2 * Copyright 2014 Svatopluk Kraus <onwahe@gmail.com>
3 * Copyright 2014 Michal Meloun <meloun@miracle.cz>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/sysctl.h>
35 #include <machine/cpu.h>
36 #include <machine/cpuinfo.h>
39 void reinit_mmu(uint32_t ttb, uint32_t aux_clr, uint32_t aux_set);
42 struct cpuinfo cpuinfo =
44 /* Use safe defaults for start */
45 .dcache_line_size = 32,
46 .dcache_line_mask = 31,
47 .icache_line_size = 32,
48 .icache_line_mask = 31,
51 static SYSCTL_NODE(_hw, OID_AUTO, cpu, CTLFLAG_RD, 0,
53 static SYSCTL_NODE(_hw_cpu, OID_AUTO, quirks, CTLFLAG_RD, 0,
58 * Be careful, ACTRL cannot be changed if CPU is started in secure
59 * mode(world) and write to ACTRL can cause exception!
60 * These quirks are intended for optimizing CPU performance, not for
61 * applying errata workarounds. Nobody can expect that CPU with unfixed
62 * errata is stable enough to execute the kernel until quirks are applied.
64 static uint32_t cpu_quirks_actlr_mask;
65 SYSCTL_INT(_hw_cpu_quirks, OID_AUTO, actlr_mask,
66 CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &cpu_quirks_actlr_mask, 0,
67 "Bits to be masked in ACTLR");
69 static uint32_t cpu_quirks_actlr_set;
70 SYSCTL_INT(_hw_cpu_quirks, OID_AUTO, actlr_set,
71 CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &cpu_quirks_actlr_set, 0,
72 "Bits to be set in ACTLR");
75 /* Read and parse CPU id scheme */
80 cpuinfo.midr = cp15_midr_get();
81 /* Test old version id schemes first */
82 if ((cpuinfo.midr & CPU_ID_IMPLEMENTOR_MASK) == CPU_ID_ARM_LTD) {
83 if (CPU_ID_ISOLD(cpuinfo.midr)) {
84 /* obsolete ARMv2 or ARMv3 CPU */
88 if (CPU_ID_IS7(cpuinfo.midr)) {
89 if ((cpuinfo.midr & (1 << 23)) == 0) {
90 /* obsolete ARMv3 CPU */
95 cpuinfo.architecture = 1;
96 cpuinfo.revision = (cpuinfo.midr >> 16) & 0x7F;
98 /* ARM new id scheme */
99 cpuinfo.architecture = (cpuinfo.midr >> 16) & 0x0F;
100 cpuinfo.revision = (cpuinfo.midr >> 20) & 0x0F;
103 /* non ARM -> must be new id scheme */
104 cpuinfo.architecture = (cpuinfo.midr >> 16) & 0x0F;
105 cpuinfo.revision = (cpuinfo.midr >> 20) & 0x0F;
107 /* Parse rest of MIDR */
108 cpuinfo.implementer = (cpuinfo.midr >> 24) & 0xFF;
109 cpuinfo.part_number = (cpuinfo.midr >> 4) & 0xFFF;
110 cpuinfo.patch = cpuinfo.midr & 0x0F;
112 /* CP15 c0,c0 regs 0-7 exist on all CPUs (although aliased with MIDR) */
113 cpuinfo.ctr = cp15_ctr_get();
114 cpuinfo.tcmtr = cp15_tcmtr_get();
116 cpuinfo.tlbtr = cp15_tlbtr_get();
117 cpuinfo.mpidr = cp15_mpidr_get();
118 cpuinfo.revidr = cp15_revidr_get();
121 /* if CPU is not v7 cpu id scheme */
122 if (cpuinfo.architecture != 0xF)
125 cpuinfo.id_pfr0 = cp15_id_pfr0_get();
126 cpuinfo.id_pfr1 = cp15_id_pfr1_get();
127 cpuinfo.id_dfr0 = cp15_id_dfr0_get();
128 cpuinfo.id_afr0 = cp15_id_afr0_get();
129 cpuinfo.id_mmfr0 = cp15_id_mmfr0_get();
130 cpuinfo.id_mmfr1 = cp15_id_mmfr1_get();
131 cpuinfo.id_mmfr2 = cp15_id_mmfr2_get();
132 cpuinfo.id_mmfr3 = cp15_id_mmfr3_get();
133 cpuinfo.id_isar0 = cp15_id_isar0_get();
134 cpuinfo.id_isar1 = cp15_id_isar1_get();
135 cpuinfo.id_isar2 = cp15_id_isar2_get();
136 cpuinfo.id_isar3 = cp15_id_isar3_get();
137 cpuinfo.id_isar4 = cp15_id_isar4_get();
138 cpuinfo.id_isar5 = cp15_id_isar5_get();
140 /* Not yet - CBAR only exist on ARM SMP Cortex A CPUs
141 cpuinfo.cbar = cp15_cbar_get();
143 if (CPU_CT_FORMAT(cpuinfo.ctr) == CPU_CT_ARMV7) {
144 cpuinfo.ccsidr = cp15_ccsidr_get();
145 cpuinfo.clidr = cp15_clidr_get();
148 /* Test if revidr is implemented */
149 if (cpuinfo.revidr == cpuinfo.midr)
152 /* parsed bits of above registers */
154 cpuinfo.outermost_shareability = (cpuinfo.id_mmfr0 >> 8) & 0xF;
155 cpuinfo.shareability_levels = (cpuinfo.id_mmfr0 >> 12) & 0xF;
156 cpuinfo.auxiliary_registers = (cpuinfo.id_mmfr0 >> 20) & 0xF;
157 cpuinfo.innermost_shareability = (cpuinfo.id_mmfr0 >> 28) & 0xF;
159 cpuinfo.mem_barrier = (cpuinfo.id_mmfr2 >> 20) & 0xF;
161 cpuinfo.coherent_walk = (cpuinfo.id_mmfr3 >> 20) & 0xF;
162 cpuinfo.maintenance_broadcast =(cpuinfo.id_mmfr3 >> 12) & 0xF;
164 cpuinfo.generic_timer_ext = (cpuinfo.id_pfr1 >> 16) & 0xF;
165 cpuinfo.virtualization_ext = (cpuinfo.id_pfr1 >> 12) & 0xF;
166 cpuinfo.security_ext = (cpuinfo.id_pfr1 >> 4) & 0xF;
168 cpuinfo.mp_ext = (cpuinfo.mpidr >> 31u) & 0x1;
171 if (CPU_CT_FORMAT(cpuinfo.ctr) == CPU_CT_ARMV7) {
172 cpuinfo.dcache_line_size =
173 1 << (CPU_CT_DMINLINE(cpuinfo.ctr) + 2);
174 cpuinfo.icache_line_size =
175 1 << (CPU_CT_IMINLINE(cpuinfo.ctr) + 2);
177 cpuinfo.dcache_line_size =
178 1 << (CPU_CT_xSIZE_LEN(CPU_CT_DSIZE(cpuinfo.ctr)) + 3);
179 cpuinfo.icache_line_size =
180 1 << (CPU_CT_xSIZE_LEN(CPU_CT_ISIZE(cpuinfo.ctr)) + 3);
182 cpuinfo.dcache_line_mask = cpuinfo.dcache_line_size - 1;
183 cpuinfo.icache_line_mask = cpuinfo.icache_line_size - 1;
189 * Get bits that must be set or cleared in ACLR register.
190 * Note: Bits in ACLR register are IMPLEMENTATION DEFINED.
191 * Its expected that SCU is in operational state before this
192 * function is called.
195 cpuinfo_get_actlr_modifier(uint32_t *actlr_mask, uint32_t *actlr_set)
201 if (cpuinfo.implementer == CPU_IMPLEMENTER_ARM) {
202 switch (cpuinfo.part_number) {
203 case CPU_ARCH_CORTEX_A73:
204 case CPU_ARCH_CORTEX_A72:
205 case CPU_ARCH_CORTEX_A57:
206 case CPU_ARCH_CORTEX_A53:
207 /* Nothing to do for AArch32 */
209 case CPU_ARCH_CORTEX_A17:
210 case CPU_ARCH_CORTEX_A12: /* A12 is merged to A17 */
214 *actlr_mask = (1 << 6);
215 *actlr_set = (1 << 6);
217 case CPU_ARCH_CORTEX_A15:
219 * Enable snoop-delayed exclusive handling
222 *actlr_mask = (1U << 31) |(1 << 6);
223 *actlr_set = (1U << 31) |(1 << 6);
225 case CPU_ARCH_CORTEX_A9:
227 * Disable exclusive L1/L2 cache control
229 * Enable Cache and TLB maintenance broadcast
231 *actlr_mask = (1 << 7) | (1 << 6) | (1 << 0);
232 *actlr_set = (1 << 6) | (1 << 0);
234 case CPU_ARCH_CORTEX_A8:
237 * Enable L1 data cache hardware alias checks
239 *actlr_mask = (1 << 1) | (1 << 0);
240 *actlr_set = (1 << 1);
242 case CPU_ARCH_CORTEX_A7:
246 *actlr_mask = (1 << 6);
247 *actlr_set = (1 << 6);
249 case CPU_ARCH_CORTEX_A5:
251 * Disable exclusive L1/L2 cache control
253 * Enable Cache and TLB maintenance broadcast
255 *actlr_mask = (1 << 7) | (1 << 6) | (1 << 0);
256 *actlr_set = (1 << 6) | (1 << 0);
258 case CPU_ARCH_ARM1176:
260 * Restrict cache size to 16KB
261 * Enable the return stack
262 * Enable dynamic branch prediction
263 * Enable static branch prediction
265 *actlr_mask = (1 << 6) | (1 << 2) | (1 << 1) | (1 << 0);
266 *actlr_set = (1 << 6) | (1 << 2) | (1 << 1) | (1 << 0);
273 /* Reinitialize MMU to final kernel mapping and apply all CPU quirks. */
275 cpuinfo_reinit_mmu(uint32_t ttb)
280 cpuinfo_get_actlr_modifier(&actlr_mask, &actlr_set);
281 actlr_mask |= cpu_quirks_actlr_mask;
282 actlr_set |= cpu_quirks_actlr_set;
283 reinit_mmu(ttb, actlr_mask, actlr_set);
286 #endif /* __ARM_ARCH >= 6 */