pgtable_32.c revision 4f76cd382213b29dd3658e3e1ea47c0c2be06f3c 
1#include <linux/sched.h>
2#include <linux/kernel.h>
3#include <linux/errno.h>
4#include <linux/mm.h>
5#include <linux/nmi.h>
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>
12#include <linux/module.h>
13#include <linux/quicklist.h>
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;
31	unsigned long flags;
32
33	printk(KERN_INFO "Mem-info:\n");
34	show_free_areas();
35	for_each_online_pgdat(pgdat) {
36		pgdat_resize_lock(pgdat, &flags);
37		for (i = 0; i < pgdat->node_spanned_pages; ++i) {
38			if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
39				touch_nmi_watchdog();
40			page = pgdat_page_nr(pgdat, i);
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		}
51		pgdat_resize_unlock(pgdat, &flags);
52	}
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);
58
59	printk(KERN_INFO "%lu pages dirty\n", global_page_state(NR_FILE_DIRTY));
60	printk(KERN_INFO "%lu pages writeback\n",
61					global_page_state(NR_WRITEBACK));
62	printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
63	printk(KERN_INFO "%lu pages slab\n",
64		global_page_state(NR_SLAB_RECLAIMABLE) +
65		global_page_state(NR_SLAB_UNRECLAIMABLE));
66	printk(KERN_INFO "%lu pages pagetables\n",
67					global_page_state(NR_PAGETABLE));
68}
69
70/*
71 * Associate a virtual page frame with a given physical page frame
72 * and protection flags for that frame.
73 */
74static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
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);
97	if (pgprot_val(flags))
98		set_pte_present(&init_mm, vaddr, pte, pfn_pte(pfn, flags));
99	else
100		pte_clear(&init_mm, vaddr, pte);
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 */
122		printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n");
123		return; /* BUG(); */
124	}
125	if (pfn & (PTRS_PER_PTE-1)) {		/* pfn is misaligned */
126		printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n");
127		return; /* BUG(); */
128	}
129	pgd = swapper_pg_dir + pgd_index(vaddr);
130	if (pgd_none(*pgd)) {
131		printk(KERN_WARNING "set_pmd_pfn: pgd_none\n");
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
144static int fixmaps;
145unsigned long __FIXADDR_TOP = 0xfffff000;
146EXPORT_SYMBOL(__FIXADDR_TOP);
147
148void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
149{
150	unsigned long address = __fix_to_virt(idx);
151
152	if (idx >= __end_of_fixed_addresses) {
153		BUG();
154		return;
155	}
156	set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
157	fixmaps++;
158}
159
160/**
161 * reserve_top_address - reserves a hole in the top of kernel address space
162 * @reserve - size of hole to reserve
163 *
164 * Can be used to relocate the fixmap area and poke a hole in the top
165 * of kernel address space to make room for a hypervisor.
166 */
167void reserve_top_address(unsigned long reserve)
168{
169	BUG_ON(fixmaps > 0);
170	printk(KERN_INFO "Reserving virtual address space above 0x%08x\n",
171	       (int)-reserve);
172	__FIXADDR_TOP = -reserve - PAGE_SIZE;
173	__VMALLOC_RESERVE += reserve;
174}
175
176void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
177{
178	pgtable_page_dtor(pte);
179	paravirt_release_pt(page_to_pfn(pte));
180	tlb_remove_page(tlb, pte);
181}
182
183#ifdef CONFIG_X86_PAE
184
185void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
186{
187	paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
188	tlb_remove_page(tlb, virt_to_page(pmd));
189}
190
191#endif
192
193int pmd_bad(pmd_t pmd)
194{
195	WARN_ON_ONCE(pmd_bad_v1(pmd) != pmd_bad_v2(pmd));
196
197	return pmd_bad_v1(pmd);
198}
199