fit.h

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/* Taken from depthcharge: src/boot/fit.h */
/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#ifndef __LIB_FIT_H__
#define __LIB_FIT_H__
 
#include <stddef.h>
#include <stdint.h>
#include <device_tree.h>
#include <list.h>
#include <program_loading.h>
 
struct fit_image_node {
        const char *name;
        void *data;
        uint32_t size;
        int compression;
 
        struct list_node list_node;
};
 
struct fit_config_node {
        const char *name;
        struct fit_image_node *kernel;
        struct fit_image_node *fdt;
        struct list_node overlays;
        struct fit_image_node *ramdisk;
        struct fdt_property compat;
        int compat_rank;
        int compat_pos;
        const char *compat_string;
 
        struct list_node list_node;
};
 
struct fit_overlay_chain {
        struct fit_image_node *overlay;
        struct list_node list_node;
};
 
/*
 * Updates the cmdline in the devicetree.
 */
void fit_update_chosen(struct device_tree *tree, const char *cmd_line);
 
/*
 * Add a compat string to the list of supported board ids.
 * Has to be called before fit_load().
 * The most common use-case would be to implement it on board level.
 * Strings that were added first have a higher priority on finding a match.
 */
void fit_add_compat_string(const char *str);
 
/*
 * Updates the memory section in the devicetree.
 */
void fit_update_memory(struct device_tree *tree);
 
/*
 * Do architecture specific payload placements and fixups.
 * Set entrypoint and first argument (if any).
 * @param payload The payload, to set the entry point
 * @param config The extracted FIT config
 * @param kernel out-argument where to place the kernel
 * @param fdt out-argument where to place the devicetree
 * @param initrd out-argument where to place the initrd (optional)
 * @return True if all config nodes could be placed, the corresponding
 *         regions have been updated and the entry point has been set.
 *         False on error.
 */
bool fit_payload_arch(struct prog *payload, struct fit_config_node *config,
                      struct region *kernel,
                      struct region *fdt,
                      struct region *initrd);
 
/*
 * Unpack a FIT image into memory, choosing the right configuration through the
 * compatible string set by fit_add_compat() and return the selected config
 * node.
 */
struct fit_config_node *fit_load(void *fit);
 
void fit_add_ramdisk(struct device_tree *tree, void *ramdisk_addr,
                     size_t ramdisk_size);
 
#endif /* __LIB_FIT_H__ */