Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/sched.h> |
2 | #include <linux/kernel.h> | |
3 | #include <linux/errno.h> | |
4 | #include <linux/mm.h> | |
27eb0b28 | 5 | #include <linux/nmi.h> |
1da177e4 LT |
6 | #include <linux/swap.h> |
7 | #include <linux/smp.h> | |
8 | #include <linux/highmem.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/pagemap.h> | |
11 | #include <linux/spinlock.h> | |
052e7994 | 12 | #include <linux/module.h> |
f1d1a842 | 13 | #include <linux/quicklist.h> |
1da177e4 LT |
14 | |
15 | #include <asm/system.h> | |
16 | #include <asm/pgtable.h> | |
17 | #include <asm/pgalloc.h> | |
18 | #include <asm/fixmap.h> | |
19 | #include <asm/e820.h> | |
20 | #include <asm/tlb.h> | |
21 | #include <asm/tlbflush.h> | |
22 | ||
2b688dfd PE |
23 | unsigned int __VMALLOC_RESERVE = 128 << 20; |
24 | ||
1da177e4 LT |
25 | /* |
26 | * Associate a virtual page frame with a given physical page frame | |
27 | * and protection flags for that frame. | |
28 | */ | |
d494a961 | 29 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
1da177e4 LT |
30 | { |
31 | pgd_t *pgd; | |
32 | pud_t *pud; | |
33 | pmd_t *pmd; | |
34 | pte_t *pte; | |
35 | ||
36 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
37 | if (pgd_none(*pgd)) { | |
38 | BUG(); | |
39 | return; | |
40 | } | |
41 | pud = pud_offset(pgd, vaddr); | |
42 | if (pud_none(*pud)) { | |
43 | BUG(); | |
44 | return; | |
45 | } | |
46 | pmd = pmd_offset(pud, vaddr); | |
47 | if (pmd_none(*pmd)) { | |
48 | BUG(); | |
49 | return; | |
50 | } | |
51 | pte = pte_offset_kernel(pmd, vaddr); | |
d494a961 | 52 | if (pte_val(pteval)) |
b40c7579 | 53 | set_pte_at(&init_mm, vaddr, pte, pteval); |
b0bfece4 JB |
54 | else |
55 | pte_clear(&init_mm, vaddr, pte); | |
1da177e4 LT |
56 | |
57 | /* | |
58 | * It's enough to flush this one mapping. | |
59 | * (PGE mappings get flushed as well) | |
60 | */ | |
61 | __flush_tlb_one(vaddr); | |
62 | } | |
63 | ||
64 | /* | |
65 | * Associate a large virtual page frame with a given physical page frame | |
66 | * and protection flags for that frame. pfn is for the base of the page, | |
67 | * vaddr is what the page gets mapped to - both must be properly aligned. | |
68 | * The pmd must already be instantiated. Assumes PAE mode. | |
69 | */ | |
70 | void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) | |
71 | { | |
72 | pgd_t *pgd; | |
73 | pud_t *pud; | |
74 | pmd_t *pmd; | |
75 | ||
76 | if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */ | |
f90e7185 | 77 | printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n"); |
1da177e4 LT |
78 | return; /* BUG(); */ |
79 | } | |
80 | if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */ | |
f90e7185 | 81 | printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n"); |
1da177e4 LT |
82 | return; /* BUG(); */ |
83 | } | |
84 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
85 | if (pgd_none(*pgd)) { | |
f90e7185 | 86 | printk(KERN_WARNING "set_pmd_pfn: pgd_none\n"); |
1da177e4 LT |
87 | return; /* BUG(); */ |
88 | } | |
89 | pud = pud_offset(pgd, vaddr); | |
90 | pmd = pmd_offset(pud, vaddr); | |
91 | set_pmd(pmd, pfn_pmd(pfn, flags)); | |
92 | /* | |
93 | * It's enough to flush this one mapping. | |
94 | * (PGE mappings get flushed as well) | |
95 | */ | |
96 | __flush_tlb_one(vaddr); | |
97 | } | |
98 | ||
052e7994 JF |
99 | unsigned long __FIXADDR_TOP = 0xfffff000; |
100 | EXPORT_SYMBOL(__FIXADDR_TOP); | |
052e7994 | 101 | |
bef1568d YL |
102 | /* |
103 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
104 | * bytes. This can be used to increase (or decrease) the | |
105 | * vmalloc area - the default is 128m. | |
106 | */ | |
107 | static int __init parse_vmalloc(char *arg) | |
108 | { | |
109 | if (!arg) | |
110 | return -EINVAL; | |
111 | ||
e621bd18 DY |
112 | /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ |
113 | __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; | |
bef1568d YL |
114 | return 0; |
115 | } | |
116 | early_param("vmalloc", parse_vmalloc); | |
117 | ||
118 | /* | |
119 | * reservetop=size reserves a hole at the top of the kernel address space which | |
120 | * a hypervisor can load into later. Needed for dynamically loaded hypervisors, | |
121 | * so relocating the fixmap can be done before paging initialization. | |
122 | */ | |
123 | static int __init parse_reservetop(char *arg) | |
124 | { | |
125 | unsigned long address; | |
126 | ||
127 | if (!arg) | |
128 | return -EINVAL; | |
129 | ||
130 | address = memparse(arg, &arg); | |
131 | reserve_top_address(address); | |
132 | return 0; | |
133 | } | |
134 | early_param("reservetop", parse_reservetop); |