diff --git a/include/efi_api.h b/include/efi_api.h
index 5ab78baeea0..e0991b6eca5 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -51,13 +51,15 @@ struct efi_boot_services {
 	efi_status_t (EFIAPI *raise_tpl)(efi_uintn_t new_tpl);
 	void (EFIAPI *restore_tpl)(efi_uintn_t old_tpl);
 
-	efi_status_t (EFIAPI *allocate_pages)(int, int, unsigned long,
+	efi_status_t (EFIAPI *allocate_pages)(int, int, efi_uintn_t,
 					      efi_physical_addr_t *);
-	efi_status_t (EFIAPI *free_pages)(efi_physical_addr_t, unsigned long);
-	efi_status_t (EFIAPI *get_memory_map)(unsigned long *memory_map_size,
-			struct efi_mem_desc *desc, unsigned long *key,
-			unsigned long *desc_size, u32 *desc_version);
-	efi_status_t (EFIAPI *allocate_pool)(int, unsigned long, void **);
+	efi_status_t (EFIAPI *free_pages)(efi_physical_addr_t, efi_uintn_t);
+	efi_status_t (EFIAPI *get_memory_map)(efi_uintn_t *memory_map_size,
+					      struct efi_mem_desc *desc,
+					      efi_uintn_t *key,
+					      efi_uintn_t *desc_size,
+					      u32 *desc_version);
+	efi_status_t (EFIAPI *allocate_pool)(int, efi_uintn_t, void **);
 	efi_status_t (EFIAPI *free_pool)(void *);
 
 	efi_status_t (EFIAPI *create_event)(uint32_t type,
@@ -69,8 +71,9 @@ struct efi_boot_services {
 	efi_status_t (EFIAPI *set_timer)(struct efi_event *event,
 					 enum efi_timer_delay type,
 					 uint64_t trigger_time);
-	efi_status_t (EFIAPI *wait_for_event)(unsigned long number_of_events,
-			struct efi_event **event, size_t *index);
+	efi_status_t (EFIAPI *wait_for_event)(efi_uintn_t number_of_events,
+					      struct efi_event **event,
+					      efi_uintn_t *index);
 	efi_status_t (EFIAPI *signal_event)(struct efi_event *event);
 	efi_status_t (EFIAPI *close_event)(struct efi_event *event);
 	efi_status_t (EFIAPI *check_event)(struct efi_event *event);
@@ -93,7 +96,7 @@ struct efi_boot_services {
 	efi_status_t (EFIAPI *locate_handle)(
 			enum efi_locate_search_type search_type,
 			const efi_guid_t *protocol, void *search_key,
-			unsigned long *buffer_size, efi_handle_t *buffer);
+			efi_uintn_t *buffer_size, efi_handle_t *buffer);
 	efi_status_t (EFIAPI *locate_device_path)(const efi_guid_t *protocol,
 			struct efi_device_path **device_path,
 			efi_handle_t *device);
@@ -140,14 +143,14 @@ struct efi_boot_services {
 	efi_status_t(EFIAPI *open_protocol_information)(efi_handle_t handle,
 			const efi_guid_t *protocol,
 			struct efi_open_protocol_info_entry **entry_buffer,
-			unsigned long *entry_count);
+			efi_uintn_t *entry_count);
 	efi_status_t (EFIAPI *protocols_per_handle)(efi_handle_t handle,
 			efi_guid_t ***protocol_buffer,
-			unsigned long *protocols_buffer_count);
+			efi_uintn_t *protocols_buffer_count);
 	efi_status_t (EFIAPI *locate_handle_buffer) (
 			enum efi_locate_search_type search_type,
 			const efi_guid_t *protocol, void *search_key,
-			unsigned long *no_handles, efi_handle_t **buffer);
+			efi_uintn_t *no_handles, efi_handle_t **buffer);
 	efi_status_t (EFIAPI *locate_protocol)(const efi_guid_t *protocol,
 			void *registration, void **protocol_interface);
 	efi_status_t (EFIAPI *install_multiple_protocol_interfaces)(
@@ -248,7 +251,7 @@ struct efi_system_table {
 	struct efi_simple_text_output_protocol *std_err;
 	struct efi_runtime_services *runtime;
 	struct efi_boot_services *boottime;
-	unsigned long nr_tables;
+	efi_uintn_t nr_tables;
 	struct efi_configuration_table *tables;
 };
 
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 83b27d04490..e3d1c359301 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -215,20 +215,20 @@ struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
 /* Generic EFI memory allocator, call this to get memory */
 void *efi_alloc(uint64_t len, int memory_type);
 /* More specific EFI memory allocator, called by EFI payloads */
-efi_status_t efi_allocate_pages(int type, int memory_type, unsigned long pages,
+efi_status_t efi_allocate_pages(int type, int memory_type, efi_uintn_t pages,
 				uint64_t *memory);
 /* EFI memory free function. */
-efi_status_t efi_free_pages(uint64_t memory, unsigned long pages);
+efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages);
 /* EFI memory allocator for small allocations */
-efi_status_t efi_allocate_pool(int pool_type, unsigned long size,
+efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size,
 			       void **buffer);
 /* EFI pool memory free function. */
 efi_status_t efi_free_pool(void *buffer);
 /* Returns the EFI memory map */
-efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
+efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
 				struct efi_mem_desc *memory_map,
-				unsigned long *map_key,
-				unsigned long *descriptor_size,
+				efi_uintn_t *map_key,
+				efi_uintn_t *descriptor_size,
 				uint32_t *descriptor_version);
 /* Adds a range into the EFI memory map */
 uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 9523267156c..5bf26114a1b 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -217,12 +217,12 @@ static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl)
  * @return		status code
  */
 static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
-						  unsigned long pages,
+						  efi_uintn_t pages,
 						  uint64_t *memory)
 {
 	efi_status_t r;
 
-	EFI_ENTRY("%d, %d, 0x%lx, %p", type, memory_type, pages, memory);
+	EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory);
 	r = efi_allocate_pages(type, memory_type, pages, memory);
 	return EFI_EXIT(r);
 }
@@ -239,11 +239,11 @@ static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
  * @return	status code
  */
 static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
-					      unsigned long pages)
+					      efi_uintn_t pages)
 {
 	efi_status_t r;
 
-	EFI_ENTRY("%"PRIx64", 0x%lx", memory, pages);
+	EFI_ENTRY("%"PRIx64", 0x%zx", memory, pages);
 	r = efi_free_pages(memory, pages);
 	return EFI_EXIT(r);
 }
@@ -264,10 +264,10 @@ static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
  * @return		status code
  */
 static efi_status_t EFIAPI efi_get_memory_map_ext(
-					unsigned long *memory_map_size,
+					efi_uintn_t *memory_map_size,
 					struct efi_mem_desc *memory_map,
-					unsigned long *map_key,
-					unsigned long *descriptor_size,
+					efi_uintn_t *map_key,
+					efi_uintn_t *descriptor_size,
 					uint32_t *descriptor_version)
 {
 	efi_status_t r;
@@ -292,12 +292,12 @@ static efi_status_t EFIAPI efi_get_memory_map_ext(
  * @return	status code
  */
 static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type,
-						 unsigned long size,
+						 efi_uintn_t size,
 						 void **buffer)
 {
 	efi_status_t r;
 
-	EFI_ENTRY("%d, %ld, %p", pool_type, size, buffer);
+	EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer);
 	r = efi_allocate_pool(pool_type, size, buffer);
 	return EFI_EXIT(r);
 }
@@ -539,13 +539,13 @@ static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
  * @index	index of the event that was signaled
  * @return	status code
  */
-static efi_status_t EFIAPI efi_wait_for_event(unsigned long num_events,
+static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
 					      struct efi_event **event,
-					      size_t *index)
+					      efi_uintn_t *index)
 {
 	int i, j;
 
-	EFI_ENTRY("%ld, %p, %p", num_events, event, index);
+	EFI_ENTRY("%zd, %p, %p", num_events, event, index);
 
 	/* Check parameters */
 	if (!num_events || !event)
@@ -925,10 +925,10 @@ static int efi_search(enum efi_locate_search_type search_type,
 static efi_status_t efi_locate_handle(
 			enum efi_locate_search_type search_type,
 			const efi_guid_t *protocol, void *search_key,
-			unsigned long *buffer_size, efi_handle_t *buffer)
+			efi_uintn_t *buffer_size, efi_handle_t *buffer)
 {
 	struct list_head *lhandle;
-	unsigned long size = 0;
+	efi_uintn_t size = 0;
 
 	/* Count how much space we need */
 	list_for_each(lhandle, &efi_obj_list) {
@@ -977,7 +977,7 @@ static efi_status_t efi_locate_handle(
 static efi_status_t EFIAPI efi_locate_handle_ext(
 			enum efi_locate_search_type search_type,
 			const efi_guid_t *protocol, void *search_key,
-			unsigned long *buffer_size, efi_handle_t *buffer)
+			efi_uintn_t *buffer_size, efi_handle_t *buffer)
 {
 	EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
 		  buffer_size, buffer);
@@ -1548,7 +1548,7 @@ static efi_status_t EFIAPI efi_close_protocol(void *handle,
 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
 			const efi_guid_t *protocol,
 			struct efi_open_protocol_info_entry **entry_buffer,
-			unsigned long *entry_count)
+			efi_uintn_t *entry_count)
 {
 	EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
 		  entry_count);
@@ -1569,7 +1569,7 @@ static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
  */
 static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
 			efi_guid_t ***protocol_buffer,
-			unsigned long *protocol_buffer_count)
+			efi_uintn_t *protocol_buffer_count)
 {
 	unsigned long buffer_size;
 	struct efi_object *efiobj;
@@ -1637,10 +1637,10 @@ static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
 static efi_status_t EFIAPI efi_locate_handle_buffer(
 			enum efi_locate_search_type search_type,
 			const efi_guid_t *protocol, void *search_key,
-			unsigned long *no_handles, efi_handle_t **buffer)
+			efi_uintn_t *no_handles, efi_handle_t **buffer)
 {
 	efi_status_t r;
-	unsigned long buffer_size = 0;
+	efi_uintn_t buffer_size = 0;
 
 	EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
 		  no_handles, buffer);
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index d47759e08ed..0aa3e0881d4 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -276,7 +276,7 @@ static uint64_t efi_find_free_memory(uint64_t len, uint64_t max_addr)
 }
 
 efi_status_t efi_allocate_pages(int type, int memory_type,
-				unsigned long pages, uint64_t *memory)
+				efi_uintn_t pages, uint64_t *memory)
 {
 	u64 len = pages << EFI_PAGE_SHIFT;
 	efi_status_t r = EFI_SUCCESS;
@@ -338,7 +338,7 @@ void *efi_alloc(uint64_t len, int memory_type)
 	return NULL;
 }
 
-efi_status_t efi_free_pages(uint64_t memory, unsigned long pages)
+efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
 {
 	uint64_t r = 0;
 
@@ -351,7 +351,7 @@ efi_status_t efi_free_pages(uint64_t memory, unsigned long pages)
 	return EFI_NOT_FOUND;
 }
 
-efi_status_t efi_allocate_pool(int pool_type, unsigned long size,
+efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size,
 			       void **buffer)
 {
 	efi_status_t r;
@@ -392,16 +392,16 @@ efi_status_t efi_free_pool(void *buffer)
 	return r;
 }
 
-efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
-			       struct efi_mem_desc *memory_map,
-			       unsigned long *map_key,
-			       unsigned long *descriptor_size,
-			       uint32_t *descriptor_version)
+efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
+				struct efi_mem_desc *memory_map,
+				efi_uintn_t *map_key,
+				efi_uintn_t *descriptor_size,
+				uint32_t *descriptor_version)
 {
-	ulong map_size = 0;
+	efi_uintn_t map_size = 0;
 	int map_entries = 0;
 	struct list_head *lhandle;
-	unsigned long provided_map_size = *memory_map_size;
+	efi_uintn_t provided_map_size = *memory_map_size;
 
 	list_for_each(lhandle, &efi_mem)
 		map_entries++;
diff --git a/lib/efi_selftest/efi_selftest.c b/lib/efi_selftest/efi_selftest.c
index b6bc4dd5c07..263b53f6724 100644
--- a/lib/efi_selftest/efi_selftest.c
+++ b/lib/efi_selftest/efi_selftest.c
@@ -32,9 +32,9 @@ static u16 reset_message[] = L"Selftest completed";
  */
 void efi_st_exit_boot_services(void)
 {
-	unsigned long map_size = 0;
-	unsigned long map_key;
-	unsigned long desc_size;
+	efi_uintn_t map_size = 0;
+	efi_uintn_t map_key;
+	efi_uintn_t desc_size;
 	u32 desc_version;
 	efi_status_t ret;
 	struct efi_mem_desc *memory_map;
diff --git a/lib/efi_selftest/efi_selftest_events.c b/lib/efi_selftest/efi_selftest_events.c
index 081f31257fb..ad9490bd250 100644
--- a/lib/efi_selftest/efi_selftest_events.c
+++ b/lib/efi_selftest/efi_selftest_events.c
@@ -108,7 +108,7 @@ static int teardown(void)
  */
 static int execute(void)
 {
-	size_t index;
+	efi_uintn_t index;
 	efi_status_t ret;
 
 	/* Set 10 ms timer */
diff --git a/lib/efi_selftest/efi_selftest_manageprotocols.c b/lib/efi_selftest/efi_selftest_manageprotocols.c
index e978dd7f2fd..f20f1528d47 100644
--- a/lib/efi_selftest/efi_selftest_manageprotocols.c
+++ b/lib/efi_selftest/efi_selftest_manageprotocols.c
@@ -138,9 +138,9 @@ static int execute(void)
 	efi_status_t ret;
 	efi_handle_t *buffer;
 	size_t buffer_size;
-	unsigned long int count = 0;
+	efi_uintn_t count = 0;
 	efi_guid_t **prot_buffer;
-	unsigned long int prot_count;
+	efi_uintn_t prot_count;
 
 	/*
 	 * Test HandleProtocol
diff --git a/lib/efi_selftest/efi_selftest_snp.c b/lib/efi_selftest/efi_selftest_snp.c
index bdd6ce20da6..cc0705fb59f 100644
--- a/lib/efi_selftest/efi_selftest_snp.c
+++ b/lib/efi_selftest/efi_selftest_snp.c
@@ -260,7 +260,7 @@ static int execute(void)
 {
 	efi_status_t ret;
 	struct efi_event *events[2];
-	size_t index;
+	efi_uintn_t index;
 	union {
 		struct dhcp p;
 		u8 b[PKTSIZE];
diff --git a/lib/efi_selftest/efi_selftest_tpl.c b/lib/efi_selftest/efi_selftest_tpl.c
index 15d62903c03..6ea0bb7177f 100644
--- a/lib/efi_selftest/efi_selftest_tpl.c
+++ b/lib/efi_selftest/efi_selftest_tpl.c
@@ -111,7 +111,7 @@ static int teardown(void)
  */
 static int execute(void)
 {
-	size_t index;
+	efi_uintn_t index;
 	efi_status_t ret;
 	efi_uintn_t old_tpl;