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Linux kernel mirror (for testing)
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linux
1/* 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 *
7 * See Documentation/frv/mmu-layout.txt for more information.
8 *
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
20#include <linux/init.h>
21#include <linux/highmem.h>
22#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
65#endif /* !__ASSEMBLY__ */
66
67/*
68 * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
69 * gives a more generic (and caching) interface. But kmap_atomic can
70 * be used in IRQ contexts, so in some (very limited) cases we need
71 * it.
72 */
73#define KMAP_ATOMIC_CACHE_DAMR 8
74
75#ifndef __ASSEMBLY__
76
77#define __kmap_atomic_primary(cached, paddr, ampr) \
78({ \
79 unsigned long damlr, dampr; \
80 \
81 dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
82 \
83 if (!cached) \
84 asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory"); \
85 else \
86 /* cache flush page attachment point */ \
87 asm volatile("movgs %0,iampr"#ampr"\n" \
88 "movgs %0,dampr"#ampr"\n" \
89 :: "r"(dampr) : "memory" \
90 ); \
91 \
92 asm("movsg damlr"#ampr",%0" : "=r"(damlr)); \
93 \
94 /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/ \
95 \
96 (void *) damlr; \
97})
98
99#define __kmap_atomic_secondary(slot, paddr) \
100({ \
101 unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE; \
102 unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
103 \
104 asm volatile("movgs %0,tplr \n" \
105 "movgs %1,tppr \n" \
106 "tlbpr %0,gr0,#2,#1" \
107 : : "r"(damlr), "r"(dampr) : "memory"); \
108 \
109 /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \
110 \
111 (void *) damlr; \
112})
113
114static inline void *kmap_atomic_primary(struct page *page)
115{
116 unsigned long paddr;
117
118 pagefault_disable();
119 paddr = page_to_phys(page);
120
121 return __kmap_atomic_primary(1, paddr, 2);
122}
123
124#define __kunmap_atomic_primary(cached, ampr) \
125do { \
126 asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory"); \
127 if (cached) \
128 asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory"); \
129} while(0)
130
131#define __kunmap_atomic_secondary(slot, vaddr) \
132do { \
133 asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory"); \
134} while(0)
135
136static inline void kunmap_atomic_primary(void *kvaddr)
137{
138 __kunmap_atomic_primary(1, 2);
139 pagefault_enable();
140}
141
142void *kmap_atomic(struct page *page);
143void __kunmap_atomic(void *kvaddr);
144
145#endif /* !__ASSEMBLY__ */
146
147#endif /* __KERNEL__ */
148
149#endif /* _ASM_HIGHMEM_H */