mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 02:30:52 +07:00
6e7300cff1
Now that the ACPI BGRT handling code has been made generic, we can enable it for arm64. Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com> [ Updated commit log to reflect that BGRT is only enabled for arm64, and added missing 'return' statement to the dummy acpi_parse_bgrt() function. ] Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20170404160245.27812-8-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/*
|
|
* BGRT boot graphic support
|
|
* Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
|
|
* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
|
|
* Copyright 2012 Intel Corporation
|
|
*
|
|
* 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/device.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/efi-bgrt.h>
|
|
|
|
static void *bgrt_image;
|
|
static struct kobject *bgrt_kobj;
|
|
|
|
static ssize_t show_version(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
|
|
}
|
|
static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
|
|
|
|
static ssize_t show_status(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
|
|
}
|
|
static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
|
|
|
|
static ssize_t show_type(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
|
|
}
|
|
static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
|
|
|
|
static ssize_t show_xoffset(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
|
|
}
|
|
static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
|
|
|
|
static ssize_t show_yoffset(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
|
|
}
|
|
static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
|
|
|
|
static ssize_t image_read(struct file *file, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf, loff_t off, size_t count)
|
|
{
|
|
memcpy(buf, attr->private + off, count);
|
|
return count;
|
|
}
|
|
|
|
static BIN_ATTR_RO(image, 0); /* size gets filled in later */
|
|
|
|
static struct attribute *bgrt_attributes[] = {
|
|
&dev_attr_version.attr,
|
|
&dev_attr_status.attr,
|
|
&dev_attr_type.attr,
|
|
&dev_attr_xoffset.attr,
|
|
&dev_attr_yoffset.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct bin_attribute *bgrt_bin_attributes[] = {
|
|
&bin_attr_image,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group bgrt_attribute_group = {
|
|
.attrs = bgrt_attributes,
|
|
.bin_attrs = bgrt_bin_attributes,
|
|
};
|
|
|
|
int __init acpi_parse_bgrt(struct acpi_table_header *table)
|
|
{
|
|
efi_bgrt_init(table);
|
|
return 0;
|
|
}
|
|
|
|
static int __init bgrt_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!bgrt_tab.image_address)
|
|
return -ENODEV;
|
|
|
|
bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
|
|
MEMREMAP_WB);
|
|
if (!bgrt_image) {
|
|
pr_notice("Ignoring BGRT: failed to map image memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bin_attr_image.private = bgrt_image;
|
|
bin_attr_image.size = bgrt_image_size;
|
|
|
|
bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
|
|
if (!bgrt_kobj) {
|
|
ret = -EINVAL;
|
|
goto out_memmap;
|
|
}
|
|
|
|
ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
|
|
if (ret)
|
|
goto out_kobject;
|
|
|
|
return 0;
|
|
|
|
out_kobject:
|
|
kobject_put(bgrt_kobj);
|
|
out_memmap:
|
|
memunmap(bgrt_image);
|
|
return ret;
|
|
}
|
|
device_initcall(bgrt_init);
|