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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* highmem.h: virtual kernel memory mappings for high memory
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * - Derived from include/asm-i386/highmem.h
6 *
Adrian Bunk0868ff72008-02-03 15:54:28 +02007 * See Documentation/frv/mmu-layout.txt for more information.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15#ifndef _ASM_HIGHMEM_H
16#define _ASM_HIGHMEM_H
17
18#ifdef __KERNEL__
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/init.h>
Akinobu Mita7ca43e72009-03-31 15:23:25 -070021#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <asm/mem-layout.h>
23#include <asm/spr-regs.h>
24#include <asm/mb-regs.h>
25
26#define NR_TLB_LINES 64 /* number of lines in the TLB */
27
28#ifndef __ASSEMBLY__
29
30#include <linux/interrupt.h>
31#include <asm/kmap_types.h>
32#include <asm/pgtable.h>
33
34#ifdef CONFIG_DEBUG_HIGHMEM
35#define HIGHMEM_DEBUG 1
36#else
37#define HIGHMEM_DEBUG 0
38#endif
39
40/* declarations for highmem.c */
41extern unsigned long highstart_pfn, highend_pfn;
42
43#define kmap_prot PAGE_KERNEL
44#define kmap_pte ______kmap_pte_in_TLB
45extern pte_t *pkmap_page_table;
46
47#define flush_cache_kmaps() do { } while (0)
48
49/*
50 * Right now we initialize only a single pte table. It can be extended
51 * easily, subsequent pte tables have to be allocated in one physical
52 * chunk of RAM.
53 */
54#define LAST_PKMAP PTRS_PER_PTE
55#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
56#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
57#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
58
59extern void *kmap_high(struct page *page);
60extern void kunmap_high(struct page *page);
61
62extern void *kmap(struct page *page);
63extern void kunmap(struct page *page);
64
65extern struct page *kmap_atomic_to_page(void *ptr);
66
67#endif /* !__ASSEMBLY__ */
68
69/*
70 * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
71 * gives a more generic (and caching) interface. But kmap_atomic can
72 * be used in IRQ contexts, so in some (very limited) cases we need
73 * it.
74 */
75#define KMAP_ATOMIC_CACHE_DAMR 8
76
77#ifndef __ASSEMBLY__
78
Cong Wang144cf862012-06-27 13:02:49 +080079#define __kmap_atomic_primary(cached, paddr, ampr) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070080({ \
81 unsigned long damlr, dampr; \
82 \
83 dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
84 \
Cong Wang144cf862012-06-27 13:02:49 +080085 if (!cached) \
David Howells29da7eb2006-10-16 14:10:49 +010086 asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory"); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 else \
Cong Wang144cf862012-06-27 13:02:49 +080088 /* cache flush page attachment point */ \
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 asm volatile("movgs %0,iampr"#ampr"\n" \
90 "movgs %0,dampr"#ampr"\n" \
David Howells29da7eb2006-10-16 14:10:49 +010091 :: "r"(dampr) : "memory" \
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 ); \
93 \
94 asm("movsg damlr"#ampr",%0" : "=r"(damlr)); \
95 \
96 /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/ \
97 \
98 (void *) damlr; \
99})
100
101#define __kmap_atomic_secondary(slot, paddr) \
102({ \
103 unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE; \
104 unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
105 \
106 asm volatile("movgs %0,tplr \n" \
107 "movgs %1,tppr \n" \
108 "tlbpr %0,gr0,#2,#1" \
David Howells29da7eb2006-10-16 14:10:49 +0100109 : : "r"(damlr), "r"(dampr) : "memory"); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 \
111 /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \
112 \
113 (void *) damlr; \
114})
115
Cong Wang144cf862012-06-27 13:02:49 +0800116static inline void *kmap_atomic_primary(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
118 unsigned long paddr;
119
Peter Zijlstraa8663742006-12-06 20:32:20 -0800120 pagefault_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 paddr = page_to_phys(page);
122
Cong Wang144cf862012-06-27 13:02:49 +0800123 return __kmap_atomic_primary(1, paddr, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124}
125
Cong Wang144cf862012-06-27 13:02:49 +0800126#define __kunmap_atomic_primary(cached, ampr) \
David Howells29da7eb2006-10-16 14:10:49 +0100127do { \
128 asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory"); \
Cong Wang144cf862012-06-27 13:02:49 +0800129 if (cached) \
David Howells29da7eb2006-10-16 14:10:49 +0100130 asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory"); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131} while(0)
132
David Howells29da7eb2006-10-16 14:10:49 +0100133#define __kunmap_atomic_secondary(slot, vaddr) \
134do { \
135 asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory"); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136} while(0)
137
Cong Wang144cf862012-06-27 13:02:49 +0800138static inline void kunmap_atomic_primary(void *kvaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Cong Wang144cf862012-06-27 13:02:49 +0800140 __kunmap_atomic_primary(1, 2);
Peter Zijlstraa8663742006-12-06 20:32:20 -0800141 pagefault_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
143
Cong Wanga24401b2011-11-26 10:53:39 +0800144void *kmap_atomic(struct page *page);
Peter Zijlstra3e4d3af2010-10-26 14:21:51 -0700145void __kunmap_atomic(void *kvaddr);
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147#endif /* !__ASSEMBLY__ */
148
149#endif /* __KERNEL__ */
150
151#endif /* _ASM_HIGHMEM_H */