kexec: add generic helper to add to memory_regions

Add a helper to add a memory range to a memory_regions array.

Reviewed-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 29 insertions, 0 deletions

diff --git a/kexec/mem_regions.c b/kexec/mem_regions.c
new file mode 100644
index 0000000..4425b86
--- /dev/null
+++ b/kexec/mem_regions.c
@@ -0,0 +1,29 @@
+#include "kexec.h"
+#include "mem_regions.h"
+
+/**
+ * mem_regions_add() - add a memory region to a set of ranges
+ * @ranges: ranges to add the memory region to
+ * @max: maximum number of entries in memory region
+ * @base: base address of memory region
+ * @length: length of memory region in bytes
+ * @type: type of memory region
+ *
+ * Add the memory region to the set of ranges, and return %0 if successful,
+ * or %-1 if we ran out of space.
+ */
+int mem_regions_add(struct memory_ranges *ranges, unsigned long long base,
+                    unsigned long long length, int type)
+{
+	struct memory_range *range;
+
+	if (ranges->size >= ranges->max_size)
+		return -1;
+
+	range = ranges->ranges + ranges->size++;
+	range->start = base;
+	range->end = base + length - 1;
+	range->type = type;
+
+	return 0;
+}