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-rw-r--r--arch/sparc/lib/blockops.S93
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/sparc/lib/blockops.S b/arch/sparc/lib/blockops.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * 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>
+#include <asm/export.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)
+EXPORT_SYMBOL(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)
+EXPORT_SYMBOL(__copy_1page)