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92 lines
2.2 KiB
92 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* efibc: control EFI bootloaders which obey LoaderEntryOneShot var |
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* Copyright (c) 2013-2016, Intel Corporation. |
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*/ |
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#define pr_fmt(fmt) "efibc: " fmt |
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#include <linux/efi.h> |
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#include <linux/module.h> |
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#include <linux/reboot.h> |
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#include <linux/slab.h> |
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#include <linux/ucs2_string.h> |
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#define MAX_DATA_LEN 512 |
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static int efibc_set_variable(efi_char16_t *name, efi_char16_t *value, |
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unsigned long len) |
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{ |
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efi_status_t status; |
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status = efi.set_variable(name, &LINUX_EFI_LOADER_ENTRY_GUID, |
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EFI_VARIABLE_NON_VOLATILE |
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| EFI_VARIABLE_BOOTSERVICE_ACCESS |
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| EFI_VARIABLE_RUNTIME_ACCESS, |
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len * sizeof(efi_char16_t), value); |
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if (status != EFI_SUCCESS) { |
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pr_err("failed to set EFI variable: 0x%lx\n", status); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int efibc_reboot_notifier_call(struct notifier_block *notifier, |
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unsigned long event, void *data) |
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{ |
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efi_char16_t *reason = event == SYS_RESTART ? L"reboot" |
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: L"shutdown"; |
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const u8 *str = data; |
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efi_char16_t *wdata; |
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unsigned long l; |
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int ret; |
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ret = efibc_set_variable(L"LoaderEntryRebootReason", reason, |
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ucs2_strlen(reason)); |
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if (ret || !data) |
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return NOTIFY_DONE; |
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wdata = kmalloc(MAX_DATA_LEN * sizeof(efi_char16_t), GFP_KERNEL); |
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if (!wdata) |
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return NOTIFY_DONE; |
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for (l = 0; l < MAX_DATA_LEN - 1 && str[l] != '\0'; l++) |
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wdata[l] = str[l]; |
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wdata[l] = L'\0'; |
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efibc_set_variable(L"LoaderEntryOneShot", wdata, l); |
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kfree(wdata); |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block efibc_reboot_notifier = { |
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.notifier_call = efibc_reboot_notifier_call, |
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}; |
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static int __init efibc_init(void) |
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{ |
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int ret; |
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if (!efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) |
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return -ENODEV; |
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ret = register_reboot_notifier(&efibc_reboot_notifier); |
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if (ret) |
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pr_err("unable to register reboot notifier\n"); |
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return ret; |
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} |
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module_init(efibc_init); |
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static void __exit efibc_exit(void) |
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{ |
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unregister_reboot_notifier(&efibc_reboot_notifier); |
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} |
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module_exit(efibc_exit); |
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MODULE_AUTHOR("Jeremy Compostella <[email protected]>"); |
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MODULE_AUTHOR("Matt Gumbel <[email protected]"); |
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MODULE_DESCRIPTION("EFI Bootloader Control"); |
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MODULE_LICENSE("GPL v2");
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