LXR linux/tools/testing/selftests/powerpc/nx-gzip/include/copy-paste.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3/* From asm-compat.h */
   4#define __stringify_in_c(...)   #__VA_ARGS__
   5#define stringify_in_c(...)     __stringify_in_c(__VA_ARGS__) " "
   6
   7/*
   8 * Macros taken from arch/powerpc/include/asm/ppc-opcode.h and other
   9 * header files.
  10 */
  11#define ___PPC_RA(a)    (((a) & 0x1f) << 16)
  12#define ___PPC_RB(b)    (((b) & 0x1f) << 11)
  13
  14#define PPC_INST_COPY                   0x7c20060c
  15#define PPC_INST_PASTE                  0x7c20070d
  16
  17#define PPC_COPY(a, b)          stringify_in_c(.long PPC_INST_COPY | \
  18                                                ___PPC_RA(a) | ___PPC_RB(b))
  19#define PPC_PASTE(a, b)         stringify_in_c(.long PPC_INST_PASTE | \
  20                                                ___PPC_RA(a) | ___PPC_RB(b))
  21#define CR0_SHIFT       28
  22#define CR0_MASK        0xF
  23/*
  24 * Copy/paste instructions:
  25 *
  26 *      copy RA,RB
  27 *              Copy contents of address (RA) + effective_address(RB)
  28 *              to internal copy-buffer.
  29 *
  30 *      paste RA,RB
  31 *              Paste contents of internal copy-buffer to the address
  32 *              (RA) + effective_address(RB)
  33 */
  34static inline int vas_copy(void *crb, int offset)
  35{
  36        asm volatile(PPC_COPY(%0, %1)";"
  37                :
  38                : "b" (offset), "b" (crb)
  39                : "memory");
  40
  41        return 0;
  42}
  43
  44static inline int vas_paste(void *paste_address, int offset)
  45{
  46        __u32 cr;
  47
  48        cr = 0;
  49        asm volatile(PPC_PASTE(%1, %2)";"
  50                "mfocrf %0, 0x80;"
  51                : "=r" (cr)
  52                : "b" (offset), "b" (paste_address)
  53                : "memory", "cr0");
  54
  55        return (cr >> CR0_SHIFT) & CR0_MASK;
  56}
  57