diff options
Diffstat (limited to 'arch/ia64/lib')
| -rw-r--r-- | arch/ia64/lib/flush.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/ia64/lib/flush.S b/arch/ia64/lib/flush.S index 2a0d27f2f21..1d8c8886006 100644 --- a/arch/ia64/lib/flush.S +++ b/arch/ia64/lib/flush.S @@ -60,3 +60,58 @@ GLOBAL_ENTRY(flush_icache_range) mov ar.lc=r3 // restore ar.lc br.ret.sptk.many rp END(flush_icache_range) + + /* + * clflush_cache_range(start,size) + * + * Flush cache lines from start to start+size-1. + * + * Must deal with range from start to start+size-1 but nothing else + * (need to be careful not to touch addresses that may be + * unmapped). + * + * Note: "in0" and "in1" are preserved for debugging purposes. + */ + .section .kprobes.text,"ax" +GLOBAL_ENTRY(clflush_cache_range) + + .prologue + alloc r2=ar.pfs,2,0,0,0 + movl r3=ia64_cache_stride_shift + mov r21=1 + add r22=in1,in0 + ;; + ld8 r20=[r3] // r20: stride shift + sub r22=r22,r0,1 // last byte address + ;; + shr.u r23=in0,r20 // start / (stride size) + shr.u r22=r22,r20 // (last byte address) / (stride size) + shl r21=r21,r20 // r21: stride size of the i-cache(s) + ;; + sub r8=r22,r23 // number of strides - 1 + shl r24=r23,r20 // r24: addresses for "fc" = + // "start" rounded down to stride + // boundary + .save ar.lc,r3 + mov r3=ar.lc // save ar.lc + ;; + + .body + mov ar.lc=r8 + ;; + /* + * 32 byte aligned loop, even number of (actually 2) bundles + */ +.Loop_fc: + fc r24 // issuable on M0 only + add r24=r21,r24 // we flush "stride size" bytes per iteration + nop.i 0 + br.cloop.sptk.few .Loop_fc + ;; + sync.i + ;; + srlz.i + ;; + mov ar.lc=r3 // restore ar.lc + br.ret.sptk.many rp +END(clflush_cache_range) |