1 /*- 2 * Copyright (c) 2014 The FreeBSD Foundation 3 * 4 * This software was developed by Semihalf under 5 * the sponsorship of the FreeBSD Foundation. 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 33 #include <machine/armreg.h> 34 #include <machine/atomic.h> 35 36 #include <stand.h> 37 38 #include "bootstrap.h" 39 #include "cache.h" 40 41 static long cache_flags; 42 #define CACHE_FLAG_DIC_OFF (1<<0) 43 #define CACHE_FLAG_IDC_OFF (1<<1) 44 45 static bool 46 get_cache_dic(uint64_t ctr) 47 { 48 if ((cache_flags & CACHE_FLAG_DIC_OFF) != 0) { 49 return (false); 50 } 51 52 return (CTR_DIC_VAL(ctr) != 0); 53 } 54 55 static bool 56 get_cache_idc(uint64_t ctr) 57 { 58 if ((cache_flags & CACHE_FLAG_IDC_OFF) != 0) { 59 return (false); 60 } 61 62 return (CTR_IDC_VAL(ctr) != 0); 63 } 64 65 static unsigned int 66 get_dcache_line_size(uint64_t ctr) 67 { 68 unsigned int dcl_size; 69 70 /* 71 * Relevant field [19:16] is LOG2 72 * of the number of words in DCache line 73 */ 74 dcl_size = CTR_DLINE_SIZE(ctr); 75 76 /* Size of word shifted by cache line size */ 77 return (sizeof(int) << dcl_size); 78 } 79 80 void 81 cpu_flush_dcache(const void *ptr, size_t len) 82 { 83 uint64_t cl_size, ctr; 84 vm_offset_t addr, end; 85 86 /* Accessible from all security levels */ 87 ctr = READ_SPECIALREG(ctr_el0); 88 89 if (get_cache_idc(ctr)) { 90 dsb(ishst); 91 } else { 92 cl_size = get_dcache_line_size(ctr); 93 94 /* Calculate end address to clean */ 95 end = (vm_offset_t)ptr + (vm_offset_t)len; 96 /* Align start address to cache line */ 97 addr = (vm_offset_t)ptr; 98 addr = rounddown2(addr, cl_size); 99 100 for (; addr < end; addr += cl_size) 101 __asm __volatile("dc civac, %0" : : "r" (addr) : 102 "memory"); 103 /* Full system DSB */ 104 dsb(ish); 105 } 106 } 107 108 void 109 cpu_inval_icache(void) 110 { 111 uint64_t ctr; 112 113 /* Accessible from all security levels */ 114 ctr = READ_SPECIALREG(ctr_el0); 115 116 if (get_cache_dic(ctr)) { 117 isb(); 118 } else { 119 __asm __volatile( 120 "ic ialluis \n" 121 "dsb ish \n" 122 "isb \n" 123 : : : "memory"); 124 } 125 } 126 127 static int 128 command_cache_flags(int argc, char *argv[]) 129 { 130 char *cp; 131 long new_flags; 132 133 if (argc == 3) { 134 if (strcmp(argv[1], "set") == 0) { 135 new_flags = strtol(argv[2], &cp, 0); 136 if (cp[0] != '\0') { 137 printf("Invalid flags\n"); 138 } else { 139 printf("Setting cache flags to %#lx\n", 140 new_flags); 141 cache_flags = new_flags; 142 return (CMD_OK); 143 } 144 } 145 } 146 147 printf("usage: cache_flags set <value>\n"); 148 return (CMD_ERROR); 149 } 150 COMMAND_SET(cache_flags, "cache_flags", "Set cache flags", command_cache_flags); 151