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 <[EMAIL PROTECTED]>
---
lib_generic/lmb.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 49 insertions(+), 0 deletions(-)
diff --git a/lib_generic/lmb.c b/lib_generic/lmb.c
index 3b8c805..a34e2d3 100644
--- a/lib_generic/lmb.c
+++ b/lib_generic/lmb.c
@@ -180,6 +180,55 @@ long lmb_add(struct lmb *lmb, ulong base, ulong 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, ulong base, ulong size)
{
struct lmb_region *_rgn = &(lmb->reserved);
--
1.5.4.GIT
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