diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/lmb.c | 99 |
1 files changed, 90 insertions, 9 deletions
diff --git a/lib/lmb.c b/lib/lmb.c index 207147ab25e..83287d3869a 100644 --- a/lib/lmb.c +++ b/lib/lmb.c @@ -46,14 +46,13 @@ void lmb_dump_all(void) #endif /* DEBUG */ } -static unsigned long __init lmb_addrs_overlap(u64 base1, u64 size1, - u64 base2, u64 size2) +static unsigned long lmb_addrs_overlap(u64 base1, u64 size1, u64 base2, + u64 size2) { return ((base1 < (base2 + size2)) && (base2 < (base1 + size1))); } -static long __init lmb_addrs_adjacent(u64 base1, u64 size1, - u64 base2, u64 size2) +static long lmb_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2) { if (base2 == base1 + size1) return 1; @@ -63,7 +62,7 @@ static long __init lmb_addrs_adjacent(u64 base1, u64 size1, return 0; } -static long __init lmb_regions_adjacent(struct lmb_region *rgn, +static long lmb_regions_adjacent(struct lmb_region *rgn, unsigned long r1, unsigned long r2) { u64 base1 = rgn->region[r1].base; @@ -74,7 +73,7 @@ static long __init lmb_regions_adjacent(struct lmb_region *rgn, return lmb_addrs_adjacent(base1, size1, base2, size2); } -static void __init lmb_remove_region(struct lmb_region *rgn, unsigned long r) +static void lmb_remove_region(struct lmb_region *rgn, unsigned long r) { unsigned long i; @@ -86,7 +85,7 @@ static void __init lmb_remove_region(struct lmb_region *rgn, unsigned long r) } /* Assumption: base addr of region 1 < base addr of region 2 */ -static void __init lmb_coalesce_regions(struct lmb_region *rgn, +static void lmb_coalesce_regions(struct lmb_region *rgn, unsigned long r1, unsigned long r2) { rgn->region[r1].size += rgn->region[r2].size; @@ -118,7 +117,7 @@ void __init lmb_analyze(void) lmb.memory.size += lmb.memory.region[i].size; } -static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size) +static long lmb_add_region(struct lmb_region *rgn, u64 base, u64 size) { unsigned long coalesced = 0; long adjacent, i; @@ -182,7 +181,7 @@ static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size) return 0; } -long __init lmb_add(u64 base, u64 size) +long lmb_add(u64 base, u64 size) { struct lmb_region *_rgn = &lmb.memory; @@ -194,6 +193,55 @@ long __init lmb_add(u64 base, u64 size) } +long lmb_remove(u64 base, u64 size) +{ + struct lmb_region *rgn = &(lmb.memory); + 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 __init lmb_reserve(u64 base, u64 size) { struct lmb_region *_rgn = &lmb.reserved; @@ -426,3 +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; +} |