patch-2_6_7-vs1_9_1_12

[linux-2.6.git] / arch / ppc / lib / string.S

diff --git a/arch/ppc/lib/string.S b/arch/ppc/lib/string.S
index 47f48c1..2b60910 100644 (file)
--- a/arch/ppc/lib/string.S
+++ b/arch/ppc/lib/string.S
@@ -436,48 +436,57 @@ _GLOBAL(__copy_tofrom_user)
 73:    stwu    r9,4(r6)
        bdnz    72b
 
+       .section __ex_table,"a"
+       .align  2
+       .long   70b,100f
+       .long   71b,101f
+       .long   72b,102f
+       .long   73b,103f
+       .text
+
 58:    srwi.   r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */
        clrlwi  r5,r5,32-LG_CACHELINE_BYTES
        li      r11,4
        beq     63f
 
-#if !defined(CONFIG_8xx)
+#ifdef CONFIG_8xx
+       /* Don't use prefetch on 8xx */
+       mtctr   r0
+53:    COPY_16_BYTES_WITHEX(0)
+       bdnz    53b
+
+#else /* not CONFIG_8xx */
        /* Here we decide how far ahead to prefetch the source */
+       li      r3,4
+       cmpwi   r0,1
+       li      r7,0
+       ble     114f
+       li      r7,1
 #if MAX_COPY_PREFETCH > 1
        /* Heuristically, for large transfers we prefetch
           MAX_COPY_PREFETCH cachelines ahead.  For small transfers
           we prefetch 1 cacheline ahead. */
        cmpwi   r0,MAX_COPY_PREFETCH
-       li      r7,1
-       li      r3,4
-       ble     111f
+       ble     112f
        li      r7,MAX_COPY_PREFETCH
-111:   mtctr   r7
-112:   dcbt    r3,r4
+112:   mtctr   r7
+111:   dcbt    r3,r4
        addi    r3,r3,CACHELINE_BYTES
-       bdnz    112b
-#else /* MAX_COPY_PREFETCH == 1 */
-       li      r3,CACHELINE_BYTES + 4
-       dcbt    r11,r4
-#endif /* MAX_COPY_PREFETCH */
-#endif /* CONFIG_8xx */
-
-       mtctr   r0
-53:
-#if !defined(CONFIG_8xx)
+       bdnz    111b
+#else
        dcbt    r3,r4
+       addi    r3,r3,CACHELINE_BYTES
+#endif /* MAX_COPY_PREFETCH > 1 */
+
+114:   subf    r8,r7,r0
+       mr      r0,r7
+       mtctr   r8
+
+53:    dcbt    r3,r4
 54:    dcbz    r11,r6
-#endif
-/* had to move these to keep extable in order */
        .section __ex_table,"a"
        .align  2
-       .long   70b,100f
-       .long   71b,101f
-       .long   72b,102f
-       .long   73b,103f
-#if !defined(CONFIG_8xx)
        .long   54b,105f
-#endif
        .text
 /* the main body of the cacheline loop */
        COPY_16_BYTES_WITHEX(0)
@@ -495,6 +504,11 @@ _GLOBAL(__copy_tofrom_user)
 #endif
 #endif
        bdnz    53b
+       cmpwi   r0,0
+       li      r3,4
+       li      r7,0
+       bne     114b
+#endif /* CONFIG_8xx */
 
 63:    srwi.   r0,r5,2
        mtctr   r0