1 // SPDX-License-Identifier: GPL-2.0 2 /***************************************************************************/ 3 4 /* 5 * cache.c -- general ColdFire Cache maintenance code 6 * 7 * Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com) 8 */ 9 10 /***************************************************************************/ 11 12 #include <linux/kernel.h> 13 #include <asm/coldfire.h> 14 #include <asm/mcfsim.h> 15 16 /***************************************************************************/ 17 #ifdef CACHE_PUSH 18 /***************************************************************************/ 19 20 /* 21 * Use cpushl to push all dirty cache lines back to memory. 22 * Older versions of GAS don't seem to know how to generate the 23 * ColdFire cpushl instruction... Oh well, bit stuff it for now. 24 */ 25 26 void mcf_cache_push(void) 27 { 28 __asm__ __volatile__ ( 29 "clrl %%d0\n\t" 30 "1:\n\t" 31 "movel %%d0,%%a0\n\t" 32 "2:\n\t" 33 ".word 0xf468\n\t" 34 "addl %0,%%a0\n\t" 35 "cmpl %1,%%a0\n\t" 36 "blt 2b\n\t" 37 "addql #1,%%d0\n\t" 38 "cmpil %2,%%d0\n\t" 39 "bne 1b\n\t" 40 : /* No output */ 41 : "i" (CACHE_LINE_SIZE), 42 "i" (DCACHE_SIZE / CACHE_WAYS), 43 "i" (CACHE_WAYS) 44 : "d0", "a0" ); 45 } 46 47 /***************************************************************************/ 48 #endif /* CACHE_PUSH */ 49 /***************************************************************************/ 50