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 LOAD_REG_ADDR(r5, .Lmfspr_table) 8 b xmon_mxspr 9 10 /* void xmon_mtspr(sprn, new_value) */ 11 _GLOBAL(xmon_mtspr) 12 LOAD_REG_ADDR(r5, .Lmtspr_table) 13 b xmon_mxspr 14 15 /* 16 * r3 = sprn 17 * r4 = default or new value 18 * r5 = table base 19 */ 20 xmon_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
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