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1da177e4 LT |
1 | /* |
2 | * vDSO provided cache flush routines | |
3 | * | |
4 | * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), | |
5 | * IBM Corp. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | #include <linux/config.h> | |
13 | #include <asm/processor.h> | |
14 | #include <asm/ppc_asm.h> | |
15 | #include <asm/vdso.h> | |
0013a854 | 16 | #include <asm/asm-offsets.h> |
1da177e4 LT |
17 | |
18 | .text | |
19 | ||
20 | /* | |
21 | * Default "generic" version of __kernel_sync_dicache. | |
22 | * | |
23 | * void __kernel_sync_dicache(unsigned long start, unsigned long end) | |
24 | * | |
25 | * Flushes the data cache & invalidate the instruction cache for the | |
26 | * provided range [start, end[ | |
27 | * | |
28 | * Note: all CPUs supported by this kernel have a 128 bytes cache | |
29 | * line size so we don't have to peek that info from the datapage | |
30 | */ | |
31 | V_FUNCTION_BEGIN(__kernel_sync_dicache) | |
32 | .cfi_startproc | |
33 | li r5,127 | |
34 | andc r6,r3,r5 /* round low to line bdy */ | |
35 | subf r8,r6,r4 /* compute length */ | |
36 | add r8,r8,r5 /* ensure we get enough */ | |
37 | srwi. r8,r8,7 /* compute line count */ | |
38 | beqlr /* nothing to do? */ | |
39 | mtctr r8 | |
40 | mr r3,r6 | |
41 | 1: dcbst 0,r3 | |
42 | addi r3,r3,128 | |
43 | bdnz 1b | |
44 | sync | |
45 | mtctr r8 | |
46 | 1: icbi 0,r6 | |
47 | addi r6,r6,128 | |
48 | bdnz 1b | |
49 | isync | |
bdceb6a0 | 50 | li r3,0 |
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51 | blr |
52 | .cfi_endproc | |
53 | V_FUNCTION_END(__kernel_sync_dicache) | |
54 | ||
55 | ||
56 | /* | |
57 | * POWER5 version of __kernel_sync_dicache | |
58 | */ | |
59 | V_FUNCTION_BEGIN(__kernel_sync_dicache_p5) | |
60 | .cfi_startproc | |
61 | sync | |
62 | isync | |
bdceb6a0 | 63 | li r3,0 |
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64 | blr |
65 | .cfi_endproc | |
66 | V_FUNCTION_END(__kernel_sync_dicache_p5) |