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.
15 #define LMB_ALLOC_ANYWHERE 0
17 void lmb_dump_all_force(struct lmb *lmb)
21 printf("lmb_dump_all:\n");
22 printf(" memory.cnt = 0x%lx\n", lmb->memory.cnt);
23 printf(" memory.size = 0x%llx\n",
24 (unsigned long long)lmb->memory.size);
25 for (i = 0; i < lmb->memory.cnt; i++) {
26 printf(" memory.reg[0x%lx].base = 0x%llx\n", i,
27 (unsigned long long)lmb->memory.region[i].base);
28 printf(" .size = 0x%llx\n",
29 (unsigned long long)lmb->memory.region[i].size);
32 printf("\n reserved.cnt = 0x%lx\n", lmb->reserved.cnt);
33 printf(" reserved.size = 0x%llx\n",
34 (unsigned long long)lmb->reserved.size);
35 for (i = 0; i < lmb->reserved.cnt; i++) {
36 printf(" reserved.reg[0x%lx].base = 0x%llx\n", i,
37 (unsigned long long)lmb->reserved.region[i].base);
38 printf(" .size = 0x%llx\n",
39 (unsigned long long)lmb->reserved.region[i].size);
43 void lmb_dump_all(struct lmb *lmb)
46 lmb_dump_all_force(lmb);
50 static long lmb_addrs_overlap(phys_addr_t base1, phys_size_t size1,
51 phys_addr_t base2, phys_size_t size2)
53 const phys_addr_t base1_end = base1 + size1 - 1;
54 const phys_addr_t base2_end = base2 + size2 - 1;
56 return ((base1 <= base2_end) && (base2 <= base1_end));
59 static long lmb_addrs_adjacent(phys_addr_t base1, phys_size_t size1,
60 phys_addr_t base2, phys_size_t size2)
62 if (base2 == base1 + size1)
64 else if (base1 == base2 + size2)
70 static long lmb_regions_adjacent(struct lmb_region *rgn, unsigned long r1,
73 phys_addr_t base1 = rgn->region[r1].base;
74 phys_size_t size1 = rgn->region[r1].size;
75 phys_addr_t base2 = rgn->region[r2].base;
76 phys_size_t size2 = rgn->region[r2].size;
78 return lmb_addrs_adjacent(base1, size1, base2, size2);
81 static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
85 for (i = r; i < rgn->cnt - 1; i++) {
86 rgn->region[i].base = rgn->region[i + 1].base;
87 rgn->region[i].size = rgn->region[i + 1].size;
92 /* Assumption: base addr of region 1 < base addr of region 2 */
93 static void lmb_coalesce_regions(struct lmb_region *rgn, unsigned long r1,
96 rgn->region[r1].size += rgn->region[r2].size;
97 lmb_remove_region(rgn, r2);
100 void lmb_init(struct lmb *lmb)
103 lmb->memory.size = 0;
104 lmb->reserved.cnt = 0;
105 lmb->reserved.size = 0;
108 static void lmb_reserve_common(struct lmb *lmb, void *fdt_blob)
110 arch_lmb_reserve(lmb);
111 board_lmb_reserve(lmb);
113 if (IMAGE_ENABLE_OF_LIBFDT && fdt_blob)
114 boot_fdt_add_mem_rsv_regions(lmb, fdt_blob);
117 /* Initialize the struct, add memory and call arch/board reserve functions */
118 void lmb_init_and_reserve(struct lmb *lmb, struct bd_info *bd, void *fdt_blob)
124 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
125 if (bd->bi_dram[i].size) {
126 lmb_add(lmb, bd->bi_dram[i].start,
127 bd->bi_dram[i].size);
131 lmb_reserve_common(lmb, fdt_blob);
134 /* Initialize the struct, add memory and call arch/board reserve functions */
135 void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
136 phys_size_t size, void *fdt_blob)
139 lmb_add(lmb, base, size);
140 lmb_reserve_common(lmb, fdt_blob);
143 /* This routine called with relocation disabled. */
144 static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size)
146 unsigned long coalesced = 0;
150 rgn->region[0].base = base;
151 rgn->region[0].size = size;
156 /* First try and coalesce this LMB with another. */
157 for (i = 0; i < rgn->cnt; i++) {
158 phys_addr_t rgnbase = rgn->region[i].base;
159 phys_size_t rgnsize = rgn->region[i].size;
161 if ((rgnbase == base) && (rgnsize == size))
162 /* Already have this region, so we're done */
165 adjacent = lmb_addrs_adjacent(base, size, rgnbase, rgnsize);
167 rgn->region[i].base -= size;
168 rgn->region[i].size += size;
171 } else if (adjacent < 0) {
172 rgn->region[i].size += size;
175 } else if (lmb_addrs_overlap(base, size, rgnbase, rgnsize)) {
176 /* regions overlap */
181 if ((i < rgn->cnt - 1) && lmb_regions_adjacent(rgn, i, i + 1)) {
182 lmb_coalesce_regions(rgn, i, i + 1);
188 if (rgn->cnt >= MAX_LMB_REGIONS)
191 /* Couldn't coalesce the LMB, so add it to the sorted table. */
192 for (i = rgn->cnt-1; i >= 0; i--) {
193 if (base < rgn->region[i].base) {
194 rgn->region[i + 1].base = rgn->region[i].base;
195 rgn->region[i + 1].size = rgn->region[i].size;
197 rgn->region[i + 1].base = base;
198 rgn->region[i + 1].size = size;
203 if (base < rgn->region[0].base) {
204 rgn->region[0].base = base;
205 rgn->region[0].size = size;
213 /* This routine may be called with relocation disabled. */
214 long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size)
216 struct lmb_region *_rgn = &(lmb->memory);
218 return lmb_add_region(_rgn, base, size);
221 long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size)
223 struct lmb_region *rgn = &(lmb->reserved);
224 phys_addr_t rgnbegin, rgnend;
225 phys_addr_t end = base + size - 1;
228 rgnbegin = rgnend = 0; /* supress gcc warnings */
230 /* Find the region where (base, size) belongs to */
231 for (i = 0; i < rgn->cnt; i++) {
232 rgnbegin = rgn->region[i].base;
233 rgnend = rgnbegin + rgn->region[i].size - 1;
235 if ((rgnbegin <= base) && (end <= rgnend))
239 /* Didn't find the region */
243 /* Check to see if we are removing entire region */
244 if ((rgnbegin == base) && (rgnend == end)) {
245 lmb_remove_region(rgn, i);
249 /* Check to see if region is matching at the front */
250 if (rgnbegin == base) {
251 rgn->region[i].base = end + 1;
252 rgn->region[i].size -= size;
256 /* Check to see if the region is matching at the end */
258 rgn->region[i].size -= size;
263 * We need to split the entry - adjust the current one to the
264 * beginging of the hole and add the region after hole.
266 rgn->region[i].size = base - rgn->region[i].base;
267 return lmb_add_region(rgn, end + 1, rgnend - end);
270 long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size)
272 struct lmb_region *_rgn = &(lmb->reserved);
274 return lmb_add_region(_rgn, base, size);
277 static long lmb_overlaps_region(struct lmb_region *rgn, phys_addr_t base,
282 for (i = 0; i < rgn->cnt; i++) {
283 phys_addr_t rgnbase = rgn->region[i].base;
284 phys_size_t rgnsize = rgn->region[i].size;
285 if (lmb_addrs_overlap(base, size, rgnbase, rgnsize))
289 return (i < rgn->cnt) ? i : -1;
292 phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align)
294 return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
297 phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
301 alloc = __lmb_alloc_base(lmb, size, align, max_addr);
304 printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
305 (ulong)size, (ulong)max_addr);
310 static phys_addr_t lmb_align_down(phys_addr_t addr, phys_size_t size)
312 return addr & ~(size - 1);
315 phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
318 phys_addr_t base = 0;
319 phys_addr_t res_base;
321 for (i = lmb->memory.cnt - 1; i >= 0; i--) {
322 phys_addr_t lmbbase = lmb->memory.region[i].base;
323 phys_size_t lmbsize = lmb->memory.region[i].size;
327 if (max_addr == LMB_ALLOC_ANYWHERE)
328 base = lmb_align_down(lmbbase + lmbsize - size, align);
329 else if (lmbbase < max_addr) {
330 base = lmbbase + lmbsize;
333 base = min(base, max_addr);
334 base = lmb_align_down(base - size, align);
338 while (base && lmbbase <= base) {
339 rgn = lmb_overlaps_region(&lmb->reserved, base, size);
341 /* This area isn't reserved, take it */
342 if (lmb_add_region(&lmb->reserved, base,
347 res_base = lmb->reserved.region[rgn].base;
350 base = lmb_align_down(res_base - size, align);
357 * Try to allocate a specific address range: must be in defined memory but not
360 phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base, phys_size_t size)
364 /* Check if the requested address is in one of the memory regions */
365 rgn = lmb_overlaps_region(&lmb->memory, base, size);
368 * Check if the requested end address is in the same memory
371 if (lmb_addrs_overlap(lmb->memory.region[rgn].base,
372 lmb->memory.region[rgn].size,
373 base + size - 1, 1)) {
374 /* ok, reserve the memory */
375 if (lmb_reserve(lmb, base, size) >= 0)
382 /* Return number of bytes from a given address that are free */
383 phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr)
388 /* check if the requested address is in the memory regions */
389 rgn = lmb_overlaps_region(&lmb->memory, addr, 1);
391 for (i = 0; i < lmb->reserved.cnt; i++) {
392 if (addr < lmb->reserved.region[i].base) {
393 /* first reserved range > requested address */
394 return lmb->reserved.region[i].base - addr;
396 if (lmb->reserved.region[i].base +
397 lmb->reserved.region[i].size > addr) {
398 /* requested addr is in this reserved range */
402 /* if we come here: no reserved ranges above requested addr */
403 return lmb->memory.region[lmb->memory.cnt - 1].base +
404 lmb->memory.region[lmb->memory.cnt - 1].size - addr;
409 int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr)
413 for (i = 0; i < lmb->reserved.cnt; i++) {
414 phys_addr_t upper = lmb->reserved.region[i].base +
415 lmb->reserved.region[i].size - 1;
416 if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
422 __weak void board_lmb_reserve(struct lmb *lmb)
424 /* please define platform specific board_lmb_reserve() */
427 __weak void arch_lmb_reserve(struct lmb *lmb)
429 /* please define platform specific arch_lmb_reserve() */