diff options
author | Stephen Rothwell <sfr@canb.auug.org.au> | 2008-08-01 01:20:30 -0400 |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2008-08-03 22:02:00 -0400 |
commit | b8b572e1015f81b4e748417be2629dfe51ab99f9 (patch) | |
tree | 7df58667d5ed71d6c8f8f4ce40ca16b6fb776d0b /include/asm-powerpc/highmem.h | |
parent | 2b12a4c524812fb3f6ee590a02e65b95c8c32229 (diff) |
powerpc: Move include files to arch/powerpc/include/asm
from include/asm-powerpc. This is the result of a
mkdir arch/powerpc/include/asm
git mv include/asm-powerpc/* arch/powerpc/include/asm
Followed by a few documentation/comment fixups and a couple of places
where <asm-powepc/...> was being used explicitly. Of the latter only
one was outside the arch code and it is a driver only built for powerpc.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-powerpc/highmem.h')
-rw-r--r-- | include/asm-powerpc/highmem.h | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/include/asm-powerpc/highmem.h b/include/asm-powerpc/highmem.h deleted file mode 100644 index 5d99b6489d56..000000000000 --- a/include/asm-powerpc/highmem.h +++ /dev/null | |||
@@ -1,138 +0,0 @@ | |||
1 | /* | ||
2 | * highmem.h: virtual kernel memory mappings for high memory | ||
3 | * | ||
4 | * PowerPC version, stolen from the i386 version. | ||
5 | * | ||
6 | * Used in CONFIG_HIGHMEM systems for memory pages which | ||
7 | * are not addressable by direct kernel virtual addresses. | ||
8 | * | ||
9 | * Copyright (C) 1999 Gerhard Wichert, Siemens AG | ||
10 | * Gerhard.Wichert@pdb.siemens.de | ||
11 | * | ||
12 | * | ||
13 | * Redesigned the x86 32-bit VM architecture to deal with | ||
14 | * up to 16 Terrabyte physical memory. With current x86 CPUs | ||
15 | * we now support up to 64 Gigabytes physical RAM. | ||
16 | * | ||
17 | * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> | ||
18 | */ | ||
19 | |||
20 | #ifndef _ASM_HIGHMEM_H | ||
21 | #define _ASM_HIGHMEM_H | ||
22 | |||
23 | #ifdef __KERNEL__ | ||
24 | |||
25 | #include <linux/init.h> | ||
26 | #include <linux/interrupt.h> | ||
27 | #include <asm/kmap_types.h> | ||
28 | #include <asm/tlbflush.h> | ||
29 | #include <asm/page.h> | ||
30 | #include <asm/fixmap.h> | ||
31 | |||
32 | extern pte_t *kmap_pte; | ||
33 | extern pgprot_t kmap_prot; | ||
34 | extern pte_t *pkmap_page_table; | ||
35 | |||
36 | /* | ||
37 | * Right now we initialize only a single pte table. It can be extended | ||
38 | * easily, subsequent pte tables have to be allocated in one physical | ||
39 | * chunk of RAM. | ||
40 | */ | ||
41 | #define LAST_PKMAP (1 << PTE_SHIFT) | ||
42 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) | ||
43 | #define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK) | ||
44 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) | ||
45 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | ||
46 | |||
47 | extern void *kmap_high(struct page *page); | ||
48 | extern void kunmap_high(struct page *page); | ||
49 | |||
50 | static inline void *kmap(struct page *page) | ||
51 | { | ||
52 | might_sleep(); | ||
53 | if (!PageHighMem(page)) | ||
54 | return page_address(page); | ||
55 | return kmap_high(page); | ||
56 | } | ||
57 | |||
58 | static inline void kunmap(struct page *page) | ||
59 | { | ||
60 | BUG_ON(in_interrupt()); | ||
61 | if (!PageHighMem(page)) | ||
62 | return; | ||
63 | kunmap_high(page); | ||
64 | } | ||
65 | |||
66 | /* | ||
67 | * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap | ||
68 | * gives a more generic (and caching) interface. But kmap_atomic can | ||
69 | * be used in IRQ contexts, so in some (very limited) cases we need | ||
70 | * it. | ||
71 | */ | ||
72 | static inline void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot) | ||
73 | { | ||
74 | unsigned int idx; | ||
75 | unsigned long vaddr; | ||
76 | |||
77 | /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */ | ||
78 | pagefault_disable(); | ||
79 | if (!PageHighMem(page)) | ||
80 | return page_address(page); | ||
81 | |||
82 | idx = type + KM_TYPE_NR*smp_processor_id(); | ||
83 | vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); | ||
84 | #ifdef CONFIG_DEBUG_HIGHMEM | ||
85 | BUG_ON(!pte_none(*(kmap_pte-idx))); | ||
86 | #endif | ||
87 | set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot)); | ||
88 | flush_tlb_page(NULL, vaddr); | ||
89 | |||
90 | return (void*) vaddr; | ||
91 | } | ||
92 | |||
93 | static inline void *kmap_atomic(struct page *page, enum km_type type) | ||
94 | { | ||
95 | return kmap_atomic_prot(page, type, kmap_prot); | ||
96 | } | ||
97 | |||
98 | static inline void kunmap_atomic(void *kvaddr, enum km_type type) | ||
99 | { | ||
100 | #ifdef CONFIG_DEBUG_HIGHMEM | ||
101 | unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; | ||
102 | enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id(); | ||
103 | |||
104 | if (vaddr < __fix_to_virt(FIX_KMAP_END)) { | ||
105 | pagefault_enable(); | ||
106 | return; | ||
107 | } | ||
108 | |||
109 | BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); | ||
110 | |||
111 | /* | ||
112 | * force other mappings to Oops if they'll try to access | ||
113 | * this pte without first remap it | ||
114 | */ | ||
115 | pte_clear(&init_mm, vaddr, kmap_pte-idx); | ||
116 | flush_tlb_page(NULL, vaddr); | ||
117 | #endif | ||
118 | pagefault_enable(); | ||
119 | } | ||
120 | |||
121 | static inline struct page *kmap_atomic_to_page(void *ptr) | ||
122 | { | ||
123 | unsigned long idx, vaddr = (unsigned long) ptr; | ||
124 | pte_t *pte; | ||
125 | |||
126 | if (vaddr < FIXADDR_START) | ||
127 | return virt_to_page(ptr); | ||
128 | |||
129 | idx = virt_to_fix(vaddr); | ||
130 | pte = kmap_pte - (idx - FIX_KMAP_BEGIN); | ||
131 | return pte_page(*pte); | ||
132 | } | ||
133 | |||
134 | #define flush_cache_kmaps() flush_cache_all() | ||
135 | |||
136 | #endif /* __KERNEL__ */ | ||
137 | |||
138 | #endif /* _ASM_HIGHMEM_H */ | ||