summaryrefslogtreecommitdiffstats
path: root/arch/xtensa/mm/init.c
blob: 4d658efc3289caad3c3e1d8eb18300fcdf36fd41 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/*
 * arch/xtensa/mm/init.c
 *
 * Derived from MIPS, PPC.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 *
 * Chris Zankel	<chris@zankel.net>
 * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
 * Marc Gauthier
 * Kevin Chea
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/bootmem.h>
#include <linux/gfp.h>
#include <linux/swap.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/mm.h>

#include <asm/bootparam.h>
#include <asm/page.h>
#include <asm/sections.h>

/*
 * mem_reserve(start, end, must_exist)
 *
 * Reserve some memory from the memory pool.
 *
 * Parameters:
 *  start	Start of region,
 *  end		End of region,
 *  must_exist	Must exist in memory pool.
 *
 * Returns:
 *  0 (memory area couldn't be mapped)
 * -1 (success)
 */

int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
{
	int i;

	if (start == end)
		return 0;

	start = start & PAGE_MASK;
	end = PAGE_ALIGN(end);

	for (i = 0; i < sysmem.nr_banks; i++)
		if (start < sysmem.bank[i].end
		    && end >= sysmem.bank[i].start)
			break;

	if (i == sysmem.nr_banks) {
		if (must_exist)
			printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) "
				"not in any region!\n", start, end);
		return 0;
	}

	if (start > sysmem.bank[i].start) {
		if (end < sysmem.bank[i].end) {
			/* split entry */
			if (sysmem.nr_banks >= SYSMEM_BANKS_MAX)
				panic("meminfo overflow\n");
			sysmem.bank[sysmem.nr_banks].start = end;
			sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end;
			sysmem.nr_banks++;
		}
		sysmem.bank[i].end = start;

	} else if (end < sysmem.bank[i].end) {
		sysmem.bank[i].start = end;

	} else {
		/* remove entry */
		sysmem.nr_banks--;
		sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start;
		sysmem.bank[i].end   = sysmem.bank[sysmem.nr_banks].end;
	}
	return -1;
}


/*
 * Initialize the bootmem system and give it all the memory we have available.
 */

void __init bootmem_init(void)
{
	unsigned long pfn;
	unsigned long bootmap_start, bootmap_size;
	int i;

	max_low_pfn = max_pfn = 0;
	min_low_pfn = ~0;

	for (i=0; i < sysmem.nr_banks; i++) {
		pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT;
		if (pfn < min_low_pfn)
			min_low_pfn = pfn;
		pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT;
		if (pfn > max_pfn)
			max_pfn = pfn;
	}

	if (min_low_pfn > max_pfn)
		panic("No memory found!\n");

	max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ?
		max_pfn : MAX_MEM_PFN >> PAGE_SHIFT;

	/* Find an area to use for the bootmem bitmap. */

	bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn);
	bootmap_size <<= PAGE_SHIFT;
	bootmap_start = ~0;

	for (i=0; i<sysmem.nr_banks; i++)
		if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) {
			bootmap_start = sysmem.bank[i].start;
			break;
		}

	if (bootmap_start == ~0UL)
		panic("Cannot find %ld bytes for bootmap\n", bootmap_size);

	/* Reserve the bootmem bitmap area */

	mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1);
	bootmap_size = init_bootmem_node(NODE_DATA(0),
					 bootmap_start >> PAGE_SHIFT,
					 min_low_pfn,
					 max_low_pfn);

	/* Add all remaining memory pieces into the bootmem map */

	for (i=0; i<sysmem.nr_banks; i++)
		free_bootmem(sysmem.bank[i].start,
			     sysmem.bank[i].end - sysmem.bank[i].start);

}


void __init zones_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES];
	int i;

	/* All pages are DMA-able, so we put them all in the DMA zone. */

	zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET;
	for (i = 1; i < MAX_NR_ZONES; i++)
		zones_size[i] = 0;

#ifdef CONFIG_HIGHMEM
	zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
#endif

	free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
}

/*
 * Initialize memory pages.
 */

void __init mem_init(void)
{
	unsigned long codesize, reservedpages, datasize, initsize;
	unsigned long highmemsize, tmp, ram;

	max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET;
	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	highmemsize = 0;

#ifdef CONFIG_HIGHMEM
#error HIGHGMEM not implemented in init.c
#endif

	totalram_pages += free_all_bootmem();

	reservedpages = ram = 0;
	for (tmp = 0; tmp < max_mapnr; tmp++) {
		ram++;
		if (PageReserved(mem_map+tmp))
			reservedpages++;
	}

	codesize =  (unsigned long) _etext - (unsigned long) _stext;
	datasize =  (unsigned long) _edata - (unsigned long) _sdata;
	initsize =  (unsigned long) __init_end - (unsigned long) __init_begin;

	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
	       "%ldk data, %ldk init %ldk highmem)\n",
	       nr_free_pages() << (PAGE_SHIFT-10),
	       ram << (PAGE_SHIFT-10),
	       codesize >> 10,
	       reservedpages << (PAGE_SHIFT-10),
	       datasize >> 10,
	       initsize >> 10,
	       highmemsize >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
extern int initrd_is_mapped;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (initrd_is_mapped)
		free_reserved_area((void *)start, (void *)end, 0, "initrd");
}
#endif

void free_initmem(void)
{
	free_initmem_default(0);
}
OpenPOWER on IntegriCloud