LXR linux/arch/powerpc/xmon/spr

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#include <asm/ppc_asm.h>
   3#include <asm/asm-compat.h>
   4
   5/* unsigned long xmon_mfspr(sprn, default_value) */
   6_GLOBAL(xmon_mfspr)
   7        PPC_LL  r5, .Lmfspr_table@got(r2)
   8        b       xmon_mxspr
   9
  10/* void xmon_mtspr(sprn, new_value) */
  11_GLOBAL(xmon_mtspr)
  12        PPC_LL  r5, .Lmtspr_table@got(r2)
  13        b       xmon_mxspr
  14
  15/*
  16 * r3 = sprn
  17 * r4 = default or new value
  18 * r5 = table base
  19 */
  20xmon_mxspr:
  21        /*
  22         * To index into the table of mxsprs we need:
  23         *  i = (sprn & 0x3ff) * 8
  24         * or using rwlinm:
  25         *  i = (sprn << 3) & (0x3ff << 3)
  26         */
  27        rlwinm  r3, r3, 3, 0x3ff << 3
  28        add     r5, r5, r3
  29        mtctr   r5
  30        mr      r3, r4 /* put default_value in r3 for mfspr */
  31        bctr
  32
  33.Lmfspr_table:
  34        spr = 0
  35        .rept   1024
  36        mfspr   r3, spr
  37        blr
  38        spr = spr + 1
  39        .endr
  40
  41.Lmtspr_table:
  42        spr = 0
  43        .rept   1024
  44        mtspr   spr, r4
  45        blr
  46        spr = spr + 1
  47        .endr
  48