blob: 9adce776852be885cff56c59b07cec98b64f4dde [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/sched.h>
2#include <linux/kernel.h>
3#include <linux/errno.h>
4#include <linux/mm.h>
Prarit Bhargava27eb0b22007-10-17 18:04:34 +02005#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/swap.h>
7#include <linux/smp.h>
8#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/pagemap.h>
10#include <linux/spinlock.h>
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <asm/pgtable.h>
13#include <asm/pgalloc.h>
14#include <asm/fixmap.h>
15#include <asm/e820.h>
16#include <asm/tlb.h>
17#include <asm/tlbflush.h>
Ingo Molnar56f0e742010-05-03 09:19:43 +020018#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Pekka Enberg2b688df2009-03-03 12:55:04 +020020unsigned int __VMALLOC_RESERVE = 128 << 20;
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022/*
23 * Associate a virtual page frame with a given physical page frame
24 * and protection flags for that frame.
25 */
Jeremy Fitzhardinged494a962008-06-17 11:41:59 -070026void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
Linus Torvalds1da177e2005-04-16 15:20:36 -070027{
28 pgd_t *pgd;
29 pud_t *pud;
30 pmd_t *pmd;
31 pte_t *pte;
32
33 pgd = swapper_pg_dir + pgd_index(vaddr);
34 if (pgd_none(*pgd)) {
35 BUG();
36 return;
37 }
38 pud = pud_offset(pgd, vaddr);
39 if (pud_none(*pud)) {
40 BUG();
41 return;
42 }
43 pmd = pmd_offset(pud, vaddr);
44 if (pmd_none(*pmd)) {
45 BUG();
46 return;
47 }
48 pte = pte_offset_kernel(pmd, vaddr);
Dave Hansendcb32d92016-07-07 17:19:15 -070049 if (!pte_none(pteval))
Jeremy Fitzhardingeb40c7572009-03-18 13:03:32 -070050 set_pte_at(&init_mm, vaddr, pte, pteval);
Jan Beulichb0bfece2006-12-07 02:14:09 +010051 else
52 pte_clear(&init_mm, vaddr, pte);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54 /*
55 * It's enough to flush this one mapping.
56 * (PGE mappings get flushed as well)
57 */
58 __flush_tlb_one(vaddr);
59}
60
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -070061unsigned long __FIXADDR_TOP = 0xfffff000;
62EXPORT_SYMBOL(__FIXADDR_TOP);
Jeremy Fitzhardinge052e7992006-09-25 23:32:25 -070063
Yinghai Lubef15682008-06-22 17:40:10 -070064/*
65 * vmalloc=size forces the vmalloc area to be exactly 'size'
66 * bytes. This can be used to increase (or decrease) the
67 * vmalloc area - the default is 128m.
68 */
69static int __init parse_vmalloc(char *arg)
70{
71 if (!arg)
72 return -EINVAL;
73
Dave Younge621bd12008-08-20 16:43:03 -070074 /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
75 __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
Yinghai Lubef15682008-06-22 17:40:10 -070076 return 0;
77}
78early_param("vmalloc", parse_vmalloc);
79
80/*
81 * reservetop=size reserves a hole at the top of the kernel address space which
82 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
83 * so relocating the fixmap can be done before paging initialization.
84 */
85static int __init parse_reservetop(char *arg)
86{
87 unsigned long address;
88
89 if (!arg)
90 return -EINVAL;
91
92 address = memparse(arg, &arg);
93 reserve_top_address(address);
Mark Salter5b7c73e2014-04-07 15:39:49 -070094 early_ioremap_init();
Yinghai Lubef15682008-06-22 17:40:10 -070095 return 0;
96}
97early_param("reservetop", parse_reservetop);