| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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> |
| 16 | #include <asm/offsets.h> |
| 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 |
| 50 | blr |
| 51 | .cfi_endproc |
| 52 | V_FUNCTION_END(__kernel_sync_dicache) |
| 53 | |
| 54 | |
| 55 | /* |
| 56 | * POWER5 version of __kernel_sync_dicache |
| 57 | */ |
| 58 | V_FUNCTION_BEGIN(__kernel_sync_dicache_p5) |
| 59 | .cfi_startproc |
| 60 | sync |
| 61 | isync |
| 62 | blr |
| 63 | .cfi_endproc |
| 64 | V_FUNCTION_END(__kernel_sync_dicache_p5) |