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[u-boot] / lib / efi_loader / helloworld.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * EFI hello world
4  *
5  * Copyright (c) 2016 Google, Inc
6  * Written by Simon Glass <sjg@chromium.org>
7  *
8  * This program demonstrates calling a boottime service.
9  * It writes a greeting and the load options to the console.
10  */
11
12 #include <common.h>
13 #include <efi_api.h>
14
15 static const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID;
16 static const efi_guid_t fdt_guid = EFI_FDT_GUID;
17 static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID;
18 static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
19
20 static int hw_memcmp(const void *buf1, const void *buf2, size_t length)
21 {
22         const u8 *pos1 = buf1;
23         const u8 *pos2 = buf2;
24
25         for (; length; --length) {
26                 if (*pos1 != *pos2)
27                         return *pos1 - *pos2;
28                 ++pos1;
29                 ++pos2;
30         }
31         return 0;
32 }
33
34 /*
35  * Entry point of the EFI application.
36  *
37  * @handle      handle of the loaded image
38  * @systable    system table
39  * @return      status code
40  */
41 efi_status_t EFIAPI efi_main(efi_handle_t handle,
42                              struct efi_system_table *systable)
43 {
44         struct efi_simple_text_output_protocol *con_out = systable->con_out;
45         struct efi_boot_services *boottime = systable->boottime;
46         struct efi_loaded_image *loaded_image;
47         efi_status_t ret;
48         efi_uintn_t i;
49         u16 rev[] = L"0.0.0";
50
51         con_out->output_string(con_out, L"Hello, world!\n");
52
53         /* Print the revision number */
54         rev[0] = (systable->hdr.revision >> 16) + '0';
55         rev[4] = systable->hdr.revision & 0xffff;
56         for (; rev[4] >= 10;) {
57                 rev[4] -= 10;
58                 ++rev[2];
59         }
60         /* Third digit is only to be shown if non-zero */
61         if (rev[4])
62                 rev[4] += '0';
63         else
64                 rev[3] = 0;
65
66         con_out->output_string(con_out, L"Running on UEFI ");
67         con_out->output_string(con_out, rev);
68         con_out->output_string(con_out, L"\n");
69
70         /* Get the loaded image protocol */
71         ret = boottime->handle_protocol(handle, &loaded_image_guid,
72                                         (void **)&loaded_image);
73         if (ret != EFI_SUCCESS) {
74                 con_out->output_string(con_out,
75                                        L"Cannot open loaded image protocol\n");
76                 goto out;
77         }
78         /* Find configuration tables */
79         for (i = 0; i < systable->nr_tables; ++i) {
80                 if (!hw_memcmp(&systable->tables[i].guid, &fdt_guid,
81                                sizeof(efi_guid_t)))
82                         con_out->output_string(con_out, L"Have device tree\n");
83                 if (!hw_memcmp(&systable->tables[i].guid, &acpi_guid,
84                                sizeof(efi_guid_t)))
85                         con_out->output_string(con_out, L"Have ACPI 2.0 table\n");
86                 if (!hw_memcmp(&systable->tables[i].guid, &smbios_guid,
87                                sizeof(efi_guid_t)))
88                         con_out->output_string(con_out, L"Have SMBIOS table\n");
89         }
90         /* Output the load options */
91         con_out->output_string(con_out, L"Load options: ");
92         if (loaded_image->load_options_size && loaded_image->load_options)
93                 con_out->output_string(con_out,
94                                        (u16 *)loaded_image->load_options);
95         else
96                 con_out->output_string(con_out, L"<none>");
97         con_out->output_string(con_out, L"\n");
98
99 out:
100         boottime->exit(handle, ret, 0, NULL);
101
102         /* We should never arrive here */
103         return ret;
104 }