Release 4.10 arch/x86/platform/efi/efi-bgrt.c

/*
 * 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.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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 *image;
	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_notice("Ignoring BGRT: invalid length %u (expected %zu)\n",
		       bgrt_tab->header.length, sizeof(*bgrt_tab));
		return;
	}
	if (bgrt_tab->version != 1) {
		pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
		       bgrt_tab->version);
		return;
	}
	if (bgrt_tab->status & 0xfe) {
		pr_notice("Ignoring BGRT: reserved status bits are non-zero %u\n",
		       bgrt_tab->status);
		return;
	}
	if (bgrt_tab->image_type != 0) {
		pr_notice("Ignoring BGRT: invalid image type %u (expected 0)\n",
		       bgrt_tab->image_type);
		return;
	}
	if (!bgrt_tab->image_address) {
		pr_notice("Ignoring BGRT: null image address\n");
		return;
	}

	image = memremap(bgrt_tab->image_address, sizeof(bmp_header), MEMREMAP_WB);
	if (!image) {
		pr_notice("Ignoring BGRT: failed to map image header memory\n");
		return;
	}

	memcpy(&bmp_header, image, sizeof(bmp_header));
	memunmap(image);
	if (bmp_header.id != 0x4d42) {
		pr_notice("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
			bmp_header.id);
		return;
	}
	bgrt_image_size = bmp_header.size;

	bgrt_image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
	if (!bgrt_image) {
		pr_notice("Ignoring BGRT: failed to map image memory\n");
		bgrt_image = NULL;
		return;
	}

	efi_mem_reserve(bgrt_tab->image_address, bgrt_image_size);
}
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josh triplett
josh triplett
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matt fleming
matt fleming
33
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4
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moshe van der sterre
moshe van der sterre
19
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1
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jan beulich
jan beulich
16
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2
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josh boyer
josh boyer
8
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Overall Contributors
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josh triplett
josh triplett
233
72.36%
2
16.67%
matt fleming
matt fleming
40
12.42%
5
41.67%
jan beulich
jan beulich
21
6.52%
2
16.67%
moshe van der sterre
moshe van der sterre
19
5.90%
1
8.33%
josh boyer
josh boyer
8
2.48%
1
8.33%
sai praneeth
sai praneeth
1
0.31%
1
8.33%
Total
322
100.00%
12
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Directory: arch/x86/platform/efi

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