AKASHI Takahiro | 2bc27ca | 2020-11-17 09:27:55 +0900 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * EFI Capsule |
| 4 | * |
| 5 | * Copyright (c) 2018 Linaro Limited |
| 6 | * Author: AKASHI Takahiro |
| 7 | */ |
| 8 | |
| 9 | #include <common.h> |
| 10 | #include <efi_loader.h> |
| 11 | #include <efi_variable.h> |
| 12 | #include <fs.h> |
| 13 | #include <malloc.h> |
| 14 | #include <sort.h> |
| 15 | |
| 16 | const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID; |
| 17 | |
| 18 | /** |
| 19 | * get_last_capsule - get the last capsule index |
| 20 | * |
| 21 | * Retrieve the index of the capsule invoked last time from "CapsuleLast" |
| 22 | * variable. |
| 23 | * |
| 24 | * Return: |
| 25 | * * > 0 - the last capsule index invoked |
| 26 | * * 0xffff - on error, or no capsule invoked yet |
| 27 | */ |
| 28 | static __maybe_unused unsigned int get_last_capsule(void) |
| 29 | { |
| 30 | u16 value16[11]; /* "CapsuleXXXX": non-null-terminated */ |
| 31 | char value[11], *p; |
| 32 | efi_uintn_t size; |
| 33 | unsigned long index = 0xffff; |
| 34 | efi_status_t ret; |
| 35 | |
| 36 | size = sizeof(value16); |
| 37 | ret = efi_get_variable_int(L"CapsuleLast", &efi_guid_capsule_report, |
| 38 | NULL, &size, value16, NULL); |
| 39 | if (ret != EFI_SUCCESS || u16_strncmp(value16, L"Capsule", 7)) |
| 40 | goto err; |
| 41 | |
| 42 | p = value; |
| 43 | utf16_utf8_strcpy(&p, value16); |
| 44 | strict_strtoul(&value[7], 16, &index); |
| 45 | err: |
| 46 | return index; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * set_capsule_result - set a result variable |
| 51 | * @capsule: Capsule |
| 52 | * @return_status: Return status |
| 53 | * |
| 54 | * Create and set a result variable, "CapsuleXXXX", for the capsule, |
| 55 | * @capsule. |
| 56 | */ |
| 57 | static __maybe_unused |
| 58 | void set_capsule_result(int index, struct efi_capsule_header *capsule, |
| 59 | efi_status_t return_status) |
| 60 | { |
| 61 | u16 variable_name16[12]; |
| 62 | struct efi_capsule_result_variable_header result; |
| 63 | struct efi_time time; |
| 64 | efi_status_t ret; |
| 65 | |
| 66 | efi_create_indexed_name(variable_name16, "Capsule", index); |
| 67 | |
| 68 | result.variable_total_size = sizeof(result); |
| 69 | result.capsule_guid = capsule->capsule_guid; |
| 70 | ret = EFI_CALL((*efi_runtime_services.get_time)(&time, NULL)); |
| 71 | if (ret == EFI_SUCCESS) |
| 72 | memcpy(&result.capsule_processed, &time, sizeof(time)); |
| 73 | else |
| 74 | memset(&result.capsule_processed, 0, sizeof(time)); |
| 75 | result.capsule_status = return_status; |
| 76 | ret = efi_set_variable(variable_name16, &efi_guid_capsule_report, |
| 77 | EFI_VARIABLE_NON_VOLATILE | |
| 78 | EFI_VARIABLE_BOOTSERVICE_ACCESS | |
| 79 | EFI_VARIABLE_RUNTIME_ACCESS, |
| 80 | sizeof(result), &result); |
| 81 | if (ret) |
| 82 | printf("EFI: creating %ls failed\n", variable_name16); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * efi_update_capsule() - process information from operating system |
| 87 | * @capsule_header_array: Array of virtual address pointers |
| 88 | * @capsule_count: Number of pointers in capsule_header_array |
| 89 | * @scatter_gather_list: Array of physical address pointers |
| 90 | * |
| 91 | * This function implements the UpdateCapsule() runtime service. |
| 92 | * |
| 93 | * See the Unified Extensible Firmware Interface (UEFI) specification for |
| 94 | * details. |
| 95 | * |
| 96 | * Return: status code |
| 97 | */ |
| 98 | efi_status_t EFIAPI efi_update_capsule( |
| 99 | struct efi_capsule_header **capsule_header_array, |
| 100 | efi_uintn_t capsule_count, |
| 101 | u64 scatter_gather_list) |
| 102 | { |
| 103 | struct efi_capsule_header *capsule; |
| 104 | unsigned int i; |
| 105 | efi_status_t ret; |
| 106 | |
| 107 | EFI_ENTRY("%p, %lu, %llu\n", capsule_header_array, capsule_count, |
| 108 | scatter_gather_list); |
| 109 | |
| 110 | if (!capsule_count) { |
| 111 | ret = EFI_INVALID_PARAMETER; |
| 112 | goto out; |
| 113 | } |
| 114 | |
| 115 | ret = EFI_UNSUPPORTED; |
| 116 | for (i = 0, capsule = *capsule_header_array; i < capsule_count; |
| 117 | i++, capsule = *(++capsule_header_array)) { |
| 118 | } |
| 119 | out: |
| 120 | return EFI_EXIT(ret); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * efi_query_capsule_caps() - check if capsule is supported |
| 125 | * @capsule_header_array: Array of virtual pointers |
| 126 | * @capsule_count: Number of pointers in capsule_header_array |
| 127 | * @maximum_capsule_size: Maximum capsule size |
| 128 | * @reset_type: Type of reset needed for capsule update |
| 129 | * |
| 130 | * This function implements the QueryCapsuleCapabilities() runtime service. |
| 131 | * |
| 132 | * See the Unified Extensible Firmware Interface (UEFI) specification for |
| 133 | * details. |
| 134 | * |
| 135 | * Return: status code |
| 136 | */ |
| 137 | efi_status_t EFIAPI efi_query_capsule_caps( |
| 138 | struct efi_capsule_header **capsule_header_array, |
| 139 | efi_uintn_t capsule_count, |
| 140 | u64 *maximum_capsule_size, |
| 141 | u32 *reset_type) |
| 142 | { |
| 143 | struct efi_capsule_header *capsule __attribute__((unused)); |
| 144 | unsigned int i; |
| 145 | efi_status_t ret; |
| 146 | |
| 147 | EFI_ENTRY("%p, %lu, %p, %p\n", capsule_header_array, capsule_count, |
| 148 | maximum_capsule_size, reset_type); |
| 149 | |
| 150 | if (!maximum_capsule_size) { |
| 151 | ret = EFI_INVALID_PARAMETER; |
| 152 | goto out; |
| 153 | } |
| 154 | |
| 155 | *maximum_capsule_size = U64_MAX; |
| 156 | *reset_type = EFI_RESET_COLD; |
| 157 | |
| 158 | ret = EFI_SUCCESS; |
| 159 | for (i = 0, capsule = *capsule_header_array; i < capsule_count; |
| 160 | i++, capsule = *(++capsule_header_array)) { |
| 161 | /* TODO */ |
| 162 | } |
| 163 | out: |
| 164 | return EFI_EXIT(ret); |
| 165 | } |