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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-sparc/] [highmem.h] - Blame information for rev 1774

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/*
 * highmem.h: virtual kernel memory mappings for high memory
 *
 * Used in CONFIG_HIGHMEM systems for memory pages which
 * are not addressable by direct kernel virtual addresses.
 *
 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
 *                    Gerhard.Wichert@pdb.siemens.de
 *
 *
 * Redesigned the x86 32-bit VM architecture to deal with
 * up to 16 Terrabyte physical memory. With current x86 CPUs
 * we now support up to 64 Gigabytes physical RAM.
 *
 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
 */
 
#ifndef _ASM_HIGHMEM_H
#define _ASM_HIGHMEM_H
 
#ifdef __KERNEL__
 
#include <linux/interrupt.h>
#include <asm/kmap_types.h>
 
/* undef for production */
#define HIGHMEM_DEBUG 1
 
/* in mm/highmem.c */
extern void *kmap_high(struct page *page, int nonblocking);
extern void kunmap_high(struct page *page);
 
/* declarations for highmem.c */
extern unsigned long highstart_pfn, highend_pfn;
 
extern pte_t *kmap_pte;
extern pgprot_t kmap_prot;
extern pte_t *pkmap_page_table;
 
/* This gets set in {srmmu,sun4c}_paging_init() */
extern unsigned long fix_kmap_begin;
 
/* Only used and set with srmmu? */
extern unsigned long pkmap_base;
 
extern void kmap_init(void) __init;
 
/*
 * Right now we initialize only a single pte table. It can be extended
 * easily, subsequent pte tables have to be allocated in one physical
 * chunk of RAM.
 */
#define LAST_PKMAP 1024
 
#define LAST_PKMAP_MASK         (LAST_PKMAP - 1)
#define PKMAP_NR(virt)          ((virt - pkmap_base) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr)          (pkmap_base + ((nr) << PAGE_SHIFT))
 
/* in arch/sparc/mm/highmem.c */
void *kmap_atomic(struct page *page, enum km_type type);
void kunmap_atomic(void *kvaddr, enum km_type type);
 
#define kmap(page) __kmap(page, 0)
#define kmap_nonblock(page) __kmap(page, 1)
 
static inline void *__kmap(struct page *page, int nonblocking)
{
        if (in_interrupt())
                BUG();
        if (page < highmem_start_page)
                return page_address(page);
        return kmap_high(page, nonblocking);
}
 
static inline void kunmap(struct page *page)
{
        if (in_interrupt())
                BUG();
        if (page < highmem_start_page)
                return;
        kunmap_high(page);
}
 
#endif /* __KERNEL__ */
 
#endif /* _ASM_HIGHMEM_H */

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* highmem.h: virtual kernel memory mappings for high memory`
3			`*`
4			`* Used in CONFIG_HIGHMEM systems for memory pages which`
5			`* are not addressable by direct kernel virtual addresses.`
6			`*`
7			`* Copyright (C) 1999 Gerhard Wichert, Siemens AG`
8			`* Gerhard.Wichert@pdb.siemens.de`
9			`*`
10			`*`
11			`* Redesigned the x86 32-bit VM architecture to deal with`
12			`* up to 16 Terrabyte physical memory. With current x86 CPUs`
13			`* we now support up to 64 Gigabytes physical RAM.`
14			`*`
15			`* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>`
16			`*/`
17
18			`#ifndef _ASM_HIGHMEM_H`
19			`#define _ASM_HIGHMEM_H`
20
21			`#ifdef __KERNEL__`
22
23			`#include <linux/interrupt.h>`
24			`#include <asm/kmap_types.h>`
25
26			`/* undef for production */`
27			`#define HIGHMEM_DEBUG 1`
28
29			`/* in mm/highmem.c */`
30			`extern void kmap_high(struct page page, int nonblocking);`
31			`extern void kunmap_high(struct page *page);`
32
33			`/* declarations for highmem.c */`
34			`extern unsigned long highstart_pfn, highend_pfn;`
35
36			`extern pte_t *kmap_pte;`
37			`extern pgprot_t kmap_prot;`
38			`extern pte_t *pkmap_page_table;`
39
40			`/* This gets set in {srmmu,sun4c}_paging_init() */`
41			`extern unsigned long fix_kmap_begin;`
42
43			`/* Only used and set with srmmu? */`
44			`extern unsigned long pkmap_base;`
45
46			`extern void kmap_init(void) __init;`
47
48			`/*`
49			`* Right now we initialize only a single pte table. It can be extended`
50			`* easily, subsequent pte tables have to be allocated in one physical`
51			`* chunk of RAM.`
52			`*/`
53			`#define LAST_PKMAP 1024`
54
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
59			`/* in arch/sparc/mm/highmem.c */`
60			`void kmap_atomic(struct page page, enum km_type type);`
61			`void kunmap_atomic(void *kvaddr, enum km_type type);`
62
63			`#define kmap(page) __kmap(page, 0)`
64			`#define kmap_nonblock(page) __kmap(page, 1)`
65
66			`static inline void __kmap(struct page page, int nonblocking)`
67			`{`
68			`if (in_interrupt())`
69			`BUG();`
70			`if (page < highmem_start_page)`
71			`return page_address(page);`
72			`return kmap_high(page, nonblocking);`
73			`}`
74
75			`static inline void kunmap(struct page *page)`
76			`{`
77			`if (in_interrupt())`
78			`BUG();`
79			`if (page < highmem_start_page)`
80			`return;`
81			`kunmap_high(page);`
82			`}`
83
84			`#endif /* __KERNEL__ */`
85
86			`#endif /* _ASM_HIGHMEM_H */`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-sparc/] [highmem.h] - Blame information for rev 1774