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2223af3890
The ACPI BGRT driver accesses the BIOS logo image when it initializes. However, ACPI 5.0 (which introduces the BGRT) recommends putting the logo image in EFI boot services memory, so that the OS can reclaim that memory. Production systems follow this recommendation, breaking the ACPI BGRT driver. Move the bulk of the BGRT code to run during a new EFI late initialization phase, which occurs after switching EFI to virtual mode, and after initializing ACPI, but before freeing boot services memory. Copy the BIOS logo image to kernel memory at that point, and make it accessible to the BGRT driver. Rework the existing ACPI BGRT driver to act as a simple wrapper exposing that image (and the properties from the BGRT) via sysfs. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Link: http://lkml.kernel.org/r/93ce9f823f1c1f3bb88bdd662cce08eee7a17f5d.1348876882.git.josh@joshtriplett.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
22 lines
427 B
C
22 lines
427 B
C
#ifndef _LINUX_EFI_BGRT_H
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#define _LINUX_EFI_BGRT_H
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#ifdef CONFIG_ACPI_BGRT
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#include <linux/acpi.h>
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void efi_bgrt_init(void);
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/* The BGRT data itself; only valid if bgrt_image != NULL. */
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extern void *bgrt_image;
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extern size_t bgrt_image_size;
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extern struct acpi_table_bgrt *bgrt_tab;
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#else /* !CONFIG_ACPI_BGRT */
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static inline void efi_bgrt_init(void) {}
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#endif /* !CONFIG_ACPI_BGRT */
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#endif /* _LINUX_EFI_BGRT_H */
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