From 75def552bb1e0d39918df31b86f7d09e754ea0fc Mon Sep 17 00:00:00 2001 From: Bhupesh Sharma Date: Tue, 4 Apr 2017 17:02:40 +0100 Subject: 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 Signed-off-by: Ard Biesheuvel Cc: Linus Torvalds Cc: Matt Fleming Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20170404160245.27812-7-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar --- drivers/firmware/efi/Makefile | 1 + drivers/firmware/efi/efi-bgrt.c | 84 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+) create mode 100644 drivers/firmware/efi/efi-bgrt.c (limited to 'drivers/firmware') diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index ad67342313ed..0329d319d89a 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -9,6 +9,7 @@ # KASAN_SANITIZE_runtime-wrappers.o := n +obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o obj-$(CONFIG_EFI) += efi.o vars.o reboot.o memattr.o obj-$(CONFIG_EFI) += capsule.o memmap.o obj-$(CONFIG_EFI_VARS) += efivars.o diff --git a/drivers/firmware/efi/efi-bgrt.c b/drivers/firmware/efi/efi-bgrt.c new file mode 100644 index 000000000000..04ca8764f0c0 --- /dev/null +++ b/drivers/firmware/efi/efi-bgrt.c @@ -0,0 +1,84 @@ +/* + * Copyright 2012 Intel Corporation + * Author: Josh Triplett + * + * Based on the bgrt driver: + * Copyright 2012 Red Hat, Inc + * 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 +#include +#include +#include +#include + +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)); +} -- cgit