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.
13 #define LMB_ALLOC_ANYWHERE 0
15 void lmb_dump_all(struct lmb *lmb)
20 debug("lmb_dump_all:\n");
21 debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt);
22 debug(" memory.size = 0x%llx\n",
23 (unsigned long long)lmb->memory.size);
24 for (i = 0; i < lmb->memory.cnt; i++) {
25 debug(" memory.reg[0x%lx].base = 0x%llx\n", i,
26 (unsigned long long)lmb->memory.region[i].base);
27 debug(" .size = 0x%llx\n",
28 (unsigned long long)lmb->memory.region[i].size);
31 debug("\n reserved.cnt = 0x%lx\n",
33 debug(" reserved.size = 0x%llx\n",
34 (unsigned long long)lmb->reserved.size);
35 for (i = 0; i < lmb->reserved.cnt; i++) {
36 debug(" reserved.reg[0x%lx].base = 0x%llx\n", i,
37 (unsigned long long)lmb->reserved.region[i].base);
38 debug(" .size = 0x%llx\n",
39 (unsigned long long)lmb->reserved.region[i].size);
44 static long lmb_addrs_overlap(phys_addr_t base1, phys_size_t size1,
45 phys_addr_t base2, phys_size_t size2)
47 const phys_addr_t base1_end = base1 + size1 - 1;
48 const phys_addr_t base2_end = base2 + size2 - 1;
50 return ((base1 <= base2_end) && (base2 <= base1_end));
53 static long lmb_addrs_adjacent(phys_addr_t base1, phys_size_t size1,
54 phys_addr_t base2, phys_size_t size2)
56 if (base2 == base1 + size1)
58 else if (base1 == base2 + size2)
64 static long lmb_regions_adjacent(struct lmb_region *rgn, unsigned long r1,
67 phys_addr_t base1 = rgn->region[r1].base;
68 phys_size_t size1 = rgn->region[r1].size;
69 phys_addr_t base2 = rgn->region[r2].base;
70 phys_size_t size2 = rgn->region[r2].size;
72 return lmb_addrs_adjacent(base1, size1, base2, size2);
75 static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
79 for (i = r; i < rgn->cnt - 1; i++) {
80 rgn->region[i].base = rgn->region[i + 1].base;
81 rgn->region[i].size = rgn->region[i + 1].size;
86 /* Assumption: base addr of region 1 < base addr of region 2 */
87 static void lmb_coalesce_regions(struct lmb_region *rgn, unsigned long r1,
90 rgn->region[r1].size += rgn->region[r2].size;
91 lmb_remove_region(rgn, r2);
94 void lmb_init(struct lmb *lmb)
98 lmb->reserved.cnt = 0;
99 lmb->reserved.size = 0;
102 static void lmb_reserve_common(struct lmb *lmb, void *fdt_blob)
104 arch_lmb_reserve(lmb);
105 board_lmb_reserve(lmb);
107 if (IMAGE_ENABLE_OF_LIBFDT && fdt_blob)
108 boot_fdt_add_mem_rsv_regions(lmb, fdt_blob);
111 /* Initialize the struct, add memory and call arch/board reserve functions */
112 void lmb_init_and_reserve(struct lmb *lmb, bd_t *bd, void *fdt_blob)
114 #ifdef CONFIG_NR_DRAM_BANKS
119 #ifdef CONFIG_NR_DRAM_BANKS
120 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
121 if (bd->bi_dram[i].size) {
122 lmb_add(lmb, bd->bi_dram[i].start,
123 bd->bi_dram[i].size);
128 lmb_add(lmb, bd->bi_memstart, bd->bi_memsize);
130 lmb_reserve_common(lmb, fdt_blob);
133 /* Initialize the struct, add memory and call arch/board reserve functions */
134 void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
135 phys_size_t size, void *fdt_blob)
138 lmb_add(lmb, base, size);
139 lmb_reserve_common(lmb, fdt_blob);
142 /* This routine called with relocation disabled. */
143 static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size)
145 unsigned long coalesced = 0;
149 rgn->region[0].base = base;
150 rgn->region[0].size = size;
155 /* First try and coalesce this LMB with another. */
156 for (i = 0; i < rgn->cnt; i++) {
157 phys_addr_t rgnbase = rgn->region[i].base;
158 phys_size_t rgnsize = rgn->region[i].size;
160 if ((rgnbase == base) && (rgnsize == size))
161 /* Already have this region, so we're done */
164 adjacent = lmb_addrs_adjacent(base, size, rgnbase, rgnsize);
166 rgn->region[i].base -= size;
167 rgn->region[i].size += size;
170 } else if (adjacent < 0) {
171 rgn->region[i].size += size;
174 } else if (lmb_addrs_overlap(base, size, rgnbase, rgnsize)) {
175 /* regions overlap */
180 if ((i < rgn->cnt - 1) && lmb_regions_adjacent(rgn, i, i + 1)) {
181 lmb_coalesce_regions(rgn, i, i + 1);
187 if (rgn->cnt >= MAX_LMB_REGIONS)
190 /* Couldn't coalesce the LMB, so add it to the sorted table. */
191 for (i = rgn->cnt-1; i >= 0; i--) {
192 if (base < rgn->region[i].base) {
193 rgn->region[i + 1].base = rgn->region[i].base;
194 rgn->region[i + 1].size = rgn->region[i].size;
196 rgn->region[i + 1].base = base;
197 rgn->region[i + 1].size = size;
202 if (base < rgn->region[0].base) {
203 rgn->region[0].base = base;
204 rgn->region[0].size = size;
212 /* This routine may be called with relocation disabled. */
213 long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size)
215 struct lmb_region *_rgn = &(lmb->memory);
217 return lmb_add_region(_rgn, base, size);
220 long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size)
222 struct lmb_region *rgn = &(lmb->reserved);
223 phys_addr_t rgnbegin, rgnend;
224 phys_addr_t end = base + size - 1;
227 rgnbegin = rgnend = 0; /* supress gcc warnings */
229 /* Find the region where (base, size) belongs to */
230 for (i = 0; i < rgn->cnt; i++) {
231 rgnbegin = rgn->region[i].base;
232 rgnend = rgnbegin + rgn->region[i].size - 1;
234 if ((rgnbegin <= base) && (end <= rgnend))
238 /* Didn't find the region */
242 /* Check to see if we are removing entire region */
243 if ((rgnbegin == base) && (rgnend == end)) {
244 lmb_remove_region(rgn, i);
248 /* Check to see if region is matching at the front */
249 if (rgnbegin == base) {
250 rgn->region[i].base = end + 1;
251 rgn->region[i].size -= size;
255 /* Check to see if the region is matching at the end */
257 rgn->region[i].size -= size;
262 * We need to split the entry - adjust the current one to the
263 * beginging of the hole and add the region after hole.
265 rgn->region[i].size = base - rgn->region[i].base;
266 return lmb_add_region(rgn, end + 1, rgnend - end);
269 long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size)
271 struct lmb_region *_rgn = &(lmb->reserved);
273 return lmb_add_region(_rgn, base, size);
276 static long lmb_overlaps_region(struct lmb_region *rgn, phys_addr_t base,
281 for (i = 0; i < rgn->cnt; i++) {
282 phys_addr_t rgnbase = rgn->region[i].base;
283 phys_size_t rgnsize = rgn->region[i].size;
284 if (lmb_addrs_overlap(base, size, rgnbase, rgnsize))
288 return (i < rgn->cnt) ? i : -1;
291 phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align)
293 return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
296 phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
300 alloc = __lmb_alloc_base(lmb, size, align, max_addr);
303 printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
304 (ulong)size, (ulong)max_addr);
309 static phys_addr_t lmb_align_down(phys_addr_t addr, phys_size_t size)
311 return addr & ~(size - 1);
314 phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
317 phys_addr_t base = 0;
318 phys_addr_t res_base;
320 for (i = lmb->memory.cnt - 1; i >= 0; i--) {
321 phys_addr_t lmbbase = lmb->memory.region[i].base;
322 phys_size_t lmbsize = lmb->memory.region[i].size;
326 if (max_addr == LMB_ALLOC_ANYWHERE)
327 base = lmb_align_down(lmbbase + lmbsize - size, align);
328 else if (lmbbase < max_addr) {
329 base = lmbbase + lmbsize;
332 base = min(base, max_addr);
333 base = lmb_align_down(base - size, align);
337 while (base && lmbbase <= base) {
338 rgn = lmb_overlaps_region(&lmb->reserved, base, size);
340 /* This area isn't reserved, take it */
341 if (lmb_add_region(&lmb->reserved, base,
346 res_base = lmb->reserved.region[rgn].base;
349 base = lmb_align_down(res_base - size, align);
356 * Try to allocate a specific address range: must be in defined memory but not
359 phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base, phys_size_t size)
363 /* Check if the requested address is in one of the memory regions */
364 rgn = lmb_overlaps_region(&lmb->memory, base, size);
367 * Check if the requested end address is in the same memory
370 if (lmb_addrs_overlap(lmb->memory.region[rgn].base,
371 lmb->memory.region[rgn].size,
372 base + size - 1, 1)) {
373 /* ok, reserve the memory */
374 if (lmb_reserve(lmb, base, size) >= 0)
381 /* Return number of bytes from a given address that are free */
382 phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr)
387 /* check if the requested address is in the memory regions */
388 rgn = lmb_overlaps_region(&lmb->memory, addr, 1);
390 for (i = 0; i < lmb->reserved.cnt; i++) {
391 if (addr < lmb->reserved.region[i].base) {
392 /* first reserved range > requested address */
393 return lmb->reserved.region[i].base - addr;
395 if (lmb->reserved.region[i].base +
396 lmb->reserved.region[i].size > addr) {
397 /* requested addr is in this reserved range */
401 /* if we come here: no reserved ranges above requested addr */
402 return lmb->memory.region[lmb->memory.cnt - 1].base +
403 lmb->memory.region[lmb->memory.cnt - 1].size - addr;
408 int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr)
412 for (i = 0; i < lmb->reserved.cnt; i++) {
413 phys_addr_t upper = lmb->reserved.region[i].base +
414 lmb->reserved.region[i].size - 1;
415 if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
421 __weak void board_lmb_reserve(struct lmb *lmb)
423 /* please define platform specific board_lmb_reserve() */
426 __weak void arch_lmb_reserve(struct lmb *lmb)
428 /* please define platform specific arch_lmb_reserve() */