v2.4.8 -> v2.4.8.1
[opensuse:kernel.git] / arch / arm / lib / io-writesw-armv4.S
1 /*
2  *  linux/arch/arm/lib/io-writesw-armv4.S
3  *
4  *  Copyright (C) 1995-2000 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/linkage.h>
11 #include <asm/assembler.h>
12 #include <asm/hardware.h>
13
14 .outsw_bad_alignment:
15                 adr     r0, .outsw_bad_align_msg
16                 mov     r2, lr
17                 b       SYMBOL_NAME(panic)
18 .outsw_bad_align_msg:
19                 .asciz  "outsw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
20                 .align
21
22 .outsw_align:   tst     r1, #1
23                 bne     .outsw_bad_alignment
24
25                 ldrh    r3, [r1], #2
26                 strh    r3, [r0]
27
28                 subs    r2, r2, #1
29                 RETINSTR(moveq, pc, lr)
30
31 ENTRY(__raw_writesw)
32                 teq     r2, #0          @ do we have to check for the zero len?
33                 moveq   pc, lr
34                 tst     r1, #3
35                 bne     .outsw_align
36
37                 stmfd   sp!, {r4, r5, lr}
38
39                 subs    r2, r2, #8
40                 bmi     .no_outsw_8
41
42 .outsw_8_lp:    ldmia   r1!, {r3, r4, r5, ip}
43
44                 strh    r3, [r0]
45                 mov     r3, r3, lsr #16
46                 strh    r3, [r0]
47                 strh    r4, [r0]
48                 mov     r4, r4, lsr #16
49                 strh    r4, [r0]
50                 strh    r5, [r0]
51                 mov     r5, r5, lsr #16
52                 strh    r5, [r0]
53                 strh    ip, [r0]
54                 mov     ip, ip, lsr #16
55                 strh    ip, [r0]
56
57                 subs    r2, r2, #8
58                 bpl     .outsw_8_lp
59
60                 tst     r2, #7
61                 LOADREGS(eqfd, sp!, {r4, r5, pc})
62
63 .no_outsw_8:    tst     r2, #4
64                 beq     .no_outsw_4
65
66                 ldmia   r1!, {r3, ip}
67                 strh    r3, [r0]
68                 mov     r3, r3, lsr #16
69                 strh    r3, [r0]
70                 strh    ip, [r0]
71                 mov     ip, ip, lsr #16
72                 strh    ip, [r0]
73
74 .no_outsw_4:    tst     r2, #2
75                 beq     .no_outsw_2
76
77                 ldr     r3, [r1], #4
78                 strh    r3, [r0]
79                 mov     r3, r3, lsr #16
80                 strh    r3, [r0]
81
82 .no_outsw_2:    tst     r2, #1
83                 ldrneh  r3, [r1]
84                 strneh  r3, [r0]
85
86                 LOADREGS(fd, sp!, {r4, r5, pc})