mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 17:16:42 +07:00
13f0e4d2b9
These items are only ever referenced from initialization code. Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: <mjg@redhat.com> Link: http://lkml.kernel.org/r/50AFB29F02000078000AAE8E@nat28.tlf.novell.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
80 lines
1.7 KiB
C
80 lines
1.7 KiB
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.
|
|
*/
|
|
#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))
|
|
return;
|
|
if (bgrt_tab->version != 1)
|
|
return;
|
|
if (bgrt_tab->image_type != 0 || !bgrt_tab->image_address)
|
|
return;
|
|
|
|
image = efi_lookup_mapped_addr(bgrt_tab->image_address);
|
|
if (!image) {
|
|
image = ioremap(bgrt_tab->image_address, sizeof(bmp_header));
|
|
ioremapped = true;
|
|
if (!image)
|
|
return;
|
|
}
|
|
|
|
memcpy_fromio(&bmp_header, image, sizeof(bmp_header));
|
|
if (ioremapped)
|
|
iounmap(image);
|
|
bgrt_image_size = bmp_header.size;
|
|
|
|
bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL);
|
|
if (!bgrt_image)
|
|
return;
|
|
|
|
if (ioremapped) {
|
|
image = ioremap(bgrt_tab->image_address, bmp_header.size);
|
|
if (!image) {
|
|
kfree(bgrt_image);
|
|
bgrt_image = NULL;
|
|
return;
|
|
}
|
|
}
|
|
|
|
memcpy_fromio(bgrt_image, image, bgrt_image_size);
|
|
if (ioremapped)
|
|
iounmap(image);
|
|
}
|