projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 1da177e4 LT |
13 | #include <asm/pgtable.h> |
| 14 | #include <asm/pgalloc.h> | |
| 15 | #include <asm/fixmap.h> | |
| 66441bd3 | 16 | #include <asm/e820/api.h> |
| 1da177e4 LT |
17 | #include <asm/tlb.h> |
| 18 | #include <asm/tlbflush.h> | |
| 56f0e74c | 19 | #include <asm/io.h> |
| 1da177e4 | 20 | |
| 2b688dfd PE |
21 | unsigned int __VMALLOC_RESERVE = 128 << 20; |
| 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; | |
| e0c4f675 | 30 | p4d_t *p4d; |
| 1da177e4 LT |
31 | pud_t *pud; |
| 32 | pmd_t *pmd; | |
| 33 | pte_t *pte; | |
| 34 | ||
| 35 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
| 36 | if (pgd_none(*pgd)) { | |
| 37 | BUG(); | |
| 38 | return; | |
| 39 | } | |
| e0c4f675 KS |
40 | p4d = p4d_offset(pgd, vaddr); |
| 41 | if (p4d_none(*p4d)) { | |
| 42 | BUG(); | |
| 43 | return; | |
| 44 | } | |
| 45 | pud = pud_offset(p4d, vaddr); | |
| 1da177e4 LT |
46 | if (pud_none(*pud)) { |
| 47 | BUG(); | |
| 48 | return; | |
| 49 | } | |
| 50 | pmd = pmd_offset(pud, vaddr); | |
| 51 | if (pmd_none(*pmd)) { | |
| 52 | BUG(); | |
| 53 | return; | |
| 54 | } | |
| 55 | pte = pte_offset_kernel(pmd, vaddr); | |
| dcb32d99 | 56 | if (!pte_none(pteval)) |
| b40c7579 | 57 | set_pte_at(&init_mm, vaddr, pte, pteval); |
| b0bfece4 JB |
58 | else |
| 59 | pte_clear(&init_mm, vaddr, pte); | |
| 1da177e4 LT |
60 | |
| 61 | /* | |
| 62 | * It's enough to flush this one mapping. | |
| 63 | * (PGE mappings get flushed as well) | |
| 1da177e4 LT |
64 | */ |
| 65 | __flush_tlb_one(vaddr); | |
| 66 | } | |
| 67 | ||
| 052e7994 JF |
68 | unsigned long __FIXADDR_TOP = 0xfffff000; |
| 69 | EXPORT_SYMBOL(__FIXADDR_TOP); | |
| 052e7994 | 70 | |
| bef1568d YL |
71 | /* |
| 72 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
| 73 | * bytes. This can be used to increase (or decrease) the | |
| 74 | * vmalloc area - the default is 128m. | |
| 75 | */ | |
| 76 | static int __init parse_vmalloc(char *arg) | |
| 77 | { | |
| 78 | if (!arg) | |
| 79 | return -EINVAL; | |
| 80 | ||
| e621bd18 DY |
81 | /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ |
| 82 | __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; | |
| bef1568d YL |
83 | return 0; |
| 84 | } | |
| 85 | early_param("vmalloc", parse_vmalloc); | |
| 86 | ||
| 87 | /* | |
| 88 | * reservetop=size reserves a hole at the top of the kernel address space which | |
| 89 | * a hypervisor can load into later. Needed for dynamically loaded hypervisors, | |
| 90 | * so relocating the fixmap can be done before paging initialization. | |
| 91 | */ | |
| 92 | static int __init parse_reservetop(char *arg) | |
| 93 | { | |
| 94 | unsigned long address; | |
| 95 | ||
| 96 | if (!arg) | |
| 97 | return -EINVAL; | |
| 98 | ||
| 99 | address = memparse(arg, &arg); | |
| 100 | reserve_top_address(address); | |
| 5b7c73e0 | 101 | early_ioremap_init(); |
| bef1568d YL |
102 | return 0; |
| 103 | } | |
| 104 | early_param("reservetop", parse_reservetop); |