Patrick Rudolph | 4d66ab5 | 2022-03-03 10:16:35 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #include <stdlib.h> |
| 4 | #include <string.h> |
| 5 | #include <option.h> |
| 6 | #include <smmstore.h> |
| 7 | |
| 8 | #include <Uefi/UefiBaseType.h> |
| 9 | |
| 10 | #include "efivars.h" |
| 11 | |
| 12 | static const EFI_GUID EficorebootNvDataGuid = { |
| 13 | 0xceae4c1d, 0x335b, 0x4685, { 0xa4, 0xa0, 0xfc, 0x4a, 0x94, 0xee, 0xa0, 0x85 } }; |
| 14 | |
| 15 | unsigned int get_uint_option(const char *name, const unsigned int fallback) |
| 16 | { |
| 17 | struct region_device rdev; |
| 18 | enum cb_err ret; |
| 19 | uint32_t var; |
| 20 | uint32_t size; |
| 21 | |
| 22 | if (smmstore_lookup_region(&rdev)) |
| 23 | return fallback; |
| 24 | |
| 25 | var = 0; |
| 26 | size = sizeof(var); |
| 27 | ret = efi_fv_get_option(&rdev, &EficorebootNvDataGuid, name, &var, &size); |
| 28 | if (ret != CB_SUCCESS) |
| 29 | return fallback; |
| 30 | |
| 31 | return var; |
| 32 | } |
| 33 | |
| 34 | enum cb_err set_uint_option(const char *name, unsigned int value) |
| 35 | { |
| 36 | struct region_device rdev; |
| 37 | uint32_t var = value; |
| 38 | |
| 39 | if (smmstore_lookup_region(&rdev)) |
| 40 | return CB_CMOS_OTABLE_DISABLED; |
| 41 | |
| 42 | return efi_fv_set_option(&rdev, &EficorebootNvDataGuid, name, &var, sizeof(var)); |
| 43 | } |