[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / arch / um / include / asm / fixmap.h

#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 {
	__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
Commit	Line	Data
1da177e4 LT	1	#ifndef __UM_FIXMAP_H
	2	#define __UM_FIXMAP_H
	3
536788fe	4	#include <asm/processor.h>
1da177e4 LT	5	#include <asm/kmap_types.h>
1da177e4 LT	6	#include <asm/archparam.h>
8192ab42	7	#include <asm/page.h>
fe1cd987	8	#include <linux/threads.h>
1da177e4 LT	9
	10	/*
	11	* Here we define all the compile-time 'special' virtual
	12	* addresses. The point is to have a constant address at
	13	* compile time, but to set the physical address only
	14	* in the boot process. We allocate these special addresses
	15	* from the end of virtual memory (0xfffff000) backwards.
	16	* Also this lets us do fail-safe vmalloc(), we
	17	* can guarantee that these special addresses and
	18	* vmalloc()-ed addresses never overlap.
	19	*
	20	* these 'compile-time allocated' memory buffers are
	21	* fixed-size 4k pages. (or larger if used with an increment
	22	* highger than 1) use fixmap_set(idx,phys) to associate
	23	* physical memory with fixmap indices.
	24	*
	25	* TLB entries of such buffers will not be flushed across
	26	* task switches.
	27	*/
	28
	29	/*
	30	* on UP currently we will have no trace of the fixmap mechanizm,
	31	* no page table allocations, etc. This might change in the
	32	* future, say framebuffers for the console driver(s) could be
	33	* fix-mapped?
	34	*/
	35	enum fixed_addresses {
1da177e4 LT	36	__end_of_fixed_addresses
	37	};
	38
	39	extern void __set_fixmap (enum fixed_addresses idx,
	40	unsigned long phys, pgprot_t flags);
	41
1da177e4 LT	42	/*
	43	* used by vmalloc.c.
	44	*
	45	* Leave one empty page between vmalloc'ed areas and
	46	* the start of the fixmap, and leave one page empty
	47	* at the top of mem..
	48	*/
1da177e4	49
536788fe	50	#define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_SIZE)
1da177e4 LT	51	#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
	52	#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
	53
a6ce7114	54	#include <asm-generic/fixmap.h>
1da177e4 LT	55
1da177e4 LT	56	#endif