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| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-09-11 04:34:46 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-09-11 04:34:46 -0300 |
| commit | 863981e96738983919de841ec669e157e6bdaeb0 (patch) | |
| tree | d6d89a12e7eb8017837c057935a2271290907f76 /arch/powerpc/xmon/spr_access.S | |
| parent | 8dec7c70575785729a6a9e6719a955e9c545bcab (diff) | |
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'arch/powerpc/xmon/spr_access.S')
| -rw-r--r-- | arch/powerpc/xmon/spr_access.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/spr_access.S b/arch/powerpc/xmon/spr_access.S new file mode 100644 index 000000000..84ad74213 --- /dev/null +++ b/arch/powerpc/xmon/spr_access.S @@ -0,0 +1,45 @@ +#include <asm/ppc_asm.h> + +/* unsigned long xmon_mfspr(sprn, default_value) */ +_GLOBAL(xmon_mfspr) + ld r5, .Lmfspr_table@got(r2) + b xmon_mxspr + +/* void xmon_mtspr(sprn, new_value) */ +_GLOBAL(xmon_mtspr) + ld r5, .Lmtspr_table@got(r2) + 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 |