Contributors: 13
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Josh Triplett |
133 |
42.90% |
2 |
10.00% |
| Dave Young |
87 |
28.06% |
3 |
15.00% |
| Matthew Garrett |
27 |
8.71% |
1 |
5.00% |
| Môshe van der Sterre |
18 |
5.81% |
1 |
5.00% |
| Jan Beulich |
18 |
5.81% |
3 |
15.00% |
| Matt Fleming |
8 |
2.58% |
2 |
10.00% |
| Josh Boyer |
6 |
1.94% |
1 |
5.00% |
| Linus Torvalds (pre-git) |
3 |
0.97% |
2 |
10.00% |
| Huang Ying |
3 |
0.97% |
1 |
5.00% |
| Paul Gortmaker |
2 |
0.65% |
1 |
5.00% |
| Hans de Goede |
2 |
0.65% |
1 |
5.00% |
| Ard Biesheuvel |
2 |
0.65% |
1 |
5.00% |
| Sai Praneeth |
1 |
0.32% |
1 |
5.00% |
| Total |
310 |
|
20 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* 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
*/
#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;
size_t bgrt_image_size;
struct bmp_header {
u16 id;
u32 size;
} __packed;
void __init efi_bgrt_init(struct acpi_table_header *table)
{
void *image;
struct bmp_header bmp_header;
struct acpi_table_bgrt *bgrt = &bgrt_tab;
if (acpi_disabled)
return;
if (!efi_enabled(EFI_MEMMAP))
return;
if (table->length < sizeof(bgrt_tab)) {
pr_notice("Ignoring BGRT: invalid length %u (expected %zu)\n",
table->length, sizeof(bgrt_tab));
return;
}
*bgrt = *(struct acpi_table_bgrt *)table;
/*
* Only version 1 is defined but some older laptops (seen on Lenovo
* Ivy Bridge models) have a correct version 1 BGRT table with the
* version set to 0, so we accept version 0 and 1.
*/
if (bgrt->version > 1) {
pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
bgrt->version);
goto out;
}
if (bgrt->image_type != 0) {
pr_notice("Ignoring BGRT: invalid image type %u (expected 0)\n",
bgrt->image_type);
goto out;
}
if (!bgrt->image_address) {
pr_notice("Ignoring BGRT: null image address\n");
goto out;
}
if (efi_mem_type(bgrt->image_address) != EFI_BOOT_SERVICES_DATA) {
pr_notice("Ignoring BGRT: invalid image address\n");
goto out;
}
image = early_memremap(bgrt->image_address, sizeof(bmp_header));
if (!image) {
pr_notice("Ignoring BGRT: failed to map image header memory\n");
goto out;
}
memcpy(&bmp_header, image, sizeof(bmp_header));
early_memunmap(image, sizeof(bmp_header));
if (bmp_header.id != 0x4d42) {
pr_notice("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
bmp_header.id);
goto out;
}
bgrt_image_size = bmp_header.size;
efi_mem_reserve(bgrt->image_address, bgrt_image_size);
return;
out:
memset(bgrt, 0, sizeof(bgrt_tab));
}