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>
57 char machine[] = "riscv";
59 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0,
65 const char *cpu_impl_name;
66 const char *cpu_part_name;
69 struct cpu_desc cpu_desc[MAXCPU];
73 const char *part_name;
75 #define CPU_PART_NONE { -1, "Unknown Processor" }
77 struct cpu_implementers {
79 const char *impl_name;
81 #define CPU_IMPLEMENTER_NONE { 0, "Unknown Implementer" }
86 static const struct cpu_parts cpu_parts_std[] = {
87 { CPU_PART_RV32, "RV32" },
88 { CPU_PART_RV64, "RV64" },
89 { CPU_PART_RV128, "RV128" },
96 const struct cpu_implementers cpu_implementers[] = {
97 { CPU_IMPL_UCB_ROCKET, "UC Berkeley Rocket" },
103 * The ISA string is made up of a small prefix (e.g. rv64) and up to 26 letters
104 * indicating the presence of the 26 possible standard extensions. Therefore 32
105 * characters will be sufficient.
107 #define ISA_NAME_MAXLEN 32
108 #define ISA_PREFIX ("rv" __XSTRING(__riscv_xlen))
109 #define ISA_PREFIX_LEN (sizeof(ISA_PREFIX) - 1)
112 fill_elf_hwcap(void *dummy __unused)
114 u_long caps[256] = {0};
115 char isa[ISA_NAME_MAXLEN];
121 caps['i'] = caps['I'] = HWCAP_ISA_I;
122 caps['m'] = caps['M'] = HWCAP_ISA_M;
123 caps['a'] = caps['A'] = HWCAP_ISA_A;
125 caps['f'] = caps['F'] = HWCAP_ISA_F;
126 caps['d'] = caps['D'] = HWCAP_ISA_D;
128 caps['c'] = caps['C'] = HWCAP_ISA_C;
130 node = OF_finddevice("/cpus");
133 printf("fill_elf_hwcap: Can't find cpus node\n");
138 * Iterate through the CPUs and examine their ISA string. While we
139 * could assign elf_hwcap to be whatever the boot CPU supports, to
140 * handle the (unusual) case of running a system with hetergeneous
141 * ISAs, keep only the extension bits that are common to all harts.
143 for (node = OF_child(node); node > 0; node = OF_peer(node)) {
144 if (!fdt_is_compatible_strict(node, "riscv")) {
146 printf("fill_elf_hwcap: Can't find cpu\n");
150 len = OF_getprop(node, "riscv,isa", isa, sizeof(isa));
151 KASSERT(len <= ISA_NAME_MAXLEN, ("ISA string truncated"));
154 printf("fill_elf_hwcap: "
155 "Can't find riscv,isa property\n");
157 } else if (strncmp(isa, ISA_PREFIX, ISA_PREFIX_LEN) != 0) {
159 printf("fill_elf_hwcap: "
160 "Unsupported ISA string: %s\n", isa);
165 for (i = ISA_PREFIX_LEN; i < len; i++)
166 hwcap |= caps[(unsigned char)isa[i]];
176 SYSINIT(identcpu, SI_SUB_CPU, SI_ORDER_ANY, fill_elf_hwcap, NULL);
182 const struct cpu_parts *cpu_partsp;
192 /* TODO: can we get mimpid and misa somewhere ? */
196 cpu = PCPU_GET(cpuid);
198 impl_id = CPU_IMPL(mimpid);
199 for (i = 0; i < nitems(cpu_implementers); i++) {
200 if (impl_id == cpu_implementers[i].impl_id ||
201 cpu_implementers[i].impl_id == 0) {
202 cpu_desc[cpu].cpu_impl = impl_id;
203 cpu_desc[cpu].cpu_impl_name = cpu_implementers[i].impl_name;
204 cpu_partsp = cpu_parts_std;
209 part_id = CPU_PART(misa);
210 for (i = 0; &cpu_partsp[i] != NULL; i++) {
211 if (part_id == cpu_partsp[i].part_id ||
212 cpu_partsp[i].part_id == -1) {
213 cpu_desc[cpu].cpu_part_num = part_id;
214 cpu_desc[cpu].cpu_part_name = cpu_partsp[i].part_name;
219 /* Print details for boot CPU or if we want verbose output */
220 if (cpu == 0 || bootverbose) {
221 printf("CPU(%d): %s %s\n", cpu,
222 cpu_desc[cpu].cpu_impl_name,
223 cpu_desc[cpu].cpu_part_name);