LXR linux/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 */
  19static 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
  29static 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}
  43