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