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diff --git a/kernel_call/platform_match.h b/kernel_call/platform_match.h
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+/*
+ * platform_match.h
+ * Brandon Azad
+ */
+#ifndef VOUCHER_SWAP__PLATFORM_MATCH_H_
+#define VOUCHER_SWAP__PLATFORM_MATCH_H_
+
+#include <stdbool.h>
+
+/*
+ * platform_matches_device
+ *
+ * Description:
+ * 	Check whether the current platform matches the specified device or range of devices.
+ *
+ * Match format:
+ * 	The match string may either specify a single device glob or a range of device globs. For
+ * 	example:
+ *
+ * 	"iPhone11,8"		Matches only iPhone11,8
+ * 	"iPhone11,*"		Matches all iPhone11 devices, including e.g. iPhone11,4.
+ * 	"iPhone*,*"		Matches all iPhone devices.
+ * 	"iPhone11,4-iPhone11,8"	Matches all iPhone devices between 11,4 and 11,8, inclusive.
+ * 	"iPhone10,*-11,*"	Matches all iPhone10 and iPhone11 devices.
+ *
+ * 	As a special case, "*" matches all devices.
+ */
+bool platform_matches_device(const char *device_range);
+
+/*
+ * platform_matches_build
+ *
+ * Description:
+ * 	Check whether the current platform matches the specified build version or range of build
+ * 	versions.
+ *
+ * Match format:
+ * 	The match string may either specify a single build version or a range of build versions.
+ * 	For example:
+ *
+ * 	"16C50"			Matches only build 16C50.
+ * 	"16B92-16C50"		Matches all builds between 16B92 and 16C50, inclusive.
+ *
+ * 	As a special case, either build version may be replaced with "*" to indicate a lack of
+ * 	lower or upper bound:
+ *
+ * 	"*-16B92"		Matches all builds up to and including 16B92.
+ * 	"16C50-*"		Matches build 16C50 and later.
+ * 	"*"			Matches all build versions.
+ */
+bool platform_matches_build(const char *build_range);
+
+/*
+ * platform_matches
+ *
+ * Description:
+ * 	A convenience function that combines platform_matches_device() and
+ * 	platform_matches_build().
+ */
+bool platform_matches(const char *device_range, const char *build_range);
+
+#endif