Commit | Line | Data |
---|---|---|
74588d8b HS |
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 | */ | |
74588d8b HS |
8 | #include <linux/vmalloc.h> |
9 | #include <linux/mm.h> | |
e8edc6e0 | 10 | #include <linux/sched.h> |
53fa6645 | 11 | #include <linux/io.h> |
8bc3bcc9 | 12 | #include <linux/export.h> |
74588d8b HS |
13 | #include <asm/cacheflush.h> |
14 | #include <asm/pgtable.h> | |
15 | ||
0ddab1d2 | 16 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
c2febafc | 17 | static int __read_mostly ioremap_p4d_capable; |
6b637835 TK |
18 | static int __read_mostly ioremap_pud_capable; |
19 | static int __read_mostly ioremap_pmd_capable; | |
20 | static int __read_mostly ioremap_huge_disabled; | |
0ddab1d2 TK |
21 | |
22 | static int __init set_nohugeiomap(char *str) | |
23 | { | |
24 | ioremap_huge_disabled = 1; | |
25 | return 0; | |
26 | } | |
27 | early_param("nohugeiomap", set_nohugeiomap); | |
28 | ||
29 | void __init ioremap_huge_init(void) | |
30 | { | |
31 | if (!ioremap_huge_disabled) { | |
32 | if (arch_ioremap_pud_supported()) | |
33 | ioremap_pud_capable = 1; | |
34 | if (arch_ioremap_pmd_supported()) | |
35 | ioremap_pmd_capable = 1; | |
36 | } | |
37 | } | |
38 | ||
c2febafc KS |
39 | static inline int ioremap_p4d_enabled(void) |
40 | { | |
41 | return ioremap_p4d_capable; | |
42 | } | |
43 | ||
0ddab1d2 TK |
44 | static inline int ioremap_pud_enabled(void) |
45 | { | |
46 | return ioremap_pud_capable; | |
47 | } | |
48 | ||
49 | static inline int ioremap_pmd_enabled(void) | |
50 | { | |
51 | return ioremap_pmd_capable; | |
52 | } | |
53 | ||
54 | #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ | |
c2febafc | 55 | static inline int ioremap_p4d_enabled(void) { return 0; } |
0ddab1d2 TK |
56 | static inline int ioremap_pud_enabled(void) { return 0; } |
57 | static inline int ioremap_pmd_enabled(void) { return 0; } | |
58 | #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ | |
59 | ||
74588d8b | 60 | static int ioremap_pte_range(pmd_t *pmd, unsigned long addr, |
ffa71f33 | 61 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
74588d8b HS |
62 | { |
63 | pte_t *pte; | |
ffa71f33 | 64 | u64 pfn; |
74588d8b HS |
65 | |
66 | pfn = phys_addr >> PAGE_SHIFT; | |
67 | pte = pte_alloc_kernel(pmd, addr); | |
68 | if (!pte) | |
69 | return -ENOMEM; | |
70 | do { | |
71 | BUG_ON(!pte_none(*pte)); | |
72 | set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot)); | |
73 | pfn++; | |
74 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
75 | return 0; | |
76 | } | |
77 | ||
78 | static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr, | |
ffa71f33 | 79 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
74588d8b HS |
80 | { |
81 | pmd_t *pmd; | |
82 | unsigned long next; | |
83 | ||
84 | phys_addr -= addr; | |
85 | pmd = pmd_alloc(&init_mm, pud, addr); | |
86 | if (!pmd) | |
87 | return -ENOMEM; | |
88 | do { | |
89 | next = pmd_addr_end(addr, end); | |
e61ce6ad TK |
90 | |
91 | if (ioremap_pmd_enabled() && | |
92 | ((next - addr) == PMD_SIZE) && | |
93 | IS_ALIGNED(phys_addr + addr, PMD_SIZE)) { | |
94 | if (pmd_set_huge(pmd, phys_addr + addr, prot)) | |
95 | continue; | |
96 | } | |
97 | ||
74588d8b HS |
98 | if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot)) |
99 | return -ENOMEM; | |
100 | } while (pmd++, addr = next, addr != end); | |
101 | return 0; | |
102 | } | |
103 | ||
c2febafc | 104 | static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr, |
ffa71f33 | 105 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
74588d8b HS |
106 | { |
107 | pud_t *pud; | |
108 | unsigned long next; | |
109 | ||
110 | phys_addr -= addr; | |
c2febafc | 111 | pud = pud_alloc(&init_mm, p4d, addr); |
74588d8b HS |
112 | if (!pud) |
113 | return -ENOMEM; | |
114 | do { | |
115 | next = pud_addr_end(addr, end); | |
e61ce6ad TK |
116 | |
117 | if (ioremap_pud_enabled() && | |
118 | ((next - addr) == PUD_SIZE) && | |
119 | IS_ALIGNED(phys_addr + addr, PUD_SIZE)) { | |
120 | if (pud_set_huge(pud, phys_addr + addr, prot)) | |
121 | continue; | |
122 | } | |
123 | ||
74588d8b HS |
124 | if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot)) |
125 | return -ENOMEM; | |
126 | } while (pud++, addr = next, addr != end); | |
127 | return 0; | |
128 | } | |
129 | ||
c2febafc KS |
130 | static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr, |
131 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) | |
132 | { | |
133 | p4d_t *p4d; | |
134 | unsigned long next; | |
135 | ||
136 | phys_addr -= addr; | |
137 | p4d = p4d_alloc(&init_mm, pgd, addr); | |
138 | if (!p4d) | |
139 | return -ENOMEM; | |
140 | do { | |
141 | next = p4d_addr_end(addr, end); | |
142 | ||
143 | if (ioremap_p4d_enabled() && | |
144 | ((next - addr) == P4D_SIZE) && | |
145 | IS_ALIGNED(phys_addr + addr, P4D_SIZE)) { | |
146 | if (p4d_set_huge(p4d, phys_addr + addr, prot)) | |
147 | continue; | |
148 | } | |
149 | ||
150 | if (ioremap_pud_range(p4d, addr, next, phys_addr + addr, prot)) | |
151 | return -ENOMEM; | |
152 | } while (p4d++, addr = next, addr != end); | |
153 | return 0; | |
154 | } | |
155 | ||
74588d8b | 156 | int ioremap_page_range(unsigned long addr, |
ffa71f33 | 157 | unsigned long end, phys_addr_t phys_addr, pgprot_t prot) |
74588d8b HS |
158 | { |
159 | pgd_t *pgd; | |
160 | unsigned long start; | |
161 | unsigned long next; | |
162 | int err; | |
163 | ||
164 | BUG_ON(addr >= end); | |
165 | ||
74588d8b HS |
166 | start = addr; |
167 | phys_addr -= addr; | |
168 | pgd = pgd_offset_k(addr); | |
169 | do { | |
170 | next = pgd_addr_end(addr, end); | |
c2febafc | 171 | err = ioremap_p4d_range(pgd, addr, next, phys_addr+addr, prot); |
74588d8b HS |
172 | if (err) |
173 | break; | |
174 | } while (pgd++, addr = next, addr != end); | |
175 | ||
db71daab | 176 | flush_cache_vmap(start, end); |
74588d8b HS |
177 | |
178 | return err; | |
179 | } |