diff options
Diffstat (limited to 'kernel/resource.c')
| -rw-r--r-- | kernel/resource.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 9bd14fd3e6d..a358142ff48 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -234,7 +234,7 @@ EXPORT_SYMBOL(release_resource); * the caller must specify res->start, res->end, res->flags. * If found, returns 0, res is overwritten, if not found, returns -1. */ -int find_next_system_ram(struct resource *res) +static int find_next_system_ram(struct resource *res) { resource_size_t start, end; struct resource *p; @@ -267,6 +267,30 @@ int find_next_system_ram(struct resource *res) res->end = p->end; return 0; } +int +walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, + int (*func)(unsigned long, unsigned long, void *)) +{ + struct resource res; + unsigned long pfn, len; + u64 orig_end; + int ret = -1; + res.start = (u64) start_pfn << PAGE_SHIFT; + res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1; + res.flags = IORESOURCE_MEM; + orig_end = res.end; + while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) { + pfn = (unsigned long)(res.start >> PAGE_SHIFT); + len = (unsigned long)((res.end + 1 - res.start) >> PAGE_SHIFT); + ret = (*func)(pfn, len, arg); + if (ret) + break; + res.start = res.end + 1; + res.end = orig_end; + } + return ret; +} + #endif /* |