cmd/riscv/sbi.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * The 'sbi' command displays information about the SBI implementation.
 *
 * Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
 */

#include <common.h>
#include <command.h>
#include <asm/sbi.h>

struct sbi_imp {
	const long id;
	const char *name;
};

struct sbi_ext {
	const u32 id;
	const char *name;
};

static struct sbi_imp implementations[] = {
	{ 0, "Berkeley Boot Loader (BBL)" },
	{ 1, "OpenSBI" },
	{ 2, "Xvisor" },
	{ 3, "KVM" },
	{ 4, "RustSBI" },
	{ 5, "Diosix" },
	{ 6, "Coffer" },
	{ 7, "Xen Project" },
	{ 8, "PolarFire Hart Software Services" },
};

static struct sbi_ext extensions[] = {
	{ SBI_EXT_0_1_SET_TIMER,	      "Set Timer" },
	{ SBI_EXT_0_1_CONSOLE_PUTCHAR,	      "Console Putchar" },
	{ SBI_EXT_0_1_CONSOLE_GETCHAR,	      "Console Getchar" },
	{ SBI_EXT_0_1_CLEAR_IPI,	      "Clear IPI" },
	{ SBI_EXT_0_1_SEND_IPI,		      "Send IPI" },
	{ SBI_EXT_0_1_REMOTE_FENCE_I,	      "Remote FENCE.I" },
	{ SBI_EXT_0_1_REMOTE_SFENCE_VMA,      "Remote SFENCE.VMA" },
	{ SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, "Remote SFENCE.VMA with ASID" },
	{ SBI_EXT_0_1_SHUTDOWN,		      "System Shutdown" },
	{ SBI_EXT_BASE,			      "SBI Base Functionality" },
	{ SBI_EXT_TIME,			      "Timer Extension" },
	{ SBI_EXT_IPI,			      "IPI Extension" },
	{ SBI_EXT_RFENCE,		      "RFENCE Extension" },
	{ SBI_EXT_HSM,			      "Hart State Management Extension" },
	{ SBI_EXT_SRST,			      "System Reset Extension" },
	{ SBI_EXT_PMU,			      "Performance Monitoring Unit Extension" },
	{ SBI_EXT_DBCN,			      "Debug Console Extension" },
	{ SBI_EXT_SUSP,			      "System Suspend Extension" },
	{ SBI_EXT_CPPC,			      "Collaborative Processor Performance Control Extension" },
	{ SBI_EXT_NACL,			      "Nested Acceleration Extension" },
	{ SBI_EXT_STA,			      "Steal-time Accounting Extension" },
};

static int do_sbi(struct cmd_tbl *cmdtp, int flag, int argc,
		  char *const argv[])
{
	int i, impl_id;
	long ret;
	long mvendorid, marchid, mimpid;

	ret = sbi_get_spec_version();
	if (ret < 0) {
		printf("No SBI 0.2+\n");
		return CMD_RET_FAILURE;
	}
	printf("SBI %ld.%ld", ret >> 24, ret & 0xffffff);
	impl_id = sbi_get_impl_id();
	if (impl_id >= 0) {
		for (i = 0; i < ARRAY_SIZE(implementations); ++i) {
			if (impl_id == implementations[i].id) {
				long vers;

				printf("\n%s ", implementations[i].name);
				ret = sbi_get_impl_version(&vers);
				if (ret < 0)
					break;
				switch (impl_id) {
				case 1: /* OpenSBI */
					printf("%ld.%ld",
					       vers >> 16, vers & 0xffff);
					break;
				case 3: /* KVM */
				case 4: /* RustSBI */
					printf("%ld.%ld.%ld",
					       vers >> 16,
					       (vers >> 8) & 0xff,
					       vers & 0xff);
					break;
				default:
					printf("0x%lx", vers);
					break;
				}
				break;
			}
		}
		if (i == ARRAY_SIZE(implementations))
			printf("Unknown implementation ID %ld", ret);
	}
	printf("\nMachine:\n");
	ret = sbi_get_mvendorid(&mvendorid);
	if (!ret)
		printf("  Vendor ID %lx\n", mvendorid);
	ret = sbi_get_marchid(&marchid);
	if (!ret)
		printf("  Architecture ID %lx\n", marchid);
	ret = sbi_get_mimpid(&mimpid);
	if (!ret)
		printf("  Implementation ID %lx\n", mimpid);
	printf("Extensions:\n");
	for (i = 0; i < ARRAY_SIZE(extensions); ++i) {
		ret = sbi_probe_extension(extensions[i].id);
		if (ret > 0)
			printf("  %s\n", extensions[i].name);
	}
	return 0;
}

U_BOOT_LONGHELP(sbi,
	"- display SBI spec version, implementation, and available extensions");

U_BOOT_CMD_COMPLETE(
	sbi, 1, 0, do_sbi,
	"display SBI information",
	sbi_help_text, NULL
);