cmd/riscv/sbi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * The 'sbi' command displays information about the SBI implementation.
   4  *
   5  * Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <asm/sbi.h>
  11
  12 struct sbi_ext {
  13         const u32 id;
  14         const char *name;
  15 };
  16
  17 static struct sbi_ext extensions[] = {
  18         { 0x00000000, "sbi_set_timer" },
  19         { 0x00000001, "sbi_console_putchar" },
  20         { 0x00000002, "sbi_console_getchar" },
  21         { 0x00000003, "sbi_clear_ipi" },
  22         { 0x00000004, "sbi_send_ipi" },
  23         { 0x00000005, "sbi_remote_fence_i" },
  24         { 0x00000006, "sbi_remote_sfence_vma" },
  25         { 0x00000007, "sbi_remote_sfence_vma_asid" },
  26         { 0x00000008, "sbi_shutdown" },
  27         { 0x00000010, "SBI Base Functionality" },
  28         { 0x54494D45, "Timer Extension" },
  29         { 0x00735049, "IPI Extension" },
  30         { 0x52464E43, "RFENCE Extension" },
  31         { 0x0048534D, "Hart State Management Extension" },
  32 };
  33
  34 static int do_sbi(struct cmd_tbl *cmdtp, int flag, int argc,
  35                   char *const argv[])
  36 {
  37         int i;
  38         long ret;
  39
  40         ret = sbi_get_spec_version();
  41         if (ret >= 0)
  42                 printf("SBI %ld.%ld\n", ret >> 24, ret & 0xffffff);
  43         ret = sbi_get_impl_id();
  44         if (ret >= 0) {
  45                 switch (ret) {
  46                 case 0:
  47                         printf("Berkeley Boot Loader (BBL)\n");
  48                         break;
  49                 case 1:
  50                         printf("OpenSBI\n");
  51                         break;
  52                 case 2:
  53                         printf("Xvisor\n");
  54                         break;
  55                 case 3:
  56                         printf("KVM\n");
  57                         break;
  58                 default:
  59                         printf("Unknown implementation\n");
  60                         break;
  61                 }
  62         }
  63         printf("Extensions:\n");
  64         for (i = 0; i < ARRAY_SIZE(extensions); ++i) {
  65                 ret = sbi_probe_extension(extensions[i].id);
  66                 if (ret > 0)
  67                         printf("  %s\n", extensions[i].name);
  68         }
  69         return 0;
  70 }
  71
  72 #ifdef CONFIG_SYS_LONGHELP
  73 static char sbi_help_text[] =
  74         "- display SBI spec version, implementation, and available extensions";
  75
  76 #endif
  77
  78 U_BOOT_CMD_COMPLETE(
  79         sbi, 1, 0, do_sbi,
  80         "display SBI information",
  81         sbi_help_text, NULL
  82 );