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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | #include <linux/sched.h> |
3 | #include <linux/kernel.h> | |
4 | #include <linux/errno.h> | |
5 | #include <linux/mm.h> | |
27eb0b28 | 6 | #include <linux/nmi.h> |
1da177e4 LT |
7 | #include <linux/swap.h> |
8 | #include <linux/smp.h> | |
9 | #include <linux/highmem.h> | |
1da177e4 LT |
10 | #include <linux/pagemap.h> |
11 | #include <linux/spinlock.h> | |
12 | ||
92a0f81d | 13 | #include <asm/cpu_entry_area.h> |
1da177e4 LT |
14 | #include <asm/pgtable.h> |
15 | #include <asm/pgalloc.h> | |
16 | #include <asm/fixmap.h> | |
66441bd3 | 17 | #include <asm/e820/api.h> |
1da177e4 LT |
18 | #include <asm/tlb.h> |
19 | #include <asm/tlbflush.h> | |
56f0e74c | 20 | #include <asm/io.h> |
1da177e4 | 21 | |
2b688dfd PE |
22 | unsigned int __VMALLOC_RESERVE = 128 << 20; |
23 | ||
1da177e4 LT |
24 | /* |
25 | * Associate a virtual page frame with a given physical page frame | |
26 | * and protection flags for that frame. | |
27 | */ | |
d494a961 | 28 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
1da177e4 LT |
29 | { |
30 | pgd_t *pgd; | |
e0c4f675 | 31 | p4d_t *p4d; |
1da177e4 LT |
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 | } | |
e0c4f675 KS |
41 | p4d = p4d_offset(pgd, vaddr); |
42 | if (p4d_none(*p4d)) { | |
43 | BUG(); | |
44 | return; | |
45 | } | |
46 | pud = pud_offset(p4d, vaddr); | |
1da177e4 LT |
47 | if (pud_none(*pud)) { |
48 | BUG(); | |
49 | return; | |
50 | } | |
51 | pmd = pmd_offset(pud, vaddr); | |
52 | if (pmd_none(*pmd)) { | |
53 | BUG(); | |
54 | return; | |
55 | } | |
56 | pte = pte_offset_kernel(pmd, vaddr); | |
dcb32d99 | 57 | if (!pte_none(pteval)) |
b40c7579 | 58 | set_pte_at(&init_mm, vaddr, pte, pteval); |
b0bfece4 JB |
59 | else |
60 | pte_clear(&init_mm, vaddr, pte); | |
1da177e4 LT |
61 | |
62 | /* | |
63 | * It's enough to flush this one mapping. | |
64 | * (PGE mappings get flushed as well) | |
1da177e4 LT |
65 | */ |
66 | __flush_tlb_one(vaddr); | |
67 | } | |
68 | ||
052e7994 JF |
69 | unsigned long __FIXADDR_TOP = 0xfffff000; |
70 | EXPORT_SYMBOL(__FIXADDR_TOP); | |
052e7994 | 71 | |
bef1568d YL |
72 | /* |
73 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
74 | * bytes. This can be used to increase (or decrease) the | |
75 | * vmalloc area - the default is 128m. | |
76 | */ | |
77 | static int __init parse_vmalloc(char *arg) | |
78 | { | |
79 | if (!arg) | |
80 | return -EINVAL; | |
81 | ||
e621bd18 DY |
82 | /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ |
83 | __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; | |
bef1568d YL |
84 | return 0; |
85 | } | |
86 | early_param("vmalloc", parse_vmalloc); | |
87 | ||
88 | /* | |
89 | * reservetop=size reserves a hole at the top of the kernel address space which | |
90 | * a hypervisor can load into later. Needed for dynamically loaded hypervisors, | |
91 | * so relocating the fixmap can be done before paging initialization. | |
92 | */ | |
93 | static int __init parse_reservetop(char *arg) | |
94 | { | |
95 | unsigned long address; | |
96 | ||
97 | if (!arg) | |
98 | return -EINVAL; | |
99 | ||
100 | address = memparse(arg, &arg); | |
101 | reserve_top_address(address); | |
5b7c73e0 | 102 | early_ioremap_init(); |
bef1568d YL |
103 | return 0; |
104 | } | |
105 | early_param("reservetop", parse_reservetop); |