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author | Badari Pulavarty <pbadari@us.ibm.com> | 2008-04-18 13:33:53 -0700 |
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committer | Paul Mackerras <paulus@samba.org> | 2008-04-29 15:57:53 +1000 |
commit | 9d88a2eb6e05c07aa0d484b8fa1372722fa921d0 (patch) | |
tree | 782b288099fbd96ed779c033f2c1322ff1822950 /lib/lmb.c | |
parent | 98d5c21c812e4e3b795f5bd912f407ed7c5e4e38 (diff) | |
download | linux-9d88a2eb6e05c07aa0d484b8fa1372722fa921d0.tar.gz linux-9d88a2eb6e05c07aa0d484b8fa1372722fa921d0.tar.bz2 linux-9d88a2eb6e05c07aa0d484b8fa1372722fa921d0.zip |
[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 <pbadari@us.ibm.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'lib/lmb.c')
-rw-r--r-- | lib/lmb.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/lib/lmb.c b/lib/lmb.c index 5b2a739bc3d5..83287d3869a3 100644 --- a/lib/lmb.c +++ b/lib/lmb.c @@ -474,3 +474,36 @@ int __init lmb_is_reserved(u64 addr) } return 0; } + +/* + * Given a <base, len>, 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; +} |