| /* SPDX-License-Identifier: GPL-2.0 */ |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-compat.h> |
| |
| /* unsigned long xmon_mfspr(sprn, default_value) */ |
| _GLOBAL(xmon_mfspr) |
| LOAD_REG_ADDR(r5, .Lmfspr_table) |
| b xmon_mxspr |
| |
| /* void xmon_mtspr(sprn, new_value) */ |
| _GLOBAL(xmon_mtspr) |
| LOAD_REG_ADDR(r5, .Lmtspr_table) |
| b xmon_mxspr |
| |
| /* |
| * r3 = sprn |
| * r4 = default or new value |
| * r5 = table base |
| */ |
| xmon_mxspr: |
| /* |
| * To index into the table of mxsprs we need: |
| * i = (sprn & 0x3ff) * 8 |
| * or using rwlinm: |
| * i = (sprn << 3) & (0x3ff << 3) |
| */ |
| rlwinm r3, r3, 3, 0x3ff << 3 |
| add r5, r5, r3 |
| mtctr r5 |
| mr r3, r4 /* put default_value in r3 for mfspr */ |
| bctr |
| |
| .Lmfspr_table: |
| spr = 0 |
| .rept 1024 |
| mfspr r3, spr |
| blr |
| spr = spr + 1 |
| .endr |
| |
| .Lmtspr_table: |
| spr = 0 |
| .rept 1024 |
| mtspr spr, r4 |
| blr |
| spr = spr + 1 |
| .endr |
