106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
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/*
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* Copyright 2012 Intel Corporation
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* Author: Josh Triplett <josh@joshtriplett.org>
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*
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* Based on the bgrt driver:
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* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
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* Author: Matthew Garrett
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/efi.h>
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#include <linux/efi-bgrt.h>
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struct acpi_table_bgrt *bgrt_tab;
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void *__initdata bgrt_image;
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size_t __initdata bgrt_image_size;
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struct bmp_header {
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u16 id;
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u32 size;
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} __packed;
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void __init efi_bgrt_init(void)
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{
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acpi_status status;
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void __iomem *image;
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bool ioremapped = false;
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struct bmp_header bmp_header;
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if (acpi_disabled)
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return;
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status = acpi_get_table("BGRT", 0,
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(struct acpi_table_header **)&bgrt_tab);
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if (ACPI_FAILURE(status))
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return;
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if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
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pr_err("Ignoring BGRT: invalid length %u (expected %zu)\n",
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bgrt_tab->header.length, sizeof(*bgrt_tab));
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return;
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}
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if (bgrt_tab->version != 1) {
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pr_err("Ignoring BGRT: invalid version %u (expected 1)\n",
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bgrt_tab->version);
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return;
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}
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if (bgrt_tab->status != 1) {
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pr_err("Ignoring BGRT: invalid status %u (expected 1)\n",
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bgrt_tab->status);
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return;
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}
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if (bgrt_tab->image_type != 0) {
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pr_err("Ignoring BGRT: invalid image type %u (expected 0)\n",
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bgrt_tab->image_type);
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return;
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}
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if (!bgrt_tab->image_address) {
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pr_err("Ignoring BGRT: null image address\n");
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return;
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}
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image = efi_lookup_mapped_addr(bgrt_tab->image_address);
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if (!image) {
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image = early_memremap(bgrt_tab->image_address,
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sizeof(bmp_header));
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ioremapped = true;
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if (!image) {
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pr_err("Ignoring BGRT: failed to map image header memory\n");
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return;
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}
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}
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memcpy_fromio(&bmp_header, image, sizeof(bmp_header));
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if (ioremapped)
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early_iounmap(image, sizeof(bmp_header));
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bgrt_image_size = bmp_header.size;
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bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
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if (!bgrt_image) {
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pr_err("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
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bgrt_image_size);
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return;
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}
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if (ioremapped) {
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image = early_memremap(bgrt_tab->image_address,
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bmp_header.size);
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if (!image) {
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pr_err("Ignoring BGRT: failed to map image memory\n");
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kfree(bgrt_image);
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bgrt_image = NULL;
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return;
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}
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}
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memcpy_fromio(bgrt_image, image, bgrt_image_size);
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if (ioremapped)
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early_iounmap(image, bmp_header.size);
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}
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