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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/export.h>
13#include <asm/cacheflush.h>
14#include <asm/pgtable.h>
15
16static 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
34static 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
52static 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
70int 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}
94EXPORT_SYMBOL_GPL(ioremap_page_range);
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/export.h>
13#include <asm/cacheflush.h>
14#include <asm/pgtable.h>
15
16#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
17static int __read_mostly ioremap_pud_capable;
18static int __read_mostly ioremap_pmd_capable;
19static int __read_mostly ioremap_huge_disabled;
20
21static int __init set_nohugeiomap(char *str)
22{
23 ioremap_huge_disabled = 1;
24 return 0;
25}
26early_param("nohugeiomap", set_nohugeiomap);
27
28void __init ioremap_huge_init(void)
29{
30 if (!ioremap_huge_disabled) {
31 if (arch_ioremap_pud_supported())
32 ioremap_pud_capable = 1;
33 if (arch_ioremap_pmd_supported())
34 ioremap_pmd_capable = 1;
35 }
36}
37
38static inline int ioremap_pud_enabled(void)
39{
40 return ioremap_pud_capable;
41}
42
43static inline int ioremap_pmd_enabled(void)
44{
45 return ioremap_pmd_capable;
46}
47
48#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
49static inline int ioremap_pud_enabled(void) { return 0; }
50static inline int ioremap_pmd_enabled(void) { return 0; }
51#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
52
53static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
54 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
55{
56 pte_t *pte;
57 u64 pfn;
58
59 pfn = phys_addr >> PAGE_SHIFT;
60 pte = pte_alloc_kernel(pmd, addr);
61 if (!pte)
62 return -ENOMEM;
63 do {
64 BUG_ON(!pte_none(*pte));
65 set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
66 pfn++;
67 } while (pte++, addr += PAGE_SIZE, addr != end);
68 return 0;
69}
70
71static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
72 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
73{
74 pmd_t *pmd;
75 unsigned long next;
76
77 phys_addr -= addr;
78 pmd = pmd_alloc(&init_mm, pud, addr);
79 if (!pmd)
80 return -ENOMEM;
81 do {
82 next = pmd_addr_end(addr, end);
83
84 if (ioremap_pmd_enabled() &&
85 ((next - addr) == PMD_SIZE) &&
86 IS_ALIGNED(phys_addr + addr, PMD_SIZE)) {
87 if (pmd_set_huge(pmd, phys_addr + addr, prot))
88 continue;
89 }
90
91 if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
92 return -ENOMEM;
93 } while (pmd++, addr = next, addr != end);
94 return 0;
95}
96
97static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
98 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
99{
100 pud_t *pud;
101 unsigned long next;
102
103 phys_addr -= addr;
104 pud = pud_alloc(&init_mm, pgd, addr);
105 if (!pud)
106 return -ENOMEM;
107 do {
108 next = pud_addr_end(addr, end);
109
110 if (ioremap_pud_enabled() &&
111 ((next - addr) == PUD_SIZE) &&
112 IS_ALIGNED(phys_addr + addr, PUD_SIZE)) {
113 if (pud_set_huge(pud, phys_addr + addr, prot))
114 continue;
115 }
116
117 if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
118 return -ENOMEM;
119 } while (pud++, addr = next, addr != end);
120 return 0;
121}
122
123int ioremap_page_range(unsigned long addr,
124 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
125{
126 pgd_t *pgd;
127 unsigned long start;
128 unsigned long next;
129 int err;
130
131 BUG_ON(addr >= end);
132
133 start = addr;
134 phys_addr -= addr;
135 pgd = pgd_offset_k(addr);
136 do {
137 next = pgd_addr_end(addr, end);
138 err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot);
139 if (err)
140 break;
141 } while (pgd++, addr = next, addr != end);
142
143 flush_cache_vmap(start, end);
144
145 return err;
146}
147EXPORT_SYMBOL_GPL(ioremap_page_range);