Root/
Source at commit b13e7eb172b6f08e5fc22da162bdde5fcde201b5 created 11 years 11 months ago. By Maarten ter Huurne, fbcon: Add 6x10 font | |
---|---|
1 | /* |
2 | * Re-map IO memory to kernel address space so that we can access it. |
3 | * This is needed for high PCI addresses that aren't mapped in the |
4 | * 640k-1MB IO memory area on PC's |
5 | * |
6 | * (C) Copyright 1995 1996 Linus Torvalds |
7 | */ |
8 | #include <linux/vmalloc.h> |
9 | #include <linux/mm.h> |
10 | #include <linux/sched.h> |
11 | #include <linux/io.h> |
12 | #include <linux/module.h> |
13 | #include <asm/cacheflush.h> |
14 | #include <asm/pgtable.h> |
15 | |
16 | static int ioremap_pte_range(pmd_t *pmd, unsigned long addr, |
17 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
18 | { |
19 | pte_t *pte; |
20 | u64 pfn; |
21 | |
22 | pfn = phys_addr >> PAGE_SHIFT; |
23 | pte = pte_alloc_kernel(pmd, addr); |
24 | if (!pte) |
25 | return -ENOMEM; |
26 | do { |
27 | BUG_ON(!pte_none(*pte)); |
28 | set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot)); |
29 | pfn++; |
30 | } while (pte++, addr += PAGE_SIZE, addr != end); |
31 | return 0; |
32 | } |
33 | |
34 | static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr, |
35 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
36 | { |
37 | pmd_t *pmd; |
38 | unsigned long next; |
39 | |
40 | phys_addr -= addr; |
41 | pmd = pmd_alloc(&init_mm, pud, addr); |
42 | if (!pmd) |
43 | return -ENOMEM; |
44 | do { |
45 | next = pmd_addr_end(addr, end); |
46 | if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot)) |
47 | return -ENOMEM; |
48 | } while (pmd++, addr = next, addr != end); |
49 | return 0; |
50 | } |
51 | |
52 | static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr, |
53 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
54 | { |
55 | pud_t *pud; |
56 | unsigned long next; |
57 | |
58 | phys_addr -= addr; |
59 | pud = pud_alloc(&init_mm, pgd, addr); |
60 | if (!pud) |
61 | return -ENOMEM; |
62 | do { |
63 | next = pud_addr_end(addr, end); |
64 | if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot)) |
65 | return -ENOMEM; |
66 | } while (pud++, addr = next, addr != end); |
67 | return 0; |
68 | } |
69 | |
70 | int ioremap_page_range(unsigned long addr, |
71 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
72 | { |
73 | pgd_t *pgd; |
74 | unsigned long start; |
75 | unsigned long next; |
76 | int err; |
77 | |
78 | BUG_ON(addr >= end); |
79 | |
80 | start = addr; |
81 | phys_addr -= addr; |
82 | pgd = pgd_offset_k(addr); |
83 | do { |
84 | next = pgd_addr_end(addr, end); |
85 | err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot); |
86 | if (err) |
87 | break; |
88 | } while (pgd++, addr = next, addr != end); |
89 | |
90 | flush_cache_vmap(start, end); |
91 | |
92 | return err; |
93 | } |
94 | EXPORT_SYMBOL_GPL(ioremap_page_range); |
95 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9