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Add lmb_free

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lmb_free allows us to unreserve some memory so we can use lmb_alloc_base or
lmb_reserve to temporarily reserve some memory.

Signed-off-by: Andy Fleming <afleming@freescale.com>
This commit is contained in:
Andy Fleming 2008-06-16 13:58:54 -05:00 committed by Wolfgang Denk
parent 4b03ac8b51
commit 63796c4e61
1 changed files with 49 additions and 0 deletions
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49
lib_generic/lmb.c
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@ -181,6 +181,55 @@ long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size)
return lmb_add_region(_rgn, base, size);
}
long lmb_free(struct lmb *lmb, u64 base, u64 size)
{
struct lmb_region *rgn = &(lmb->reserved);
u64 rgnbegin, rgnend;
u64 end = base + size;
int i;
rgnbegin = rgnend = 0; /* supress gcc warnings */
/* Find the region where (base, size) belongs to */
for (i=0; i < rgn->cnt; i++) {
rgnbegin = rgn->region[i].base;
rgnend = rgnbegin + rgn->region[i].size;
if ((rgnbegin <= base) && (end <= rgnend))
break;
}
/* Didn't find the region */
if (i == rgn->cnt)
return -1;
/* Check to see if we are removing entire region */
if ((rgnbegin == base) && (rgnend == end)) {
lmb_remove_region(rgn, i);
return 0;
}
/* Check to see if region is matching at the front */
if (rgnbegin == base) {
rgn->region[i].base = end;
rgn->region[i].size -= size;
return 0;
}
/* Check to see if the region is matching at the end */
if (rgnend == end) {
rgn->region[i].size -= size;
return 0;
}
/*
* We need to split the entry - adjust the current one to the
* beginging of the hole and add the region after hole.
*/
rgn->region[i].size = base - rgn->region[i].base;
return lmb_add_region(rgn, end, rgnend - end);
}
long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size)
{
struct lmb_region *_rgn = &(lmb->reserved);