Assuming Manfred's diagnosis is right something like this might fix it
*note*: Not tested this is just off the top of my head...
--- arch/i386/lib/mmx.c~ Sun Apr 15 16:49:54 2001
+++ arch/i386/lib/mmx.c Sat May 5 08:03:17 2001
@@ -57,7 +57,11 @@
: : "r" (from) );
- for(; i>0; i--)
+ /*
+ * While we have at least 320 bytes left to copy
+ */
+
+ for(; i>5; i--)
{
__asm__ __volatile__ (
"1: prefetch 320(%0)\n"
@@ -89,6 +93,31 @@
from+=64;
to+=64;
}
+
+ /*
+ * While we have at least 64 bytes left to copy
+ */
+
+ for(; i>0; i--)
+ {
+ __asm__ __volatile__ (
+ " movq (%0), %%mm0\n"
+ " movq 8(%0), %%mm1\n"
+ " movq 16(%0), %%mm2\n"
+ " movq 24(%0), %%mm3\n"
+ " movq %%mm0, (%1)\n"
+ " movq %%mm1, 8(%1)\n"
+ " movq %%mm2, 16(%1)\n"
+ " movq %%mm3, 24(%1)\n"
+ " movq 32(%0), %%mm0\n"
+ " movq 40(%0), %%mm1\n"
+ " movq 48(%0), %%mm2\n"
+ " movq 56(%0), %%mm3\n"
+ " movq %%mm0, 32(%1)\n"
+ " movq %%mm1, 40(%1)\n"
+ " movq %%mm2, 48(%1)\n"
+ " movq %%mm3, 56(%1)\n"
+ : : "r" (from), "r" (to) : "memory");
/*
* Now do the tail of the block
*/
@@ -163,7 +192,11 @@
".previous"
: : "r" (from) );
- for(i=0; i<4096/64; i++)
+ /*
+ * While there is at least 320 bytes to copy
+ */
+
+ for(i=0; i<59; i++)
{
__asm__ __volatile__ (
"1: prefetch 320(%0)\n"
@@ -195,6 +228,35 @@
from+=64;
to+=64;
}
+
+ /*
+ * Finish off the page
+ */
+
+ for(; i<64; i++)
+ {
+ __asm__ __volatile__ (
+ " movq (%0), %%mm0\n"
+ " movntq %%mm0, (%1)\n"
+ " movq 8(%0), %%mm1\n"
+ " movntq %%mm1, 8(%1)\n"
+ " movq 16(%0), %%mm2\n"
+ " movntq %%mm2, 16(%1)\n"
+ " movq 24(%0), %%mm3\n"
+ " movntq %%mm3, 24(%1)\n"
+ " movq 32(%0), %%mm4\n"
+ " movntq %%mm4, 32(%1)\n"
+ " movq 40(%0), %%mm5\n"
+ " movntq %%mm5, 40(%1)\n"
+ " movq 48(%0), %%mm6\n"
+ " movntq %%mm6, 48(%1)\n"
+ " movq 56(%0), %%mm7\n"
+ " movntq %%mm7, 56(%1)\n"
+ : : "r" (from), "r" (to) : "memory");
+ from+=64;
+ to+=64;
+ }
+
/* since movntq is weakly-ordered, a "sfence" is needed to become
* ordered again.
*/
@@ -270,7 +332,11 @@
".previous"
: : "r" (from) );
- for(i=0; i<4096/64; i++)
+ /*
+ * Copy the page until we have 320 bytes to go
+ */
+
+ for(i=0; i<59; i++)
{
__asm__ __volatile__ (
"1: prefetch 320(%0)\n"
@@ -298,6 +364,34 @@
" .align 4\n"
" .long 1b, 3b\n"
".previous"
+ : : "r" (from), "r" (to) : "memory");
+ from+=64;
+ to+=64;
+ }
+
+ /*
+ * Copy the tail of the page
+ */
+
+ for(; i<64; i++)
+ {
+ __asm__ __volatile__ (
+ " movq (%0), %%mm0\n"
+ " movq 8(%0), %%mm1\n"
+ " movq 16(%0), %%mm2\n"
+ " movq 24(%0), %%mm3\n"
+ " movq %%mm0, (%1)\n"
+ " movq %%mm1, 8(%1)\n"
+ " movq %%mm2, 16(%1)\n"
+ " movq %%mm3, 24(%1)\n"
+ " movq 32(%0), %%mm0\n"
+ " movq 40(%0), %%mm1\n"
+ " movq 48(%0), %%mm2\n"
+ " movq 56(%0), %%mm3\n"
+ " movq %%mm0, 32(%1)\n"
+ " movq %%mm1, 40(%1)\n"
+ " movq %%mm2, 48(%1)\n"
+ " movq %%mm3, 56(%1)\n"
: : "r" (from), "r" (to) : "memory");
from+=64;
to+=64;
-
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