init.c 6.51 KB
Newer Older
1
2
/*
 * linux/arch/sh/mm/init.c
Linus Torvalds's avatar
Linus Torvalds committed
3
4
 *
 *  Copyright (C) 1999  Niibe Yutaka
5
 *  Copyright (C) 2002 - 2007  Paul Mundt
Linus Torvalds's avatar
Linus Torvalds committed
6
7
8
9
10
11
12
13
 *
 *  Based on linux/arch/i386/mm/init.c:
 *   Copyright (C) 1995  Linus Torvalds
 */
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
Paul Mundt's avatar
Paul Mundt committed
14
#include <linux/proc_fs.h>
15
#include <linux/pagemap.h>
16
17
#include <linux/percpu.h>
#include <linux/io.h>
Linus Torvalds's avatar
Linus Torvalds committed
18
19
20
21
22
23
24
25
26
27
28
29
30
#include <asm/mmu_context.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/cache.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];

void (*copy_page)(void *from, void *to);
void (*clear_page)(void *to);

void show_mem(void)
{
31
32
33
	int total = 0, reserved = 0, free = 0;
	int shared = 0, cached = 0, slab = 0;
	pg_data_t *pgdat;
Linus Torvalds's avatar
Linus Torvalds committed
34
35
36

	printk("Mem-info:\n");
	show_free_areas();
37
38

	for_each_online_pgdat(pgdat) {
Paul Mundt's avatar
Paul Mundt committed
39
		unsigned long flags, i;
40
41

		pgdat_resize_lock(pgdat, &flags);
Paul Mundt's avatar
Paul Mundt committed
42
43
		for (i = 0; i < pgdat->node_spanned_pages; i++) {
			struct page *page = pgdat_page_nr(pgdat, i);
44
45
46
47
48
49
50
51
52
53
54
			total++;
			if (PageReserved(page))
				reserved++;
			else if (PageSwapCache(page))
				cached++;
			else if (PageSlab(page))
				slab++;
			else if (!page_count(page))
				free++;
			else
				shared += page_count(page) - 1;
Paul Mundt's avatar
Paul Mundt committed
55
		}
56
		pgdat_resize_unlock(pgdat, &flags);
Linus Torvalds's avatar
Linus Torvalds committed
57
	}
58
59
60
61
62
63
64
65

	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
	printk("%d pages of RAM\n", total);
	printk("%d free pages\n", free);
	printk("%d reserved pages\n", reserved);
	printk("%d slab pages\n", slab);
	printk("%d pages shared\n", shared);
	printk("%d pages swap cached\n", cached);
Paul Mundt's avatar
Paul Mundt committed
66
67
	printk(KERN_INFO "Total of %ld pages in page table cache\n",
	       quicklist_total_size());
Linus Torvalds's avatar
Linus Torvalds committed
68
69
}

70
#ifdef CONFIG_MMU
Linus Torvalds's avatar
Linus Torvalds committed
71
72
73
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
{
	pgd_t *pgd;
74
	pud_t *pud;
Linus Torvalds's avatar
Linus Torvalds committed
75
76
77
	pmd_t *pmd;
	pte_t *pte;

Stuart Menefy's avatar
Stuart Menefy committed
78
	pgd = pgd_offset_k(addr);
Linus Torvalds's avatar
Linus Torvalds committed
79
80
81
82
83
	if (pgd_none(*pgd)) {
		pgd_ERROR(*pgd);
		return;
	}

Stuart Menefy's avatar
Stuart Menefy committed
84
85
86
87
	pud = pud_alloc(NULL, pgd, addr);
	if (unlikely(!pud)) {
		pud_ERROR(*pud);
		return;
88
89
	}

Stuart Menefy's avatar
Stuart Menefy committed
90
91
92
93
	pmd = pmd_alloc(NULL, pud, addr);
	if (unlikely(!pmd)) {
		pmd_ERROR(*pmd);
		return;
Linus Torvalds's avatar
Linus Torvalds committed
94
95
96
97
98
99
100
101
102
103
	}

	pte = pte_offset_kernel(pmd, addr);
	if (!pte_none(*pte)) {
		pte_ERROR(*pte);
		return;
	}

	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));

104
	flush_tlb_one(get_asid(), addr);
Linus Torvalds's avatar
Linus Torvalds committed
105
106
107
108
109
110
}

/*
 * As a performance optimization, other platforms preserve the fixmap mapping
 * across a context switch, we don't presently do this, but this could be done
 * in a similar fashion as to the wired TLB interface that sh64 uses (by way
Simon Arlott's avatar
Simon Arlott committed
111
 * of the memory mapped UTLB configuration) -- this unfortunately forces us to
Linus Torvalds's avatar
Linus Torvalds committed
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
 * give up a TLB entry for each mapping we want to preserve. While this may be
 * viable for a small number of fixmaps, it's not particularly useful for
 * everything and needs to be carefully evaluated. (ie, we may want this for
 * the vsyscall page).
 *
 * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
 * in at __set_fixmap() time to determine the appropriate behavior to follow.
 *
 *					 -- PFM.
 */
void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
{
	unsigned long address = __fix_to_virt(idx);

	if (idx >= __end_of_fixed_addresses) {
		BUG();
		return;
	}

	set_pte_phys(address, phys, prot);
}
133
#endif	/* CONFIG_MMU */
Linus Torvalds's avatar
Linus Torvalds committed
134
135
136
137
138
139
140
141
142
143
144

/* References to section boundaries */

extern char _text, _etext, _edata, __bss_start, _end;
extern char __init_begin, __init_end;

/*
 * paging_init() sets up the page tables
 */
void __init paging_init(void)
{
145
	int nid;
Linus Torvalds's avatar
Linus Torvalds committed
146

147
148
149
150
	/* We don't need to map the kernel through the TLB, as
	 * it is permanatly mapped using P1. So clear the
	 * entire pgd. */
	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
Linus Torvalds's avatar
Linus Torvalds committed
151

152
153
154
155
	/* Set an initial value for the MMU.TTB so we don't have to
	 * check for a null value. */
	set_TTB(swapper_pg_dir);

156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
	for_each_online_node(nid) {
		pg_data_t *pgdat = NODE_DATA(nid);
		unsigned long max_zone_pfns[MAX_NR_ZONES];
		unsigned long low, start_pfn;

		memset(max_zone_pfns, 0, sizeof(max_zone_pfns));

		start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
		low = pgdat->bdata->node_low_pfn;

		max_zone_pfns[ZONE_NORMAL] = low;

		printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
		       nid, start_pfn, low);

		free_area_init_nodes(max_zone_pfns);
	}
Linus Torvalds's avatar
Linus Torvalds committed
173
174
}

Paul Mundt's avatar
Paul Mundt committed
175
176
static struct kcore_list kcore_mem, kcore_vmalloc;

Linus Torvalds's avatar
Linus Torvalds committed
177
178
void __init mem_init(void)
{
Paul Mundt's avatar
Paul Mundt committed
179
	int codesize, datasize, initsize;
180
	int nid;
Linus Torvalds's avatar
Linus Torvalds committed
181

182
183
184
185
186
187
188
189
190
191
192
	for_each_online_node(nid) {
		pg_data_t *pgdat = NODE_DATA(nid);
		unsigned long node_pages = 0;
		void *node_high_memory;

		num_physpages += pgdat->node_present_pages;

		if (pgdat->node_spanned_pages)
			node_pages = free_all_bootmem_node(pgdat);

		totalram_pages += node_pages;
Linus Torvalds's avatar
Linus Torvalds committed
193

194
195
196
197
198
199
		node_high_memory = (void *)((pgdat->node_start_pfn +
					     pgdat->node_spanned_pages) <<
						PAGE_SHIFT);
		if (node_high_memory > high_memory)
			high_memory = node_high_memory;
	}
Linus Torvalds's avatar
Linus Torvalds committed
200
201
202
203
204

	/* clear the zero-page */
	memset(empty_zero_page, 0, PAGE_SIZE);
	__flush_wback_region(empty_zero_page, PAGE_SIZE);

205
	/*
Linus Torvalds's avatar
Linus Torvalds committed
206
207
208
	 * Setup wrappers for copy/clear_page(), these will get overridden
	 * later in the boot process if a better method is available.
	 */
Yoshinori Sato's avatar
Yoshinori Sato committed
209
#ifdef CONFIG_MMU
Linus Torvalds's avatar
Linus Torvalds committed
210
211
	copy_page = copy_page_slow;
	clear_page = clear_page_slow;
Yoshinori Sato's avatar
Yoshinori Sato committed
212
213
214
215
#else
	copy_page = copy_page_nommu;
	clear_page = clear_page_nommu;
#endif
Linus Torvalds's avatar
Linus Torvalds committed
216
217
218
219
220

	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

Paul Mundt's avatar
Paul Mundt committed
221
222
223
224
225
	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
		   VMALLOC_END - VMALLOC_START);

	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
Paul Mundt's avatar
Paul Mundt committed
226
	       "%dk data, %dk init)\n",
Linus Torvalds's avatar
Linus Torvalds committed
227
		(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
228
		totalram_pages << (PAGE_SHIFT-10),
Linus Torvalds's avatar
Linus Torvalds committed
229
230
231
232
233
		codesize >> 10,
		datasize >> 10,
		initsize >> 10);

	p3_cache_init();
234
235
236

	/* Initialize the vDSO */
	vsyscall_init();
Linus Torvalds's avatar
Linus Torvalds committed
237
238
239
240
241
}

void free_initmem(void)
{
	unsigned long addr;
242

Linus Torvalds's avatar
Linus Torvalds committed
243
244
245
	addr = (unsigned long)(&__init_begin);
	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
246
		init_page_count(virt_to_page(addr));
Linus Torvalds's avatar
Linus Torvalds committed
247
248
249
250
251
252
253
254
255
256
257
258
		free_page(addr);
		totalram_pages++;
	}
	printk ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	unsigned long p;
	for (p = start; p < end; p += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(p));
259
		init_page_count(virt_to_page(p));
Linus Torvalds's avatar
Linus Torvalds committed
260
261
262
263
264
265
		free_page(p);
		totalram_pages++;
	}
	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif