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cmd: smccc: Implement SMCCC 1.2 support

Message ID 20260901235947.350315-1-marek.vasut+renesas@mailbox.org
State New
Delegated to: Tom Rini
Headers show
Series cmd: smccc: Implement SMCCC 1.2 support | expand

Commit Message

Marek Vasut Sept. 1, 2026, 11:58 p.m. UTC 
Introduce command "smc64" available on ARM64 only, which uses SMCCC 1.2
to exchange up to 18 registers between caller and callee. This is useful
when interacting with e.g. Hafnium or OPTEE-OS via FFA.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
---
Cc: Tom Rini <trini@konsulko.com>
Cc: u-boot@lists.u-boot-project.org
---
 cmd/smccc.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
diff mbox series

Patch

diff --git a/cmd/smccc.c b/cmd/smccc.c
index fa04bb05ca4..ed42ee19c0c 100644
--- a/cmd/smccc.c
+++ b/cmd/smccc.c
@@ -49,6 +49,45 @@  static int do_call(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
+#ifdef CONFIG_ARM64
+static int do_smc64(struct cmd_tbl *cmdtp, int flag, int argc,
+		     char *const argv[])
+{
+	struct arm_smccc_1_2_regs args, res;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	args.a0 = hextoul(argv[1], NULL);
+	args.a1 = argc > 2 ? hextoul(argv[2], NULL) : 0;
+	args.a2 = argc > 3 ? hextoul(argv[3], NULL) : 0;
+	args.a3 = argc > 4 ? hextoul(argv[4], NULL) : 0;
+	args.a4 = argc > 5 ? hextoul(argv[5], NULL) : 0;
+	args.a5 = argc > 6 ? hextoul(argv[6], NULL) : 0;
+	args.a6 = argc > 7 ? hextoul(argv[7], NULL) : 0;
+	args.a7 = argc > 8 ? hextoul(argv[8], NULL) : 0;
+	args.a8 = argc > 9 ? hextoul(argv[9], NULL) : 0;
+	args.a9 = argc > 10 ? hextoul(argv[10], NULL) : 0;
+	args.a10 = argc > 11 ? hextoul(argv[11], NULL) : 0;
+	args.a11 = argc > 12 ? hextoul(argv[12], NULL) : 0;
+	args.a12 = argc > 13 ? hextoul(argv[13], NULL) : 0;
+	args.a13 = argc > 14 ? hextoul(argv[14], NULL) : 0;
+	args.a14 = argc > 15 ? hextoul(argv[15], NULL) : 0;
+	args.a15 = argc > 16 ? hextoul(argv[16], NULL) : 0;
+	args.a16 = argc > 17 ? hextoul(argv[17], NULL) : 0;
+	args.a17 = argc > 18 ? hextoul(argv[18], NULL) : 0;
+
+	arm_smccc_1_2_smc(&args, &res);
+
+	printf("Res:  0x%lx 0x%lx 0x%lx 0x%lx : 0x%lx 0x%lx 0x%lx 0x%lx : 0x%lx 0x%lx 0x%lx 0x%lx : 0x%lx 0x%lx 0x%lx 0x%lx : 0x%lx 0x%lx\n",
+		res.a0, res.a1, res.a2, res.a3, res.a4, res.a5, res.a6, res.a7,
+		res.a8, res.a9, res.a10, res.a11, res.a12, res.a13, res.a14, res.a15,
+		res.a16, res.a17);
+
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_CMD_SMC
 U_BOOT_CMD(
 	smc,	9,		2,	do_call,
@@ -58,6 +97,16 @@  U_BOOT_CMD(
 	"  - arg SMC arguments, passed to X1-X6 (default to zero)\n"
 	"  - id  Secure OS ID / Session ID, passed to W7 (defaults to zero)\n"
 );
+
+#ifdef CONFIG_ARM64
+U_BOOT_CMD(
+	smc64,	19,		2,	do_smc64,
+	"Issue a Secure Monitor Call v1.2",
+	"<fid> [arg1 ... arg17]\n"
+	"  - fid Function ID\n"
+	"  - arg SMC arguments, passed to X1-X17 (default to zero)\n"
+);
+#endif
 #endif
 
 #ifdef CONFIG_CMD_HVC