70 lines
2 KiB
C
70 lines
2 KiB
C
|
/*
|
||
|
|
* fixmap.h: compile-time virtual memory allocation
|
||
|
|
*
|
||
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
||
|
|
* License. See the file "COPYING" in the main directory of this archive
|
||
|
|
* for more details.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1998 Ingo Molnar
|
||
|
|
*
|
||
|
|
* Copyright 2008 Freescale Semiconductor Inc.
|
||
|
|
* Port to powerpc added by Kumar Gala
|
||
|
|
*
|
||
|
|
* Copyright 2011 Michal Simek <monstr@monstr.eu>
|
||
|
|
* 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>
|
||
|
|
#ifdef CONFIG_HIGHMEM
|
||
|
|
#include <linux/threads.h>
|
||
|
|
#include <asm/kmap_types.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#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_HOLE,
|
||
|
|
#ifdef CONFIG_HIGHMEM
|
||
|
|
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
|
||
|
|
FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * num_possible_cpus()) - 1,
|
||
|
|
#endif
|
||
|
|
__end_of_fixed_addresses
|
||
|
|
};
|
||
|
|
|
||
|
|
extern void __set_fixmap(enum fixed_addresses idx,
|
||
|
|
phys_addr_t phys, pgprot_t flags);
|
||
|
|
|
||
|
|
#define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
|
||
|
|
#define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
|
||
|
|
|
||
|
|
#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_CI
|
||
|
|
|
||
|
|
#include <asm-generic/fixmap.h>
|
||
|
|
|
||
|
|
#endif /* !__ASSEMBLY__ */
|
||
|
|
#endif
|