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 | ||
1da177e4 LT |
23 | /* |
24 | * Associate a virtual page frame with a given physical page frame | |
25 | * and protection flags for that frame. | |
26 | */ | |
d494a961 | 27 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
1da177e4 LT |
28 | { |
29 | pgd_t *pgd; | |
30 | pud_t *pud; | |
31 | pmd_t *pmd; | |
32 | pte_t *pte; | |
33 | ||
34 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
35 | if (pgd_none(*pgd)) { | |
36 | BUG(); | |
37 | return; | |
38 | } | |
39 | pud = pud_offset(pgd, vaddr); | |
40 | if (pud_none(*pud)) { | |
41 | BUG(); | |
42 | return; | |
43 | } | |
44 | pmd = pmd_offset(pud, vaddr); | |
45 | if (pmd_none(*pmd)) { | |
46 | BUG(); | |
47 | return; | |
48 | } | |
49 | pte = pte_offset_kernel(pmd, vaddr); | |
d494a961 JF |
50 | if (pte_val(pteval)) |
51 | set_pte_present(&init_mm, vaddr, pte, pteval); | |
b0bfece4 JB |
52 | else |
53 | pte_clear(&init_mm, vaddr, pte); | |
1da177e4 LT |
54 | |
55 | /* | |
56 | * It's enough to flush this one mapping. | |
57 | * (PGE mappings get flushed as well) | |
58 | */ | |
59 | __flush_tlb_one(vaddr); | |
60 | } | |
61 | ||
62 | /* | |
63 | * Associate a large virtual page frame with a given physical page frame | |
64 | * and protection flags for that frame. pfn is for the base of the page, | |
65 | * vaddr is what the page gets mapped to - both must be properly aligned. | |
66 | * The pmd must already be instantiated. Assumes PAE mode. | |
67 | */ | |
68 | void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) | |
69 | { | |
70 | pgd_t *pgd; | |
71 | pud_t *pud; | |
72 | pmd_t *pmd; | |
73 | ||
74 | if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */ | |
f90e7185 | 75 | printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n"); |
1da177e4 LT |
76 | return; /* BUG(); */ |
77 | } | |
78 | if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */ | |
f90e7185 | 79 | printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n"); |
1da177e4 LT |
80 | return; /* BUG(); */ |
81 | } | |
82 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
83 | if (pgd_none(*pgd)) { | |
f90e7185 | 84 | printk(KERN_WARNING "set_pmd_pfn: pgd_none\n"); |
1da177e4 LT |
85 | return; /* BUG(); */ |
86 | } | |
87 | pud = pud_offset(pgd, vaddr); | |
88 | pmd = pmd_offset(pud, vaddr); | |
89 | set_pmd(pmd, pfn_pmd(pfn, flags)); | |
90 | /* | |
91 | * It's enough to flush this one mapping. | |
92 | * (PGE mappings get flushed as well) | |
93 | */ | |
94 | __flush_tlb_one(vaddr); | |
95 | } | |
96 | ||
052e7994 JF |
97 | unsigned long __FIXADDR_TOP = 0xfffff000; |
98 | EXPORT_SYMBOL(__FIXADDR_TOP); | |
052e7994 | 99 | |
052e7994 JF |
100 | /** |
101 | * reserve_top_address - reserves a hole in the top of kernel address space | |
102 | * @reserve - size of hole to reserve | |
103 | * | |
104 | * Can be used to relocate the fixmap area and poke a hole in the top | |
105 | * of kernel address space to make room for a hypervisor. | |
106 | */ | |
bef1568d | 107 | void __init reserve_top_address(unsigned long reserve) |
052e7994 | 108 | { |
7c7e6e07 | 109 | BUG_ON(fixmaps_set > 0); |
7ce0bcfd ZA |
110 | printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", |
111 | (int)-reserve); | |
052e7994 JF |
112 | __FIXADDR_TOP = -reserve - PAGE_SIZE; |
113 | __VMALLOC_RESERVE += reserve; | |
1da177e4 | 114 | } |
bef1568d YL |
115 | |
116 | /* | |
117 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
118 | * bytes. This can be used to increase (or decrease) the | |
119 | * vmalloc area - the default is 128m. | |
120 | */ | |
121 | static int __init parse_vmalloc(char *arg) | |
122 | { | |
123 | if (!arg) | |
124 | return -EINVAL; | |
125 | ||
126 | __VMALLOC_RESERVE = memparse(arg, &arg); | |
127 | return 0; | |
128 | } | |
129 | early_param("vmalloc", parse_vmalloc); | |
130 | ||
131 | /* | |
132 | * reservetop=size reserves a hole at the top of the kernel address space which | |
133 | * a hypervisor can load into later. Needed for dynamically loaded hypervisors, | |
134 | * so relocating the fixmap can be done before paging initialization. | |
135 | */ | |
136 | static int __init parse_reservetop(char *arg) | |
137 | { | |
138 | unsigned long address; | |
139 | ||
140 | if (!arg) | |
141 | return -EINVAL; | |
142 | ||
143 | address = memparse(arg, &arg); | |
144 | reserve_top_address(address); | |
145 | return 0; | |
146 | } | |
147 | early_param("reservetop", parse_reservetop); |