From 63796c4e61b207d2e635729d41b7a7f7d188b03c Mon Sep 17 00:00:00 2001 From: Andy Fleming Date: Mon, 16 Jun 2008 13:58:54 -0500 Subject: Add lmb_free 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 --- lib_generic/lmb.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'lib_generic') diff --git a/lib_generic/lmb.c b/lib_generic/lmb.c index afe33197de..3240f66bf9 100644 --- a/lib_generic/lmb.c +++ b/lib_generic/lmb.c @@ -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); -- cgit v1.2.1