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 #include <sys/param.h> 30 31 #include <machine/armreg.h> 32 #include <machine/atomic.h> 33 34 #include <stand.h> 35 36 #include "bootstrap.h" 37 #include "cache.h" 38 39 static long cache_flags; 40 #define CACHE_FLAG_DIC_OFF (1<<0) 41 #define CACHE_FLAG_IDC_OFF (1<<1) 42 43 static bool 44 get_cache_dic(uint64_t ctr) 45 { 46 if ((cache_flags & CACHE_FLAG_DIC_OFF) != 0) { 47 return (false); 48 } 49 50 return (CTR_DIC_VAL(ctr) != 0); 51 } 52 53 static bool 54 get_cache_idc(uint64_t ctr) 55 { 56 if ((cache_flags & CACHE_FLAG_IDC_OFF) != 0) { 57 return (false); 58 } 59 60 return (CTR_IDC_VAL(ctr) != 0); 61 } 62 63 static unsigned int 64 get_dcache_line_size(uint64_t ctr) 65 { 66 unsigned int dcl_size; 67 68 /* 69 * Relevant field [19:16] is LOG2 70 * of the number of words in DCache line 71 */ 72 dcl_size = CTR_DLINE_SIZE(ctr); 73 74 /* Size of word shifted by cache line size */ 75 return (sizeof(int) << dcl_size); 76 } 77 78 void 79 cpu_flush_dcache(const void *ptr, size_t len) 80 { 81 uint64_t cl_size, ctr; 82 vm_offset_t addr, end; 83 84 /* Accessible from all security levels */ 85 ctr = READ_SPECIALREG(ctr_el0); 86 87 if (get_cache_idc(ctr)) { 88 dsb(ishst); 89 } else { 90 cl_size = get_dcache_line_size(ctr); 91 92 /* Calculate end address to clean */ 93 end = (vm_offset_t)ptr + (vm_offset_t)len; 94 /* Align start address to cache line */ 95 addr = (vm_offset_t)ptr; 96 addr = rounddown2(addr, cl_size); 97 98 for (; addr < end; addr += cl_size) 99 __asm __volatile("dc civac, %0" : : "r" (addr) : 100 "memory"); 101 /* Full system DSB */ 102 dsb(ish); 103 } 104 } 105 106 void 107 cpu_inval_icache(void) 108 { 109 uint64_t ctr; 110 111 /* Accessible from all security levels */ 112 ctr = READ_SPECIALREG(ctr_el0); 113 114 if (get_cache_dic(ctr)) { 115 isb(); 116 } else { 117 __asm __volatile( 118 "ic ialluis \n" 119 "dsb ish \n" 120 "isb \n" 121 : : : "memory"); 122 } 123 } 124 125 static int 126 command_cache_flags(int argc, char *argv[]) 127 { 128 char *cp; 129 long new_flags; 130 131 if (argc == 3) { 132 if (strcmp(argv[1], "set") == 0) { 133 new_flags = strtol(argv[2], &cp, 0); 134 if (cp[0] != '\0') { 135 printf("Invalid flags\n"); 136 } else { 137 printf("Setting cache flags to %#lx\n", 138 new_flags); 139 cache_flags = new_flags; 140 return (CMD_OK); 141 } 142 } 143 } 144 145 printf("usage: cache_flags set <value>\n"); 146 return (CMD_ERROR); 147 } 148 COMMAND_SET(cache_flags, "cache_flags", "Set cache flags", command_cache_flags); 149