arch/powerpc/platforms/powernv/copy-paste.h

   1 /*
   2  * Copyright 2016-17 IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9 #include <asm/ppc-opcode.h>
  10
  11 #define CR0_SHIFT       28
  12 #define CR0_MASK        0xF
  13 /*
  14  * Copy/paste instructions:
  15  *
  16  *      copy RA,RB
  17  *              Copy contents of address (RA) + effective_address(RB)
  18  *              to internal copy-buffer.
  19  *
  20  *      paste RA,RB
  21  *              Paste contents of internal copy-buffer to the address
  22  *              (RA) + effective_address(RB)
  23  */
  24 static inline int vas_copy(void *crb, int offset)
  25 {
  26         asm volatile(PPC_COPY(%0, %1)";"
  27                 :
  28                 : "b" (offset), "b" (crb)
  29                 : "memory");
  30
  31         return 0;
  32 }
  33
  34 static inline int vas_paste(void *paste_address, int offset)
  35 {
  36         u32 cr;
  37
  38         cr = 0;
  39         asm volatile(PPC_PASTE(%1, %2)";"
  40                 "mfocrf %0, 0x80;"
  41                 : "=r" (cr)
  42                 : "b" (offset), "b" (paste_address)
  43                 : "memory", "cr0");
  44
  45         return (cr >> CR0_SHIFT) & CR0_MASK;
  46 }