Matthew, The signature for BGRT, and the definition of the table itself appear in the new ACPICA file "actbl3.h". Bob > -----Original Message----- > From: linux-acpi-owner@xxxxxxxxxxxxxxx [mailto:linux-acpi- > owner@xxxxxxxxxxxxxxx] On Behalf Of Matthew Garrett > Sent: Tuesday, January 31, 2012 8:40 AM > To: linux-acpi@xxxxxxxxxxxxxxx > Cc: lenb@xxxxxxxxxx; Matthew Garrett > Subject: [PATCH 2/2] ACPI: Add support for exposing BGRT data > > ACPI 5.0 adds the BGRT, a table that contains a pointer to the firmware > boot splash and associated metadata. This simple driver exposes it via > /sys/firmware/acpi in order to allow bootsplash applications to draw > their > splash around the firmware image and reduce the number of jarring > graphical > transitions during boot. > > Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx> > --- > Documentation/ABI/testing/sysfs-firmware-acpi | 20 +++ > drivers/acpi/Kconfig | 9 ++ > drivers/acpi/Makefile | 1 + > drivers/acpi/bgrt.c | 175 > +++++++++++++++++++++++++ > include/acpi/actbl1.h | 18 +++ > 5 files changed, 223 insertions(+), 0 deletions(-) > create mode 100644 drivers/acpi/bgrt.c > > diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi > b/Documentation/ABI/testing/sysfs-firmware-acpi > index 4f9ba3c..dd930c8 100644 > --- a/Documentation/ABI/testing/sysfs-firmware-acpi > +++ b/Documentation/ABI/testing/sysfs-firmware-acpi > @@ -1,3 +1,23 @@ > +What: /sys/firmware/acpi/bgrt/ > +Date: January 2012 > +Contact: Matthew Garrett <mjg@xxxxxxxxxx> > +Description: > + The BGRT is an ACPI 5.0 feature that allows the OS > + to obtain a copy of the firmware boot splash and > + some associated metadata. This is intended to be used > + by boot splash applications in order to interact with > + the firmware boot splash in order to avoid jarring > + transitions. > + > + image: The image bitmap. Currently a 32-bit BMP. > + status: 1 if the image is valid, 0 if firmware invalidated > it. > + type: 0 indicates image is in BMP format. > + version: The version of the BGRT. Currently 1. > + xoffset: The number of pixels between the left of the > screen > + and the left edge of the image. > + yoffset: The number of pixels between the top of the screen > + and the top edge of the image. > + > What: /sys/firmware/acpi/interrupts/ > Date: February 2008 > Contact: Len Brown <lenb@xxxxxxxxxx> > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > index de0e3df..4eefcb2 100644 > --- a/drivers/acpi/Kconfig > +++ b/drivers/acpi/Kconfig > @@ -384,6 +384,15 @@ config ACPI_CUSTOM_METHOD > load additional kernel modules after boot, this feature may be > used > to override that restriction). > > +config ACPI_BGRT > + tristate "Boottime Graphics Resource Table support" > + default n > + help > + This driver adds support for exposing the ACPI Boottime > Graphics > + Resource Table, which allows the operating system to obtain > + data from the firmware boot splash. It will appear under > + /sys/firmware/acpi/bgrt/ . > + > source "drivers/acpi/apei/Kconfig" > > endif # ACPI > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index ecb26b4..3409208 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -62,6 +62,7 @@ obj-$(CONFIG_ACPI_SBS) += sbs.o > obj-$(CONFIG_ACPI_HED) += hed.o > obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o > obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o > +obj-$(CONFIG_ACPI_BGRT) += bgrt.o > > # processor has its own "processor." module_param namespace > processor-y := processor_driver.o > processor_throttling.o > diff --git a/drivers/acpi/bgrt.c b/drivers/acpi/bgrt.c > new file mode 100644 > index 0000000..15dff29 > --- /dev/null > +++ b/drivers/acpi/bgrt.c > @@ -0,0 +1,175 @@ > +/* > + * Copyright 2012 Red Hat, Inc <mjg@xxxxxxxxxx> > + * > + * 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/module.h> > +#include <linux/init.h> > +#include <linux/device.h> > +#include <linux/sysfs.h> > +#include <acpi/acpi.h> > +#include <acpi/acpi_bus.h> > + > +static struct acpi_table_bgrt *bgrt_tab; > +static struct kobject *bgrt_kobj; > + > +struct bmp_header { > + u16 id; > + u32 size; > +} __attribute ((packed)); > + > +static struct bmp_header bmp_header; > + > +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->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->xoffset); > +} > +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->yoffset); > +} > +static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); > + > +static ssize_t show_image(struct file *file, struct kobject *kobj, > + struct bin_attribute *attr, char *buf, loff_t off, size_t > count) > +{ > + int size = attr->size; > + void __iomem *image = attr->private; > + > + if (off >= size) { > + count = 0; > + } else { > + if (off + count > size) > + count = size - off; > + > + memcpy_fromio(buf, image+off, count); > + } > + > + return count; > +} > + > +static struct bin_attribute image_attr = { > + .attr = { > + .name = "image", > + .mode = S_IRUGO, > + }, > + .read = show_image, > +}; > + > +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 attribute_group bgrt_attribute_group = { > + .attrs = bgrt_attributes, > +}; > + > +static int __init bgrt_init(void) > +{ > + acpi_status status; > + int ret; > + void __iomem *bgrt; > + > + if (acpi_disabled) > + return -ENODEV; > + > + status = acpi_get_table("BGRT", 0, > + (struct acpi_table_header **)&bgrt_tab); > + > + if (ACPI_FAILURE(status)) > + return -ENODEV; > + > + sysfs_bin_attr_init(&image_attr); > + > + bgrt = ioremap(bgrt_tab->address, sizeof(struct bmp_header)); > + > + if (!bgrt) { > + ret = -EINVAL; > + goto out_err; > + } > + > + memcpy_fromio(&bmp_header, bgrt, sizeof(bmp_header)); > + image_attr.size = bmp_header.size; > + iounmap(bgrt); > + > + image_attr.private = ioremap(bgrt_tab->address, image_attr.size); > + > + if (!image_attr.private) { > + ret = -EINVAL; > + goto out_err; > + } > + > + > + bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); > + if (!bgrt_kobj) { > + ret = -EINVAL; > + goto out_iounmap; > + } > + > + ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); > + if (ret) > + goto out_kobject; > + > + ret = sysfs_create_bin_file(bgrt_kobj, &image_attr); > + if (ret) > + goto out_group; > + > + return 0; > + > +out_group: > + sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); > +out_kobject: > + kobject_put(bgrt_kobj); > +out_iounmap: > + iounmap(image_attr.private); > +out_err: > + return ret; > +} > + > +static void __exit bgrt_exit(void) > +{ > + iounmap(image_attr.private); > + sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); > + sysfs_remove_bin_file(bgrt_kobj, &image_attr); > +} > + > +module_init(bgrt_init); > +module_exit(bgrt_exit); > + > +MODULE_AUTHOR("Matthew Garrett"); > +MODULE_DESCRIPTION("BGRT boot graphic support"); > +MODULE_LICENSE("GPL"); > diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h > index 7504bc9..1b22528 100644 > --- a/include/acpi/actbl1.h > +++ b/include/acpi/actbl1.h > @@ -61,6 +61,7 @@ > * the wrong signature. > */ > #define ACPI_SIG_BERT "BERT" /* Boot Error Record Table */ > +#define ACPI_SIG_BGRT "BGRT" /* Boot Graphics Resource > Table */ > #define ACPI_SIG_CPEP "CPEP" /* Corrected Platform Error > Polling table */ > #define ACPI_SIG_ECDT "ECDT" /* Embedded Controller Boot > Resources Table */ > #define ACPI_SIG_EINJ "EINJ" /* Error Injection table */ > @@ -157,6 +158,23 @@ enum acpi_bert_error_severity { > > > /********************************************************************** > ********* > * > + * BGRT - Boot Graphics Resource Table > + * Version 1 > + * > + > *********************************************************************** > *******/ > + > +struct acpi_table_bgrt { > + struct acpi_table_header header; /* Common ACPI table header > */ > + u16 version; > + u8 status; > + u8 type; > + u64 address; > + u32 xoffset; > + u32 yoffset; > +}; > + > +/********************************************************************* > ********** > + * > * CPEP - Corrected Platform Error Polling table (ACPI 4.0) > * Version 1 > * > -- > 1.7.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" > in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
