payloads/libpayload/arch/arm/asmlib.h

   1 /*
   2  *  arch/arm/asmlib.h
   3  *
   4  *  Adapted from Linux arch/arm/include/assembler.h
   5  *
   6  *  Copyright (C) 1996-2000 Russell King
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  *  This file contains arm architecture specific defines
  13  *  for the different processors.
  14  *
  15  *  Do not include any C declarations in this file - it is included by
  16  *  assembler source.
  17  */
  18
  19 /*
  20  * WARNING: This file is *only* meant for memcpy.S and friends which were copied
  21  * from Linux and require some weird macros. It does unspeakable things like
  22  * redefining "push", so do *not* try to turn it into a general assembly macro
  23  * file, and keep it out of global include directories.
  24  */
  25
  26 #ifndef __ARM_ASMLIB_H__
  27 #define __ARM_ASMLIB_H__
  28
  29 /*
  30  * Endian independent macros for shifting bytes within registers.
  31  */
  32 #ifndef __ARMEB__
  33 #define pull            lsr
  34 #define push            lsl
  35 #define get_byte_0      lsl #0
  36 #define get_byte_1      lsr #8
  37 #define get_byte_2      lsr #16
  38 #define get_byte_3      lsr #24
  39 #define put_byte_0      lsl #0
  40 #define put_byte_1      lsl #8
  41 #define put_byte_2      lsl #16
  42 #define put_byte_3      lsl #24
  43 #else
  44 #define pull            lsl
  45 #define push            lsr
  46 #define get_byte_0      lsr #24
  47 #define get_byte_1      lsr #16
  48 #define get_byte_2      lsr #8
  49 #define get_byte_3      lsl #0
  50 #define put_byte_0      lsl #24
  51 #define put_byte_1      lsl #16
  52 #define put_byte_2      lsl #8
  53 #define put_byte_3      lsl #0
  54 #endif
  55
  56 /*
  57  * Data preload for architectures that support it
  58  */
  59 #if 1   /* TODO: differentiate once libpayload supports more ARM versions */
  60 #define PLD(code...)    code
  61 #else
  62 #define PLD(code...)
  63 #endif
  64
  65 /*
  66  * This can be used to enable code to cacheline align the destination
  67  * pointer when bulk writing to memory. Linux doesn't enable this except
  68  * for the "Feroceon" processor, so we better just leave it out.
  69  */
  70 #define CALGN(code...)
  71
  72 #endif  /* __ARM_ASMLIB_H */