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_imp {
  13         const long id;
  14         const char *name;
  15 };
  16
  17 struct sbi_ext {
  18         const u32 id;
  19         const char *name;
  20 };
  21
  22 static struct sbi_imp implementations[] = {
  23         { 0, "Berkeley Boot Loader (BBL)" },
  24         { 1, "OpenSBI" },
  25         { 2, "Xvisor" },
  26         { 3, "KVM" },
  27         { 4, "RustSBI" },
  28         { 5, "Diosix" },
  29 };
  30
  31 static struct sbi_ext extensions[] = {
  32         { SBI_EXT_0_1_SET_TIMER,              "sbi_set_timer" },
  33         { SBI_EXT_0_1_CONSOLE_PUTCHAR,        "sbi_console_putchar" },
  34         { SBI_EXT_0_1_CONSOLE_GETCHAR,        "sbi_console_getchar" },
  35         { SBI_EXT_0_1_CLEAR_IPI,              "sbi_clear_ipi" },
  36         { SBI_EXT_0_1_SEND_IPI,               "sbi_send_ipi" },
  37         { SBI_EXT_0_1_REMOTE_FENCE_I,         "sbi_remote_fence_i" },
  38         { SBI_EXT_0_1_REMOTE_SFENCE_VMA,      "sbi_remote_sfence_vma" },
  39         { SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, "sbi_remote_sfence_vma_asid" },
  40         { SBI_EXT_0_1_SHUTDOWN,               "sbi_shutdown" },
  41         { SBI_EXT_BASE,                       "SBI Base Functionality" },
  42         { SBI_EXT_TIME,                       "Timer Extension" },
  43         { SBI_EXT_IPI,                        "IPI Extension" },
  44         { SBI_EXT_RFENCE,                     "RFENCE Extension" },
  45         { SBI_EXT_HSM,                        "Hart State Management Extension" },
  46         { SBI_EXT_SRST,                       "System Reset Extension" },
  47 };
  48
  49 static int do_sbi(struct cmd_tbl *cmdtp, int flag, int argc,
  50                   char *const argv[])
  51 {
  52         int i, impl_id;
  53         long ret;
  54
  55         ret = sbi_get_spec_version();
  56         if (ret >= 0)
  57                 printf("SBI %ld.%ld", ret >> 24, ret & 0xffffff);
  58         impl_id = sbi_get_impl_id();
  59         if (impl_id >= 0) {
  60                 for (i = 0; i < ARRAY_SIZE(implementations); ++i) {
  61                         if (impl_id == implementations[i].id) {
  62                                 long vers;
  63
  64                                 printf("\n%s ", implementations[i].name);
  65                                 ret = sbi_get_impl_version(&vers);
  66                                 if (ret < 0)
  67                                         break;
  68                                 if (impl_id == 1)
  69                                         printf("%ld.%ld",
  70                                                vers >> 16, vers & 0xffff);
  71                                 else
  72                                         printf("0x%lx", vers);
  73                                 break;
  74                         }
  75                 }
  76                 if (i == ARRAY_SIZE(implementations))
  77                         printf("Unknown implementation ID %ld", ret);
  78         }
  79         printf("\nExtensions:\n");
  80         for (i = 0; i < ARRAY_SIZE(extensions); ++i) {
  81                 ret = sbi_probe_extension(extensions[i].id);
  82                 if (ret > 0)
  83                         printf("  %s\n", extensions[i].name);
  84         }
  85         return 0;
  86 }
  87
  88 #ifdef CONFIG_SYS_LONGHELP
  89 static char sbi_help_text[] =
  90         "- display SBI spec version, implementation, and available extensions";
  91
  92 #endif
  93
  94 U_BOOT_CMD_COMPLETE(
  95         sbi, 1, 0, do_sbi,
  96         "display SBI information",
  97         sbi_help_text, NULL
  98 );