Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #include <linux/sched.h> |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/errno.h> |
| 4 | #include <linux/mm.h> |
Prarit Bhargava | 27eb0b2 | 2007-10-17 18:04:34 +0200 | [diff] [blame] | 5 | #include <linux/nmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/swap.h> |
| 7 | #include <linux/smp.h> |
| 8 | #include <linux/highmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/pagemap.h> |
| 10 | #include <linux/spinlock.h> |
Jeremy Fitzhardinge | 052e799 | 2006-09-25 23:32:25 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Ingo Molnar | 56f0e74 | 2010-05-03 09:19:43 +0200 | [diff] [blame] | 19 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Pekka Enberg | 2b688df | 2009-03-03 12:55:04 +0200 | [diff] [blame] | 21 | unsigned int __VMALLOC_RESERVE = 128 << 20; |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | /* |
| 24 | * Associate a virtual page frame with a given physical page frame |
| 25 | * and protection flags for that frame. |
| 26 | */ |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 27 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 50 | if (pte_val(pteval)) |
Jeremy Fitzhardinge | b40c757 | 2009-03-18 13:03:32 -0700 | [diff] [blame] | 51 | set_pte_at(&init_mm, vaddr, pte, pteval); |
Jan Beulich | b0bfece | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 52 | else |
| 53 | pte_clear(&init_mm, vaddr, pte); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Christophe Lucas | f90e718 | 2005-06-25 14:59:24 -0700 | [diff] [blame] | 75 | printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | return; /* BUG(); */ |
| 77 | } |
| 78 | if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */ |
Christophe Lucas | f90e718 | 2005-06-25 14:59:24 -0700 | [diff] [blame] | 79 | printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | return; /* BUG(); */ |
| 81 | } |
| 82 | pgd = swapper_pg_dir + pgd_index(vaddr); |
| 83 | if (pgd_none(*pgd)) { |
Christophe Lucas | f90e718 | 2005-06-25 14:59:24 -0700 | [diff] [blame] | 84 | printk(KERN_WARNING "set_pmd_pfn: pgd_none\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jeremy Fitzhardinge | 052e799 | 2006-09-25 23:32:25 -0700 | [diff] [blame] | 97 | unsigned long __FIXADDR_TOP = 0xfffff000; |
| 98 | EXPORT_SYMBOL(__FIXADDR_TOP); |
Jeremy Fitzhardinge | 052e799 | 2006-09-25 23:32:25 -0700 | [diff] [blame] | 99 | |
Yinghai Lu | bef1568 | 2008-06-22 17:40:10 -0700 | [diff] [blame] | 100 | /* |
| 101 | * vmalloc=size forces the vmalloc area to be exactly 'size' |
| 102 | * bytes. This can be used to increase (or decrease) the |
| 103 | * vmalloc area - the default is 128m. |
| 104 | */ |
| 105 | static int __init parse_vmalloc(char *arg) |
| 106 | { |
| 107 | if (!arg) |
| 108 | return -EINVAL; |
| 109 | |
Dave Young | e621bd1 | 2008-08-20 16:43:03 -0700 | [diff] [blame] | 110 | /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ |
| 111 | __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; |
Yinghai Lu | bef1568 | 2008-06-22 17:40:10 -0700 | [diff] [blame] | 112 | return 0; |
| 113 | } |
| 114 | early_param("vmalloc", parse_vmalloc); |
| 115 | |
| 116 | /* |
| 117 | * reservetop=size reserves a hole at the top of the kernel address space which |
| 118 | * a hypervisor can load into later. Needed for dynamically loaded hypervisors, |
| 119 | * so relocating the fixmap can be done before paging initialization. |
| 120 | */ |
| 121 | static int __init parse_reservetop(char *arg) |
| 122 | { |
| 123 | unsigned long address; |
| 124 | |
| 125 | if (!arg) |
| 126 | return -EINVAL; |
| 127 | |
| 128 | address = memparse(arg, &arg); |
| 129 | reserve_top_address(address); |
Mark Salter | 5b7c73e | 2014-04-07 15:39:49 -0700 | [diff] [blame] | 130 | early_ioremap_init(); |
Yinghai Lu | bef1568 | 2008-06-22 17:40:10 -0700 | [diff] [blame] | 131 | return 0; |
| 132 | } |
| 133 | early_param("reservetop", parse_reservetop); |