mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-12 22:26:16 +09:00
87fc275cac
The UEFI spec defines that a line feed moves the cursor to the next line and (only) a carriage return moves the cursor to the beginning of the line. So we should issue CR LF when we want to get to the start of the next line. Add some comments. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
// 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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/**
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* hw_memcmp() - compare memory areas
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*
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* @buf1: pointer to first area
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* @buf2: pointer to second area
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* @length: number of bytes to compare
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* Return: 0 if both memory areas are the same, otherwise the sign of the
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* result value is the same as the sign of ghe difference between
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* the first differing pair of bytes taken as u8.
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*/
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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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* efi_main() - 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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/* UEFI requires CR LF */
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con_out->output_string(con_out, L"Hello, world!\r\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"\r\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
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(con_out, L"Cannot open loaded image protocol\r\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
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(con_out, L"Have device tree\r\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
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(con_out, L"Have ACPI 2.0 table\r\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
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(con_out, L"Have SMBIOS table\r\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"\r\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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