1 /* 2 * Cache management functions for Hexagon 3 * 4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 and 8 * only version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA. 19 */ 20 21 #include <linux/mm.h> 22 #include <asm/cacheflush.h> 23 #include <asm/hexagon_vm.h> 24 25 #define spanlines(start, end) \ 26 (((end - (start & ~(LINESIZE - 1))) >> LINEBITS) + 1) 27 28 void flush_dcache_range(unsigned long start, unsigned long end) 29 { 30 unsigned long lines = spanlines(start, end-1); 31 unsigned long i, flags; 32 33 start &= ~(LINESIZE - 1); 34 35 local_irq_save(flags); 36 37 for (i = 0; i < lines; i++) { 38 __asm__ __volatile__ ( 39 " dccleaninva(%0); " 40 : 41 : "r" (start) 42 ); 43 start += LINESIZE; 44 } 45 local_irq_restore(flags); 46 } 47 48 void flush_icache_range(unsigned long start, unsigned long end) 49 { 50 unsigned long lines = spanlines(start, end-1); 51 unsigned long i, flags; 52 53 start &= ~(LINESIZE - 1); 54 55 local_irq_save(flags); 56 57 for (i = 0; i < lines; i++) { 58 __asm__ __volatile__ ( 59 " dccleana(%0); " 60 " icinva(%0); " 61 : 62 : "r" (start) 63 ); 64 start += LINESIZE; 65 } 66 __asm__ __volatile__ ( 67 "isync" 68 ); 69 local_irq_restore(flags); 70 } 71 EXPORT_SYMBOL(flush_icache_range); 72 73 void hexagon_clean_dcache_range(unsigned long start, unsigned long end) 74 { 75 unsigned long lines = spanlines(start, end-1); 76 unsigned long i, flags; 77 78 start &= ~(LINESIZE - 1); 79 80 local_irq_save(flags); 81 82 for (i = 0; i < lines; i++) { 83 __asm__ __volatile__ ( 84 " dccleana(%0); " 85 : 86 : "r" (start) 87 ); 88 start += LINESIZE; 89 } 90 local_irq_restore(flags); 91 } 92 93 void hexagon_inv_dcache_range(unsigned long start, unsigned long end) 94 { 95 unsigned long lines = spanlines(start, end-1); 96 unsigned long i, flags; 97 98 start &= ~(LINESIZE - 1); 99 100 local_irq_save(flags); 101 102 for (i = 0; i < lines; i++) { 103 __asm__ __volatile__ ( 104 " dcinva(%0); " 105 : 106 : "r" (start) 107 ); 108 start += LINESIZE; 109 } 110 local_irq_restore(flags); 111 } 112 113 114 115 116 /* 117 * This is just really brutal and shouldn't be used anyways, 118 * especially on V2. Left here just in case. 119 */ 120 void flush_cache_all_hexagon(void) 121 { 122 unsigned long flags; 123 local_irq_save(flags); 124 __vmcache_ickill(); 125 __vmcache_dckill(); 126 __vmcache_l2kill(); 127 local_irq_restore(flags); 128 mb(); 129 } 130 131 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 132 unsigned long vaddr, void *dst, void *src, int len) 133 { 134 memcpy(dst, src, len); 135 if (vma->vm_flags & VM_EXEC) { 136 flush_icache_range((unsigned long) dst, 137 (unsigned long) dst + len); 138 } 139 } 140