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authorAhmad Fatoum <ahmad@a3f.at>2019-11-15 08:52:53 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2019-11-19 11:57:25 +0100
commitd5f14e585c4d07e913f8f52ebd0f22d4d808bee5 (patch)
tree0feb5b64dfcd058ac0a68feca2441b1ce861b85b /commands
parent390bc7834ffcee9fe9b94babf0f313bcc4d3b42d (diff)
downloadbarebox-d5f14e585c4d07e913f8f52ebd0f22d4d808bee5.tar.gz
ARM: psci: factor out smc command into commands/
So far, the smc command was only usable when barebox also provides the secure monitor. It's useful to have it when barebox is a PSCI consumer as well to test whether the secure monitor works. Factor out the code into commands/ in preparation to do so. No functional change. Signed-off-by: Ahmad Fatoum <ahmad@a3f.at> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands')
-rw-r--r--commands/Kconfig15
-rw-r--r--commands/Makefile1
-rw-r--r--commands/smc.c107
3 files changed, 123 insertions, 0 deletions
diff --git a/commands/Kconfig b/commands/Kconfig
index a6db52a..08b3af8 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -1867,6 +1867,21 @@ config CMD_POWEROFF
help
Turn the power off.
+config CMD_SMC
+ bool
+ depends on ARM_PSCI
+ prompt "PSCI test command"
+ default CONFIG_ARM_PSCI_DEBUG
+ help
+ Secure monitor code test command
+
+ Usage: smc [-nic]
+
+ Options:
+ -n Install secure monitor and switch to nonsecure mode
+ -i Show information about installed PSCI version
+ -c Start secondary CPU core
+
config CMD_SPI
bool
depends on SPI
diff --git a/commands/Makefile b/commands/Makefile
index 2f09801..01082de 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_CMD_MEMSET) += memset.o
obj-$(CONFIG_CMD_EDIT) += edit.o
obj-$(CONFIG_CMD_EXEC) += exec.o
obj-$(CONFIG_CMD_SLEEP) += sleep.o
+obj-$(CONFIG_CMD_SMC) += smc.o
obj-$(CONFIG_CMD_MSLEEP) += msleep.o
obj-$(CONFIG_CMD_RESET) += reset.o
obj-$(CONFIG_CMD_POWEROFF) += poweroff.o
diff --git a/commands/smc.c b/commands/smc.c
new file mode 100644
index 0000000..2a00e15
--- /dev/null
+++ b/commands/smc.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <common.h>
+#include <command.h>
+#include <getopt.h>
+
+#include <asm/psci.h>
+#include <asm/secure.h>
+#include <linux/arm-smccc.h>
+
+void second_entry(void)
+{
+ struct arm_smccc_res res;
+
+ psci_printf("2nd CPU online, now turn off again\n");
+
+ arm_smccc_smc(ARM_PSCI_0_2_FN_CPU_OFF,
+ 0, 0, 0, 0, 0, 0, 0, &res);
+
+ psci_printf("2nd CPU still alive?\n");
+
+ while (1);
+}
+
+static const char *psci_xlate_str(long err)
+{
+ static char errno_string[sizeof "error 0x123456789ABCDEF0"];
+
+ switch(err)
+ {
+ case ARM_PSCI_RET_SUCCESS:
+ return "Success";
+ case ARM_PSCI_RET_NOT_SUPPORTED:
+ return "Operation not supported";
+ case ARM_PSCI_RET_INVAL:
+ return "Invalid argument";
+ case ARM_PSCI_RET_DENIED:
+ return "Operation not permitted";
+ case ARM_PSCI_RET_ALREADY_ON:
+ return "CPU already on";
+ case ARM_PSCI_RET_ON_PENDING:
+ return "CPU_ON in progress";
+ case ARM_PSCI_RET_INTERNAL_FAILURE:
+ return "Internal failure";
+ case ARM_PSCI_RET_NOT_PRESENT:
+ return "Trusted OS not present on core";
+ case ARM_PSCI_RET_DISABLED:
+ return "CPU is disabled";
+ case ARM_PSCI_RET_INVALID_ADDRESS:
+ return "Bad address";
+ }
+
+ sprintf(errno_string, "error 0x%lx", err);
+ return errno_string;
+}
+
+static int do_smc(int argc, char *argv[])
+{
+ long ret;
+ int opt;
+ struct arm_smccc_res res = {
+ .a0 = 0xdeadbee0,
+ .a1 = 0xdeadbee1,
+ .a2 = 0xdeadbee2,
+ .a3 = 0xdeadbee3,
+ };
+
+ if (argc < 2)
+ return COMMAND_ERROR_USAGE;
+
+ while ((opt = getopt(argc, argv, "nic")) > 0) {
+ switch (opt) {
+ case 'n':
+ armv7_secure_monitor_install();
+ break;
+ case 'i':
+ arm_smccc_smc(ARM_PSCI_0_2_FN_PSCI_VERSION,
+ 0, 0, 0, 0, 0, 0, 0, &res);
+ printf("found psci version %ld.%ld\n", res.a0 >> 16, res.a0 & 0xffff);
+ break;
+ case 'c':
+ arm_smccc_smc(ARM_PSCI_0_2_FN_CPU_ON,
+ 1, (unsigned long)second_entry, 0, 0, 0, 0, 0, &res);
+ ret = (long)res.a0;
+ printf("CPU_ON returns with: %s\n", psci_xlate_str(ret));
+ if (ret)
+ return COMMAND_ERROR;
+ }
+ }
+
+
+ return 0;
+}
+BAREBOX_CMD_HELP_START(smc)
+BAREBOX_CMD_HELP_TEXT("Secure monitor code test command")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-n", "Install secure monitor and switch to nonsecure mode")
+BAREBOX_CMD_HELP_OPT ("-i", "Show information about installed PSCI version")
+BAREBOX_CMD_HELP_OPT ("-c", "Start secondary CPU core")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(smc)
+ .cmd = do_smc,
+ BAREBOX_CMD_DESC("secure monitor test command")
+ BAREBOX_CMD_GROUP(CMD_GRP_MISC)
+BAREBOX_CMD_END