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efi_driver: provide SBI based runtime system reset

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On RISC-V systems system the Supervisory Binary Interface provides system
reset and poweroff. Use it at EFI runtime.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt 2024-02-12 17:18:37 +01:00
parent c9f368b597
commit ee446e15fb
3 changed files with 31 additions and 1 deletions
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1
lib/efi_driver/Makefile
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@ -9,3 +9,4 @@ obj-y += efi_uclass.o
ifeq ($(CONFIG_PARTITIONS),y)
obj-y += efi_block_device.o
endif
obj-$(CONFIG_SYSRESET_SBI) += efi_reset_riscv.o

29
lib/efi_driver/efi_reset_riscv.c Normal file
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@ -0,0 +1,29 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <efi_loader.h>
#include <asm/sbi.h>
void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type reset_type,
efi_status_t reset_status,
unsigned long data_size,
void *reset_data)
{
register unsigned long eid asm("a7") = SBI_EXT_SRST;
register unsigned long fid asm("a6") = SBI_EXT_SRST_RESET;
register unsigned long type asm("a0");
register unsigned long reason asm("a1") = SBI_SRST_RESET_REASON_NONE;
switch (reset_type) {
case EFI_RESET_WARM:
type = SBI_SRST_RESET_TYPE_WARM_REBOOT;
break;
case EFI_RESET_SHUTDOWN:
type = SBI_SRST_RESET_TYPE_SHUTDOWN;
break;
default:
type = SBI_SRST_RESET_TYPE_COLD_REBOOT;
break;
}
asm volatile ("ecall\n"
: : "r" (eid), "r" (fid), "r" (type), "r" (reason));
}

2
lib/efi_loader/Kconfig
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@ -366,7 +366,7 @@ config EFI_HAVE_RUNTIME_RESET
bool
default y
depends on ARCH_BCM283X || FSL_LAYERSCAPE || PSCI_RESET || \
SANDBOX || SYSRESET_X86
SANDBOX || SYSRESET_SBI || SYSRESET_X86
config EFI_GRUB_ARM32_WORKAROUND
bool "Workaround for GRUB on 32bit ARM"