The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2019 Mitchell Horne <mhorne@FreeBSD.org>
    5  *
    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/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/types.h>
   34 
   35 #include <machine/md_var.h>
   36 #include <machine/sbi.h>
   37 
   38 /* SBI Implementation-Specific Definitions */
   39 #define OPENSBI_VERSION_MAJOR_OFFSET    16
   40 #define OPENSBI_VERSION_MINOR_MASK      0xFFFF
   41 
   42 u_long sbi_spec_version;
   43 u_long sbi_impl_id;
   44 u_long sbi_impl_version;
   45 
   46 static struct sbi_ret
   47 sbi_get_spec_version(void)
   48 {
   49         return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_SPEC_VERSION));
   50 }
   51 
   52 static struct sbi_ret
   53 sbi_get_impl_id(void)
   54 {
   55         return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_IMPL_ID));
   56 }
   57 
   58 static struct sbi_ret
   59 sbi_get_impl_version(void)
   60 {
   61         return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_IMPL_VERSION));
   62 }
   63 
   64 static struct sbi_ret
   65 sbi_get_mvendorid(void)
   66 {
   67         return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_MVENDORID));
   68 }
   69 
   70 
   71 static struct sbi_ret
   72 sbi_get_marchid(void)
   73 {
   74         return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_MARCHID));
   75 }
   76 
   77 static struct sbi_ret
   78 sbi_get_mimpid(void)
   79 {
   80         return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_MIMPID));
   81 }
   82 
   83 void
   84 sbi_print_version(void)
   85 {
   86         u_int major;
   87         u_int minor;
   88 
   89         /* For legacy SBI implementations. */
   90         if (sbi_spec_version == 0) {
   91                 printf("SBI: Unknown (Legacy) Implementation\n");
   92                 printf("SBI Specification Version: 0.1\n");
   93                 return;
   94         }
   95 
   96         switch (sbi_impl_id) {
   97         case (SBI_IMPL_ID_BBL):
   98                 printf("SBI: Berkely Boot Loader %u\n", sbi_impl_version);
   99                 break;
  100         case (SBI_IMPL_ID_OPENSBI):
  101                 major = sbi_impl_version >> OPENSBI_VERSION_MAJOR_OFFSET;
  102                 minor = sbi_impl_version & OPENSBI_VERSION_MINOR_MASK;
  103                 printf("SBI: OpenSBI v%u.%u\n", major, minor);
  104                 break;
  105         default:
  106                 printf("SBI: Unrecognized Implementation: %u\n", sbi_impl_id);
  107                 break;
  108         }
  109 
  110         major = (sbi_spec_version & SBI_SPEC_VERS_MAJOR_MASK) >>
  111             SBI_SPEC_VERS_MAJOR_OFFSET;
  112         minor = (sbi_spec_version & SBI_SPEC_VERS_MINOR_MASK);
  113         printf("SBI Specification Version: %u.%u\n", major, minor);
  114 }
  115 
  116 int
  117 sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv)
  118 {
  119         struct sbi_ret ret;
  120 
  121         ret = SBI_CALL3(SBI_EXT_ID_HSM, SBI_HSM_HART_START, hart, start_addr, priv);
  122         return (ret.error != 0 ? (int)ret.error : 0);
  123 }
  124 
  125 void
  126 sbi_hsm_hart_stop(void)
  127 {
  128         (void)SBI_CALL0(SBI_EXT_ID_HSM, SBI_HSM_HART_STOP);
  129 }
  130 
  131 int
  132 sbi_hsm_hart_status(u_long hart)
  133 {
  134         struct sbi_ret ret;
  135 
  136         ret = SBI_CALL1(SBI_EXT_ID_HSM, SBI_HSM_HART_STATUS, hart);
  137 
  138         return (ret.error != 0 ? (int)ret.error : (int)ret.value);
  139 }
  140 
  141 void
  142 sbi_init(void)
  143 {
  144         struct sbi_ret sret;
  145 
  146         /*
  147          * Get the spec version. For legacy SBI implementations this will
  148          * return an error, otherwise it is guaranteed to succeed.
  149          */
  150         sret = sbi_get_spec_version();
  151         if (sret.error != 0) {
  152                 /* We are running a legacy SBI implementation. */
  153                 sbi_spec_version = 0;
  154                 return;
  155         }
  156 
  157         /* Set the SBI implementation info. */
  158         sbi_spec_version = sret.value;
  159         sbi_impl_id = sbi_get_impl_id().value;
  160         sbi_impl_version = sbi_get_impl_version().value;
  161 
  162         /* Set the hardware implementation info. */
  163         mvendorid = sbi_get_mvendorid().value;
  164         marchid = sbi_get_marchid().value;
  165         mimpid = sbi_get_mimpid().value;
  166 
  167         /*
  168          * Probe for legacy extensions. Currently we rely on all of them
  169          * to be implemented, but this is not guaranteed by the spec.
  170          */
  171         KASSERT(sbi_probe_extension(SBI_SET_TIMER) != 0,
  172             ("SBI doesn't implement sbi_set_timer()"));
  173         KASSERT(sbi_probe_extension(SBI_CONSOLE_PUTCHAR) != 0,
  174             ("SBI doesn't implement sbi_console_putchar()"));
  175         KASSERT(sbi_probe_extension(SBI_CONSOLE_GETCHAR) != 0,
  176             ("SBI doesn't implement sbi_console_getchar()"));
  177         KASSERT(sbi_probe_extension(SBI_CLEAR_IPI) != 0,
  178             ("SBI doesn't implement sbi_clear_ipi()"));
  179         KASSERT(sbi_probe_extension(SBI_SEND_IPI) != 0,
  180             ("SBI doesn't implement sbi_send_ipi()"));
  181         KASSERT(sbi_probe_extension(SBI_REMOTE_FENCE_I) != 0,
  182             ("SBI doesn't implement sbi_remote_fence_i()"));
  183         KASSERT(sbi_probe_extension(SBI_REMOTE_SFENCE_VMA) != 0,
  184             ("SBI doesn't implement sbi_remote_sfence_vma()"));
  185         KASSERT(sbi_probe_extension(SBI_REMOTE_SFENCE_VMA_ASID) != 0,
  186             ("SBI doesn't implement sbi_remote_sfence_vma_asid()"));
  187         KASSERT(sbi_probe_extension(SBI_SHUTDOWN) != 0,
  188             ("SBI doesn't implement sbi_shutdown()"));
  189 }

Cache object: 7c3af0f30817ac9451e2d37f1db48840


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