mirror of
https://github.com/torvalds/linux.git
synced 2024-12-18 17:12:55 +00:00
9494a1e842
Signed-off-by: Mark Salter <msalter@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
70 lines
2.0 KiB
C
70 lines
2.0 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
|
|
*/
|
|
|
|
#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,
|
|
/* reserve the top 128K for early debugging purposes */
|
|
FIX_EARLY_DEBUG_TOP = FIX_HOLE,
|
|
FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1,
|
|
#ifdef CONFIG_HIGHMEM
|
|
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
|
|
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
|
|
#endif
|
|
/* FIX_PCIE_MCFG, */
|
|
__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_NCG
|
|
|
|
#include <asm-generic/fixmap.h>
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif
|