mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-10 13:16:16 +09:00
1721b82c1f
HVC call makes use of 6 mandatory arguments rather than 7 in the same way as SMC calls. The 7th argument is optional (Client ID) for both HVC and SMC but is implemented as 16-bit parameter and register R7 or W7. The aim of this patch is just fix compilation error due to an invalid asm code in the HVC call so that's why the 7th argument is removed. The issue does not report any error in a normal build as hvc_call is not used at all and is optimized by the compiler. Using -O0 triggers the error so the patch is intended to fix issues on a ongoing effor to build U-Boot with -O0. Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@xilinx.com>
115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/**
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* (C) Copyright 2014, Cavium Inc.
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* (C) Copyright 2017, Xilinx Inc.
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*
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**/
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#include <asm-offsets.h>
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#include <config.h>
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#include <version.h>
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#include <asm/macro.h>
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#include <asm/psci.h>
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#include <asm/system.h>
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/*
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* Issue the hypervisor call
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*
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* x0~x7: input arguments
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* x0~x3: output arguments
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*/
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static void hvc_call(struct pt_regs *args)
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{
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asm volatile(
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"ldr x0, %0\n"
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"ldr x1, %1\n"
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"ldr x2, %2\n"
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"ldr x3, %3\n"
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"ldr x4, %4\n"
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"ldr x5, %5\n"
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"ldr x6, %6\n"
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"hvc #0\n"
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"str x0, %0\n"
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"str x1, %1\n"
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"str x2, %2\n"
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"str x3, %3\n"
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: "+m" (args->regs[0]), "+m" (args->regs[1]),
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"+m" (args->regs[2]), "+m" (args->regs[3])
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: "m" (args->regs[4]), "m" (args->regs[5]),
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"m" (args->regs[6])
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: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
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"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
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"x16", "x17");
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}
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/*
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* void smc_call(arg0, arg1...arg7)
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*
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* issue the secure monitor call
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*
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* x0~x7: input arguments
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* x0~x3: output arguments
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*/
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void smc_call(struct pt_regs *args)
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{
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asm volatile(
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"ldr x0, %0\n"
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"ldr x1, %1\n"
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"ldr x2, %2\n"
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"ldr x3, %3\n"
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"ldr x4, %4\n"
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"ldr x5, %5\n"
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"ldr x6, %6\n"
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"smc #0\n"
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"str x0, %0\n"
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"str x1, %1\n"
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"str x2, %2\n"
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"str x3, %3\n"
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: "+m" (args->regs[0]), "+m" (args->regs[1]),
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"+m" (args->regs[2]), "+m" (args->regs[3])
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: "m" (args->regs[4]), "m" (args->regs[5]),
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"m" (args->regs[6])
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: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
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"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
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"x16", "x17");
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}
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/*
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* For now, all systems we support run at least in EL2 and thus
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* trigger PSCI calls to EL3 using SMC. If anyone ever wants to
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* use PSCI on U-Boot running below a hypervisor, please detect
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* this and set the flag accordingly.
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*/
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static const bool use_smc_for_psci = true;
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void __noreturn psci_system_reset(void)
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{
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struct pt_regs regs;
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regs.regs[0] = ARM_PSCI_0_2_FN_SYSTEM_RESET;
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if (use_smc_for_psci)
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smc_call(®s);
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else
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hvc_call(®s);
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while (1)
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;
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}
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void __noreturn psci_system_off(void)
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{
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struct pt_regs regs;
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regs.regs[0] = ARM_PSCI_0_2_FN_SYSTEM_OFF;
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if (use_smc_for_psci)
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smc_call(®s);
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else
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hvc_call(®s);
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while (1)
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;
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}
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