1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __UM_FIXMAP_H
 3#define __UM_FIXMAP_H
 4
 5#include <asm/processor.h>
 
 6#include <asm/archparam.h>
 7#include <asm/page.h>
 8#include <linux/threads.h>
 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 */
35enum fixed_addresses {
 
 
 
 
36	__end_of_fixed_addresses
37};
38
39extern void __set_fixmap (enum fixed_addresses idx,
40			  unsigned long phys, pgprot_t flags);
41
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 */
49
50#define FIXADDR_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
51#define FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
52#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)
53
54#include <asm-generic/fixmap.h>
55
56#endif

 
 1#ifndef __UM_FIXMAP_H
 2#define __UM_FIXMAP_H
 3
 4#include <asm/processor.h>
 5#include <asm/kmap_types.h>
 6#include <asm/archparam.h>
 7#include <asm/page.h>
 8#include <linux/threads.h>
 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 */
35enum fixed_addresses {
36#ifdef CONFIG_HIGHMEM
37	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
38	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
39#endif
40	__end_of_fixed_addresses
41};
42
43extern void __set_fixmap (enum fixed_addresses idx,
44			  unsigned long phys, pgprot_t flags);
45
46/*
47 * used by vmalloc.c.
48 *
49 * Leave one empty page between vmalloc'ed areas and
50 * the start of the fixmap, and leave one page empty
51 * at the top of mem..
52 */
53
54#define FIXADDR_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
55#define FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
56#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)
57
58#include <asm-generic/fixmap.h>
59
60#endif