Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 116 insertions, 0 deletions

diff --git a/arch/um/sys-ppc/misc.S b/arch/um/sys-ppc/misc.S
new file mode 100644
index 000000000000..11b7bd768cfd
--- /dev/null
+++ b/arch/um/sys-ppc/misc.S
@@ -0,0 +1,116 @@
+/*
+ * This file contains miscellaneous low-level functions.
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras.
+ *
+ * A couple of functions stolen from arch/ppc/kernel/misc.S for UML
+ * by Chris Emerson.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <asm/processor.h>
+#include "ppc_asm.h"
+
+#if defined(CONFIG_4xx) || defined(CONFIG_8xx)
+#define CACHE_LINE_SIZE         16
+#define LG_CACHE_LINE_SIZE      4
+#define MAX_COPY_PREFETCH       1
+#elif !defined(CONFIG_PPC64BRIDGE)
+#define CACHE_LINE_SIZE         32
+#define LG_CACHE_LINE_SIZE      5
+#define MAX_COPY_PREFETCH       4
+#else
+#define CACHE_LINE_SIZE         128
+#define LG_CACHE_LINE_SIZE      7
+#define MAX_COPY_PREFETCH       1
+#endif /* CONFIG_4xx || CONFIG_8xx */
+
+        .text
+
+/*
+ * Clear a page using the dcbz instruction, which doesn't cause any
+ * memory traffic (except to write out any cache lines which get
+ * displaced).  This only works on cacheable memory.
+ */
+_GLOBAL(clear_page)
+        li      r0,4096/CACHE_LINE_SIZE
+        mtctr   r0
+#ifdef CONFIG_8xx
+        li      r4, 0
+1:      stw     r4, 0(r3)
+        stw     r4, 4(r3)
+        stw     r4, 8(r3)
+        stw     r4, 12(r3)
+#else
+1:      dcbz    0,r3
+#endif
+        addi    r3,r3,CACHE_LINE_SIZE
+        bdnz    1b
+        blr
+
+/*
+ * Copy a whole page.  We use the dcbz instruction on the destination
+ * to reduce memory traffic (it eliminates the unnecessary reads of
+ * the destination into cache).  This requires that the destination
+ * is cacheable.
+ */
+#define COPY_16_BYTES           \
+        lwz     r6,4(r4);       \
+        lwz     r7,8(r4);       \
+        lwz     r8,12(r4);      \
+        lwzu    r9,16(r4);      \
+        stw     r6,4(r3);       \
+        stw     r7,8(r3);       \
+        stw     r8,12(r3);      \
+        stwu    r9,16(r3)
+
+_GLOBAL(copy_page)
+        addi    r3,r3,-4
+        addi    r4,r4,-4
+        li      r5,4
+
+#ifndef CONFIG_8xx
+#if MAX_COPY_PREFETCH > 1
+        li      r0,MAX_COPY_PREFETCH
+        li      r11,4
+        mtctr   r0
+11:     dcbt    r11,r4
+        addi    r11,r11,CACHE_LINE_SIZE
+        bdnz    11b
+#else /* MAX_COPY_PREFETCH == 1 */
+        dcbt    r5,r4
+        li      r11,CACHE_LINE_SIZE+4
+#endif /* MAX_COPY_PREFETCH */
+#endif /* CONFIG_8xx */
+
+        li      r0,4096/CACHE_LINE_SIZE
+        mtctr   r0
+1:
+#ifndef CONFIG_8xx
+        dcbt    r11,r4
+        dcbz    r5,r3
+#endif
+        COPY_16_BYTES
+#if CACHE_LINE_SIZE >= 32
+        COPY_16_BYTES
+#if CACHE_LINE_SIZE >= 64
+        COPY_16_BYTES
+        COPY_16_BYTES
+#if CACHE_LINE_SIZE >= 128
+        COPY_16_BYTES
+        COPY_16_BYTES
+        COPY_16_BYTES
+        COPY_16_BYTES
+#endif
+#endif
+#endif
+        bdnz    1b
+        blr