Provide a command to display information about the SBI implementation.
The output might look like:
=> sbi SBI 0.2 OpenSBI Extensions: sbi_set_timer sbi_console_putchar sbi_console_getchar sbi_clear_ipi sbi_send_ipi sbi_remote_fence_i sbi_remote_sfence_vma sbi_remote_sfence_vma_asid sbi_shutdown SBI Base Functionality Timer Extension IPI Extension RFENCE Extension Hart State Management Extension
The command can be used to construct a unit test checking that the communication with the SEE is working.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- v2: provide a non-blank long help text --- arch/riscv/include/asm/sbi.h | 2 + arch/riscv/lib/sbi.c | 36 ++++++++++++++++ cmd/Kconfig | 6 +++ cmd/riscv/Makefile | 1 + cmd/riscv/sbi.c | 82 ++++++++++++++++++++++++++++++++++++ 5 files changed, 127 insertions(+) create mode 100644 cmd/riscv/sbi.c
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index 08e1ac0c0e..53ca316180 100644 --- a/arch/riscv/include/asm/sbi.h +++ b/arch/riscv/include/asm/sbi.h @@ -115,6 +115,8 @@ void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask, unsigned long asid); #endif void sbi_set_timer(uint64_t stime_value); +long sbi_get_spec_version(void); +int sbi_get_impl_id(void); int sbi_probe_extension(int ext);
#endif diff --git a/arch/riscv/lib/sbi.c b/arch/riscv/lib/sbi.c index 8fbc23839d..920889ed13 100644 --- a/arch/riscv/lib/sbi.c +++ b/arch/riscv/lib/sbi.c @@ -53,6 +53,42 @@ void sbi_set_timer(uint64_t stime_value) #endif }
+/** + * sbi_get_spec_version() - get current SBI specification version + * + * Return: version id + */ +long sbi_get_spec_version(void) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_SPEC_VERSION, + 0, 0, 0, 0, 0, 0); + if (!ret.error) + if (ret.value) + return ret.value; + + return -ENOTSUPP; +} + +/** + * sbi_get_impl_id() - get SBI implemenation ID + * + * Return: implementation ID + */ +int sbi_get_impl_id(void) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_ID, + 0, 0, 0, 0, 0, 0); + if (!ret.error) + if (ret.value) + return ret.value; + + return -ENOTSUPP; +} + /** * sbi_probe_extension() - Check if an SBI extension ID is supported or not. * @extid: The extension ID to be probed. diff --git a/cmd/Kconfig b/cmd/Kconfig index 9ad511aa17..48c08cbc0b 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -270,6 +270,12 @@ config SPL_CMD_TLV_EEPROM help Read system EEPROM data block in ONIE Tlvinfo format from SPL.
+config CMD_SBI + bool "SBI information" + depends on RISCV_SMODE + help + Display information about the SBI implementation. + endmenu
menu "Boot commands" diff --git a/cmd/riscv/Makefile b/cmd/riscv/Makefile index 24df023ece..1e6ac364e3 100644 --- a/cmd/riscv/Makefile +++ b/cmd/riscv/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0+
obj-$(CONFIG_CMD_EXCEPTION) += exception.o +obj-$(CONFIG_CMD_SBI) += sbi.o diff --git a/cmd/riscv/sbi.c b/cmd/riscv/sbi.c new file mode 100644 index 0000000000..7c9151f436 --- /dev/null +++ b/cmd/riscv/sbi.c @@ -0,0 +1,82 @@ +// 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_ext { + const u32 id; + const char *name; +}; + +static struct sbi_ext extensions[] = { + { 0x00000000, "sbi_set_timer" }, + { 0x00000001, "sbi_console_putchar" }, + { 0x00000002, "sbi_console_getchar" }, + { 0x00000003, "sbi_clear_ipi" }, + { 0x00000004, "sbi_send_ipi" }, + { 0x00000005, "sbi_remote_fence_i" }, + { 0x00000006, "sbi_remote_sfence_vma" }, + { 0x00000007, "sbi_remote_sfence_vma_asid" }, + { 0x00000008, "sbi_shutdown" }, + { 0x00000010, "SBI Base Functionality" }, + { 0x54494D45, "Timer Extension" }, + { 0x00735049, "IPI Extension" }, + { 0x52464E43, "RFENCE Extension" }, + { 0x0048534D, "Hart State Management Extension" }, +}; + +static int do_sbi(struct cmd_tbl *cmdtp, int flag, int argc, + char *const argv[]) +{ + int i; + long ret; + + ret = sbi_get_spec_version(); + if (ret >= 0) + printf("SBI %ld.%ld\n", ret >> 24, ret &0xffffff); + ret = sbi_get_impl_id(); + if (ret >= 0) { + switch (ret) { + case 0: + printf("Berkeley Boot Loader (BBL)\n"); + break; + case 1: + printf("OpenSBI\n"); + break; + case 2: + printf("Xvisor\n"); + break; + case 3: + printf("KVM\n"); + break; + default: + printf("Unknown implementation\n"); + break; + } + } + 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; +} + +#ifdef CONFIG_SYS_LONGHELP +static char sbi_help_text[] = + "- display SBI spec version, implementation, and available extensions"; + +#endif + +U_BOOT_CMD_COMPLETE( + sbi, 2, 0, do_sbi, + "display SBI information", + sbi_help_text, NULL +); -- 2.28.0