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

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright 2016-17 IBM Corp.
   4  */
   5 #include <asm/ppc-opcode.h>
   6 #include <asm/reg.h>
   7
   8 /*
   9  * Copy/paste instructions:
  10  *
  11  *      copy RA,RB
  12  *              Copy contents of address (RA) + effective_address(RB)
  13  *              to internal copy-buffer.
  14  *
  15  *      paste RA,RB
  16  *              Paste contents of internal copy-buffer to the address
  17  *              (RA) + effective_address(RB)
  18  */
  19 static inline int vas_copy(void *crb, int offset)
  20 {
  21         asm volatile(PPC_COPY(%0, %1)";"
  22                 :
  23                 : "b" (offset), "b" (crb)
  24                 : "memory");
  25
  26         return 0;
  27 }
  28
  29 static inline int vas_paste(void *paste_address, int offset)
  30 {
  31         u32 cr;
  32
  33         cr = 0;
  34         asm volatile(PPC_PASTE(%1, %2)";"
  35                 "mfocrf %0, 0x80;"
  36                 : "=r" (cr)
  37                 : "b" (offset), "b" (paste_address)
  38                 : "memory", "cr0");
  39
  40         /* We mask with 0xE to ignore SO */
  41         return (cr >> CR0_SHIFT) & 0xE;
  42 }