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/param.h>
29
30 #include <machine/armreg.h>
31 #include <machine/atomic.h>
32
33 #include <stand.h>
34
35 #include "bootstrap.h"
36 #include "cache.h"
37
38 static long cache_flags;
39 #define CACHE_FLAG_DIC_OFF (1<<0)
40 #define CACHE_FLAG_IDC_OFF (1<<1)
41
42 static bool
get_cache_dic(uint64_t ctr)43 get_cache_dic(uint64_t ctr)
44 {
45 if ((cache_flags & CACHE_FLAG_DIC_OFF) != 0) {
46 return (false);
47 }
48
49 return (CTR_DIC_VAL(ctr) != 0);
50 }
51
52 static bool
get_cache_idc(uint64_t ctr)53 get_cache_idc(uint64_t ctr)
54 {
55 if ((cache_flags & CACHE_FLAG_IDC_OFF) != 0) {
56 return (false);
57 }
58
59 return (CTR_IDC_VAL(ctr) != 0);
60 }
61
62 static unsigned int
get_dcache_line_size(uint64_t ctr)63 get_dcache_line_size(uint64_t ctr)
64 {
65 unsigned int dcl_size;
66
67 /*
68 * Relevant field [19:16] is LOG2
69 * of the number of words in DCache line
70 */
71 dcl_size = CTR_DLINE_SIZE(ctr);
72
73 /* Size of word shifted by cache line size */
74 return (sizeof(int) << dcl_size);
75 }
76
77 void
cpu_flush_dcache(const void * ptr,size_t len)78 cpu_flush_dcache(const void *ptr, size_t len)
79 {
80 uint64_t cl_size, ctr;
81 vm_offset_t addr, end;
82
83 /* Accessible from all security levels */
84 ctr = READ_SPECIALREG(ctr_el0);
85
86 if (get_cache_idc(ctr)) {
87 dsb(ishst);
88 } else {
89 cl_size = get_dcache_line_size(ctr);
90
91 /* Calculate end address to clean */
92 end = (vm_offset_t)ptr + (vm_offset_t)len;
93 /* Align start address to cache line */
94 addr = (vm_offset_t)ptr;
95 addr = rounddown2(addr, cl_size);
96
97 for (; addr < end; addr += cl_size)
98 __asm __volatile("dc civac, %0" : : "r" (addr) :
99 "memory");
100 /* Full system DSB */
101 dsb(ish);
102 }
103 }
104
105 void
cpu_inval_icache(void)106 cpu_inval_icache(void)
107 {
108 uint64_t ctr;
109
110 /* Accessible from all security levels */
111 ctr = READ_SPECIALREG(ctr_el0);
112
113 if (get_cache_dic(ctr)) {
114 isb();
115 } else {
116 __asm __volatile(
117 "ic ialluis \n"
118 "dsb ish \n"
119 "isb \n"
120 : : : "memory");
121 }
122 }
123
124 static int
command_cache_flags(int argc,char * argv[])125 command_cache_flags(int argc, char *argv[])
126 {
127 char *cp;
128 long new_flags;
129
130 if (argc == 3) {
131 if (strcmp(argv[1], "set") == 0) {
132 new_flags = strtol(argv[2], &cp, 0);
133 if (cp[0] != '\0') {
134 printf("Invalid flags\n");
135 } else {
136 printf("Setting cache flags to %#lx\n",
137 new_flags);
138 cache_flags = new_flags;
139 return (CMD_OK);
140 }
141 }
142 }
143
144 printf("usage: cache_flags set <value>\n");
145 return (CMD_ERROR);
146 }
147 COMMAND_SET(cache_flags, "cache_flags", "Set cache flags", command_cache_flags);
148