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diff --git a/i386/i386at/biosmem.h b/i386/i386at/biosmem.h
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+/*
+ * Copyright (c) 2010-2014 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _X86_BIOSMEM_H
+#define _X86_BIOSMEM_H
+
+#include <mach/machine/vm_types.h>
+#include <mach/machine/multiboot.h>
+
+/*
+ * Address where the address of the Extended BIOS Data Area segment can be
+ * found.
+ */
+#define BIOSMEM_EBDA_PTR 0x40e
+
+/*
+ * Significant low memory addresses.
+ *
+ * The first 64 KiB are reserved for various reasons (e.g. to preserve BIOS
+ * data and to work around data corruption on some hardware).
+ */
+#define BIOSMEM_BASE        0x010000
+#define BIOSMEM_BASE_END    0x0a0000
+#define BIOSMEM_EXT_ROM     0x0e0000
+#define BIOSMEM_ROM         0x0f0000
+#define BIOSMEM_END         0x100000
+
+/*
+ * Report reserved addresses to the biosmem module.
+ *
+ * Once all boot data have been registered, the user can set up the
+ * early page allocator.
+ *
+ * If the range is marked temporary, it will be unregistered when
+ * biosmem_free_usable() is called, so that pages that used to store
+ * these boot data may be released to the VM system.
+ */
+void biosmem_register_boot_data(phys_addr_t start, phys_addr_t end,
+                                boolean_t temporary);
+
+/*
+ * Initialize the early page allocator.
+ *
+ * This function uses the memory map provided by the boot loader along
+ * with the registered boot data addresses to set up a heap of free pages
+ * of physical memory.
+ *
+ * Note that on Xen, this function registers all the Xen boot information
+ * as boot data itself.
+ */
+#ifdef MACH_HYP
+void biosmem_xen_bootstrap(void);
+#else /* MACH_HYP */
+void biosmem_bootstrap(const struct multiboot_raw_info *mbi);
+#endif /* MACH_HYP */
+
+/*
+ * Allocate contiguous physical pages during bootstrap.
+ *
+ * The pages returned are guaranteed to be part of the direct physical
+ * mapping when paging is enabled.
+ *
+ * This function should only be used to allocate initial page table pages.
+ * Those pages are later loaded into the VM system (as reserved pages)
+ * which means they can be freed like other regular pages. Users should
+ * fix up the type of those pages once the VM system is initialized.
+ */
+unsigned long biosmem_bootalloc(unsigned int nr_pages);
+
+/*
+ * Return the limit of physical memory that can be directly mapped.
+ */
+phys_addr_t biosmem_directmap_end(void);
+
+/*
+ * Set up physical memory based on the information obtained during bootstrap
+ * and load it in the VM system.
+ */
+void biosmem_setup(void);
+
+/*
+ * Free all usable memory.
+ *
+ * This function releases all pages that aren't used by boot data and have
+ * not already been loaded into the VM system.
+ */
+void biosmem_free_usable(void);
+
+/*
+ * Tell whether this address is marked as available in the biosmem and thus used
+ * for usable memory.
+ */
+boolean_t biosmem_addr_available(phys_addr_t addr);
+
+#endif /* _X86_BIOSMEM_H */