#define DEVS_QUERY_MAX_INLINE 9

typedef struct devs_regcache_entry {

uint16_t role_idx;

uint16_t service_command;

uint32_t last_refresh_time;

union {

uint32_t u32;

uint8_t data[DEVS_QUERY_MAX_INLINE];

uint8_t *buffer;

} value;

uint8_t resp_size;

uint16_t argument;

} devs_regcache_entry_t;

#define DEVS_REGCACHE_NUM_ENTRIES 20

typedef struct devs_regcache {

devs_regcache_entry_t entries[DEVS_REGCACHE_NUM_ENTRIES];

uint16_t latest_idx;

} devs_regcache_t;

static inline void *devs_regcache_data(devs_regcache_entry_t *q) {

return q->resp_size > DEVS_QUERY_MAX_INLINE ? q->value.buffer : q->value.data;

}

void devs_regcache_free(devs_regcache_t *cache, devs_regcache_entry_t *q);

devs_regcache_entry_t *devs_regcache_mark_used(devs_regcache_t *cache, devs_regcache_entry_t *q);

devs_regcache_entry_t *devs_regcache_lookup(devs_regcache_t *cache, unsigned role_idx,

unsigned service_command, unsigned argument);

devs_regcache_entry_t *devs_regcache_alloc(devs_regcache_t *cache, unsigned role_idx,

unsigned service_command, unsigned resp_size);

void devs_regcache_age(devs_regcache_t *cache, unsigned role_idx, uint32_t min_time);

void devs_regcache_free_role(devs_regcache_t *cache, unsigned role_idx);

devs_regcache_entry_t *devs_regcache_next(devs_regcache_t *cache, unsigned role_idx,

unsigned service_command, devs_regcache_entry_t *prev);

void devs_regcache_free_all(devs_regcache_t *cache);