99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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*
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* EFI information obtained here:
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* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
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*
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* Common EFI functions
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*/
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#include <common.h>
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#include <debug_uart.h>
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#include <errno.h>
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#include <linux/err.h>
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#include <linux/types.h>
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#include <efi.h>
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#include <efi_api.h>
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/*
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* Unfortunately we cannot access any code outside what is built especially
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* for the stub. lib/string.c is already being built for the U-Boot payload
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* so it uses the wrong compiler flags. Add our own memset() here.
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*/
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static void efi_memset(void *ptr, int ch, int size)
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{
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char *dest = ptr;
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while (size-- > 0)
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*dest++ = ch;
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}
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/*
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* Since the EFI stub cannot access most of the U-Boot code, add our own
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* simple console output functions here. The EFI app will not use these since
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* it can use the normal console.
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*/
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void efi_putc(struct efi_priv *priv, const char ch)
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{
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struct efi_simple_text_output_protocol *con = priv->sys_table->con_out;
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uint16_t ucode[2];
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ucode[0] = ch;
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ucode[1] = '\0';
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con->output_string(con, ucode);
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}
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void efi_puts(struct efi_priv *priv, const char *str)
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{
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while (*str)
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efi_putc(priv, *str++);
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}
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int efi_init(struct efi_priv *priv, const char *banner, efi_handle_t image,
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struct efi_system_table *sys_table)
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{
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efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
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struct efi_boot_services *boot = sys_table->boottime;
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struct efi_loaded_image *loaded_image;
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int ret;
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efi_memset(priv, '\0', sizeof(*priv));
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priv->sys_table = sys_table;
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priv->boot = sys_table->boottime;
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priv->parent_image = image;
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priv->run = sys_table->runtime;
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efi_puts(priv, "U-Boot EFI ");
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efi_puts(priv, banner);
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efi_putc(priv, ' ');
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ret = boot->open_protocol(priv->parent_image, &loaded_image_guid,
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(void **)&loaded_image, priv->parent_image,
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NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (ret) {
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efi_puts(priv, "Failed to get loaded image protocol\n");
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return ret;
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}
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priv->image_data_type = loaded_image->image_data_type;
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return 0;
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}
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void *efi_malloc(struct efi_priv *priv, int size, efi_status_t *retp)
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{
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struct efi_boot_services *boot = priv->boot;
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void *buf = NULL;
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*retp = boot->allocate_pool(priv->image_data_type, size, &buf);
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return buf;
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}
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void efi_free(struct efi_priv *priv, void *ptr)
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{
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struct efi_boot_services *boot = priv->boot;
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boot->free_pool(ptr);
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}
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