From 9d88a2eb6e05c07aa0d484b8fa1372722fa921d0 Mon Sep 17 00:00:00 2001 From: Badari Pulavarty Date: Fri, 18 Apr 2008 13:33:53 -0700 Subject: [POWERPC] Provide walk_memory_resource() for powerpc Provide walk_memory_resource() for 64-bit powerpc. PowerPC maintains logical memory region mapping in the lmb.memory structure. Walk through these structures and do the callbacks for the contiguous chunks. Signed-off-by: Badari Pulavarty Cc: Yasunori Goto Cc: Benjamin Herrenschmidt Signed-off-by: Andrew Morton Signed-off-by: Paul Mackerras --- lib/lmb.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'lib/lmb.c') diff --git a/lib/lmb.c b/lib/lmb.c index 5b2a739bc3d..83287d3869a 100644 --- a/lib/lmb.c +++ b/lib/lmb.c @@ -474,3 +474,36 @@ int __init lmb_is_reserved(u64 addr) } return 0; } + +/* + * Given a , find which memory regions belong to this range. + * Adjust the request and return a contiguous chunk. + */ +int lmb_find(struct lmb_property *res) +{ + int i; + u64 rstart, rend; + + rstart = res->base; + rend = rstart + res->size - 1; + + for (i = 0; i < lmb.memory.cnt; i++) { + u64 start = lmb.memory.region[i].base; + u64 end = start + lmb.memory.region[i].size - 1; + + if (start > rend) + return -1; + + if ((end >= rstart) && (start < rend)) { + /* adjust the request */ + if (rstart < start) + rstart = start; + if (rend > end) + rend = end; + res->base = rstart; + res->size = rend - rstart + 1; + return 0; + } + } + return -1; +} -- cgit v1.2.3