x86/efi/bgrt: Move efi-bgrt handling out of arch/x86

Now with open-source boot firmware (EDK2) supporting ACPI BGRT table
addition even for architectures like AARCH64, it makes sense to move
out the 'efi-bgrt.c' file and supporting infrastructure from 'arch/x86'
directory and house it inside 'drivers/firmware/efi', so that this common
code can be used across architectures.

Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
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/20170404160245.27812-7-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2 files changed, 0 insertions, 85 deletions

diff --git a/arch/x86/platform/efi/Makefile b/arch/x86/platform/efi/Makefile
index 066619b0700c..f1d83b34c329 100644
--- a/arch/x86/platform/efi/Makefile
+++ b/arch/x86/platform/efi/Makefile
@@ -1,6 +1,5 @@
 OBJECT_FILES_NON_STANDARD_efi_thunk_$(BITS).o := y
 
 obj-$(CONFIG_EFI) 		+= quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o
-obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o
 obj-$(CONFIG_EARLY_PRINTK_EFI)	+= early_printk.o
 obj-$(CONFIG_EFI_MIXED)		+= efi_thunk_$(BITS).o
diff --git a/arch/x86/platform/efi/efi-bgrt.c b/arch/x86/platform/efi/efi-bgrt.c
deleted file mode 100644
index 04ca8764f0c0..000000000000
--- a/arch/x86/platform/efi/efi-bgrt.c
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * 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
- *
- * 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.
- */
-
-#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 __initdata 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 (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;
-	if (bgrt->version != 1) {
-		pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
-		       bgrt->version);
-		goto out;
-	}
-	if (bgrt->status & 0xfe) {
-		pr_notice("Ignoring BGRT: reserved status bits are non-zero %u\n",
-		       bgrt->status);
-		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;
-	}
-
-	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));
-}