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337 lines
8.2 KiB
C
337 lines
8.2 KiB
C
/*
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* Procedures for maintaining information about logical memory blocks.
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*
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* Peter Bergner, IBM Corp. June 2001.
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* Copyright (C) 2001 Peter Bergner.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <common.h>
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#include <lmb.h>
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#define LMB_ALLOC_ANYWHERE 0
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void lmb_dump_all(struct lmb *lmb)
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{
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#ifdef DEBUG
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unsigned long i;
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debug("lmb_dump_all:\n");
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debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt);
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debug(" memory.size = 0x%llx\n",
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(unsigned long long)lmb->memory.size);
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for (i=0; i < lmb->memory.cnt ;i++) {
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debug(" memory.reg[0x%lx].base = 0x%llx\n", i,
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(long long unsigned)lmb->memory.region[i].base);
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debug(" .size = 0x%llx\n",
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(long long unsigned)lmb->memory.region[i].size);
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}
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debug("\n reserved.cnt = 0x%lx\n",
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lmb->reserved.cnt);
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debug(" reserved.size = 0x%llx\n",
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(long long unsigned)lmb->reserved.size);
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for (i=0; i < lmb->reserved.cnt ;i++) {
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debug(" reserved.reg[0x%lx].base = 0x%llx\n", i,
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(long long unsigned)lmb->reserved.region[i].base);
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debug(" .size = 0x%llx\n",
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(long long unsigned)lmb->reserved.region[i].size);
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}
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#endif /* DEBUG */
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}
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static long lmb_addrs_overlap(phys_addr_t base1,
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phys_size_t size1, phys_addr_t base2, phys_size_t size2)
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{
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return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
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}
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static long lmb_addrs_adjacent(phys_addr_t base1, phys_size_t size1,
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phys_addr_t base2, phys_size_t size2)
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{
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if (base2 == base1 + size1)
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return 1;
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else if (base1 == base2 + size2)
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return -1;
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return 0;
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}
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static long lmb_regions_adjacent(struct lmb_region *rgn,
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unsigned long r1, unsigned long r2)
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{
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phys_addr_t base1 = rgn->region[r1].base;
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phys_size_t size1 = rgn->region[r1].size;
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phys_addr_t base2 = rgn->region[r2].base;
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phys_size_t size2 = rgn->region[r2].size;
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return lmb_addrs_adjacent(base1, size1, base2, size2);
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}
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static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
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{
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unsigned long i;
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for (i = r; i < rgn->cnt - 1; i++) {
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rgn->region[i].base = rgn->region[i + 1].base;
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rgn->region[i].size = rgn->region[i + 1].size;
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}
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rgn->cnt--;
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}
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/* Assumption: base addr of region 1 < base addr of region 2 */
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static void lmb_coalesce_regions(struct lmb_region *rgn,
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unsigned long r1, unsigned long r2)
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{
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rgn->region[r1].size += rgn->region[r2].size;
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lmb_remove_region(rgn, r2);
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}
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void lmb_init(struct lmb *lmb)
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{
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/* Create a dummy zero size LMB which will get coalesced away later.
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* This simplifies the lmb_add() code below...
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*/
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lmb->memory.region[0].base = 0;
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lmb->memory.region[0].size = 0;
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lmb->memory.cnt = 1;
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lmb->memory.size = 0;
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/* Ditto. */
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lmb->reserved.region[0].base = 0;
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lmb->reserved.region[0].size = 0;
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lmb->reserved.cnt = 1;
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lmb->reserved.size = 0;
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}
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/* This routine called with relocation disabled. */
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static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size)
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{
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unsigned long coalesced = 0;
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long adjacent, i;
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if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
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rgn->region[0].base = base;
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rgn->region[0].size = size;
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return 0;
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}
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/* First try and coalesce this LMB with another. */
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for (i=0; i < rgn->cnt; i++) {
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phys_addr_t rgnbase = rgn->region[i].base;
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phys_size_t rgnsize = rgn->region[i].size;
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if ((rgnbase == base) && (rgnsize == size))
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/* Already have this region, so we're done */
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return 0;
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adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
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if ( adjacent > 0 ) {
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rgn->region[i].base -= size;
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rgn->region[i].size += size;
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coalesced++;
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break;
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}
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else if ( adjacent < 0 ) {
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rgn->region[i].size += size;
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coalesced++;
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break;
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}
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}
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if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
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lmb_coalesce_regions(rgn, i, i+1);
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coalesced++;
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}
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if (coalesced)
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return coalesced;
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if (rgn->cnt >= MAX_LMB_REGIONS)
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return -1;
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/* Couldn't coalesce the LMB, so add it to the sorted table. */
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for (i = rgn->cnt-1; i >= 0; i--) {
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if (base < rgn->region[i].base) {
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rgn->region[i+1].base = rgn->region[i].base;
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rgn->region[i+1].size = rgn->region[i].size;
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} else {
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rgn->region[i+1].base = base;
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rgn->region[i+1].size = size;
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break;
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}
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}
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if (base < rgn->region[0].base) {
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rgn->region[0].base = base;
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rgn->region[0].size = size;
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}
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rgn->cnt++;
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return 0;
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}
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/* This routine may be called with relocation disabled. */
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long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size)
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{
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struct lmb_region *_rgn = &(lmb->memory);
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return lmb_add_region(_rgn, base, size);
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}
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long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size)
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{
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struct lmb_region *rgn = &(lmb->reserved);
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phys_addr_t rgnbegin, rgnend;
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phys_addr_t end = base + size;
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int i;
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rgnbegin = rgnend = 0; /* supress gcc warnings */
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/* Find the region where (base, size) belongs to */
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for (i=0; i < rgn->cnt; i++) {
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rgnbegin = rgn->region[i].base;
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rgnend = rgnbegin + rgn->region[i].size;
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if ((rgnbegin <= base) && (end <= rgnend))
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break;
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}
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/* Didn't find the region */
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if (i == rgn->cnt)
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return -1;
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/* Check to see if we are removing entire region */
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if ((rgnbegin == base) && (rgnend == end)) {
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lmb_remove_region(rgn, i);
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return 0;
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}
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/* Check to see if region is matching at the front */
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if (rgnbegin == base) {
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rgn->region[i].base = end;
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rgn->region[i].size -= size;
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return 0;
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}
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/* Check to see if the region is matching at the end */
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if (rgnend == end) {
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rgn->region[i].size -= size;
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return 0;
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}
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/*
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* We need to split the entry - adjust the current one to the
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* beginging of the hole and add the region after hole.
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*/
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rgn->region[i].size = base - rgn->region[i].base;
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return lmb_add_region(rgn, end, rgnend - end);
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}
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long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size)
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{
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struct lmb_region *_rgn = &(lmb->reserved);
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return lmb_add_region(_rgn, base, size);
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}
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long lmb_overlaps_region(struct lmb_region *rgn, phys_addr_t base,
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phys_size_t size)
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{
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unsigned long i;
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for (i=0; i < rgn->cnt; i++) {
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phys_addr_t rgnbase = rgn->region[i].base;
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phys_size_t rgnsize = rgn->region[i].size;
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if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
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break;
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}
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}
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return (i < rgn->cnt) ? i : -1;
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}
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phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align)
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{
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return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
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}
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phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
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{
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phys_addr_t alloc;
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alloc = __lmb_alloc_base(lmb, size, align, max_addr);
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if (alloc == 0)
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printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
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(ulong)size, (ulong)max_addr);
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return alloc;
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}
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static phys_addr_t lmb_align_down(phys_addr_t addr, phys_size_t size)
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{
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return addr & ~(size - 1);
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}
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static phys_addr_t lmb_align_up(phys_addr_t addr, ulong size)
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{
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return (addr + (size - 1)) & ~(size - 1);
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}
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phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr)
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{
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long i, j;
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phys_addr_t base = 0;
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phys_addr_t res_base;
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for (i = lmb->memory.cnt-1; i >= 0; i--) {
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phys_addr_t lmbbase = lmb->memory.region[i].base;
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phys_size_t lmbsize = lmb->memory.region[i].size;
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if (lmbsize < size)
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continue;
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if (max_addr == LMB_ALLOC_ANYWHERE)
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base = lmb_align_down(lmbbase + lmbsize - size, align);
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else if (lmbbase < max_addr) {
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base = min(lmbbase + lmbsize, max_addr);
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base = lmb_align_down(base - size, align);
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} else
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continue;
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while (base && lmbbase <= base) {
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j = lmb_overlaps_region(&lmb->reserved, base, size);
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if (j < 0) {
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/* This area isn't reserved, take it */
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if (lmb_add_region(&lmb->reserved, base,
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lmb_align_up(size,
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align)) < 0)
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return 0;
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return base;
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}
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res_base = lmb->reserved.region[j].base;
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if (res_base < size)
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break;
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base = lmb_align_down(res_base - size, align);
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}
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}
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return 0;
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}
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int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr)
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{
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int i;
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for (i = 0; i < lmb->reserved.cnt; i++) {
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phys_addr_t upper = lmb->reserved.region[i].base +
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lmb->reserved.region[i].size - 1;
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if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
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return 1;
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}
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return 0;
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}
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