filesystem_fat.c

/*
 * Implementation of efs_ API functions for a FatFS specific
 * EpicFileSystem
 */

#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include <ff.h>
#include <diskio.h>

#include <FreeRTOS.h>
#include <semphr.h>
#include <timers.h>

#include "fs/internal.h"
#include "modules/filesystem.h"
#include "epicardium.h"
#include "card10.h"
#include "modules/log.h"
#include "modules/modules.h"
#include "api/common.h"
#include "core_cmFunc.h" //__get_IPSR()

#define SSLOG_DEBUG(...) LOG_DEBUG("fatfs", __VA_ARGS__)
#define SSLOG_INFO(...) LOG_INFO("fatfs", __VA_ARGS__)
#define SSLOG_ERR(...) LOG_ERR("fatfs", __VA_ARGS__)

#ifndef EPIC_FAT_STATIC_SEMAPHORE
#define EPIC_FAT_STATIC_SEMAPHORE 0
#endif

/* clang-format off */
#define EPIC_FAT_MAX_OPENED           (1 << (EPIC_FAT_FD_INDEX_BITS))
#define EPIC_FAT_FD_GENERATION_BITS   (31 - (EPIC_FAT_FD_INDEX_BITS))
#define EPIC_FAT_FD_INDEX_MASK        (uint32_t)((1u << EPIC_FAT_FD_INDEX_BITS) - 1)
#define EPIC_FAT_FD_INDEX(fd)         ((uint32_t)(fd)&EPIC_FAT_FD_INDEX_MASK)
#define EPIC_FAT_FD_GENERATION(fd)    ((uint32_t)(fd) >> EPIC_FAT_FD_INDEX_BITS)
#define EPIC_FAT_FD_MAX_GENERATION    (uint32_t)((1u << EPIC_FAT_FD_GENERATION_BITS) - 1)
#define EPIC_FAT_FD(idx, gen)         (int)(((uint32_t)(gen) << EPIC_FAT_FD_INDEX_BITS) \
                                      | ((uint32_t)(idx)&EPIC_FAT_FD_INDEX_MASK))
/* clang-format on */

struct FatObject {
	uint32_t generation;
	int coreMask;
	enum epic_stat_type type;
	union {
		FIL file;
		DIR dir;
	};
};

struct EpicFileSystem {
	struct FatObject pool[EPIC_FAT_MAX_OPENED];
	uint32_t generationCount;
	bool attached;
	FATFS FatFs;
	int lockCoreMask;
};

// this table converts from FRESULT to POSIX errno
static const int s_libffToErrno[20];

static const char *f_get_rc_string(FRESULT rc);