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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sh/] [mm/] [clear_page.S] - Blame information for rev 7

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/*
 * __clear_user_page, __clear_user, clear_page implementation of SuperH
 *
 * Copyright (C) 2001  Kaz Kojima
 * Copyright (C) 2001, 2002  Niibe Yutaka
 * Copyright (C) 2006  Paul Mundt
 */
#include 
#include 
 
/*
 * clear_page_slow
 * @to: P1 address
 *
 * void clear_page_slow(void *to)
 */
 
/*
 * r0 --- scratch
 * r4 --- to
 * r5 --- to + PAGE_SIZE
 */
ENTRY(clear_page_slow)
        mov     r4,r5
        mov.l   .Llimit,r0
        add     r0,r5
        mov     #0,r0
        !
1:
#if defined(CONFIG_CPU_SH3)
        mov.l   r0,@r4
#elif defined(CONFIG_CPU_SH4)
        movca.l r0,@r4
        mov     r4,r1
#endif
        add     #32,r4
        mov.l   r0,@-r4
        mov.l   r0,@-r4
        mov.l   r0,@-r4
        mov.l   r0,@-r4
        mov.l   r0,@-r4
        mov.l   r0,@-r4
        mov.l   r0,@-r4
#if defined(CONFIG_CPU_SH4)
        ocbwb   @r1
#endif
        cmp/eq  r5,r4
        bf/s    1b
         add    #28,r4
        !
        rts
         nop
.Llimit:        .long   (PAGE_SIZE-28)
 
ENTRY(__clear_user)
        !
        mov     #0, r0
        mov     #0xe0, r1       ! 0xffffffe0
        !
        ! r4..(r4+31)&~32          -------- not aligned [ Area 0 ]
        ! (r4+31)&~32..(r4+r5)&~32 -------- aligned     [ Area 1 ]
        ! (r4+r5)&~32..r4+r5       -------- not aligned [ Area 2 ]
        !
        ! Clear area 0
        mov     r4, r2
        !
        tst     r1, r5          ! length < 32
        bt      .Larea2         ! skip to remainder
        !
        add     #31, r2
        and     r1, r2
        cmp/eq  r4, r2
        bt      .Larea1
        mov     r2, r3
        sub     r4, r3
        mov     r3, r7
        mov     r4, r2
        !
.L0:    dt      r3
0:      mov.b   r0, @r2
        bf/s    .L0
         add    #1, r2
        !
        sub     r7, r5
        mov     r2, r4
.Larea1:
        mov     r4, r3
        add     r5, r3
        and     r1, r3
        cmp/hi  r2, r3
        bf      .Larea2
        !
        ! Clear area 1
#if defined(CONFIG_CPU_SH4)
1:      movca.l r0, @r2
#else
1:      mov.l   r0, @r2
#endif
        add     #4, r2
2:      mov.l   r0, @r2
        add     #4, r2
3:      mov.l   r0, @r2
        add     #4, r2
4:      mov.l   r0, @r2
        add     #4, r2
5:      mov.l   r0, @r2
        add     #4, r2
6:      mov.l   r0, @r2
        add     #4, r2
7:      mov.l   r0, @r2
        add     #4, r2
8:      mov.l   r0, @r2
        add     #4, r2
        cmp/hi  r2, r3
        bt/s    1b
         nop
        !
        ! Clear area 2
.Larea2:
        mov     r4, r3
        add     r5, r3
        cmp/hs  r3, r2
        bt/s    .Ldone
         sub    r2, r3
.L2:    dt      r3
9:      mov.b   r0, @r2
        bf/s    .L2
         add    #1, r2
        !
.Ldone: rts
         mov    #0, r0  ! return 0 as normal return
 
        ! return the number of bytes remained
.Lbad_clear_user:
        mov     r4, r0
        add     r5, r0
        rts
         sub    r2, r0
 
.section __ex_table,"a"
        .align 2
        .long   0b, .Lbad_clear_user
        .long   1b, .Lbad_clear_user
        .long   2b, .Lbad_clear_user
        .long   3b, .Lbad_clear_user
        .long   4b, .Lbad_clear_user
        .long   5b, .Lbad_clear_user
        .long   6b, .Lbad_clear_user
        .long   7b, .Lbad_clear_user
        .long   8b, .Lbad_clear_user
        .long   9b, .Lbad_clear_user
.previous

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
2			`* __clear_user_page, __clear_user, clear_page implementation of SuperH`
3			`*`
4			`* Copyright (C) 2001 Kaz Kojima`
5			`* Copyright (C) 2001, 2002 Niibe Yutaka`
6			`* Copyright (C) 2006 Paul Mundt`
7			`*/`
8			`#include`
9			`#include`
10
11			`/*`
12			`* clear_page_slow`
13			`* @to: P1 address`
14			`*`
15			`* void clear_page_slow(void *to)`
16			`*/`
17
18			`/*`
19			`* r0 --- scratch`
20			`* r4 --- to`
21			`* r5 --- to + PAGE_SIZE`
22			`*/`
23			`ENTRY(clear_page_slow)`
24			`mov r4,r5`
25			`mov.l .Llimit,r0`
26			`add r0,r5`
27			`mov #0,r0`
28			`!`
29			`1:`
30			`#if defined(CONFIG_CPU_SH3)`
31			`mov.l r0,@r4`
32			`#elif defined(CONFIG_CPU_SH4)`
33			`movca.l r0,@r4`
34			`mov r4,r1`
35			`#endif`
36			`add #32,r4`
37			`mov.l r0,@-r4`
38			`mov.l r0,@-r4`
39			`mov.l r0,@-r4`
40			`mov.l r0,@-r4`
41			`mov.l r0,@-r4`
42			`mov.l r0,@-r4`
43			`mov.l r0,@-r4`
44			`#if defined(CONFIG_CPU_SH4)`
45			`ocbwb @r1`
46			`#endif`
47			`cmp/eq r5,r4`
48			`bf/s 1b`
49			`add #28,r4`
50			`!`
51			`rts`
52			`nop`
53			`.Llimit: .long (PAGE_SIZE-28)`
54
55			`ENTRY(__clear_user)`
56			`!`
57			`mov #0, r0`
58			`mov #0xe0, r1 ! 0xffffffe0`
59			`!`
60			`! r4..(r4+31)&~32 -------- not aligned [ Area 0 ]`
61			`! (r4+31)&~32..(r4+r5)&~32 -------- aligned [ Area 1 ]`
62			`! (r4+r5)&~32..r4+r5 -------- not aligned [ Area 2 ]`
63			`!`
64			`! Clear area 0`
65			`mov r4, r2`
66			`!`
67			`tst r1, r5 ! length < 32`
68			`bt .Larea2 ! skip to remainder`
69			`!`
70			`add #31, r2`
71			`and r1, r2`
72			`cmp/eq r4, r2`
73			`bt .Larea1`
74			`mov r2, r3`
75			`sub r4, r3`
76			`mov r3, r7`
77			`mov r4, r2`
78			`!`
79			`.L0: dt r3`
80			`0: mov.b r0, @r2`
81			`bf/s .L0`
82			`add #1, r2`
83			`!`
84			`sub r7, r5`
85			`mov r2, r4`
86			`.Larea1:`
87			`mov r4, r3`
88			`add r5, r3`
89			`and r1, r3`
90			`cmp/hi r2, r3`
91			`bf .Larea2`
92			`!`
93			`! Clear area 1`
94			`#if defined(CONFIG_CPU_SH4)`
95			`1: movca.l r0, @r2`
96			`#else`
97			`1: mov.l r0, @r2`
98			`#endif`
99			`add #4, r2`
100			`2: mov.l r0, @r2`
101			`add #4, r2`
102			`3: mov.l r0, @r2`
103			`add #4, r2`
104			`4: mov.l r0, @r2`
105			`add #4, r2`
106			`5: mov.l r0, @r2`
107			`add #4, r2`
108			`6: mov.l r0, @r2`
109			`add #4, r2`
110			`7: mov.l r0, @r2`
111			`add #4, r2`
112			`8: mov.l r0, @r2`
113			`add #4, r2`
114			`cmp/hi r2, r3`
115			`bt/s 1b`
116			`nop`
117			`!`
118			`! Clear area 2`
119			`.Larea2:`
120			`mov r4, r3`
121			`add r5, r3`
122			`cmp/hs r3, r2`
123			`bt/s .Ldone`
124			`sub r2, r3`
125			`.L2: dt r3`
126			`9: mov.b r0, @r2`
127			`bf/s .L2`
128			`add #1, r2`
129			`!`
130			`.Ldone: rts`
131			`mov #0, r0 ! return 0 as normal return`
132
133			`! return the number of bytes remained`
134			`.Lbad_clear_user:`
135			`mov r4, r0`
136			`add r5, r0`
137			`rts`
138			`sub r2, r0`
139
140			`.section __ex_table,"a"`
141			`.align 2`
142			`.long 0b, .Lbad_clear_user`
143			`.long 1b, .Lbad_clear_user`
144			`.long 2b, .Lbad_clear_user`
145			`.long 3b, .Lbad_clear_user`
146			`.long 4b, .Lbad_clear_user`
147			`.long 5b, .Lbad_clear_user`
148			`.long 6b, .Lbad_clear_user`
149			`.long 7b, .Lbad_clear_user`
150			`.long 8b, .Lbad_clear_user`
151			`.long 9b, .Lbad_clear_user`
152			`.previous`

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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sh/] [mm/] [clear_page.S] - Blame information for rev 7