projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| 1da177e4 LT |
9 | #include <linux/pagemap.h> |
| 10 | #include <linux/spinlock.h> | |
| 052e7994 | 11 | #include <linux/module.h> |
| 1da177e4 | 12 | |
| 1da177e4 LT |
13 | #include <asm/pgtable.h> |
| 14 | #include <asm/pgalloc.h> | |
| 15 | #include <asm/fixmap.h> | |
| 16 | #include <asm/e820.h> | |
| 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; | |
| 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 | 50 | if (pte_val(pteval)) |
| b40c7579 | 51 | set_pte_at(&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) | |
| 1da177e4 LT |
58 | */ |
| 59 | __flush_tlb_one(vaddr); | |
| 60 | } | |
| 61 | ||
| 052e7994 JF |
62 | unsigned long __FIXADDR_TOP = 0xfffff000; |
| 63 | EXPORT_SYMBOL(__FIXADDR_TOP); | |
| 052e7994 | 64 | |
| bef1568d YL |
65 | /* |
| 66 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
| 67 | * bytes. This can be used to increase (or decrease) the | |
| 68 | * vmalloc area - the default is 128m. | |
| 69 | */ | |
| 70 | static int __init parse_vmalloc(char *arg) | |
| 71 | { | |
| 72 | if (!arg) | |
| 73 | return -EINVAL; | |
| 74 | ||
| e621bd18 DY |
75 | /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ |
| 76 | __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; | |
| bef1568d YL |
77 | return 0; |
| 78 | } | |
| 79 | early_param("vmalloc", parse_vmalloc); | |
| 80 | ||
| 81 | /* | |
| 82 | * reservetop=size reserves a hole at the top of the kernel address space which | |
| 83 | * a hypervisor can load into later. Needed for dynamically loaded hypervisors, | |
| 84 | * so relocating the fixmap can be done before paging initialization. | |
| 85 | */ | |
| 86 | static int __init parse_reservetop(char *arg) | |
| 87 | { | |
| 88 | unsigned long address; | |
| 89 | ||
| 90 | if (!arg) | |
| 91 | return -EINVAL; | |
| 92 | ||
| 93 | address = memparse(arg, &arg); | |
| 94 | reserve_top_address(address); | |
| 5b7c73e0 | 95 | early_ioremap_init(); |
| bef1568d YL |
96 | return 0; |
| 97 | } | |
| 98 | early_param("reservetop", parse_reservetop); |