1/*
2 * blockops.S: Common block zero optimized routines.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 */
6
7#include <linux/linkage.h>
8#include <asm/page.h>
9
10	/* Zero out 64 bytes of memory at (buf + offset).
11	 * Assumes %g1 contains zero.
12	 */
13#define BLAST_BLOCK(buf, offset) \
14	std	%g0, [buf + offset + 0x38]; \
15	std	%g0, [buf + offset + 0x30]; \
16	std	%g0, [buf + offset + 0x28]; \
17	std	%g0, [buf + offset + 0x20]; \
18	std	%g0, [buf + offset + 0x18]; \
19	std	%g0, [buf + offset + 0x10]; \
20	std	%g0, [buf + offset + 0x08]; \
21	std	%g0, [buf + offset + 0x00];
22
23	/* Copy 32 bytes of memory at (src + offset) to
24	 * (dst + offset).
25	 */
26#define MIRROR_BLOCK(dst, src, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
27	ldd	[src + offset + 0x18], t0; \
28	ldd	[src + offset + 0x10], t2; \
29	ldd	[src + offset + 0x08], t4; \
30	ldd	[src + offset + 0x00], t6; \
31	std	t0, [dst + offset + 0x18]; \
32	std	t2, [dst + offset + 0x10]; \
33	std	t4, [dst + offset + 0x08]; \
34	std	t6, [dst + offset + 0x00];
35
36	/* Profiling evidence indicates that memset() is
37	 * commonly called for blocks of size PAGE_SIZE,
38	 * and (2 * PAGE_SIZE) (for kernel stacks)
39	 * and with a second arg of zero.  We assume in
40	 * all of these cases that the buffer is aligned
41	 * on at least an 8 byte boundary.
42	 *
43	 * Therefore we special case them to make them
44	 * as fast as possible.
45	 */
46
47	.text
48ENTRY(bzero_1page)
49/* NOTE: If you change the number of insns of this routine, please check
50 * arch/sparc/mm/hypersparc.S */
51	/* %o0 = buf */
52	or	%g0, %g0, %g1
53	or	%o0, %g0, %o1
54	or	%g0, (PAGE_SIZE >> 8), %g2
551:
56	BLAST_BLOCK(%o0, 0x00)
57	BLAST_BLOCK(%o0, 0x40)
58	BLAST_BLOCK(%o0, 0x80)
59	BLAST_BLOCK(%o0, 0xc0)
60	subcc	%g2, 1, %g2
61	bne	1b
62	 add	%o0, 0x100, %o0
63
64	retl
65	 nop
66ENDPROC(bzero_1page)
67
68ENTRY(__copy_1page)
69/* NOTE: If you change the number of insns of this routine, please check
70 * arch/sparc/mm/hypersparc.S */
71	/* %o0 = dst, %o1 = src */
72	or	%g0, (PAGE_SIZE >> 8), %g1
731:
74	MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
75	MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
76	MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
77	MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
78	MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
79	MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
80	MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
81	MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
82	subcc	%g1, 1, %g1
83	add	%o0, 0x100, %o0
84	bne	1b
85	 add	%o1, 0x100, %o1
86
87	retl
88	 nop
89ENDPROC(__copy_1page)
90