// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI hello world
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*
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* Copyright (c) 2016 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* This program demonstrates calling a boottime service.
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* It writes a greeting and the load options to the console.
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*/
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#include <common.h>
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#include <efi_api.h>
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static const efi_guid_t loaded_image_guid = LOADED_IMAGE_GUID;
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static const efi_guid_t fdt_guid = EFI_FDT_GUID;
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static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID;
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static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
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static int hw_memcmp(const void *buf1, const void *buf2, size_t length)
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{
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const u8 *pos1 = buf1;
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const u8 *pos2 = buf2;
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for (; length; --length) {
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if (*pos1 != *pos2)
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return *pos1 - *pos2;
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++pos1;
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++pos2;
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}
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return 0;
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}
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/*
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* Entry point of the EFI application.
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*
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* @handle handle of the loaded image
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* @systable system table
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* @return status code
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*/
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efi_status_t EFIAPI efi_main(efi_handle_t handle,
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struct efi_system_table *systable)
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{
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struct efi_simple_text_output_protocol *con_out = systable->con_out;
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struct efi_boot_services *boottime = systable->boottime;
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struct efi_loaded_image *loaded_image;
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efi_status_t ret;
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efi_uintn_t i;
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u16 rev[] = L"0.0.0";
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con_out->output_string(con_out, L"Hello, world!\n");
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/* Print the revision number */
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rev[0] = (systable->hdr.revision >> 16) + '0';
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rev[4] = systable->hdr.revision & 0xffff;
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for (; rev[4] >= 10;) {
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rev[4] -= 10;
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++rev[2];
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}
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/* Third digit is only to be shown if non-zero */
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if (rev[4])
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rev[4] += '0';
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else
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rev[3] = 0;
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con_out->output_string(con_out, L"Running on UEFI ");
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con_out->output_string(con_out, rev);
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con_out->output_string(con_out, L"\n");
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/* Get the loaded image protocol */
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ret = boottime->handle_protocol(handle, &loaded_image_guid,
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(void **)&loaded_image);
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if (ret != EFI_SUCCESS) {
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con_out->output_string(con_out,
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L"Cannot open loaded image protocol\n");
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goto out;
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}
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/* Find configuration tables */
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for (i = 0; i < systable->nr_tables; ++i) {
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if (!hw_memcmp(&systable->tables[i].guid, &fdt_guid,
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sizeof(efi_guid_t)))
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con_out->output_string(con_out, L"Have device tree\n");
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if (!hw_memcmp(&systable->tables[i].guid, &acpi_guid,
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sizeof(efi_guid_t)))
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con_out->output_string(con_out, L"Have ACPI 2.0 table\n");
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if (!hw_memcmp(&systable->tables[i].guid, &smbios_guid,
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sizeof(efi_guid_t)))
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con_out->output_string(con_out, L"Have SMBIOS table\n");
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}
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/* Output the load options */
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con_out->output_string(con_out, L"Load options: ");
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if (loaded_image->load_options_size && loaded_image->load_options)
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con_out->output_string(con_out,
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(u16 *)loaded_image->load_options);
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else
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con_out->output_string(con_out, L"<none>");
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con_out->output_string(con_out, L"\n");
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out:
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boottime->exit(handle, ret, 0, NULL);
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/* We should never arrive here */
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return ret;
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}
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