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   SPDX-License-Identifier: BSD-2-Clause-Patent
   9
  10 **/
  11
  12 #ifndef ASM_MACRO_IO_LIBV8_H_
  13 #define ASM_MACRO_IO_LIBV8_H_
  14
  15 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
  16 // This only selects between EL1 and EL2, else we die.
  17 // Provide the Macro with a safe temp xreg to use.
  18 #define EL1_OR_EL2(SAFE_XREG)        \
  19         mrs    SAFE_XREG, CurrentEL ;\
  20         cmp    SAFE_XREG, #0x8      ;\
  21         b.gt   .                    ;\
  22         b.eq   2f                   ;\
  23         cbnz   SAFE_XREG, 1f        ;\
  24         b      .                    ;// We should never get here
  25
  26 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1
  27 // This only selects between EL1 and EL2 and EL3, else we die.
  28 // Provide the Macro with a safe temp xreg to use.
  29 #define EL1_OR_EL2_OR_EL3(SAFE_XREG) \
  30         mrs    SAFE_XREG, CurrentEL ;\
  31         cmp    SAFE_XREG, #0x8      ;\
  32         b.gt   3f                   ;\
  33         b.eq   2f                   ;\
  34         cbnz   SAFE_XREG, 1f        ;\
  35         b      .                    ;// We should never get here
  36
  37 #define _ASM_FUNC(Name, Section)    \
  38   .global   Name                  ; \
  39   .section  #Section, "ax"        ; \
  40   .type     Name, %function       ; \
  41   Name:
  42
  43 #define ASM_FUNC(Name)  _ASM_FUNC(ASM_PFX(Name), .text. ## Name)
  44
  45 #define MOV32(Reg, Val)                   \
  46   movz      Reg, (Val) >> 16, lsl #16   ; \
  47   movk      Reg, (Val) & 0xffff
  48
  49 #define MOV64(Reg, Val)                             \
  50   movz      Reg, (Val) >> 48, lsl #48             ; \
  51   movk      Reg, ((Val) >> 32) & 0xffff, lsl #32  ; \
  52   movk      Reg, ((Val) >> 16) & 0xffff, lsl #16  ; \
  53   movk      Reg, (Val) & 0xffff
  54
  55 #endif // ASM_MACRO_IO_LIBV8_H_