1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2014, Cavium Inc.
4 * (C) Copyright 2017, Xilinx Inc.
8 #include <asm-offsets.h>
11 #include <asm/macro.h>
13 #include <asm/system.h>
16 * Issue the hypervisor call
18 * x0~x7: input arguments
19 * x0~x3: output arguments
21 static void hvc_call(struct pt_regs *args)
37 : "+m" (args->regs[0]), "+m" (args->regs[1]),
38 "+m" (args->regs[2]), "+m" (args->regs[3])
39 : "m" (args->regs[4]), "m" (args->regs[5]),
40 "m" (args->regs[6]), "m" (args->regs[7])
41 : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
42 "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
47 * void smc_call(arg0, arg1...arg7)
49 * issue the secure monitor call
51 * x0~x7: input arguments
52 * x0~x3: output arguments
55 void smc_call(struct pt_regs *args)
70 : "+m" (args->regs[0]), "+m" (args->regs[1]),
71 "+m" (args->regs[2]), "+m" (args->regs[3])
72 : "m" (args->regs[4]), "m" (args->regs[5]),
74 : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
75 "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
80 * For now, all systems we support run at least in EL2 and thus
81 * trigger PSCI calls to EL3 using SMC. If anyone ever wants to
82 * use PSCI on U-Boot running below a hypervisor, please detect
83 * this and set the flag accordingly.
85 static const bool use_smc_for_psci = true;
87 void __noreturn psci_system_reset(void)
91 regs.regs[0] = ARM_PSCI_0_2_FN_SYSTEM_RESET;
102 void __noreturn psci_system_off(void)
106 regs.regs[0] = ARM_PSCI_0_2_FN_SYSTEM_OFF;
108 if (use_smc_for_psci)