blob: c0fcd1bbdba98078dbe28982bb6ca7e6a5a02ba2 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Kumar Gala33d71d22007-08-20 08:50:28 -05002/*
3 * highmem.h: virtual kernel memory mappings for high memory
4 *
5 * PowerPC version, stolen from the i386 version.
6 *
7 * Used in CONFIG_HIGHMEM systems for memory pages which
8 * are not addressable by direct kernel virtual addresses.
9 *
10 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
11 * Gerhard.Wichert@pdb.siemens.de
12 *
13 *
14 * Redesigned the x86 32-bit VM architecture to deal with
15 * up to 16 Terrabyte physical memory. With current x86 CPUs
16 * we now support up to 64 Gigabytes physical RAM.
17 *
18 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
19 */
20
21#ifndef _ASM_HIGHMEM_H
22#define _ASM_HIGHMEM_H
23
24#ifdef __KERNEL__
25
Kumar Gala33d71d22007-08-20 08:50:28 -050026#include <linux/interrupt.h>
Christophe Leroy45ef5992018-07-05 16:25:19 +000027#include <asm/cacheflush.h>
Kumar Gala33d71d22007-08-20 08:50:28 -050028#include <asm/page.h>
Kumar Gala2c419bd2008-04-23 23:05:20 +100029#include <asm/fixmap.h>
Kumar Gala33d71d22007-08-20 08:50:28 -050030
Kumar Gala33d71d22007-08-20 08:50:28 -050031extern pte_t *pkmap_page_table;
32
33/*
34 * Right now we initialize only a single pte table. It can be extended
35 * easily, subsequent pte tables have to be allocated in one physical
36 * chunk of RAM.
37 */
Ilya Yanokca9153a2008-12-11 04:55:41 +030038/*
Yuri Tikhonove1240122009-01-29 01:40:44 +000039 * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte
40 * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP
41 * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP
42 * in case of 16K/64K/256K page sizes.
Ilya Yanokca9153a2008-12-11 04:55:41 +030043 */
44#ifdef CONFIG_PPC_4K_PAGES
45#define PKMAP_ORDER PTE_SHIFT
46#else
Yuri Tikhonove1240122009-01-29 01:40:44 +000047#define PKMAP_ORDER 9
Ilya Yanokca9153a2008-12-11 04:55:41 +030048#endif
49#define LAST_PKMAP (1 << PKMAP_ORDER)
50#ifndef CONFIG_PPC_4K_PAGES
51#define PKMAP_BASE (FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1))
52#else
Kumar Gala2c419bd2008-04-23 23:05:20 +100053#define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK)
Ilya Yanokca9153a2008-12-11 04:55:41 +030054#endif
55#define LAST_PKMAP_MASK (LAST_PKMAP-1)
Kumar Gala33d71d22007-08-20 08:50:28 -050056#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
57#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
58
Kumar Gala33d71d22007-08-20 08:50:28 -050059#define flush_cache_kmaps() flush_cache_all()
60
Thomas Gleixner78502582021-01-23 21:02:11 -080061#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev) \
62 __set_pte_at(mm, vaddr, ptep, ptev, 1)
Thomas Gleixner47da42b2020-11-03 10:27:27 +010063#define arch_kmap_local_post_map(vaddr, pteval) \
64 local_flush_tlb_page(NULL, vaddr)
65#define arch_kmap_local_post_unmap(vaddr) \
66 local_flush_tlb_page(NULL, vaddr)
67
Kumar Gala33d71d22007-08-20 08:50:28 -050068#endif /* __KERNEL__ */
69
70#endif /* _ASM_HIGHMEM_H */