mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Mark Salter](/assets/img/avatar_default.png)
Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
69 lines
1.9 KiB
C
69 lines
1.9 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
|
|
*
|
|
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
|
|
*/
|
|
|
|
#ifndef _ASM_FIXMAP_H
|
|
#define _ASM_FIXMAP_H
|
|
|
|
#include <asm/pgtable.h>
|
|
#ifdef CONFIG_HIGHMEM
|
|
#include <linux/threads.h>
|
|
#include <asm/kmap_types.h>
|
|
#endif
|
|
|
|
/*
|
|
* 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 the consistent memory region 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
|
|
* higher 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 {
|
|
#define FIX_N_COLOURS 8
|
|
#ifdef CONFIG_HIGHMEM
|
|
/* reserved pte's for temporary kernel mappings */
|
|
FIX_KMAP_BEGIN,
|
|
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
|
|
#endif
|
|
__end_of_fixed_addresses
|
|
};
|
|
|
|
#define FIXADDR_TOP (CONSISTENT_START - PAGE_SIZE)
|
|
#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
|
|
#define FIXADDR_START ((FIXADDR_TOP - FIXADDR_SIZE) & PMD_MASK)
|
|
|
|
#include <asm-generic/fixmap.h>
|
|
|
|
#define kmap_get_fixmap_pte(vaddr) \
|
|
pte_offset_kernel( \
|
|
pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), \
|
|
(vaddr) \
|
|
)
|
|
|
|
/*
|
|
* Called from pgtable_init()
|
|
*/
|
|
extern void fixrange_init(unsigned long start, unsigned long end,
|
|
pgd_t *pgd_base);
|
|
|
|
|
|
#endif
|