summaryrefslogtreecommitdiff
path: root/lib_generic/lmb.c
blob: 3b8c805e88132fadf1bf2540dc95200b479507f2 (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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
/*
 * Procedures for maintaining information about logical memory blocks.
 *
 * Peter Bergner, IBM Corp.	June 2001.
 * Copyright (C) 2001 Peter Bergner.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <common.h>
#include <lmb.h>

#define LMB_ALLOC_ANYWHERE	0

void lmb_dump_all(struct lmb *lmb)
{
#ifdef DEBUG
	unsigned long i;

	debug("lmb_dump_all:\n");
	debug("    memory.cnt		   = 0x%lx\n", lmb->memory.cnt);
	debug("    memory.size		   = 0x%08x\n", lmb->memory.size);
	for (i=0; i < lmb->memory.cnt ;i++) {
		debug("    memory.reg[0x%x].base   = 0x%08x\n", i,
			lmb->memory.region[i].base);
		debug("		   .size   = 0x%08x\n",
			lmb->memory.region[i].size);
	}

	debug("\n    reserved.cnt	   = 0x%lx\n", lmb->reserved.cnt);
	debug("    reserved.size	   = 0x%08x\n", lmb->reserved.size);
	for (i=0; i < lmb->reserved.cnt ;i++) {
		debug("    reserved.reg[0x%x].base = 0x%08x\n", i,
			lmb->reserved.region[i].base);
		debug("		     .size = 0x%08x\n",
			lmb->reserved.region[i].size);
	}
#endif /* DEBUG */
}

static unsigned long lmb_addrs_overlap(ulong base1,
		ulong size1, ulong base2, ulong size2)
{
	return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
}

static long lmb_addrs_adjacent(ulong base1, ulong size1,
		ulong base2, ulong size2)
{
	if (base2 == base1 + size1)
		return 1;
	else if (base1 == base2 + size2)
		return -1;

	return 0;
}

static long lmb_regions_adjacent(struct lmb_region *rgn,
		unsigned long r1, unsigned long r2)
{
	ulong base1 = rgn->region[r1].base;
	ulong size1 = rgn->region[r1].size;
	ulong base2 = rgn->region[r2].base;
	ulong size2 = rgn->region[r2].size;

	return lmb_addrs_adjacent(base1, size1, base2, size2);
}

static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
{
	unsigned long i;

	for (i = r; i < rgn->cnt - 1; i++) {
		rgn->region[i].base = rgn->region[i + 1].base;
		rgn->region[i].size = rgn->region[i + 1].size;
	}
	rgn->cnt--;
}

/* Assumption: base addr of region 1 < base addr of region 2 */
static void lmb_coalesce_regions(struct lmb_region *rgn,
		unsigned long r1, unsigned long r2)
{
	rgn->region[r1].size += rgn->region[r2].size;
	lmb_remove_region(rgn, r2);
}

void lmb_init(struct lmb *lmb)
{
	/* Create a dummy zero size LMB which will get coalesced away later.
	 * This simplifies the lmb_add() code below...
	 */
	lmb->memory.region[0].base = 0;
	lmb->memory.region[0].size = 0;
	lmb->memory.cnt = 1;
	lmb->memory.size = 0;

	/* Ditto. */
	lmb->reserved.region[0].base = 0;
	lmb->reserved.region[0].size = 0;
	lmb->reserved.cnt = 1;
	lmb->reserved.size = 0;
}

/* This routine called with relocation disabled. */
static long lmb_add_region(struct lmb_region *rgn, ulong base, ulong size)
{
	unsigned long coalesced = 0;
	long adjacent, i;

	if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
		rgn->region[0].base = base;
		rgn->region[0].size = size;
		return 0;
	}

	/* First try and coalesce this LMB with another. */
	for (i=0; i < rgn->cnt; i++) {
		ulong rgnbase = rgn->region[i].base;
		ulong rgnsize = rgn->region[i].size;

		if ((rgnbase == base) && (rgnsize == size))
			/* Already have this region, so we're done */
			return 0;

		adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
		if ( adjacent > 0 ) {
			rgn->region[i].base -= size;
			rgn->region[i].size += size;
			coalesced++;
			break;
		}
		else if ( adjacent < 0 ) {
			rgn->region[i].size += size;
			coalesced++;
			break;
		}
	}

	if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
		lmb_coalesce_regions(rgn, i, i+1);
		coalesced++;
	}

	if (coalesced)
		return coalesced;
	if (rgn->cnt >= MAX_LMB_REGIONS)
		return -1;

	/* Couldn't coalesce the LMB, so add it to the sorted table. */
	for (i = rgn->cnt-1; i >= 0; i--) {
		if (base < rgn->region[i].base) {
			rgn->region[i+1].base = rgn->region[i].base;
			rgn->region[i+1].size = rgn->region[i].size;
		} else {
			rgn->region[i+1].base = base;
			rgn->region[i+1].size = size;
			break;
		}
	}

	if (base < rgn->region[0].base) {
		rgn->region[0].base = base;
		rgn->region[0].size = size;
	}

	rgn->cnt++;

	return 0;
}

/* This routine may be called with relocation disabled. */
long lmb_add(struct lmb *lmb, ulong base, ulong size)
{
	struct lmb_region *_rgn = &(lmb->memory);

	return lmb_add_region(_rgn, base, size);
}

long lmb_reserve(struct lmb *lmb, ulong base, ulong size)
{
	struct lmb_region *_rgn = &(lmb->reserved);

	return lmb_add_region(_rgn, base, size);
}

long lmb_overlaps_region(struct lmb_region *rgn, ulong base,
				ulong size)
{
	unsigned long i;

	for (i=0; i < rgn->cnt; i++) {
		ulong rgnbase = rgn->region[i].base;
		ulong rgnsize = rgn->region[i].size;
		if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
			break;
		}
	}

	return (i < rgn->cnt) ? i : -1;
}

ulong lmb_alloc(struct lmb *lmb, ulong size, ulong align)
{
	return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
}

ulong lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
{
	ulong alloc;

	alloc = __lmb_alloc_base(lmb, size, align, max_addr);

	if (alloc == 0)
		printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
		      size, max_addr);

	return alloc;
}

static ulong lmb_align_down(ulong addr, ulong size)
{
	return addr & ~(size - 1);
}

static ulong lmb_align_up(ulong addr, ulong size)
{
	return (addr + (size - 1)) & ~(size - 1);
}

ulong __lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
{
	long i, j;
	ulong base = 0;

	for (i = lmb->memory.cnt-1; i >= 0; i--) {
		ulong lmbbase = lmb->memory.region[i].base;
		ulong lmbsize = lmb->memory.region[i].size;

		if (max_addr == LMB_ALLOC_ANYWHERE)
			base = lmb_align_down(lmbbase + lmbsize - size, align);
		else if (lmbbase < max_addr) {
			base = min(lmbbase + lmbsize, max_addr);
			base = lmb_align_down(base - size, align);
		} else
			continue;

		while ((lmbbase <= base) &&
		       ((j = lmb_overlaps_region(&(lmb->reserved), base, size)) >= 0) )
			base = lmb_align_down(lmb->reserved.region[j].base - size,
					      align);

		if ((base != 0) && (lmbbase <= base))
			break;
	}

	if (i < 0)
		return 0;

	if (lmb_add_region(&(lmb->reserved), base, lmb_align_up(size, align)) < 0)
		return 0;

	return base;
}

int lmb_is_reserved(struct lmb *lmb, ulong addr)
{
	int i;

	for (i = 0; i < lmb->reserved.cnt; i++) {
		ulong upper = lmb->reserved.region[i].base +
			lmb->reserved.region[i].size - 1;
		if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
			return 1;
	}
	return 0;
}