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/* SPDX-License-Identifier: GPL-2.0 */
* fixmap.h: compile-time virtual memory allocation
* Copyright (C) 1998 Ingo Molnar
* Copyright 2008 Freescale Semiconductor Inc.
* Port to powerpc added by Kumar Gala
* Copyright 2011 Michal Simek <>
* Copyright 2011 PetaLogix Qld Pty Ltd
* Port to Microblaze
#ifndef _ASM_FIXMAP_H
#define _ASM_FIXMAP_H
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
#include <asm/page.h>
#include <linux/threads.h>
#include <asm/kmap_size.h>
#define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE))
* Here we define all the compile-time 'special' virtual
* addresses. The point is to have a constant address at
* compile time, but to set the physical address only
* in the boot process. We allocate these special addresses
* from the end of virtual memory (0xfffff000) backwards.
* Also this lets us do fail-safe vmalloc(), we
* can guarantee that these special addresses and
* vmalloc()-ed addresses never overlap.
* these 'compile-time allocated' memory buffers are
* fixed-size 4k pages. (or larger if used with an increment
* highger than 1) use fixmap_set(idx,phys) to associate
* physical memory with fixmap indices.
* TLB entries of such buffers will not be flushed across
* task switches.
enum fixed_addresses {
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * num_possible_cpus()) - 1,
extern void __set_fixmap(enum fixed_addresses idx,
phys_addr_t phys, pgprot_t flags);
#define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
#include <asm-generic/fixmap.h>
#endif /* !__ASSEMBLY__ */