blob: cdcf9148ea207846fd4ee34ae0473aa068574410 [file] [log] [blame]
Bryan Wu1394f032007-05-06 14:50:22 -07001/*
Robin Getz96f10502009-09-24 14:11:24 +00002 * Copyright 2004-2009 Analog Devices Inc.
Bryan Wu1394f032007-05-06 14:50:22 -07003 *
Sonic Zhangde450832012-05-17 14:45:27 +08004 * Licensed under the Clear BSD license or the GPL-2 (or later)
Bryan Wu1394f032007-05-06 14:50:22 -07005 */
6
7#include <linux/linkage.h>
8
9.align 2
10
11#ifdef CONFIG_MEMSET_L1
12.section .l1.text
13#else
14.text
15#endif
16
17/*
18 * C Library function MEMSET
19 * R0 = address (leave unchanged to form result)
20 * R1 = filler byte
21 * R2 = count
22 * Favours word aligned data.
Robin Getz648eee52010-05-04 14:59:21 +000023 * The strncpy assumes that I0 and I1 are not used in this function
Bryan Wu1394f032007-05-06 14:50:22 -070024 */
25
26ENTRY(_memset)
27 P0 = R0 ; /* P0 = address */
28 P2 = R2 ; /* P2 = count */
29 R3 = R0 + R2; /* end */
30 CC = R2 <= 7(IU);
31 IF CC JUMP .Ltoo_small;
32 R1 = R1.B (Z); /* R1 = fill char */
33 R2 = 3;
34 R2 = R0 & R2; /* addr bottom two bits */
35 CC = R2 == 0; /* AZ set if zero. */
36 IF !CC JUMP .Lforce_align ; /* Jump if addr not aligned. */
37
38.Laligned:
39 P1 = P2 >> 2; /* count = n/4 */
40 R2 = R1 << 8; /* create quad filler */
41 R2.L = R2.L + R1.L(NS);
42 R2.H = R2.L + R1.H(NS);
43 P2 = R3;
44
45 LSETUP (.Lquad_loop , .Lquad_loop) LC0=P1;
46.Lquad_loop:
47 [P0++] = R2;
48
49 CC = P0 == P2;
50 IF !CC JUMP .Lbytes_left;
51 RTS;
52
53.Lbytes_left:
54 R2 = R3; /* end point */
55 R3 = P0; /* current position */
56 R2 = R2 - R3; /* bytes left */
57 P2 = R2;
58
59.Ltoo_small:
60 CC = P2 == 0; /* Check zero count */
61 IF CC JUMP .Lfinished; /* Unusual */
62
63.Lbytes:
64 LSETUP (.Lbyte_loop , .Lbyte_loop) LC0=P2;
65.Lbyte_loop:
66 B[P0++] = R1;
67
68.Lfinished:
69 RTS;
70
71.Lforce_align:
72 CC = BITTST (R0, 0); /* odd byte */
73 R0 = 4;
74 R0 = R0 - R2;
75 P1 = R0;
76 R0 = P0; /* Recover return address */
77 IF !CC JUMP .Lskip1;
78 B[P0++] = R1;
79.Lskip1:
80 CC = R2 <= 2; /* 2 bytes */
81 P2 -= P1; /* reduce count */
82 IF !CC JUMP .Laligned;
83 B[P0++] = R1;
84 B[P0++] = R1;
85 JUMP .Laligned;
86
Mike Frysinger51be24c2007-06-11 15:31:30 +080087ENDPROC(_memset)