The bootm code needs to put the Kernel image and initrd into free
RAM. Add some functions to find free RAM chunks to help this code.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
common/memory.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/memory.h | 5 +++++
2 files changed, 56 insertions(+)
diff --git a/common/memory.c b/common/memory.c
index ff5bdc14e2..00fa7c50ff 100644
--- a/common/memory.c
+++ b/common/memory.c
@@ -171,6 +171,57 @@ int release_sdram_region(struct resource *res)
return release_region(res);
}
+void memory_bank_find_space(struct memory_bank *bank, resource_size_t *retstart,
+ resource_size_t *retend)
+{
+ resource_size_t freeptr, size, maxfree = 0;
+ struct resource *last, *child;
+
+ if (list_empty(&bank->res->children)) {
+ /* No children - return the whole bank */
+ *retstart = bank->res->start;
+ *retend = bank->res->end;
+ return;
+ }
+
+ freeptr = bank->res->start;
+
+ list_for_each_entry(child, &bank->res->children, sibling) {
+ /* Check gaps between child resources */
+ size = child->start - freeptr;
+ if (size > maxfree) {
+ *retstart = freeptr;
+ *retend = child->start - 1;
+ maxfree = size;
+ }
+ freeptr = child->start + resource_size(child);
+ }
+
+ last = list_last_entry(&bank->res->children, struct resource, sibling);
+
+ /* Check gap between last child and end of memory bank */
+ freeptr = last->start + resource_size(last);
+ size = bank->res->start + resource_size(bank->res) - freeptr;
+
+ if (size > maxfree) {
+ *retstart = freeptr;
+ *retend = bank->res->end;
+ }
+}
+
+int memory_bank_first_find_space(resource_size_t *retstart,
+ resource_size_t *retend)
+{
+ struct memory_bank *bank;
+
+ for_each_memory_bank(bank) {
+ memory_bank_find_space(bank, retstart, retend);
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
#ifdef CONFIG_OFTREE
static int of_memory_fixup(struct device_node *node, void *unused)
diff --git a/include/memory.h b/include/memory.h
index 165d2dc52a..56d16d20c8 100644
--- a/include/memory.h
+++ b/include/memory.h
@@ -27,4 +27,9 @@ struct resource *request_sdram_region(const char *name, resource_size_t start,
resource_size_t size);
int release_sdram_region(struct resource *res);
+void memory_bank_find_space(struct memory_bank *bank, resource_size_t *retstart,
+ resource_size_t *retend);
+int memory_bank_first_find_space(resource_size_t *retstart,
+ resource_size_t *retend);
+
#endif
--
2.16.1
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