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kernel add
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/*
* Copyright 2012 Intel Corporation
* Author: Josh Triplett <josh@joshtriplett.org>
*
* Based on the bgrt driver:
* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
* Author: Matthew Garrett
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/efi-bgrt.h>
struct acpi_table_bgrt *bgrt_tab;
void *__initdata bgrt_image;
size_t __initdata bgrt_image_size;
struct bmp_header {
u16 id;
u32 size;
} __packed;
void __init efi_bgrt_init(void)
{
acpi_status status;
void __iomem *image;
bool ioremapped = false;
struct bmp_header bmp_header;
if (acpi_disabled)
return;
status = acpi_get_table("BGRT", 0,
(struct acpi_table_header **)&bgrt_tab);
if (ACPI_FAILURE(status))
return;
if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
pr_err("Ignoring BGRT: invalid length %u (expected %zu)
",
bgrt_tab->header.length, sizeof(*bgrt_tab));
return;
}
if (bgrt_tab->version != 1) {
pr_err("Ignoring BGRT: invalid version %u (expected 1)
",
bgrt_tab->version);
return;
}
if (bgrt_tab->status & 0xfe) {
pr_err("Ignoring BGRT: reserved status bits are non-zero %u
",
bgrt_tab->status);
return;
}
if (bgrt_tab->status != 1) {
pr_debug("Ignoring BGRT: invalid status %u (expected 1)
",
bgrt_tab->status);
return;
}
if (bgrt_tab->image_type != 0) {
pr_err("Ignoring BGRT: invalid image type %u (expected 0)
",
bgrt_tab->image_type);
return;
}
if (!bgrt_tab->image_address) {
pr_err("Ignoring BGRT: null image address
");
return;
}
image = efi_lookup_mapped_addr(bgrt_tab->image_address);
if (!image) {
image = early_ioremap(bgrt_tab->image_address,
sizeof(bmp_header));
ioremapped = true;
if (!image) {
pr_err("Ignoring BGRT: failed to map image header memory
");
return;
}
}
memcpy_fromio(&bmp_header, image, sizeof(bmp_header));
if (ioremapped)
early_iounmap(image, sizeof(bmp_header));
bgrt_image_size = bmp_header.size;
bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
if (!bgrt_image) {
pr_err("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)
",
bgrt_image_size);
return;
}
if (ioremapped) {
image = early_ioremap(bgrt_tab->image_address,
bmp_header.size);
if (!image) {
pr_err("Ignoring BGRT: failed to map image memory
");
kfree(bgrt_image);
bgrt_image = NULL;
return;
}
}
memcpy_fromio(bgrt_image, image, bgrt_image_size);
if (ioremapped)
early_iounmap(image, bmp_header.size);
}
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