[PATCH kexec-tools v2 10/32] kexec: add generic helper to add to memory_regions

[Russell King]

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

Reviewed-by: Pratyush Anand <panand at redhat.com>
Signed-off-by: Russell King <rmk at arm.linux.org.uk>
---
 kexec/Makefile      |  4 ++++
 kexec/mem_regions.c | 30 ++++++++++++++++++++++++++++++
 kexec/mem_regions.h |  9 +++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 kexec/mem_regions.c
 create mode 100644 kexec/mem_regions.h

diff --git a/kexec/Makefile b/kexec/Makefile
index a758b4a..e2aee84 100644
--- a/kexec/Makefile
+++ b/kexec/Makefile
@@ -69,6 +69,10 @@ dist				+= kexec/fs2dt.c kexec/fs2dt.h
 $(ARCH)_FS2DT			=
 KEXEC_SRCS			+= $($(ARCH)_FS2DT)
 
+dist				+= kexec/mem_regions.c kexec/mem_regions.h
+$(ARCH)_MEM_REGIONS		=
+KEXEC_SRCS			+= $($(ARCH)_MEM_REGIONS)
+
 include $(srcdir)/kexec/arch/alpha/Makefile
 include $(srcdir)/kexec/arch/arm/Makefile
 include $(srcdir)/kexec/arch/i386/Makefile
diff --git a/kexec/mem_regions.c b/kexec/mem_regions.c
new file mode 100644
index 0000000..a4952ff
--- /dev/null
+++ b/kexec/mem_regions.c
@@ -0,0 +1,30 @@
+#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;
+}
+
diff --git a/kexec/mem_regions.h b/kexec/mem_regions.h
new file mode 100644
index 0000000..b9cfba1
--- /dev/null
+++ b/kexec/mem_regions.h
@@ -0,0 +1,9 @@
+#ifndef MEM_REGIONS_H
+#define MEM_REGIONS_H
+
+struct memory_ranges;
+
+int mem_regions_add(struct memory_ranges *ranges, unsigned long long base,
+                    unsigned long long length, int type);
+
+#endif
-- 
1.9.1