FreeBSD/Linux Kernel Cross Reference
sys/riscv/riscv/identcpu.c

     /*-
      * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * Portions of this software were developed by SRI International and the
      * University of Cambridge Computer Laboratory under DARPA/AFRL contract
      * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * Portions of this software were developed by the University of Cambridge
     * Computer Laboratory as part of the CTSRD Project, with support from the
     * UK Higher Education Innovation Fund (HEIF).
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/pcpu.h>
    #include <sys/sysctl.h>
    #include <sys/systm.h>
    
    #include <machine/cpu.h>
    #include <machine/cpufunc.h>
    #include <machine/trap.h>
    
    char machine[] = "riscv";
    
    SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0,
        "Machine class");
    
    struct cpu_desc {
            u_int           cpu_impl;
            u_int           cpu_part_num;
            const char      *cpu_impl_name;
            const char      *cpu_part_name;
    };
    
    struct cpu_desc cpu_desc[MAXCPU];
    
    struct cpu_parts {
            u_int           part_id;
            const char      *part_name;
    };
    #define CPU_PART_NONE   { -1, "Unknown Processor" }
    
    struct cpu_implementers {
            u_int                   impl_id;
            const char              *impl_name;
            /*
             * Part number is implementation defined
             * so each vendor will have its own set of values and names.
             */
            const struct cpu_parts  *cpu_parts;
    };
    #define CPU_IMPLEMENTER_NONE    { 0, "Unknown Implementer", cpu_parts_none }
    
    /*
     * Per-implementer table of (PartNum, CPU Name) pairs.
     */
    /* UC Berkeley */
    static const struct cpu_parts cpu_parts_ucb[] = {
            { CPU_PART_RV32I,       "RV32I" },
            { CPU_PART_RV32E,       "RV32E" },
            { CPU_PART_RV64I,       "RV64I" },
            { CPU_PART_RV128I,      "RV128I" },
            CPU_PART_NONE,
    };
    
    /* Unknown */
    static const struct cpu_parts cpu_parts_none[] = {
            CPU_PART_NONE,
    };
    
    /*
     * Implementers table.
     */
    const struct cpu_implementers cpu_implementers[] = {
            { CPU_IMPL_UCB_ROCKET,  "UC Berkeley Rocket",   cpu_parts_ucb },
           CPU_IMPLEMENTER_NONE,
   };
   
   void
   identify_cpu(void)
   {
           const struct cpu_parts *cpu_partsp;
           uint32_t part_id;
           uint32_t impl_id;
           uint64_t mimpid;
           uint64_t mcpuid;
           u_int cpu;
           size_t i;
   
           cpu_partsp = NULL;
   
           mimpid = machine_command(ECALL_MIMPID_GET, 0);
           mcpuid = machine_command(ECALL_MCPUID_GET, 0);
   
           /* SMPTODO: use mhartid ? */
           cpu = PCPU_GET(cpuid);
   
           impl_id = CPU_IMPL(mimpid);
           for (i = 0; i < nitems(cpu_implementers); i++) {
                   if (impl_id == cpu_implementers[i].impl_id ||
                       cpu_implementers[i].impl_id == 0) {
                           cpu_desc[cpu].cpu_impl = impl_id;
                           cpu_desc[cpu].cpu_impl_name = cpu_implementers[i].impl_name;
                           cpu_partsp = cpu_implementers[i].cpu_parts;
                           break;
                   }
           }
   
           part_id = CPU_PART(mcpuid);
           for (i = 0; &cpu_partsp[i] != NULL; i++) {
                   if (part_id == cpu_partsp[i].part_id ||
                       cpu_partsp[i].part_id == -1) {
                           cpu_desc[cpu].cpu_part_num = part_id;
                           cpu_desc[cpu].cpu_part_name = cpu_partsp[i].part_name;
                           break;
                   }
           }
   
           /* Print details for boot CPU or if we want verbose output */
           if (cpu == 0 || bootverbose) {
                   printf("CPU(%d): %s %s\n", cpu,
                       cpu_desc[cpu].cpu_impl_name,
                       cpu_desc[cpu].cpu_part_name);
           }
   }

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