> > 3) Useful when PPC must do page copies in place of 'page flipping'.
>
> So you're saying we should worry about it later?
For the future, copy_page using dcbz:
diff -r 7669fca80bfc xen/arch/powerpc/mm.c
--- a/xen/arch/powerpc/mm.c Mon Dec 04 11:46:53 2006 -0500
+++ b/xen/arch/powerpc/mm.c Fri Dec 15 17:52:58 2006 -0500
@@ -280,7 +280,8 @@ extern void copy_page(void *dp, void *sp
if (on_systemsim()) {
systemsim_memcpy(dp, sp, PAGE_SIZE);
} else {
- memcpy(dp, sp, PAGE_SIZE);
+ clear_page(dp);
+ __copy_page(dp, sp);
}
}
diff -r 7669fca80bfc xen/include/asm-powerpc/page.h
--- a/xen/include/asm-powerpc/page.h Mon Dec 04 11:46:53 2006 -0500
+++ b/xen/include/asm-powerpc/page.h Fri Dec 15 17:52:58 2006 -0500
@@ -90,6 +90,25 @@ 1: dcbz 0,%0\n\
extern void copy_page(void *dp, void *sp);
+static __inline__ void __copy_page(void *dp, void *sp)
+{
+ ulong dwords, dword_size;
+
+ dword_size = 8;
+ dwords = (PAGE_SIZE / dword_size) - 1;
+
+ __asm__ __volatile__(
+ "mtctr %2 # copy_page\n\
+ ld %2,0(%1)\n\
+ std %2,0(%0)\n\
+1: ldu %2,8(%1)\n\
+ stdu %2,8(%0)\n\
+ bdnz 1b"
+ : /* no result */
+ : "r" (dp), "r" (sp), "r" (dwords)
+ : "%ctr", "memory");
+}
+
#define linear_pg_table linear_l1_table
static inline int get_order(unsigned long size)
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