2 * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
5 * Portions of this software were developed by SRI International and the
6 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
7 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
9 * Portions of this software were developed by the University of Cambridge
10 * Computer Laboratory as part of the CTSRD Project, with support from the
11 * UK Higher Education Innovation Fund (HEIF).
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include "opt_platform.h"
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
44 #include <sys/sysctl.h>
46 #include <machine/cpu.h>
47 #include <machine/cpufunc.h>
48 #include <machine/elf.h>
49 #include <machine/md_var.h>
50 #include <machine/trap.h>
53 #include <dev/fdt/fdt_common.h>
54 #include <dev/ofw/openfirm.h>
55 #include <dev/ofw/ofw_bus_subr.h>
58 char machine[] = "riscv";
60 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0,
63 /* Hardware implementation info. These values may be empty. */
64 register_t mvendorid; /* The CPU's JEDEC vendor ID */
65 register_t marchid; /* The architecture ID */
66 register_t mimpid; /* The implementation ID */
71 const char *cpu_impl_name;
72 const char *cpu_part_name;
75 struct cpu_desc cpu_desc[MAXCPU];
79 const char *part_name;
81 #define CPU_PART_NONE { -1, "Unknown Processor" }
83 struct cpu_implementers {
85 const char *impl_name;
87 #define CPU_IMPLEMENTER_NONE { 0, "Unknown Implementer" }
92 static const struct cpu_parts cpu_parts_std[] = {
93 { CPU_PART_RV32, "RV32" },
94 { CPU_PART_RV64, "RV64" },
95 { CPU_PART_RV128, "RV128" },
100 * Implementers table.
102 const struct cpu_implementers cpu_implementers[] = {
103 { CPU_IMPL_UCB_ROCKET, "UC Berkeley Rocket" },
104 CPU_IMPLEMENTER_NONE,
109 * The ISA string is made up of a small prefix (e.g. rv64) and up to 26 letters
110 * indicating the presence of the 26 possible standard extensions. Therefore 32
111 * characters will be sufficient.
113 #define ISA_NAME_MAXLEN 32
114 #define ISA_PREFIX ("rv" __XSTRING(__riscv_xlen))
115 #define ISA_PREFIX_LEN (sizeof(ISA_PREFIX) - 1)
118 fill_elf_hwcap(void *dummy __unused)
120 u_long caps[256] = {0};
121 char isa[ISA_NAME_MAXLEN];
127 caps['i'] = caps['I'] = HWCAP_ISA_I;
128 caps['m'] = caps['M'] = HWCAP_ISA_M;
129 caps['a'] = caps['A'] = HWCAP_ISA_A;
131 caps['f'] = caps['F'] = HWCAP_ISA_F;
132 caps['d'] = caps['D'] = HWCAP_ISA_D;
134 caps['c'] = caps['C'] = HWCAP_ISA_C;
136 node = OF_finddevice("/cpus");
139 printf("fill_elf_hwcap: Can't find cpus node\n");
144 * Iterate through the CPUs and examine their ISA string. While we
145 * could assign elf_hwcap to be whatever the boot CPU supports, to
146 * handle the (unusual) case of running a system with hetergeneous
147 * ISAs, keep only the extension bits that are common to all harts.
149 for (node = OF_child(node); node > 0; node = OF_peer(node)) {
150 /* Skip any non-CPU nodes, such as cpu-map. */
151 if (!ofw_bus_node_is_compatible(node, "riscv"))
154 len = OF_getprop(node, "riscv,isa", isa, sizeof(isa));
155 KASSERT(len <= ISA_NAME_MAXLEN, ("ISA string truncated"));
158 printf("fill_elf_hwcap: "
159 "Can't find riscv,isa property\n");
161 } else if (strncmp(isa, ISA_PREFIX, ISA_PREFIX_LEN) != 0) {
163 printf("fill_elf_hwcap: "
164 "Unsupported ISA string: %s\n", isa);
169 for (i = ISA_PREFIX_LEN; i < len; i++)
170 hwcap |= caps[(unsigned char)isa[i]];
179 SYSINIT(identcpu, SI_SUB_CPU, SI_ORDER_ANY, fill_elf_hwcap, NULL);
185 const struct cpu_parts *cpu_partsp;
194 /* TODO: can we get misa somewhere ? */
197 cpu = PCPU_GET(cpuid);
199 impl_id = CPU_IMPL(mimpid);
200 for (i = 0; i < nitems(cpu_implementers); i++) {
201 if (impl_id == cpu_implementers[i].impl_id ||
202 cpu_implementers[i].impl_id == 0) {
203 cpu_desc[cpu].cpu_impl = impl_id;
204 cpu_desc[cpu].cpu_impl_name = cpu_implementers[i].impl_name;
205 cpu_partsp = cpu_parts_std;
210 part_id = CPU_PART(misa);
211 for (i = 0; &cpu_partsp[i] != NULL; i++) {
212 if (part_id == cpu_partsp[i].part_id ||
213 cpu_partsp[i].part_id == -1) {
214 cpu_desc[cpu].cpu_part_num = part_id;
215 cpu_desc[cpu].cpu_part_name = cpu_partsp[i].part_name;
220 /* Print details for boot CPU or if we want verbose output */
221 if (cpu == 0 || bootverbose) {
222 printf("CPU(%d): %s %s\n", cpu,
223 cpu_desc[cpu].cpu_impl_name,
224 cpu_desc[cpu].cpu_part_name);