zephyr: Provide slot definitions for three images

Support for three pairs of slots.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>

boot/zephyr/include/sysflash/sysflash.h

@@ -1,45 +1,50 @@
-/* Manual version of auto-generated version. */
+/*
+ * Copyright (c) 2023 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 
 #ifndef __SYSFLASH_H__
 #define __SYSFLASH_H__
 
 #include <mcuboot_config/mcuboot_config.h>
 #include <zephyr/devicetree.h>
 #include <zephyr/storage/flash_map.h>
+#include <zephyr/sys/util_macro.h>
 
 #ifndef CONFIG_SINGLE_APPLICATION_SLOT
 
+/* Each pair of slots is separatged by , and there is no terminating character */
+#define FLASH_AREA_IMAGE_0_SLOTS slot0_partition, slot1_partition
+#define FLASH_AREA_IMAGE_1_SLOTS slot2_partition, slot3_partition
+#define FLASH_AREA_IMAGE_2_SLOTS slot4_partition, slot5_partition
+
 #if (MCUBOOT_IMAGE_NUMBER == 1)
-/*
- * NOTE: the definition below returns the same values for true/false on
- * purpose, to avoid having to mark x as non-used by all callers when
- * running in single image mode.
- */
-#define FLASH_AREA_IMAGE_PRIMARY(x) (((x) == 0) ? \
- FIXED_PARTITION_ID(slot0_partition) : \
- FIXED_PARTITION_ID(slot0_partition))
-#define FLASH_AREA_IMAGE_SECONDARY(x) (((x) == 0) ? \
- FIXED_PARTITION_ID(slot1_partition) : \
- FIXED_PARTITION_ID(slot1_partition))
+#define ALL_AVAILABLE_SLOTS FLASH_AREA_IMAGE_0_SLOTS
 #elif (MCUBOOT_IMAGE_NUMBER == 2)
-/* MCUBoot currently supports only up to 2 updateable firmware images.
- * If the number of the current image is greater than MCUBOOT_IMAGE_NUMBER - 1
- * then a dummy value will be assigned to the flash area macros.
- */
-#define FLASH_AREA_IMAGE_PRIMARY(x) (((x) == 0) ? \
- FIXED_PARTITION_ID(slot0_partition) : \
- ((x) == 1) ? \
- FIXED_PARTITION_ID(slot2_partition) : \
- 255)
-#define FLASH_AREA_IMAGE_SECONDARY(x) (((x) == 0) ? \
- FIXED_PARTITION_ID(slot1_partition) : \
- ((x) == 1) ? \
- FIXED_PARTITION_ID(slot3_partition) : \
- 255)
-#else
-#error "Image slot and flash area mapping is not defined"
+#define ALL_AVAILABLE_SLOTS \
+ FLASH_AREA_IMAGE_0_SLOTS, FLASH_AREA_IMAGE_1_SLOTS
+#elif (MCUBOOT_IMAGE_NUMBER == 3)
+#define ALL_AVAILABLE_SLOTS \
+ FLASH_AREA_IMAGE_0_SLOTS, FLASH_AREA_IMAGE_1_SLOTS
 #endif
 
+static inline uint32_t __flash_area_ids_for_slot(int img, int slot)
+{
+ static int all_slots[] = {
+ FOR_EACH_NONEMPTY_TERM(FIXED_PARTITION_ID, (,), ALL_AVAILABLE_SLOTS)
+ };
+ return all_slots[img * 2 + slot];
+};
+
+#undef FLASH_AREA_IMAGE_0_SLOTS
+#undef FLASH_AREA_IMAGE_1_SLOTS
+#undef FLASH_AREA_IMAGE_2_SLOTS
+#undef ALL_AVAILABLE_SLOTS
+
+#define FLASH_AREA_IMAGE_PRIMARY(x) __flash_area_ids_for_slot(x, 0)
+#define FLASH_AREA_IMAGE_SECONDARY(x) __flash_area_ids_for_slot(x, 1)
+
 #if !defined(CONFIG_BOOT_SWAP_USING_MOVE)
 #define FLASH_AREA_IMAGE_SCRATCH FIXED_PARTITION_ID(scratch_partition)
 #endif