mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-09-24 16:32:20 +00:00
b6575f34e2
Now that we have generic PSCI reset and shutdown support in place, we can advertise those as EFI Run Time Services, allowing efi applications and OSs to reset and shut down systems. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
142 lines
2.8 KiB
C
142 lines
2.8 KiB
C
/**
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* (C) Copyright 2014, Cavium Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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**/
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#include <asm-offsets.h>
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#include <config.h>
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#include <efi_loader.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 EFI_RUNTIME_TEXT 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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"ldr x7, %7\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]), "m" (args->regs[7])
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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 EFI_RUNTIME_TEXT 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 EFI_RUNTIME_DATA bool use_smc_for_psci = true;
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void __noreturn EFI_RUNTIME_TEXT 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 EFI_RUNTIME_TEXT 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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#ifdef CONFIG_PSCI_RESET
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void reset_misc(void)
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{
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psci_system_reset();
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}
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#ifdef CONFIG_EFI_LOADER
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void EFI_RUNTIME_TEXT EFIAPI efi_reset_system(
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enum efi_reset_type reset_type,
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efi_status_t reset_status,
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unsigned long data_size, void *reset_data)
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{
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switch (reset_type) {
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case EFI_RESET_COLD:
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case EFI_RESET_WARM:
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psci_system_reset();
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break;
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case EFI_RESET_SHUTDOWN:
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psci_system_off();
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break;
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}
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while (1) { }
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}
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#endif /* CONFIG_EFI_LOADER */
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#endif /* CONFIG_PSCI_RESET */
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