
  57 #define MOV64(Reg, Val)                             \
  58   movz      Reg, (Val) >> 48, lsl #48             ; \
  59   movk      Reg, ((Val) >> 32) & 0xffff, lsl #32  ; \
  60   movk      Reg, ((Val) >> 16) & 0xffff, lsl #16  ; \
  61   movk      Reg, (Val) & 0xffff
  62
  63 #endif // __MACRO_IO_LIBV8_H__