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x86: move find_max_low_pfn to init_32.c
[mirror_ubuntu-artful-kernel.git] / arch / x86 / mm / pgtable_32.c
CommitLineData
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>
9#include <linux/slab.h>
10#include <linux/pagemap.h>
11#include <linux/spinlock.h>
052e7994 12#include <linux/module.h>
f1d1a842 13#include <linux/quicklist.h>
1da177e4
LT
14
15#include <asm/system.h>
16#include <asm/pgtable.h>
17#include <asm/pgalloc.h>
18#include <asm/fixmap.h>
19#include <asm/e820.h>
20#include <asm/tlb.h>
21#include <asm/tlbflush.h>
22
23void show_mem(void)
24{
25 int total = 0, reserved = 0;
26 int shared = 0, cached = 0;
27 int highmem = 0;
28 struct page *page;
29 pg_data_t *pgdat;
30 unsigned long i;
208d54e5 31 unsigned long flags;
1da177e4 32
f90e7185 33 printk(KERN_INFO "Mem-info:\n");
1da177e4 34 show_free_areas();
ec936fc5 35 for_each_online_pgdat(pgdat) {
208d54e5 36 pgdat_resize_lock(pgdat, &flags);
1da177e4 37 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
27eb0b28
PB
38 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
39 touch_nmi_watchdog();
408fde81 40 page = pgdat_page_nr(pgdat, i);
1da177e4
LT
41 total++;
42 if (PageHighMem(page))
43 highmem++;
44 if (PageReserved(page))
45 reserved++;
46 else if (PageSwapCache(page))
47 cached++;
48 else if (page_count(page))
49 shared += page_count(page) - 1;
50 }
208d54e5 51 pgdat_resize_unlock(pgdat, &flags);
1da177e4 52 }
f90e7185
CL
53 printk(KERN_INFO "%d pages of RAM\n", total);
54 printk(KERN_INFO "%d pages of HIGHMEM\n", highmem);
55 printk(KERN_INFO "%d reserved pages\n", reserved);
56 printk(KERN_INFO "%d pages shared\n", shared);
57 printk(KERN_INFO "%d pages swap cached\n", cached);
6f4e1e50 58
b1e7a8fd 59 printk(KERN_INFO "%lu pages dirty\n", global_page_state(NR_FILE_DIRTY));
ce866b34
CL
60 printk(KERN_INFO "%lu pages writeback\n",
61 global_page_state(NR_WRITEBACK));
65ba55f5 62 printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
972d1a7b
CL
63 printk(KERN_INFO "%lu pages slab\n",
64 global_page_state(NR_SLAB_RECLAIMABLE) +
65 global_page_state(NR_SLAB_UNRECLAIMABLE));
df849a15
CL
66 printk(KERN_INFO "%lu pages pagetables\n",
67 global_page_state(NR_PAGETABLE));
1da177e4
LT
68}
69
70/*
71 * Associate a virtual page frame with a given physical page frame
72 * and protection flags for that frame.
73 */
d494a961 74void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
1da177e4
LT
75{
76 pgd_t *pgd;
77 pud_t *pud;
78 pmd_t *pmd;
79 pte_t *pte;
80
81 pgd = swapper_pg_dir + pgd_index(vaddr);
82 if (pgd_none(*pgd)) {
83 BUG();
84 return;
85 }
86 pud = pud_offset(pgd, vaddr);
87 if (pud_none(*pud)) {
88 BUG();
89 return;
90 }
91 pmd = pmd_offset(pud, vaddr);
92 if (pmd_none(*pmd)) {
93 BUG();
94 return;
95 }
96 pte = pte_offset_kernel(pmd, vaddr);
d494a961
JF
97 if (pte_val(pteval))
98 set_pte_present(&init_mm, vaddr, pte, pteval);
b0bfece4
JB
99 else
100 pte_clear(&init_mm, vaddr, pte);
1da177e4
LT
101
102 /*
103 * It's enough to flush this one mapping.
104 * (PGE mappings get flushed as well)
105 */
106 __flush_tlb_one(vaddr);
107}
108
109/*
110 * Associate a large virtual page frame with a given physical page frame
111 * and protection flags for that frame. pfn is for the base of the page,
112 * vaddr is what the page gets mapped to - both must be properly aligned.
113 * The pmd must already be instantiated. Assumes PAE mode.
114 */
115void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
116{
117 pgd_t *pgd;
118 pud_t *pud;
119 pmd_t *pmd;
120
121 if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */
f90e7185 122 printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n");
1da177e4
LT
123 return; /* BUG(); */
124 }
125 if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */
f90e7185 126 printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n");
1da177e4
LT
127 return; /* BUG(); */
128 }
129 pgd = swapper_pg_dir + pgd_index(vaddr);
130 if (pgd_none(*pgd)) {
f90e7185 131 printk(KERN_WARNING "set_pmd_pfn: pgd_none\n");
1da177e4
LT
132 return; /* BUG(); */
133 }
134 pud = pud_offset(pgd, vaddr);
135 pmd = pmd_offset(pud, vaddr);
136 set_pmd(pmd, pfn_pmd(pfn, flags));
137 /*
138 * It's enough to flush this one mapping.
139 * (PGE mappings get flushed as well)
140 */
141 __flush_tlb_one(vaddr);
142}
143
052e7994 144static int fixmaps;
052e7994
JF
145unsigned long __FIXADDR_TOP = 0xfffff000;
146EXPORT_SYMBOL(__FIXADDR_TOP);
052e7994 147
052e7994
JF
148/**
149 * reserve_top_address - reserves a hole in the top of kernel address space
150 * @reserve - size of hole to reserve
151 *
152 * Can be used to relocate the fixmap area and poke a hole in the top
153 * of kernel address space to make room for a hypervisor.
154 */
155void reserve_top_address(unsigned long reserve)
156{
7c7e6e07 157 BUG_ON(fixmaps_set > 0);
7ce0bcfd
ZA
158 printk(KERN_INFO "Reserving virtual address space above 0x%08x\n",
159 (int)-reserve);
052e7994
JF
160 __FIXADDR_TOP = -reserve - PAGE_SIZE;
161 __VMALLOC_RESERVE += reserve;
1da177e4 162}