Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sparc / lib / blockops.S

diff --git a/kernel/arch/sparc/lib/blockops.S b/kernel/arch/sparc/lib/blockops.S
new file mode 100644 (file)
index 0000000..3c77101
--- /dev/null
+++ b/kernel/arch/sparc/lib/blockops.S
@@ -0,0 +1,89 @@
+/*
+ * blockops.S: Common block zero optimized routines.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+       /* Zero out 64 bytes of memory at (buf + offset).
+        * Assumes %g1 contains zero.
+        */
+#define BLAST_BLOCK(buf, offset) \
+       std     %g0, [buf + offset + 0x38]; \
+       std     %g0, [buf + offset + 0x30]; \
+       std     %g0, [buf + offset + 0x28]; \
+       std     %g0, [buf + offset + 0x20]; \
+       std     %g0, [buf + offset + 0x18]; \
+       std     %g0, [buf + offset + 0x10]; \
+       std     %g0, [buf + offset + 0x08]; \
+       std     %g0, [buf + offset + 0x00];
+
+       /* Copy 32 bytes of memory at (src + offset) to
+        * (dst + offset).
+        */
+#define MIRROR_BLOCK(dst, src, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
+       ldd     [src + offset + 0x18], t0; \
+       ldd     [src + offset + 0x10], t2; \
+       ldd     [src + offset + 0x08], t4; \
+       ldd     [src + offset + 0x00], t6; \
+       std     t0, [dst + offset + 0x18]; \
+       std     t2, [dst + offset + 0x10]; \
+       std     t4, [dst + offset + 0x08]; \
+       std     t6, [dst + offset + 0x00];
+
+       /* Profiling evidence indicates that memset() is
+        * commonly called for blocks of size PAGE_SIZE,
+        * and (2 * PAGE_SIZE) (for kernel stacks)
+        * and with a second arg of zero.  We assume in
+        * all of these cases that the buffer is aligned
+        * on at least an 8 byte boundary.
+        *
+        * Therefore we special case them to make them
+        * as fast as possible.
+        */
+
+       .text
+ENTRY(bzero_1page)
+/* NOTE: If you change the number of insns of this routine, please check
+ * arch/sparc/mm/hypersparc.S */
+       /* %o0 = buf */
+       or      %g0, %g0, %g1
+       or      %o0, %g0, %o1
+       or      %g0, (PAGE_SIZE >> 8), %g2
+1:
+       BLAST_BLOCK(%o0, 0x00)
+       BLAST_BLOCK(%o0, 0x40)
+       BLAST_BLOCK(%o0, 0x80)
+       BLAST_BLOCK(%o0, 0xc0)
+       subcc   %g2, 1, %g2
+       bne     1b
+        add    %o0, 0x100, %o0
+
+       retl
+        nop
+ENDPROC(bzero_1page)
+
+ENTRY(__copy_1page)
+/* NOTE: If you change the number of insns of this routine, please check
+ * arch/sparc/mm/hypersparc.S */
+       /* %o0 = dst, %o1 = src */
+       or      %g0, (PAGE_SIZE >> 8), %g1
+1:
+       MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
+       subcc   %g1, 1, %g1
+       add     %o0, 0x100, %o0
+       bne     1b
+        add    %o1, 0x100, %o1
+
+       retl
+        nop
+ENDPROC(__copy_1page)