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, 80 insertions, 0 deletions

diff --git a/arch/arm/lib/memzero.S b/arch/arm/lib/memzero.S
new file mode 100644
index 000000000000..51ccc60160fd
--- /dev/null
+++ b/arch/arm/lib/memzero.S
@@ -0,0 +1,80 @@
+/*
+ *  linux/arch/arm/lib/memzero.S
+ *
+ *  Copyright (C) 1995-2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+        .text
+        .align  5
+        .word   0
+/*
+ * Align the pointer in r0.  r3 contains the number of bytes that we are
+ * mis-aligned by, and r1 is the number of bytes.  If r1 < 4, then we
+ * don't bother; we use byte stores instead.
+ */
+1:      subs    r1, r1, #4              @ 1 do we have enough
+        blt     5f                      @ 1 bytes to align with?
+        cmp     r3, #2                  @ 1
+        strltb  r2, [r0], #1            @ 1
+        strleb  r2, [r0], #1            @ 1
+        strb    r2, [r0], #1            @ 1
+        add     r1, r1, r3              @ 1 (r1 = r1 - (4 - r3))
+/*
+ * The pointer is now aligned and the length is adjusted.  Try doing the
+ * memzero again.
+ */
+
+ENTRY(__memzero)
+        mov     r2, #0                  @ 1
+        ands    r3, r0, #3              @ 1 unaligned?
+        bne     1b                      @ 1
+/*
+ * r3 = 0, and we know that the pointer in r0 is aligned to a word boundary.
+ */
+        cmp     r1, #16                 @ 1 we can skip this chunk if we
+        blt     4f                      @ 1 have < 16 bytes
+/*
+ * We need an extra register for this loop - save the return address and
+ * use the LR
+ */
+        str     lr, [sp, #-4]!          @ 1
+        mov     ip, r2                  @ 1
+        mov     lr, r2                  @ 1
+
+3:      subs    r1, r1, #64             @ 1 write 32 bytes out per loop
+        stmgeia r0!, {r2, r3, ip, lr}   @ 4
+        stmgeia r0!, {r2, r3, ip, lr}   @ 4
+        stmgeia r0!, {r2, r3, ip, lr}   @ 4
+        stmgeia r0!, {r2, r3, ip, lr}   @ 4
+        bgt     3b                      @ 1
+        LOADREGS(eqfd, sp!, {pc})       @ 1/2 quick exit
+/*
+ * No need to correct the count; we're only testing bits from now on
+ */
+        tst     r1, #32                 @ 1
+        stmneia r0!, {r2, r3, ip, lr}   @ 4
+        stmneia r0!, {r2, r3, ip, lr}   @ 4
+        tst     r1, #16                 @ 1 16 bytes or more?
+        stmneia r0!, {r2, r3, ip, lr}   @ 4
+        ldr     lr, [sp], #4            @ 1
+
+4:      tst     r1, #8                  @ 1 8 bytes or more?
+        stmneia r0!, {r2, r3}           @ 2
+        tst     r1, #4                  @ 1 4 bytes or more?
+        strne   r2, [r0], #4            @ 1
+/*
+ * When we get here, we've got less than 4 bytes to zero.  We
+ * may have an unaligned pointer as well.
+ */
+5:      tst     r1, #2                  @ 1 2 bytes or more?
+        strneb  r2, [r0], #1            @ 1
+        strneb  r2, [r0], #1            @ 1
+        tst     r1, #1                  @ 1 a byte left over
+        strneb  r2, [r0], #1            @ 1
+        RETINSTR(mov,pc,lr)             @ 1