1 // SPDX-License-Identifier: GPL-2.0+
3 * Procedures for maintaining information about logical memory blocks.
5 * Peter Bergner, IBM Corp. June 2001.
6 * Copyright (C) 2001 Peter Bergner.
12 #define LMB_ALLOC_ANYWHERE 0
14 void lmb_dump_all(struct lmb *lmb)
19 debug("lmb_dump_all:\n");
20 debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt);
21 debug(" memory.size = 0x%llx\n",
22 (unsigned long long)lmb->memory.size);
23 for (i=0; i < lmb->memory.cnt ;i++) {
24 debug(" memory.reg[0x%lx].base = 0x%llx\n", i,
25 (long long unsigned)lmb->memory.region[i].base);
26 debug(" .size = 0x%llx\n",
27 (long long unsigned)lmb->memory.region[i].size);
30 debug("\n reserved.cnt = 0x%lx\n",
32 debug(" reserved.size = 0x%llx\n",
33 (long long unsigned)lmb->reserved.size);
34 for (i=0; i < lmb->reserved.cnt ;i++) {
35 debug(" reserved.reg[0x%lx].base = 0x%llx\n", i,
36 (long long unsigned)lmb->reserved.region[i].base);
37 debug(" .size = 0x%llx\n",
38 (long long unsigned)lmb->reserved.region[i].size);
43 static long lmb_addrs_overlap(phys_addr_t base1,
44 phys_size_t size1, phys_addr_t base2, phys_size_t size2)
46 return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
49 static long lmb_addrs_adjacent(phys_addr_t base1, phys_size_t size1,
50 phys_addr_t base2, phys_size_t size2)
52 if (base2 == base1 + size1)
54 else if (base1 == base2 + size2)
60 static long lmb_regions_adjacent(struct lmb_region *rgn,
61 unsigned long r1, unsigned long r2)
63 phys_addr_t base1 = rgn->region[r1].base;
64 phys_size_t size1 = rgn->region[r1].size;
65 phys_addr_t base2 = rgn->region[r2].base;
66 phys_size_t size2 = rgn->region[r2].size;
68 return lmb_addrs_adjacent(base1, size1, base2, size2);
71 static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
75 for (i = r; i < rgn->cnt - 1; i++) {
76 rgn->region[i].base = rgn->region[i + 1].base;
77 rgn->region[i].size = rgn->region[i + 1].size;
82 /* Assumption: base addr of region 1 < base addr of region 2 */
83 static void lmb_coalesce_regions(struct lmb_region *rgn,
84 unsigned long r1, unsigned long r2)
86 rgn->region[r1].size += rgn->region[r2].size;
87 lmb_remove_region(rgn, r2);
90 void lmb_init(struct lmb *lmb)
92 /* Create a dummy zero size LMB which will get coalesced away later.
93 * This simplifies the lmb_add() code below...
95 lmb->memory.region[0].base = 0;
96 lmb->memory.region[0].size = 0;
101 lmb->reserved.region[0].base = 0;
102 lmb->reserved.region[0].size = 0;
103 lmb->reserved.cnt = 1;
104 lmb->reserved.size = 0;
107 /* This routine called with relocation disabled. */
108 static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size)
110 unsigned long coalesced = 0;
113 if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
114 rgn->region[0].base = base;
115 rgn->region[0].size = size;
119 /* First try and coalesce this LMB with another. */
120 for (i=0; i < rgn->cnt; i++) {
121 phys_addr_t rgnbase = rgn->region[i].base;
122 phys_size_t rgnsize = rgn->region[i].size;
124 if ((rgnbase == base) && (rgnsize == size))
125 /* Already have this region, so we're done */
128 adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
129 if ( adjacent > 0 ) {
130 rgn->region[i].base -= size;
131 rgn->region[i].size += size;
135 else if ( adjacent < 0 ) {
136 rgn->region[i].size += size;
142 if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
143 lmb_coalesce_regions(rgn, i, i+1);
149 if (rgn->cnt >= MAX_LMB_REGIONS)
152 /* Couldn't coalesce the LMB, so add it to the sorted table. */
153 for (i = rgn->cnt-1; i >= 0; i--) {
154 if (base < rgn->region[i].base) {
155 rgn->region[i+1].base = rgn->region[i].base;
156 rgn->region[i+1].size = rgn->region[i].size;
158 rgn->region[i+1].base = base;
159 rgn->region[i+1].size = size;
164 if (base < rgn->region[0].base) {
165 rgn->region[0].base = base;
166 rgn->region[0].size = size;
174 /* This routine may be called with relocation disabled. */
175 long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size)
177 struct lmb_region *_rgn = &(lmb->memory);
179 return lmb_add_region(_rgn, base, size);
182 long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size)
184 struct lmb_region *rgn = &(lmb->reserved);
185 phys_addr_t rgnbegin, rgnend;
186 phys_addr_t end = base + size;
189 rgnbegin = rgnend = 0; /* supress gcc warnings */
191 /* Find the region where (base, size) belongs to */
192 for (i=0; i < rgn->cnt; i++) {
193 rgnbegin = rgn->region[i].base;
194 rgnend = rgnbegin + rgn->region[i].size;
196 if ((rgnbegin <= base) && (end <= rgnend))
200 /* Didn't find the region */
204 /* Check to see if we are removing entire region */
205 if ((rgnbegin == base) && (rgnend == end)) {
206 lmb_remove_region(rgn, i);
210 /* Check to see if region is matching at the front */
211 if (rgnbegin == base) {
212 rgn->region[i].base = end;
213 rgn->region[i].size -= size;
217 /* Check to see if the region is matching at the end */
219 rgn->region[i].size -= size;
224 * We need to split the entry - adjust the current one to the
225 * beginging of the hole and add the region after hole.
227 rgn->region[i].size = base - rgn->region[i].base;
228 return lmb_add_region(rgn, end, rgnend - end);
231 long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size)
233 struct lmb_region *_rgn = &(lmb->reserved);
235 return lmb_add_region(_rgn, base, size);
238 static long lmb_overlaps_region(struct lmb_region *rgn, phys_addr_t base,
243 for (i=0; i < rgn->cnt; i++) {
244 phys_addr_t rgnbase = rgn->region[i].base;
245 phys_size_t rgnsize = rgn->region[i].size;
246 if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
251 return (i < rgn->cnt) ? i : -1;
254 phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align)
256 return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
259 phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
263 alloc = __lmb_alloc_base(lmb, size, align, max_addr);
266 printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
267 (ulong)size, (ulong)max_addr);
272 static phys_addr_t lmb_align_down(phys_addr_t addr, phys_size_t size)
274 return addr & ~(size - 1);
277 static phys_addr_t lmb_align_up(phys_addr_t addr, ulong size)
279 return (addr + (size - 1)) & ~(size - 1);
282 phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
285 phys_addr_t base = 0;
286 phys_addr_t res_base;
288 for (i = lmb->memory.cnt-1; i >= 0; i--) {
289 phys_addr_t lmbbase = lmb->memory.region[i].base;
290 phys_size_t lmbsize = lmb->memory.region[i].size;
294 if (max_addr == LMB_ALLOC_ANYWHERE)
295 base = lmb_align_down(lmbbase + lmbsize - size, align);
296 else if (lmbbase < max_addr) {
297 base = lmbbase + lmbsize;
300 base = min(base, max_addr);
301 base = lmb_align_down(base - size, align);
305 while (base && lmbbase <= base) {
306 j = lmb_overlaps_region(&lmb->reserved, base, size);
308 /* This area isn't reserved, take it */
309 if (lmb_add_region(&lmb->reserved, base,
315 res_base = lmb->reserved.region[j].base;
318 base = lmb_align_down(res_base - size, align);
324 int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr)
328 for (i = 0; i < lmb->reserved.cnt; i++) {
329 phys_addr_t upper = lmb->reserved.region[i].base +
330 lmb->reserved.region[i].size - 1;
331 if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
337 __weak void board_lmb_reserve(struct lmb *lmb)
339 /* please define platform specific board_lmb_reserve() */
342 __weak void arch_lmb_reserve(struct lmb *lmb)
344 /* please define platform specific arch_lmb_reserve() */