1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * efi_selftest_debug_support
4 *
5 * Copyright (c) 2025 Ying-Chun Liu, Linaro Ltd. <paul.liu@linaro.org>
6 *
7 * Test the EFI_DEBUG_SUPPORT
8 */
9
10 #include <efi_loader.h>
11 #include <efi_selftest.h>
12 #include <linux/sizes.h>
13
14 /**
15 * efi_st_debug_support_execute() - execute test
16 *
17 * Test EFI_DEBUG_SUPPORT tables.
18 *
19 * Return: status code
20 */
efi_st_debug_support_execute(void)21 static int efi_st_debug_support_execute(void)
22 {
23 struct efi_debug_image_info_table_header *efi_st_debug_info_table_header = NULL;
24 efi_guid_t efi_debug_image_info_table_guid = EFI_DEBUG_IMAGE_INFO_TABLE_GUID;
25 struct efi_mem_desc *memory_map;
26 efi_uintn_t map_size = 0;
27 efi_uintn_t map_key;
28 efi_uintn_t desc_size;
29 u32 desc_version;
30 efi_status_t ret;
31
32 /* get EFI_DEBUG_IMAGE_INFO_TABLE */
33 efi_st_debug_info_table_header = efi_st_get_config_table(&efi_debug_image_info_table_guid);
34
35 if (!efi_st_debug_info_table_header) {
36 efi_st_error("Missing EFI_DEBUG_IMAGE_INFO_TABLE\n");
37 return EFI_ST_FAILURE;
38 }
39
40 /* Load memory map */
41 ret = st_boottime->get_memory_map(&map_size, NULL, &map_key, &desc_size,
42 &desc_version);
43 if (ret != EFI_BUFFER_TOO_SMALL) {
44 efi_st_error
45 ("GetMemoryMap did not return EFI_BUFFER_TOO_SMALL\n");
46 return EFI_ST_FAILURE;
47 }
48 /* Allocate extra space for newly allocated memory */
49 map_size += sizeof(struct efi_mem_desc);
50 ret = st_boottime->allocate_pool(EFI_BOOT_SERVICES_DATA, map_size,
51 (void **)&memory_map);
52 if (ret != EFI_SUCCESS) {
53 efi_st_error("AllocatePool failed\n");
54 return EFI_ST_FAILURE;
55 }
56 ret = st_boottime->get_memory_map(&map_size, memory_map, &map_key,
57 &desc_size, &desc_version);
58 if (ret != EFI_SUCCESS) {
59 efi_st_error("GetMemoryMap failed\n");
60 return EFI_ST_FAILURE;
61 }
62 /* Find the system table pointer */
63 for (efi_uintn_t i = 0; map_size; ++i, map_size -= desc_size) {
64 struct efi_mem_desc *entry = &memory_map[i];
65 u64 end;
66
67 if (entry->type != EFI_RUNTIME_SERVICES_DATA)
68 continue;
69
70 end = entry->physical_start +
71 (entry->num_pages << EFI_PAGE_SHIFT);
72 for (u64 pos = ALIGN(entry->physical_start, SZ_4M);
73 pos <= end; pos += SZ_4M) {
74 struct efi_system_table_pointer *systab_pointer =
75 (void *)(uintptr_t)pos;
76
77 /* check for overflow */
78 if (pos < entry->physical_start)
79 break;
80 if (systab_pointer->signature ==
81 EFI_SYSTEM_TABLE_SIGNATURE) {
82 if (systab_pointer->efi_system_table_base !=
83 (uintptr_t)st_systable) {
84 efi_st_error("Wrong system table address\n");
85 ret = EFI_ST_FAILURE;
86 goto out;
87 }
88 ret = EFI_ST_SUCCESS;
89 goto out;
90 }
91 }
92 }
93 efi_st_error("System table pointer not found\n");
94 ret = EFI_ST_FAILURE;
95
96 out:
97 st_boottime->free_pool(memory_map);
98
99 return ret;
100 }
101
102 EFI_UNIT_TEST(debug_support) = {
103 .name = "debug_support",
104 .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
105 .execute = efi_st_debug_support_execute,
106 };
107