a6ce7114ee
Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Richard Weinberger <richard@nod.at> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
#ifndef __UM_FIXMAP_H
|
|
#define __UM_FIXMAP_H
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/kmap_types.h>
|
|
#include <asm/archparam.h>
|
|
#include <asm/page.h>
|
|
#include <linux/threads.h>
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* on UP currently we will have no trace of the fixmap mechanizm,
|
|
* no page table allocations, etc. This might change in the
|
|
* future, say framebuffers for the console driver(s) could be
|
|
* fix-mapped?
|
|
*/
|
|
enum fixed_addresses {
|
|
#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
|
|
__end_of_fixed_addresses
|
|
};
|
|
|
|
extern void __set_fixmap (enum fixed_addresses idx,
|
|
unsigned long phys, pgprot_t flags);
|
|
|
|
/*
|
|
* used by vmalloc.c.
|
|
*
|
|
* Leave one empty page between vmalloc'ed areas and
|
|
* the start of the fixmap, and leave one page empty
|
|
* at the top of mem..
|
|
*/
|
|
|
|
#define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_SIZE)
|
|
#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
|
|
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
|
|
|
|
#include <asm-generic/fixmap.h>
|
|
|
|
#endif
|