1 /* SPDX-License-Identifier: GPL-2.0 */ 1
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 'specia
12 * addresses. The point is to have a constant
13 * compile time, but to set the physical addre
14 * in the boot process. We allocate these spec
15 * from the end of virtual memory (0xfffff000)
16 * Also this lets us do fail-safe vmalloc(), w
17 * can guarantee that these special addresses
18 * vmalloc()-ed addresses never overlap.
19 *
20 * these 'compile-time allocated' memory buffe
21 * fixed-size 4k pages. (or larger if used wit
22 * highger than 1) use fixmap_set(idx,phys) to
23 * physical memory with fixmap indices.
24 *
25 * TLB entries of such buffers will not be flu
26 * task switches.
27 */
28
29 /*
30 * on UP currently we will have no trace of th
31 * no page table allocations, etc. This might
32 * future, say framebuffers for the console dr
33 * fix-mapped?
34 */
35 enum fixed_addresses {
36 __end_of_fixed_addresses
37 };
38
39 extern void __set_fixmap (enum fixed_addresses
40 unsigned long phys,
41
42 /*
43 * used by vmalloc.c.
44 *
45 * Leave one empty page between vmalloc'ed are
46 * the start of the fixmap, and leave one page
47 * at the top of mem..
48 */
49
50 #define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_
51 #define FIXADDR_SIZE (__end_of_fixed_addres
52 #define FIXADDR_START (FIXADDR_TOP - FIXADDR
53
54 #include <asm-generic/fixmap.h>
55
56 #endif
57
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.