2 * Copyright 2012 Intel Corporation
3 * Author: Josh Triplett <josh@joshtriplett.org>
5 * Based on the bgrt driver:
6 * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
7 * Author: Matthew Garrett
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/acpi.h>
16 #include <linux/efi.h>
17 #include <linux/efi-bgrt.h>
19 struct acpi_table_bgrt *bgrt_tab;
20 void *__initdata bgrt_image;
21 size_t __initdata bgrt_image_size;
28 void __init efi_bgrt_init(void)
32 struct bmp_header bmp_header;
37 status = acpi_get_table("BGRT", 0,
38 (struct acpi_table_header **)&bgrt_tab);
39 if (ACPI_FAILURE(status))
42 if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
43 pr_err("Ignoring BGRT: invalid length %u (expected %zu)\n",
44 bgrt_tab->header.length, sizeof(*bgrt_tab));
47 if (bgrt_tab->version != 1) {
48 pr_err("Ignoring BGRT: invalid version %u (expected 1)\n",
52 if (bgrt_tab->status & 0xfe) {
53 pr_err("Ignoring BGRT: reserved status bits are non-zero %u\n",
57 if (bgrt_tab->status != 1) {
58 pr_debug("Ignoring BGRT: invalid status %u (expected 1)\n",
62 if (bgrt_tab->image_type != 0) {
63 pr_err("Ignoring BGRT: invalid image type %u (expected 0)\n",
64 bgrt_tab->image_type);
67 if (!bgrt_tab->image_address) {
68 pr_err("Ignoring BGRT: null image address\n");
72 image = memremap(bgrt_tab->image_address, sizeof(bmp_header), MEMREMAP_WB);
74 pr_err("Ignoring BGRT: failed to map image header memory\n");
78 memcpy(&bmp_header, image, sizeof(bmp_header));
80 bgrt_image_size = bmp_header.size;
82 bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
84 pr_err("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
89 image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
91 pr_err("Ignoring BGRT: failed to map image memory\n");
97 memcpy(bgrt_image, image, bgrt_image_size);