1 /***************************************************************************/
2
3 /*
4 * cache.c -- general ColdFire Cache maintenance code
5 *
6 * Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
7 */
8
9 /***************************************************************************/
10
11 #include <linux/kernel.h>
12 #include <asm/coldfire.h>
13 #include <asm/mcfsim.h>
14
15 /***************************************************************************/
16 #ifdef CACHE_PUSH
17 /***************************************************************************/
18
19 /*
20 * Use cpushl to push all dirty cache lines back to memory.
21 * Older versions of GAS don't seem to know how to generate the
22 * ColdFire cpushl instruction... Oh well, bit stuff it for now.
23 */
24
mcf_cache_push(void)25 void mcf_cache_push(void)
26 {
27 __asm__ __volatile__ (
28 "clrl %%d0\n\t"
29 "1:\n\t"
30 "movel %%d0,%%a0\n\t"
31 "2:\n\t"
32 ".word 0xf468\n\t"
33 "addl %0,%%a0\n\t"
34 "cmpl %1,%%a0\n\t"
35 "blt 2b\n\t"
36 "addql #1,%%d0\n\t"
37 "cmpil %2,%%d0\n\t"
38 "bne 1b\n\t"
39 : /* No output */
40 : "i" (CACHE_LINE_SIZE),
41 "i" (DCACHE_SIZE / CACHE_WAYS),
42 "i" (CACHE_WAYS)
43 : "d0", "a0" );
44 }
45
46 /***************************************************************************/
47 #endif /* CACHE_PUSH */
48 /***************************************************************************/
49